JP2001078222A - Video display device and control method thereof - Google Patents

Abstract

(57) [Problem] To provide an image display device capable of performing contour correction according to characteristics of an image, for example, a color component, a contrast difference, and a high frequency component of a frequency. SOLUTION: A video signal is separated into a luminance signal 3 and a chrominance signal 4 by a luminance / color signal separator 2, and a green detector 5 detects whether or not the color signal 4 is a green component. It is output as a control signal for controlling the operation of the contour corrector. If the detection result is a green component, the contour correction section 6 performs contour correction on the luminance signal 3, adds a color signal to the luminance signal corrected by the contour correction, and displays an image on the display section 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, a control method thereof, and a computer-readable storage medium storing a program for controlling the image display device.

[0002]

FIG. 14 shows a conventional image display apparatus 1000.
FIG. 2 is a block diagram showing a schematic configuration of the embodiment. Video display device 10
00 is a luminance / color signal separator 102 and a contour corrector 10
5 and a display unit 106. When the video signal 101 is input to the video display device 1000, the luminance / color signal separator 1
02 separates the video signal 101 into a luminance signal (Y signal) 103 and a chrominance signal (C signal) 104,
Performs contour correction on the luminance signal 103. What is contour correction?
This is a process of multiplying a contour portion having a large contour gradient of a luminance signal by a constant coefficient to enlarge a contour difference, thereby giving a sharpness to the contour. The luminance signal 103 whose contour has been corrected is the color signal 10
4 and output to the display unit 106.

FIG. 15 is a block diagram showing the configuration of the contour corrector 105. The contour corrector 105 includes a contour detection filter 107, a coring processing unit 108, and a gain processing unit 10.
9, a setting unit including a limiter 110 and an adder 114 and capable of externally setting parameters, that is, a coring setting unit 111 for setting a coring value, a gain coefficient setting unit 112 for setting a gain coefficient, and a limit value. And a limit value setting unit 113 for setting the threshold value.

The contour detection filter 107 allows the luminance signal 103 to pass through a filter for extracting the contour, and
Is detected. The coring processing unit 108 identifies a low-level component in the frequency space being output from the contour detection filter 107 and removes the low-level component. This is because the high level of the output of the contour detection filter 107 corresponds to a contour detection component, and the low level corresponds to a component containing noise. Therefore, when the low level component is contour-corrected, the noise component is emphasized and the image quality is deteriorated. Because. When the input signal is lower than the coring value set from the outside, the coring processing unit 108 outputs “0” and outputs the coring value 1
If it is higher than 11, the coring value is subtracted from the input signal and output.

[0005] The gain processing section 109 includes a coring processing section 1.
08 is multiplied by an externally set gain coefficient,
The gain of the coring processing unit 108 is controlled. The limiter 110 removes, from the gain-controlled contour component, a component that is less than an externally set limit value, and maintains a constant level of the contour component. The adder 114 adds the output of the limiter 110, that is, the contour component, to the original luminance signal. Further, a video display device capable of setting a coring value according to a noise component of an input luminance signal is disclosed in Japanese Patent Application Laid-Open No. H10-164396.

[0006]

However, the conventional technology has a problem that the control target of the contour correction is only the frequency characteristic of the image, and it is difficult to control the contour correction by the color component. That is, the parameters of the contour correction are only the coring value, the gain coefficient, and the limiter limit value for the luminance signal, and the parameters cannot be adjusted according to the color components of the video.

For example, an image containing a large amount of green components, such as a forest or a lawn, generally contains many fine patterns.
If the fine pattern component contained in the green component is not set to a low coring value, it will be determined as a noise component and will be erased, so sufficient outline correction cannot be performed, and sharp image quality correction cannot be performed. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an image capable of performing contour correction in accordance with image characteristics, for example, a color component, a contrast difference, and a high-frequency component. It is an object to provide a display device.

[0009]

According to a first aspect of the present invention, there is provided an image display apparatus for displaying an image, wherein the image signal is separated into a luminance signal and a color signal. A luminance / color signal separator, a detector for detecting a predetermined color from the color signal, an outline corrector for performing outline correction on the luminance signal, and a luminance signal corrected by the outline correction.
A display for displaying a signal obtained by adding the color signals separated by the luminance / color signal separator, wherein the detector outputs a detection result as a control signal for controlling the operation of the contour corrector. It is assumed that.

According to a second aspect of the present invention, there is provided the image display device according to the first aspect, wherein a color condition for the detector to determine whether the color signal is a predetermined color is used. And a comparator that compares whether the color signal satisfies the color condition and outputs a control signal.

