CN101620816A - Method and system for evaluating stereoscopic image display panel - Google Patents
Method and system for evaluating stereoscopic image display panel Download PDFInfo
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Abstract
The invention relates to a method and a system for evaluating a stereoscopic image display panel. The method comprises the following steps: firstly, displaying a diction frame on the stereoscopic image display panel, wherein a display surface of the stereoscopic image display panel is provided with a first normal vector; secondly, sensing the brightness of the detection frame by an image sensing device, wherein a sensing surface of the image sensing device is provided with a second normal vector, and an angle is formed between the first normal vector and the second normal vector; thirdly, sensing the brightness of the detection frame under different angles, wherein when the first angle is formed between the first normal vector and the second normal vector, the image sensing device can sense the highest brightness of the detection frame; analyzing the brightness uniformity of the detection frame at the first angle; and measuring the optimal visual distance and calculating the mutual interference degree. The method and the system are beneficial to evaluating the display quality of the stereoscopic image display panel in a quantification mode.
Description
Technical Field
The present invention relates to a method and a system for evaluating a display panel, and more particularly, to a method and a system for evaluating a stereoscopic display panel.
Background
According to the visual characteristics of human eyes, when the left and right eyes respectively watch two images with the same image content but different parallaxes, a stereoscopic image is formed. Therefore, the mechanism of the stereoscopic image display technology is to display two images with different parallax viewed by the left eye and the right eye respectively according to the visual characteristics of the human eyes, so as to form a stereoscopic image.
Generally, a method for evaluating a flat display panel is to use an image capturing device to be close to a display surface of the flat display panel, capture a picture of a certain area on the flat display panel, and evaluate the display quality of the entire flat display panel according to the display quality of the area. However, the stereoscopic display panel and the viewer must have a fixed distance range, and the displayed picture is a stereoscopic picture. Therefore, the method of evaluating the flat panel display is not suitable for evaluating the stereoscopic image display panel.
In the prior art, the manner of evaluating the stereoscopic display panel is usually to determine the display quality of the stereoscopic display panel by observing with naked eyes. However, this method easily affects the result of the judgment due to fatigue of the person, and lacks a judgment criterion for consistency. Therefore, it is necessary to provide a quantitative evaluation data to evaluate the display quality of the stereoscopic display panel.
Disclosure of Invention
An object of the present invention is to provide a method and system for evaluating a stereoscopic image display panel, which is advantageous for evaluating display quality of the stereoscopic image display panel in a quantitative manner.
The invention provides a method for evaluating a stereoscopic image display panel, which comprises the following steps: first, a detection picture is displayed on a stereoscopic image display panel, wherein the display surface of the stereoscopic image display panel has a first normal vector. Then, the brightness of the detected picture is sensed by an image sensing device, wherein a sensing surface of the image sensing device is provided with a second normal vector, and an angle is formed between the second normal vector and the first normal vector. Then, the brightness of the detected picture is sensed under different angles, wherein when the second normal vector and the first normal vector have the first angle, the image sensing device senses the highest brightness of the detected picture. Then, the luminance uniformity of the detected frame is analyzed at the first angle. And then measuring a visible distance of the stereoscopic image display panel. Then, the mutual interference degree between the frames displayed by the stereoscopic image display panel is calculated.
In an embodiment of the invention, the detection frame includes a left-eye frame and a right-eye frame.
In an embodiment of the present invention, a method of obtaining a first angle comprises the steps of: first, a right-eye image is displayed, and the brightness of the right-eye image is sensed at different angles. Then, the left-eye image is displayed, and the brightness of the left-eye image is sensed under different angles. Then, the brightness of the right-eye image and the left-eye image under different angles are compared to obtain the angle corresponding to the highest brightness, and the angle is defined as a first angle.
In an embodiment of the present invention, a method for analyzing luminance uniformity of a detected frame includes the following steps: first, an X-axis located at the center of the inspection screen is selected. Then, the luminance of each point on the X-axis is sensed to obtain a luminance distribution curve drawn by each point on the X-axis relative to the luminance. Then, the luminance uniformity of the detection picture is judged by using the obtained luminance distribution curve.
