JP2009218660A - Video display - Google Patents

Abstract

When a subject of a video camera is dark, the video on the video display is unclear. SOLUTION: A camera that generates a video signal and outputs aperture information; a video display that displays the video signal on a screen; It is equipped with a video signal processing circuit that performs contrast adjustment, black level adjustment, luminance gamma correction, video display timing generation and other image quality correction for display on the display, and supplies the shutter aperture of the camera to the video display. Since the display monitors the aperture of the camera and controls the display contrast when the subject of the camera is dark, it is possible to perform control to increase the contrast. Is to improve.
[Selection] Figure 1

Description

  The present invention relates to a video display apparatus that receives a video signal of a video camera.

  A conventional video display device has a built-in optical sensor, detects the amount of light around the display with the optical sensor, and controls the luminance of the backlight according to the amount of light received by the optical sensor. (See Patent Document 1).

FIG. 2 shows a conventional video display device described in Patent Document 1. In FIG. In FIG. 2, the video display 101 detects ambient light amount information 104 with the optical sensor 102 and controls the luminance of the display.
JP-A-6-11713

  However, in the conventional configuration, since the light sensor 202 built in the display detects the light, the amount of light of the subject of the video camera cannot be detected. For example, when the subject of the camera is dark, Had an unclear problem.

  The present invention solves the above-described conventional problems, and provides a video display device that does not blur the camera image when the camera subject is dark. An object of the present invention is to perform appropriate image quality correction in a video display device.

  In order to solve the above conventional problems, a video display apparatus according to the present invention includes a camera that generates a video signal and outputs aperture information, a video display that displays the video signal on a screen, and a video signal that is displayed on a liquid crystal display. For this purpose, it is equipped with a video signal processing circuit that performs contrast adjustment, black level adjustment, luminance gamma correction, video display timing generation and other image quality correction, and supplies the shutter aperture of the camera to the video display for contrast adjustment It is characterized by that.

  With this configuration, it is possible to improve the visibility of an image by monitoring the aperture amount of the camera, controlling the contrast of the display when the subject of the camera is dark, and performing control to increase the contrast.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1)
According to a first aspect of the present invention, the video display device monitors the aperture amount of the camera lens and performs control to increase the display contrast when the subject of the camera is dark, thereby improving the visibility of the video. Features.

  Further, the second invention of the present invention is a camera that generates a video signal and outputs aperture information, a video display that displays the video signal on a screen, a contrast adjustment for displaying the video signal on a liquid crystal display, and a black level. Adjustment, brightness gamma correction, video display timing generation, and other video signal processing circuits that perform image quality correction, supply the shutter aperture of the camera to the video display, and adjust the display contrast when the subject is dark And the visibility of the video is improved. A specific configuration will be described below.

  FIG. 1 is a diagram showing a configuration of a video display apparatus according to the present invention. In FIG. 1, 101 is a video display, 102 is a video camera, 103 is a video signal processing circuit, and 104 is a video display device comprising aperture information.

  Next, a specific operation of the video display system having the above configuration will be described. First, the video camera 102 outputs a video signal 105 and aperture information. Next, the video signal 105 and the aperture information 104 are input to the video signal processing circuit 103.

  Next, the video signal processing circuit 103 performs contrast adjustment, black level adjustment, luminance gamma correction, drive timing generation of the video display 101, and other image quality correction of the video signal 103. Next, the output of the video signal processing circuit 103 is input to the video display 101, and the video of the video signal 105 is displayed.

  Here, since the aperture amount of the lens is controlled to be small when the subject of the camera is dark, the video camera 102 outputs this shutter aperture amount to the video signal processing circuit 103 as aperture information 104.

  On the other hand, the video signal processing circuit 103 monitors the aperture information 104 and performs control to increase the contrast when the aperture amount is controlled when the subject of the camera is dark, thereby improving the visibility of the video.

  Further, when the camera subject is bright and the aperture amount is controlled, the contrast is lowered so that the level of the video displayed on the video display 101 is not saturated.

  Therefore, the problem that the video signal 105 of the video camera 102 becomes unclear when the subject of the video camera 102 is dark can be solved.

  Furthermore, the present invention is a technique effective for improving the visibility of a rear camera image on a vehicle-mounted display.

(Second Embodiment)
In the second embodiment, the video display display system of the present invention described in the first embodiment will be described in more detail with reference to FIGS.

  The video display display system of the present invention includes an imaging device 300 that captures a video signal, a video display device 350 that displays video captured by the imaging device, and a connection device 330 that connects the imaging device 300 and the video display device 350. Has been. Here, the imaging device 300 that captures a video signal refers to a device that can capture a still image or a moving image. Specifically, a digital camera (DSC) as a device that captures a still image or a video camera as a device that captures a moving image. And so on. The connection device 330 may be wireless or wired, and specifically refers to HDMI (High Definition Multimedia Interface) or the like.

  Next, a more detailed configuration of the imaging apparatus 300 according to the present invention will be described with reference to FIG. The imaging apparatus 300 includes an imaging unit 302 that includes a lens and an image processing circuit that generates an RGB image based on a signal from the CCD, a CCD that converts information of light that has entered from the lens into a digital signal, A video signal imaged by the imaging unit 302 (in this specification, the video signal means both a moving image and a still image), setting information stored in a storage unit (first) 306 described later, and Are output to an external device by superimposing them, a storage unit (first) 306 that records setting information indicating settings at the time of imaging captured by the imaging unit 302, an imaging unit 302, an output unit 304, and a storage And a control unit (first) 308 that controls the unit (first) 306.