According to a third aspect of the present invention, there is provided the video display device according to the second aspect, wherein the detector has a brightness condition for determining whether the brightness signal has a predetermined brightness. Further comprising a brightness condition setting device for setting
Receiving a luminance signal, comparing whether the luminance signal satisfies the luminance condition, and outputting a comparison result under the color condition and a comparison result under the luminance condition as the control signal.

According to a fourth aspect of the present invention, there is provided the image display apparatus according to the third aspect, further comprising extracting a high-frequency component of the luminance signal, and extracting the extracted high-frequency component to a predetermined component. And a control signal output unit that outputs a result of the comparator and a result of the extractor as a control signal for controlling the operation of the contour corrector. It is.

A video display device according to a fifth aspect is the video display device according to any one of the first to fourth aspects, wherein the control signal is a signal for instructing on / off of the operation of the contour corrector. When the detector outputs a signal indicating OFF, the contour corrector stops contour correction of the luminance signal, and the display unit outputs the luminance signal and the color signal separated by the luminance / color signal separator. It is characterized by combining and displaying.

According to a sixth aspect of the present invention, there is provided an image display apparatus according to any one of the first to fourth aspects, wherein the control signal is a coring value of the contour corrector, a gain coefficient, and a limit value. Used as a signal instructing switching of a setting value for at least one of the values, wherein the contour corrector has at least two setting values for at least one of a coring value, a gain coefficient, and a limit value; The setting value is switched in accordance with a switching instruction signal.

A video display device according to a seventh aspect is the video display device according to any one of the first to sixth aspects, wherein the predetermined color includes at least one of red, blue, and green. It is characterized by the following.

According to a eighth aspect of the present invention, there is provided a method for controlling an image display device for displaying an image, comprising the steps of:
The video signal is separated into a luminance signal and a color signal, a predetermined color is detected from the color signal, the detected result is output as a control signal, and the luminance signal is contour-corrected based on the control signal. Displaying a signal obtained by adding the separated color signal to the corrected luminance signal.

According to a ninth aspect of the present invention, in the control method of the video display apparatus according to the eighth aspect, the detecting step determines whether or not the color signal is a predetermined color. And setting whether color signals satisfy the color conditions or not.

According to a tenth aspect of the present invention, in the control method of the ninth aspect, the detecting step determines whether or not the luminance signal has a predetermined luminance. Setting a luminance condition for determination, comparing whether the luminance signal satisfies the luminance condition, and outputting a comparison result based on the color condition and a comparison result based on the luminance condition as a control signal;
It is characterized by the following.

[0019] A control method for a video display device according to claim 11 is the control method for a video display device according to claim 10, further comprising extracting a high-frequency component of a luminance signal, and extracting the extracted high-frequency component. Comparing whether the band component is a predetermined component, and outputting a comparison result based on the high band component, a comparison result based on the color condition, and a comparison result based on the luminance condition as a control signal. Things.

According to a twelfth aspect of the present invention, there is provided a method for controlling an image display device according to any one of the eighth to eleventh aspects, wherein the control signal comprises an on / off operation of an outline correction operation. It is used as a signal for instructing off, and when a signal for instructing off is output, contour correction of the luminance signal is stopped, and the separated luminance signal and color signal are combined and displayed. It is.

According to a thirteenth aspect of the present invention, there is provided the video display device control method according to any one of the eighth to eleventh aspects, wherein the control signal is a contouring coring value, Used as a signal instructing switching of a set value for at least one of a gain coefficient and a limit value;
The contour correction step is characterized in that a set value is switched to at least one of a coring value, a gain coefficient, and a limit value according to a signal instructing switching.

According to a fourteenth aspect of the present invention, there is provided a method of controlling a video display device according to any one of the eighth to thirteenth aspects, wherein the predetermined colors are red, blue, and green. It is characterized by including at least one.

A storage medium according to a fifteenth aspect is a computer readable storage medium storing a program for controlling an image display device for displaying an image, wherein the image signal is separated into a luminance signal and a color signal, , A predetermined color is detected, a detected result is output as a control signal, an outline correction is performed on the luminance signal based on the control signal, and the separated color signal is added to the luminance signal corrected by the outline correction. A storage medium storing a program for displaying a signal and executing a process.

A storage medium according to a sixteenth aspect is the storage medium according to the fifteenth aspect, wherein the detecting step sets a condition for determining whether the color signal is a predetermined color. And whether the color signal satisfies the condition set by the color condition setting device.

A storage medium according to a seventeenth aspect is the storage medium according to the sixteenth aspect, wherein the detecting step sets a luminance condition for determining whether or not the luminance signal has a predetermined luminance. Then, a comparison is made as to whether or not the luminance signal satisfies the luminance condition, and a comparison result under the color condition and a comparison result under the luminance condition are output as control signals.