In an embodiment of the present invention, the following mathematical formula (1) is further utilized to obtain the visible distance. Wherein, thetakRepresents an optimal viewing angle, E represents a distance between both eyes of a viewer, and d represents a viewing distance.
In an embodiment of the present invention, the visible distance is in a range of (0.3-8) meters.
In an embodiment of the present invention, the following formula (2) is further utilized to define the degree of mutual interference (crosstalk) between the left-eye frame and the right-eye frame. Wherein R isminRepresents the minimum luminance, L, of the right-eye pictureminRepresents the minimum luminance of the left-eye picture; l ismaxRepresents the maximum luminance of the left-eye picture, RmaxIndicating the maximum luminance of the right-eye picture.
The invention also provides a system for evaluating the stereoscopic image display panel, which comprises a rotating platform, an image sensing device and a control and analysis device. The rotating platform is provided with a stereo image display panel on the rotating platform, wherein the stereo image display panel displays a detection picture, and the display surface of the stereo image display panel is provided with a first normal vector. The image sensing device is arranged in front of the stereoscopic image display panel to sense the brightness of the detected picture, wherein the sensing surface of the image sensing device is provided with a second normal vector, and an angle is formed between the second normal vector and the first normal vector. The control and analysis device is respectively connected with the rotating platform and the image sensing device so as to control the rotating platform to rotate to different angles, control the image sensing device to sense the brightness of the detected picture at different angles, and convert the obtained brightness into a plurality of data to be stored.
In an embodiment of the invention, the system for evaluating a stereoscopic display panel further includes a moving platform disposed in front of the rotating platform, wherein the moving platform moves along a first direction approaching to the rotating platform or a second direction departing from the rotating platform, and the image sensing device is disposed on the moving platform.
In an embodiment of the present invention, the image sensing device includes a lens and an image sensing element. The lens has a focusing function and is aligned to the stereoscopic image display panel. In addition, the image sensing assembly is connected with the lens and senses the brightness of a detection picture displayed by the stereoscopic image display panel.
In an embodiment of the present invention, the image sensor is a Charge Coupled Device (CCD).
In an embodiment of the present invention, the control and analysis device includes a control and analysis host and a control screen. The control analysis host is electrically connected with the three-dimensional image display panel and the image sensing device. In addition, the control screen is connected with the control analysis host and used for displaying an operation interface of the control analysis host.
Based on the above, the present invention has the advantage that the display quality of the stereoscopic display panel can be quantified by analyzing the luminance distribution of the stereoscopic display panel, so as to provide a standard for evaluating the consistency of the stereoscopic display panel.
In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Drawings
Fig. 1A is a schematic diagram of an evaluation system of a stereoscopic display panel according to an embodiment of the invention.
Fig. 1B is a top view of the stereoscopic display panel and the image sensor of fig. 1A.
Fig. 2 is a flowchart illustrating an evaluation method of a stereoscopic display panel according to an embodiment of the invention.
FIG. 3 is a luminance comparison diagram of a right-eye image and a left-eye image at different angles according to an embodiment of the present invention.
Fig. 4 is a diagram illustrating luminance distribution curves at a first angle and different angles according to an embodiment of the present invention.
Fig. 5 is a luminance distribution curve sensed at different visual distances at a first angle according to another embodiment of the present invention.
Wherein,
100: evaluation system of stereoscopic image display panel
110: rotary platform
120: image sensing device
122: sensing surface
122 a: second normal vector
124: lens barrel
126: image sensing assembly
130: control and analysis device
132: control analysis host
134: control screen
140: mobile platform
200: evaluation method of three-dimensional image display panel
210: displaying a detection picture
220: sensing the brightness of the detected picture by using an image sensing device
230: sensing the brightness of the detected image at different angles
240: analyzing the brightness uniformity of the detected picture
250: measurement of optimal viewing distance
260: calculating the degree of mutual interference
300: stereo image display panel
310: display surface
312: first normal vector
A. B: curve line
L, M, O, X, Y, Z: luminance distribution curve
CR: degree of mutual interference
D1: a first direction
D2: second direction
θ1: first angle
θ: angle of rotation
θk: best viewing angle
Detailed Description
Fig. 1A is a schematic diagram of an evaluation system of a stereoscopic display panel according to an embodiment of the invention. Fig. 1B is a top view of the stereoscopic display panel and the image sensor of fig. 1A. Fig. 2 is a flowchart illustrating an evaluation method of a stereoscopic display panel according to an embodiment of the invention. Referring to fig. 1A and fig. 2, the evaluation system 100 of the stereoscopic display panel of the present embodiment includes a rotating platform 110, an image sensing device 120, and a control and analysis device 130. In addition, the evaluation system may optionally include a mobile platform 140. The evaluation method 200 of the present embodiment includes steps 210 to 240, as shown in fig. 2.
Referring to fig. 1A and fig. 1B, first, the stereoscopic display panel 300 is placed on the rotary platform 110. The image sensing device 120 is disposed in front of the stereoscopic display panel 300 to sense the brightness of the detected image. In addition, the control and analysis device 130 is connected to the rotation platform 110 and the image sensor 120, respectively. The control and analysis device 130 may include a control and analysis host 132 and a control screen 134. The control and analysis host 132 is electrically connected to the stereoscopic display panel 300, the rotary platform 110, the mobile platform 140 and the image sensor 120. The control screen 134 is connected to the control analysis host 132, and the control screen 134 is used for displaying an operation interface of the control analysis host 132. The control and analysis device 130 controls the rotation platform 110 to rotate to different angles, and controls the image sensing device 120 to sense the brightness of the detected image at different angles, and converts the sensed brightness into a plurality of data for storage.
In addition, the image sensing device 120 is disposed on the movable platform 140. The movable platform 140 is disposed in front of the rotary platform 110, and the movable platform 140 moves along a first direction D1 toward the rotary platform 110 or a second direction D2 away from the rotary platform 110.
Referring to fig. 1A, fig. 1B and fig. 2, step 210 is performed to display a detection frame on the stereoscopic display panel 300. The display surface 310 of the stereoscopic display panel 300 has a first normal vector 312. The detection picture may include a left-eye picture and a right-eye picture. For example, the left-eye picture is a full black picture, and the right-eye picture is a full white picture. However, the present invention is not limited to the colors of the left-eye and right-eye images, and can be adjusted and changed according to the needs of the implementation situation. The stereoscopic display panel 300 can selectively display the left-eye image or the right-eye image by switching, and the stereoscopic display panel 300 can also display the left-eye image and the right-eye image simultaneously.
Next, step 220 is performed to sense the luminance of the detected image by using the image sensing device 120, wherein the sensing surface 122 of the image sensing device 120 has a second normal vector 122a, and an angle θ is formed between the second normal vector 122a and the first normal vector 312. In detail, the image sensing device 120 may include a lens 124 and an image sensing element 126. The lens 124 has a focusing function and is aligned with the stereoscopic display panel 300. The image sensor 126 is connected to the lens 124 and senses the brightness of the detected image displayed on the stereoscopic display panel 300. The image sensor 126 is, for example, a Charge Coupled Device (CCD).
Then, step 230 is performed to sense the brightness of the detected frame at different angles. In detail, when rotatingWhen the platform 110 is rotated, an angle θ between the first normal vector 312 on the display surface 310 of the stereoscopic display panel 300 and the second normal vector 122a on the sensing surface 122 of the sensing device 120 is changed. Under different angles θ, the brightness of the detected image sensed by the image sensor 120 is different. Wherein the second normal vector 122a and the first normal vector 312 have a first angle θ1Meanwhile, the image sensor 120 senses the highest luminance of the detected image. Wherein a first angle theta is obtained1The method of (2) is exemplified as follows.