The storage medium according to claim 18 is the storage medium according to claim 17, further comprising extracting a high-frequency component of the luminance signal, and the extracted high-frequency component is a predetermined component. A program for executing a step of comparing whether or not a comparison result based on a high-frequency component, a comparison result based on a color condition, and a comparison result based on the luminance condition as the control signal. It is.

The storage medium according to claim 19 is the storage medium according to any one of claims 15 to 18,
The control signal is used as a signal for instructing ON / OFF of the contour correction operation, and when the storage medium further outputs a signal for instructing OFF, contour correction of the luminance signal is stopped,
The program has a program for executing a process of combining and displaying the separated luminance signal and color signal.

A storage medium according to a twentieth aspect is the storage medium according to any one of the fifteenth to eighteenth aspects,
The control signal is used as a signal for instructing switching of a set value for at least one of a coring value, a gain coefficient, and a limit value of contour correction, and the contour correcting step performs coring in accordance with the signal for instructing switching. The setting value is switched to at least one of a value, a gain coefficient, and a limit value.

A storage medium according to claim 21 is the storage medium according to any one of claims 15 to 20,
The predetermined color includes at least one of red, blue, and green.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a video display device according to an embodiment of the present invention will be described with reference to the drawings. Embodiment 1 FIG. FIG. 1 is a block diagram showing a schematic configuration of a video display device 100 according to the first embodiment. An example of the video display device is a television receiver.
The video display device 100 includes a luminance / color signal separator 2 that separates the video signal 1 into a luminance signal (Y signal) 3 and a color signal (C signal) 4, and a color separated by the luminance / color signal separator 2. A color detector for detecting a predetermined color from the signal 4, for example, a green detector 5 for detecting green, and a detection result received by the green detector 5 as a control signal, and the luminance separated by the luminance / color signal separator 2 A contour corrector 6 for performing contour correction on the signal 3, a display 7 for displaying a signal obtained by adding the color signal 4 separated by the luminance / color signal separator 2 to the luminance signal corrected by the contour corrector 6. , Is provided.

FIG. 2 is a block diagram showing the structure of the green detector 5. The green detector 5 includes a green condition setting unit 21 and a green detection comparator 22.

In the green condition setting unit 21, conditions for judging whether or not the component of the color signal 4 belongs to green are set in advance from the outside. The condition of belonging to green is 2
It is determined from the types of color difference signals. That is, the condition of the green component is obtained from one of the color difference signals, the condition of the green component is also obtained from the other color difference signal, and the condition that satisfies both conditions is the green condition setting unit
Set to 1.

The green detection comparator 22 compares whether or not the input color signal satisfies the condition set by the green condition setting device 21, and uses the comparison result as a control signal for the contour correction operation of the contour corrector 6. Output. For example, when the comparison result satisfies the condition, that is, when the input signal is green, for example, “1” is output to the contour corrector 6 as a control signal. On the other hand, when the comparison result does not satisfy the condition, that is, when the input signal is a color other than green, for example, “0” is output to the contour corrector 6 as a control signal. The detection of the green component is performed for each pixel to which the color signal is sent.

The contour corrector 6 has a structure for stopping the contour correction of the luminance signal when the comparison result by the green detection comparator 22 is not suitable for the contour correction, or a coring value, a gain coefficient, and a limit value. A configuration capable of switching the set value for at least one of the above.

FIG. 3 is a block diagram showing a configuration of a contour corrector 6A having a configuration for stopping contour correction of a luminance signal. The configuration as shown in FIG. 3 is suitable when the externally set coring value is low. The same components as those in FIG. 15 are denoted by the same reference numerals. In addition, the description of the configuration of the same reference numeral is the same as the description of FIG. 15, and the description is omitted here.

The contour corrector 6A includes a contour detection filter 10
7, a coring processing unit 35, a gain processing unit 109, a limiter 110, a coring value setting unit 30, a gain coefficient setting unit 112, and a limit value setting unit 113. The coring value setting unit 30 includes a switch 31 and a storage unit 32. The storage unit 32 stores a low-level coring value set by external setting. The low-level coring value is a value that enables contour correction even to a fine component of a green image.

When the switch 31 receives the control signal from the green detection comparator 22 and indicates that the input color signal is a green component, the switch 31 is connected to the storage unit 32 and has a component other than green. In this case, the switch 31 is connected to the coring processing unit 35 side. Upon receiving the signal via the switch 31, the storage unit 32 outputs an externally set coring value. The coring processing unit 35 includes the storage unit 3
When the coring value is received from 2, the coring process is performed, and when the control signal is received via the switch 31, the processes after the coring process are stopped. In the contour corrector 6A having the above-described configuration, the control signal is a control signal for instructing ON / OFF of the contour correcting operation of the contour corrector 6A.

FIG. 4 is a flowchart showing the processing flow of the coring setting section 30 and the coring processing section 35. In addition, in order to simplify the description, the green detection comparator 22
It is assumed that when the input signal is determined to be green, “1” is output as the control signal, and when the input signal is determined to be a color other than green, “0” is output as the control signal.

In step S1, whether the control signal is "1" or "0", that is, whether the input color signal indicates a green component,
It is determined whether a color component other than green is shown. Step S1
And the control signal is determined to be "1" (YE
S), the process proceeds to step S2, and the switch 31 is
Connect to side 2. Subsequently, the process proceeds to step S3, and the coring value set externally is output from the storage unit 32 to the coring processing unit 35. In step S4, the coring processing unit 35 performs a coring process using a coring value set externally. The signal that has been subjected to the coring processing is input to an adder 114 through processing by a gain processing unit 109 and a limiter 110, is added to the original luminance signal, and is output to a display unit.

On the other hand, in step S1, the control signal is "0".
If it is determined (NO), the process proceeds to step S10, the switch 31 is connected to the coring processing unit 35, and the output “0” from the green detection comparator 22 is input to the coring processing unit 35. . Next, proceed to step S11.
The processing after the coring processing unit 35 is stopped. When the contour correction is stopped, the adder 114 outputs the original luminance signal as it is. According to the configuration and processing described above, fine contour correction can be performed on a green image portion, and the contour correction process is turned off in an image portion other than green, so that amplification of a noise component can be avoided.

FIG. 5 shows a contour corrector 6B capable of switching the coring value to a parameter suitable for the green detection result.
FIG. 3 is a block diagram showing the configuration of FIG. The contour corrector 6B as shown in FIG. 5 is suitable when the externally set coring value is at a high level. The same components as those in FIG. 15 are denoted by the same reference numerals. Note that the description of the configuration of the same reference numerals as in FIG. 15 is the same as the description of FIG. 15, and the description is omitted here.

The contour corrector 6B includes a contour detection filter 10
7, a coring processing unit 45, a gain processing unit 109, a limiter 110, a coring value setting unit 40, a gain coefficient setting unit 112, and a limit value setting unit 113. The coring value setting unit 40 includes a low-level storage unit 41, a high-level storage unit 42, and a switch 43. The low-level storage unit 41 stores a low-level coring value set by external setting. The low-level coring value is a value that enables contour correction even to a fine component of a green image.
The high-level storage unit 42 stores a high-level coring value set by external setting. The high level coring value is a value that can perform contour correction without expanding the noise component.

The switch 43 receives the control signal from the green detection comparator 22, and when the input color signal indicates a green component,
The switch 43 is connected to the low-level storage unit 41 on the side,
When a component other than green is indicated, the switch 43 is connected to the high-level coring storage unit 42 side. Low level storage unit 4
1 and the high-level storage unit 42 are respectively
When the signal is received from 1, the stored coring value is output to the coring processing unit 45. Coring processor 4
5 performs a coring process according to the received coring value. In the contour corrector 6B configured as described above, the control signal is a control signal for switching the set value of the coring value of the contour corrector 6B.

FIG. 6 is a flowchart showing the processing flow of the coring setting section 40 and the coring processing section 45. In addition, in order to simplify the description, the green detection comparator 22
It is assumed that when the input signal is determined to be green, “1” is output as the control signal, and when the input signal is determined to be a color other than green, “0” is output as the control signal.

In step S60, whether the control signal is "1" or "0", that is, whether the input color signal indicates a green component,
It is determined whether a color component other than green is shown. Step S60
And the control signal is determined to be "1" (YE
S), the process proceeds to step S61, and the switch 43 is connected to the low-level storage unit 41 side. Subsequently, step S62
Then, the externally set low-level coring value is output from the low-level storage unit 41 to the coring processing unit 45.

On the other hand, if it is determined in step S60 that the control signal is "0" (NO), step S7
The switch 43 is connected to the high-level storage unit 42 side. Subsequently, the process proceeds to step S71, and the externally set high-level coring value is output from the high-level storage unit 42 to the coring processing unit 45. When a low-level or high-level coring value is output, step S65 is performed.
Then, the coring processing unit 45 performs a coring process based on the received coring value. The signal subjected to the coring processing is input to the adder 114 through processing by the gain processing unit 109 and the limiter 110, is added to the original luminance signal, and is output.