First, a right-eye image is displayed, and the brightness of the right-eye image is sensed at different angles. Then, the left-eye image is displayed, and the brightness of the left-eye image is sensed under different angles. However, the order of displaying the right-eye image and the left-eye image is not limited, and the left-eye image and the right-eye image may be displayed first. Then, the brightness of the right eye image and the left eye image under different angles are compared to obtain the angle corresponding to the highest brightness, and the angle corresponding to the highest brightness is defined as a first angle theta1。
FIG. 3 is a luminance comparison diagram of a right-eye image and a left-eye image at different angles according to an embodiment of the present invention. Referring to fig. 3, the luminance of the right-eye image is sensed at different angles, and the different angles are plotted with respect to the sensed luminance as a curve a in fig. 3. Similarly, the luminance of the left-eye image is sensed at different angles, and the different angles are plotted with respect to the sensed luminance as curve B in fig. 3. As is clear from FIG. 3, comparing the luminance of the right-eye image and the left-eye image under different angles, an angle corresponding to the highest luminance can be obtained, and the angle is defined as a first angle θ1。
Referring to fig. 2, next, in step 240, the luminance uniformity of the detected frame is analyzed at different angles. The method for analyzing the luminance uniformity of the detected image is as follows. First, an X-axis located at the center of the inspection screen is selected. Preferably, the X-axis is selected at the very center of the inspection frame. Then, the brightness of each point on the selected X axis is sensed to obtain the brightness distribution curve of the brightness corresponding to each point on the selected X axis, and then the brightness uniformity of the detected picture is judged by using the brightness distribution curve.
Fig. 4 is a diagram illustrating luminance distribution curves at a first angle and different angles according to an embodiment of the present invention. Referring to FIG. 4, the horizontal axis represents the coordinate position of each point on the selected X-axis, and the vertical axis represents the luminance of each point on the corresponding X-axis at a first angle θ1The nearby angle values are used as luminance distribution curves, and the angle with the best uniformity is taken as the optimal angle thetak. In the present embodiment, at the first angle θ1For example, the luminance profile sensed at 3.57 ° is L, the luminance profile sensed at 3.87 ° is M, and the luminance profile sensed at 2.37 ° is O. As can be seen from fig. 4, the amplitude of the luminance distribution curve sensed under 3.57 ° is relatively flat, which means that the luminance distribution sensed under 3.57 ° is relatively uniform, in the embodiment, the optimal viewing angle θ k is 3.57 °.
The evaluation method 200 of the stereoscopic display panel of the present embodiment may further include using the following formula (1) to obtain the viewing distance. Wherein, thetakRepresents an optimal viewing angle, E represents a distance between both eyes of a viewer, and d represents a viewing distance. Under the viewing angle with the best brightness uniformity, the calculated visible distance is the best visible distance. The visible distance ranges between 0.3 m and 8 m according to the size of the stereoscopic display panel 300.
Fig. 5 is a luminance distribution curve sensed at different visual distances at a first angle according to another embodiment of the present invention. Referring to fig. 5, the stereoscopic image display panel 300 adopted in the embodiment is, for example, 15.4. The optimal angle obtained by the steps of the above embodiment is 3.57 °, and the luminance distribution of the detected picture under different visual distances is sensed at the optimal angle. In fig. 5, the sensed luminance distribution curve is X when the visible distance is 52 cm, Y when the visible distance is 50 cm, and Z when the visible distance is 60 cm. As is clear from fig. 5, the luminance distribution sensed at the visible distance 52 is most uniform. That is, the stereoscopic display panel 300 of the present embodiment has the best display quality at the best angle and the viewing distance 52 is a common value.
Finally, the method for evaluating the stereoscopic display panel of the present embodiment may include using the following formula (2) to define a degree CR of mutual interference (crosstalk) between the left-eye image and the right-eye image. Wherein R isminRepresents the minimum luminance, L, of the right-eye pictureminRepresents the minimum luminance of the left-eye picture; l ismaxRepresents the maximum luminance of the left-eye picture, RmaxIndicating the maximum luminance of the right-eye picture. Taking fig. 3 as an example, the minimum luminance of the curve a is divided by the maximum luminance of the curve B, and then multiplied by 100%, so as to obtain the mutual interference degree CR of the left-eye image and the right-eye image in the present embodiment. Conversely, the lowest luminance of the curve B and the highest luminance of the curve a may be used for calculation.