The control signal is a signal for instructing switching of a set value for at least one of a coring value, a gain coefficient, and a limit value of the contour corrector. Although the video display device capable of switching the setting of the ring value has been described, the coring value,
With respect to at least one of the gain coefficient and the limit value, it is also possible to adopt a configuration having two set values and switching the set values according to the control signal output from the green detection comparator 22. According to the configuration and processing described above, fine contour correction can be performed on a green image portion, and contour correction without expanding amplification of noise components can be performed on an image portion other than green.

As described above, according to the first embodiment, appropriate contour correction can be performed on a green component image. FIG. 7 is a diagram illustrating an example of an image on which contour correction is performed according to the first embodiment. As shown in FIG. 7, in the case of an image including a green component 49 and a non-green component 48, the green detector 5 outputs “1” for the green component 49 and outputs a “1” for the non-green component 48. Outputs “0”. The contour corrector 6 can perform a coring process on a portion corresponding to “1” using a low-level coring value to perform fine contour correction. In addition, the part corresponding to "0"
It is possible to perform processing for preventing the noise from expanding.

Embodiment 2 FIG. 8 is a block diagram showing a schematic configuration of a video display device 200 according to the second embodiment. The same components as those in FIG. 1 are denoted by the same reference numerals. The description of the configuration of the same reference numerals as in FIG.
This is the same as the description of FIG. 1, and the description is omitted here.

Video display device 200 according to Embodiment 2
Is a luminance / color signal separator 2, a luminance / green detector 50 that receives a luminance signal and a color signal as input signals, a contour corrector 6,
And a display unit 7.

FIG. 9 is a block diagram showing the structure of the luminance / green detector 50. The luminance / green detector 50 includes a luminance condition setting device 51, a green condition setting device 21, and a luminance / green detection comparator 52.

In the luminance condition setting unit 51, the condition of the luminance signal is set from the outside. As described above, the condition for determining whether or not a pixel belongs to the green component is externally set in the green condition setting unit 21. The conditions to be set are determined from the two color difference signals as in the first embodiment.

The luminance / green detection comparator 52 compares the input luminance signal with the condition of the luminance condition setting device 51, compares the input color signal with the condition of the green condition setting device 21, and compares the comparison result. It is output as a control signal for the contour corrector 6. For example,
If both conditions are satisfied, that is, if the input signal is a green signal having a specific luminance, “1” is output as the control signal. If at least one of the above conditions is not satisfied, “0” is output as the control signal. Is output. Note that the comparison between the luminance and the green component is performed on a pixel basis of the luminance signal and the color signal.

The contour corrector 6 includes a luminance / green detection comparator 52
The configuration is the same as that of the first embodiment except that the control signal output from is input to the coring value setting unit 30 in FIG. 3 or the coring value setting unit 40 in FIG. That is,
When the coring value set externally is low, the contour corrector 6 has the configuration of the contour corrector 6A illustrated in FIG.
In the case of a high level, the configuration of the contour corrector 6B illustrated in FIG. 5 is provided.

In the second embodiment, the video display device capable of switching the setting of the coring value has been described. However, at least one of the coring value, the gain coefficient, and the limit value has at least two set values. Has,
It is also possible to adopt a configuration in which the set value is switched according to the control signal output from the luminance / green detection comparator 52.

As described above, if the image display device of the second embodiment is used, the contrast can be added to the control conditions of the contour corrector 6, so that the contour can be effectively corrected to an appropriate portion. Can be. This is particularly effective when the brightness level is low and the effect of the contour correction is hard to appear visually. FIG. 10 is a diagram illustrating an image on which contour correction is performed according to the second embodiment. As shown in FIG. 10, in the case of an image including a dark green component 58, a bright green component 59, and a component 57 other than green, the luminance / green detector 50 determines “ 1 is output, and “0” is output for the bright green component 59 and the non-green component 57. The contour corrector 6 includes, in a portion corresponding to “1”,
Coring processing can be performed using a low-level coring value to perform fine contour correction. Also, "0"
Can be processed to prevent the noise from expanding.

Embodiment 3 FIG. 11 is a block diagram showing a schematic configuration of a video display device 300 according to the third embodiment. 1 and 8 are assigned the same reference numerals. Further, the description of the configuration of the same reference numeral is the same as the description of FIGS. 1 and 8, and the description is omitted here.

Video display device 300 according to Embodiment 3
Is a luminance / color signal separator 2, a high-frequency component extractor 71,
The control signal output unit AND outputs a result from the luminance / green detector 50, the high-frequency component extractor 71, and the luminance / green detector 50 as a control signal for controlling the operation of the contour corrector 6.
It includes a circuit 72, a contour corrector 6, and a display unit 7.

FIG. 12 is a block diagram showing the structure of the high-frequency component extractor 71. The high-frequency component extractor 71 includes a contour extraction band-pass filter (hereinafter, referred to as a luminance signal) as an input signal.
(BPS) 82, a BPF output condition setting unit 81, and a BPF output comparator 83.

The condition of the BPF output comparator 83 is externally set in the BPF output condition setting device 81. The condition to be set is preferably set to a low level so that a noise component can be extracted. The contour extraction BPF 82 performs a filtering process on the input luminance signal.

The BPF output comparator 83 has a contour extraction BPF
The output of 82 is compared with the condition set in the BPF output condition setting unit 81, and the comparison result is output as a BPF signal.
If the condition is satisfied, for example, “1” is output as the BPF signal, and if the condition is not satisfied, for example, “0” is output as the BPF signal. The BPF signal is output from the high-frequency component extractor 71.
Output.

The luminance / green detector 50 detects whether the luminance signal and the chrominance signal satisfy the conditions as described in the second embodiment. The AND circuit 72 includes a high-frequency component extractor 71
AND with the luminance / green detector 50. The output of the AND circuit 72 has information indicating that the input video signal is a high-frequency component, belongs to a specific luminance level, and is a green component, and serves as a control signal for the contour corrector 6. In addition,
The control signal output unit is not limited to the AND circuit 72.

The contour corrector 6 is different from that of the first embodiment except that the control signal output from the AND circuit 72 is input to the coring value setting unit 30 in FIG. 3 and the coring value setting unit 40 in FIG. It has a similar configuration. That is, the contour corrector 6
When the coring value of the external setting is low, the configuration 6A illustrated in FIG. 3 is provided, and when the coring value is high, the configuration 6B illustrated in FIG. 5 is provided.

In the third embodiment, the video display device capable of switching the setting of the coring value has been described. However, at least one of the coring value, the gain coefficient, and the limit value has at least two set values. Has,
It is also possible to adopt a configuration in which the set value is switched according to the control signal output from the control signal output unit.

As described above, if the image display apparatus of the third embodiment is used, the difference in brightness and the high-frequency component of the luminance signal can be added to the condition of the contour correction. It can be done effectively. FIG. 13 is a diagram illustrating an image on which contour correction is performed according to the third embodiment. As shown in FIG. 13, the high-frequency component extractor 71
The high-frequency component 91 is extracted from 0 and “1” is output, and the luminance /
The green detector 50 extracts a green component 92 having a specific luminance from the image 90 and outputs “1”, and the AND circuit 72 outputs a high-frequency component extractor 71 and a luminance / green detector 50 for each pixel. And outputs “1” for the green component 93 that is a high-frequency component and has a specific luminance. The contour corrector 6 can perform a coring process on a portion corresponding to the output “1” of the AND circuit 72 using a low-level coring value to perform fine contour correction. Also,
The portion corresponding to “0” can be subjected to processing for preventing noise from expanding.

In the description of the first to third embodiments,
For the sake of simplicity, the outline correction has been described focusing on the green component, but it goes without saying that the outline can be corrected for other colors, for example, red and blue components. Further, those skilled in the art can easily achieve further improvement of the video display device of the present embodiment to a configuration capable of correcting the outline of each of a plurality of color components (for example, three primary colors). Further, the present invention can be applied to not only a digital video signal but also an analog video signal.

Other Embodiments It is needless to say that the present invention can be achieved by supplying a storage medium storing a program code of software for realizing the first to third embodiments to a system or an apparatus. Therefore, a storage medium storing the above-mentioned program constitutes the present invention. The present invention also constitutes a case where the system or the apparatus can read the storage medium storing the above program into the system or the apparatus so as to be able to enjoy the effects of the method of the present invention.

[0068]

As described above, the video display device according to the present invention is a video display device for displaying video, wherein a luminance / color signal separator for separating a video signal into a luminance signal and a chrominance signal is provided.
A detector for detecting a predetermined color from the color signal, an outline corrector for performing outline correction on the luminance signal, and adding the color signal separated by the luminance / color signal separator to the luminance signal corrected by the outline correction. A display for displaying the detected signal, wherein the detector outputs a detection result as a control signal for controlling the operation of the contour corrector.

Further, according to the control method of the video display device according to the present invention, in the control method of the video display device for displaying a video, the video signal is separated into a luminance signal and a color signal, and a predetermined color is detected from the color signal. Outputting the detected result as a control signal, performing contour correction on the luminance signal based on the control signal, and displaying a signal obtained by adding the separated color signal to the luminance signal corrected by the contour correction. It is characterized by having.

A storage medium according to the present invention is a computer-readable storage medium storing a program for controlling a video display device for displaying a video, wherein the storage medium separates a video signal into a luminance signal and a color signal, and Detects a given color from
Outputting the detected result as a control signal, performing contour correction on the luminance signal based on the control signal, and displaying a signal obtained by adding the separated color signal to the luminance signal corrected by the contour correction. This is a storage medium storing a program to be executed.