In summary, the method and system for evaluating a stereoscopic image display panel according to the present invention can obtain a luminance distribution curve by obtaining the luminance of the stereoscopic image display panel and analyzing the luminances sensed at different angles, and determine the display quality of the stereoscopic image display panel according to the luminance distribution curve. Therefore, the display quality of the stereoscopic display panel can be evaluated in a quantitative manner.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (10)
1. A method for evaluating a stereoscopic image display panel, comprising: comprises the following steps
Displaying a detection picture on a stereoscopic image display panel, wherein a display surface of the stereoscopic image display panel is provided with a first normal vector;
sensing the brightness of the detected picture by using an image sensing device, wherein a sensing surface of the image sensing device is provided with a second normal vector, and an angle is formed between the second normal vector and the first normal vector;
sensing the brightness of the detection picture under different angles, wherein when the second normal vector and the first normal vector have a first angle, the image sensing device senses the highest brightness of the detection picture;
analyzing the brightness uniformity of the detected picture under the angles;
measuring a visible distance of the stereoscopic image display panel; and
and calculating the mutual interference degree between the pictures displayed by the stereoscopic image display panel.
2. The method for evaluating a stereoscopic image display panel according to claim 1, wherein: the detection picture comprises a left-eye picture and a right-eye picture, and the method for obtaining the first angle comprises the following steps:
displaying the right-eye picture, and sensing the brightness of the right-eye picture at different angles;
displaying the left-eye picture, and sensing the brightness of the left-eye picture at different angles;
and comparing the brightness of the right eye image and the left eye image under different angles to obtain the angle corresponding to the highest brightness, wherein the angle is the first angle.
3. The method for evaluating a stereoscopic image display panel according to claim 1, wherein: the method for analyzing the brightness uniformity of the detected picture comprises the following steps:
selecting an X axis positioned in the center of the detection picture;
sensing the brightness of each point on the X axis to obtain a brightness distribution curve of each point on the X axis relative to the brightness; and
and judging the brightness uniformity of the detection picture by using the brightness distribution curve.
4. The method for evaluating a stereoscopic image display panel according to claim 1, wherein: the method for measuring the visible distance of the stereoscopic image display panel comprises the following steps of obtaining the visible distance by using the following mathematical formula (1):
Where θ k denotes an optimal viewing angle, E denotes a distance between both eyes of a viewer, and d denotes the viewing distance.
5. The method for evaluating a stereoscopic image display panel according to claim 4, wherein: the range of the visible distance is (0.3-8) meters.
6. The method for evaluating a stereoscopic image display panel according to claim 1, wherein: the method of calculating the degree of mutual interference includes using the following equation (2) to define the degree of mutual interference (crosstalk) between the left-eye picture and the right-eye picture:
Wherein Rmin represents the minimum luminance of the right-eye picture, Lmin represents the minimum luminance of the left-eye picture; lmax represents the maximum luminance of the left-eye picture, and Rmax represents the maximum luminance of the right-eye picture.
7. A system for evaluating a stereoscopic display panel, comprising: the method comprises the following steps:
a rotating platform, on which a stereoscopic image display panel is arranged, wherein the stereoscopic image display panel displays a detection picture, and a display surface of the stereoscopic image display panel has a first normal vector;
an image sensing device disposed in front of the stereoscopic image display panel to sense the brightness of the detected image, wherein a sensing surface of the image sensing device has a second normal vector, and an angle is formed between the second normal vector and the first normal vector; and
and the control and analysis device is respectively connected with the rotating platform and the image sensing device so as to control the rotating platform to rotate to different angles, control the image sensing device to sense the brightness of the detection picture under different angles, and convert the brightness into a plurality of data for storage.
8. The system for evaluating a stereoscopic image display panel according to claim 7, wherein: the image sensing device further comprises a moving platform arranged in front of the rotating platform, the moving platform moves along a first direction close to the rotating platform or a second direction far away from the rotating platform, and the image sensing device is arranged on the moving platform.
9. The system for evaluating a stereoscopic image display panel according to claim 7, wherein: the image sensing device is a charge coupled device, comprising:
a lens with focusing function, which is aligned to the display panel of the stereoscopic image; and
and the image sensing assembly is connected with the lens and senses the brightness of a detection picture displayed by the stereoscopic image display panel.
10. The system for evaluating a stereoscopic image display panel according to claim 7, wherein: the control and analysis device comprises:
the control analysis host is electrically connected with the three-dimensional image display panel and the image sensing device; and
and the control screen is connected with the control analysis host to display an operation interface of the control analysis host.
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| CN108683906A (en) * | 2018-05-29 | 2018-10-19 | 张家港康得新光电材料有限公司 | A kind of bore hole 3D display device parameter test method, device, equipment and medium |
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