According to the present invention, it is possible to effectively perform contour correction on an appropriate portion without amplifying a noise component according to characteristics of an image, for example, a color component, a luminance, and a high-frequency component. .

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a video display device 100 according to a first embodiment.

FIG. 2 is a block diagram showing a configuration of a green detector 5;

FIG. 3 is a block diagram showing a configuration of a contour corrector 6A.

FIG. 4 is a coring setting section 30 and a coring processing section 3;
12 is a flowchart showing the flow of the process of FIG.

FIG. 5 is a block diagram showing another configuration of the contour corrector 6B.

FIG. 6 shows a coring setting unit 40 and a coring processing unit 4
12 is a flowchart showing the flow of the process of FIG.

FIG. 7 is a diagram illustrating an image on which contour correction is performed according to the first embodiment;

FIG. 8 is a block diagram showing a schematic configuration of a video display device 200 according to a second embodiment.

FIG. 9 is a block diagram showing a configuration of a luminance / green detector 50.

FIG. 10 is a diagram illustrating an image on which contour correction is performed according to a second embodiment;

FIG. 11 is a block diagram illustrating a schematic configuration of a video display device 300 according to a third embodiment.

FIG. 12 is a block diagram showing a configuration of a high-frequency component extractor 71.

FIG. 13 is a diagram illustrating an image on which contour correction is performed according to a third embodiment;

FIG. 14 is a block diagram showing a configuration of a conventional video display device 1000.

FIG. 15 is a block diagram showing a configuration of a conventional contour corrector 105.

[Explanation of symbols]

Reference Signs List 1 video signal 2 luminance / color signal separator 3 luminance signal 4 color signal 5 green detector 6, 6A, 6B contour corrector 7 display unit 21 green condition setting unit 22 green detection comparator 30 coring value setting unit 31 switch 32 Storage unit 35 Coring processing unit 40 Coring value setting unit 41 Low level storage unit 42 High level storage unit 43 Switch 45 Coring processing unit 48 0 output part of green detection comparator 49 1 output part of green detection comparator Reference Signs List 50 luminance / green detector 51 luminance condition setting device 52 luminance / green detection comparator 53 luminance / green detection comparator output 57 0 output part by green judgment in luminance / green detection comparator 58 luminance / green detection comparator 1 output part 59 0 output part based on luminance judgment by luminance / green detection comparator 71 high frequency component extractor 72 AND gate 73 high frequency component extractor output 81 BPF output condition Item setting unit 82 Contour extraction BPF 83 BPF output comparator 90 Image 91 High frequency component extractor output 92 Luminance / green signal detector output 93 High frequency component extractor + luminance / green detector output 101 Video signal input 102 Luminance / color Signal separator 103 Luminance signal 104 Color signal 105 Contour corrector 106 Display unit 107 Contour detection filter 108 Coring processing unit 109 Gain processing unit 110 Limiter 111 Coring value setting unit 112 Gain coefficient setting unit 113 Limit value setting unit 114 Adder Reference Signs List 100 Video display device according to first embodiment 200 Video display device according to second embodiment 300 Video display device according to third embodiment 1000 Conventional video display device

Continued on the front page F term (reference) 5C021 PA12 PA17 PA35 PA53 PA58 PA66 RA02 RA06 RB03 RB09 SA11 XB03 ZA02 5C066 AA03 AA11 CA06 CA17 DC01 DC06 EA03 EA11 EC02 EE02 GA02 GA04 GA05 GA11 GA33 GB01 JA01 KA01 KA08 KA06

Claims (21)

[Claims] 1. An image display device for displaying an image, comprising: a luminance / color signal separator for separating an image signal into a luminance signal and a color signal; a detector for detecting a predetermined color from the color signal; A contour corrector that performs contour correction on the signal, and a display that displays a signal obtained by adding the color signal separated by the luminance / color signal separator to the luminance signal corrected by the contour correction, The image display device, wherein the detector outputs a detection result as a control signal for controlling an operation of the contour corrector. 2. The image display device according to claim 1, wherein the detector sets a color condition for determining whether the color signal is the predetermined color. And a comparator for comparing whether or not the color signal satisfies the color condition and outputting the control signal. 3. The image display device according to claim 2, wherein the detector is a luminance condition setting device that sets a luminance condition for determining whether the luminance signal has a predetermined luminance. Furthermore, the comparator receives the luminance signal, compares whether the luminance signal satisfies the luminance condition, and uses the comparison result under the color condition and the comparison result under the luminance condition as the control signal. An image display device for outputting. 4. The video display device according to claim 3, further comprising: extracting a high-frequency component of the luminance signal, and comparing whether the extracted high-frequency component is a predetermined component. An image display device comprising: an extractor; and a control signal output unit that outputs a result of the comparator and a result of the extractor as a control signal for controlling an operation of the contour corrector. 5. The image display device according to claim 1, wherein the control signal is used as a signal for instructing on / off of an operation of the contour corrector, and the detector is When the signal for instructing turning off is output, the contour corrector stops contour correction of the luminance signal, and the display unit combines the luminance signal and the color signal separated by the luminance / color signal separator. A video display device for displaying. 6. The image display device according to claim 1, wherein the control signal is a signal corresponding to at least one of a coring value, a gain coefficient, and a limit value of the contour corrector. The contour corrector has at least two set values for at least one of the coring value, the gain coefficient, and the limit value, and is a signal indicating the change. A video display device, wherein the setting value is switched according to the following. 7. The image display device according to claim 1, wherein the predetermined color includes at least one of red, blue, and green. 8. A method for controlling an image display device for displaying an image, comprising: separating an image signal into a luminance signal and a color signal; detecting a predetermined color from the color signal; and using the detected result as a control signal. Output, performing contour correction on the luminance signal based on the control signal, and displaying a signal obtained by adding the separated color signal to the luminance signal corrected by the contour correction. Control method for a video display device. 9. The method for controlling a video display device according to claim 8, wherein the detecting step sets a color condition for determining whether the color signal is the predetermined color, A method for controlling a video display device, comprising: comparing whether the color signal satisfies the color condition. 10. The control method for a video display device according to claim 9, wherein the detecting step sets a luminance condition for determining whether the luminance signal has a predetermined luminance. A method of controlling a video display device, comprising: comparing whether a luminance signal satisfies the luminance condition, and outputting a comparison result under the color condition and a comparison result under the luminance condition as the control signal. 11. The method according to claim 10, further comprising extracting a high-frequency component of the luminance signal, and determining whether the extracted high-frequency component is a predetermined component. And outputting the comparison result based on the high frequency component, the comparison result based on the color condition, and the comparison result based on the luminance condition as the control signal. 12. The control method for a video display device according to claim 8, wherein the control signal is used as a signal for instructing on / off of the contour correction operation. A contour signal of the luminance signal is stopped, and the separated luminance signal and color signal are combined and displayed. 13. The control method for an image display device according to claim 8, wherein the control signal includes at least one of a coring value, a gain coefficient, and a limit value of the contour correction. The contour correction step switches the set value to at least one of the coring value, the gain coefficient, and the limit value according to the signal indicating the switch. And a control method for a video display device. 14. The image display device control method according to claim 8, wherein the predetermined color includes at least one of red, blue, and green. How to control the device. 15. A computer-readable storage medium storing a program for controlling an image display device for displaying an image, wherein the image signal is separated into a luminance signal and a color signal, and a predetermined color is detected from the color signal. The detected result is output as a control signal, an outline correction is performed on the luminance signal based on the control signal, and a signal obtained by adding the separated color signal to the luminance signal corrected by the outline correction is displayed. A storage medium storing a program for executing a process. 16. The storage medium according to claim 15, wherein in the detecting step, a color condition for determining whether the color signal is the predetermined color is set, and the color signal is A storage medium for comparing whether or not the color condition is satisfied. 17. The storage medium according to claim 16, wherein said detecting step sets a luminance condition for judging whether said luminance signal has a predetermined luminance, and A storage medium that compares whether or not a luminance condition is satisfied, and outputs a comparison result under the color condition and a comparison result under the luminance condition as the control signal. 18. The storage medium according to claim 17, further comprising: extracting a high-frequency component of the luminance signal; comparing whether the extracted high-frequency component is a predetermined component; A storage medium having a program for executing a step of outputting, as the control signal, a comparison result based on the high frequency component, a comparison result based on the color condition, and a comparison result based on the luminance condition. 19. The storage medium according to claim 15, wherein the control signal is used as a signal for instructing on / off of the contour correction operation, and the storage medium further comprises: A program for executing a step of stopping contour correction of the luminance signal when the signal instructing turning off is output and combining and displaying the separated luminance signal and color signal. Storage media. 20. The storage medium according to claim 15, wherein the control signal is a set value for at least one of a coring value, a gain coefficient, and a limit value of the contour correction. Wherein the contour correction step switches a set value for at least one of the coring value, the gain coefficient, and the limit value according to the signal indicating the switching. Storage medium. 21. The storage medium according to claim 15, wherein the predetermined color includes at least one of red, blue, and green.