  Here, the setting information stored in the storage unit (first) 306 will be described. This setting information refers to exposure information for setting the amount of light from the imaging target to be input to the above-described CCD at the time of imaging in the imaging unit 302 and the opening amount of the entrance for inputting the light from the imaging target. Aperture information to be shown, shutter speed information for determining a time for taking in light at the time of imaging, and the like. Note that the present invention is not limited to this. For example, when shooting a zoom information for determining the range of an object to be imaged, resolution information that is resolution information of a video signal, or an object to be imaged nearby. It is also possible to utilize information such as mode information such as a macro shooting mode to be used and a shooting mode in which a human face is recognized.

  Next, a more detailed configuration of the video display device 350 according to the present invention will be described with reference to FIG. The video display device 350 includes an input unit 352 that inputs a video signal and setting information input from the imaging device 300 via the connection device 330, a correction unit 354 that corrects the image quality of the video signal input from the input unit, A storage unit (second) 356 that stores setting information input from the input unit, an output unit 358 that outputs the video signal corrected by the correction unit to the display, an input unit 352, a correction unit 354, and a storage unit (first 2) 356 and a control unit (second) 360 that controls the output unit 358.

  Here, specific processing of the correction unit 354, which is a feature of the present invention, will be described in detail. The correction unit 354 includes a memory 380 that holds the video signal output from the input unit 352, and, for example, contrast adjustment, black level adjustment, luminance gamma correction, or edge enhancement for the video signal held in the memory 380. The image quality correction unit 382 that corrects the image quality by performing the process, the acquisition unit 384 that acquires the setting information indicating the setting at the time of imaging stored in the storage unit (second) 356, a predetermined setting information A setting unit 386 that sets a value as a threshold value and a comparison unit 388 that compares the setting information acquired by the acquisition unit 384 with the threshold value set by the setting unit 386 are provided. Based on the comparison result, the image quality correction unit 382 is provided. The image quality is corrected based on the setting information.

  Note that the setting unit 386 that sets a predetermined value of the setting information as a threshold value in advance can be set by the user using a remote controller or the like from the outside, for example. This makes it possible to further correct the image quality according to the user's preference.

  Next, the processing of the correction unit 354 will be described using aperture information that is one of setting information as an example. As described above, the aperture information is information indicating the opening amount of the entrance for inputting light from the object to be imaged, and the amount of light input from the object to be imaged to the CCD is set by this aperture information. In addition, it is possible to determine how far the front and back can be clearly imaged. For example, by setting the aperture to a small value (aperture), it is possible to focus over a wide range and to capture a wide range of images from the front to the far side. On the other hand, when the aperture is large (opens the aperture) It is possible to perform imaging in a state where the front and rear of the imaging target combined with are softly blurred.

  First, in the setting unit 386 of the correction unit 354, a threshold value for aperture information is set in advance. Next, in the comparison unit 388, when the setting acquired by the acquisition unit 384 has information less than or equal to the threshold value, that is, when the amount of light from the imaging target is lower than the threshold value and the image is dark, In the case where the brightness level is set high in the image quality correction unit and the input aperture information is greater than or equal to the threshold value, that is, when the image is a bright image with a large amount of light from the imaging target, It is conceivable that the luminance level is set low in the image quality correction unit.

  In addition, when the aperture information is below the threshold, it is considered that a clear video signal with a wide range of focus has been input, so a sharper video signal is output by increasing the edge enhancement setting. On the other hand, if the input aperture information is greater than or equal to the threshold value, that is, it is considered that the video signal that was captured is softly blurred before and after the focused imaging target. Appropriate processing can be performed by setting the contour emphasis setting low.

  Similarly, when the setting information is exposure information that sets the amount of light input from the object to be imaged to the CCD, if the exposure information is equal to or less than a threshold by comparison of the comparison unit 388, the image quality correction unit By increasing the contrast of the video signal, a clearer video signal can be output.

  Similarly, when the setting information is shutter speed information that determines the time for taking in light at the time of imaging, when the shutter speed information is equal to or smaller than a threshold value (that is, when the shutter speed is high) by the comparison unit 388. The image quality correction unit 382 can output a clearer video signal by increasing the contrast of the video signal.

  Further, when the setting information indicates that a shooting mode in which a human face is recognized at the time of imaging is used, the image quality correction can be performed so that the outline of the human face is clearly displayed by the image quality correction unit 382. It is.

  As described above, in the present invention, it is possible to perform image quality correction appropriately reflecting the setting information of the imaging apparatus itself when the video signal is imaged, and it is possible to perform more appropriate image quality correction. At the same time, it is not necessary to provide an extra circuit in the image display device 350 for image quality correction as in the prior art, and the circuit scale can be reduced.

  In the above-described embodiment, exposure information for setting the amount of light input from the imaging target to the CCD or aperture information indicating the opening amount of the entrance for inputting the light from the imaging target or during imaging However, the present invention is not limited to this, and the image correction may be performed based on a plurality of pieces of information. Is possible. As a result, the image correction unit 382 can perform more appropriate image quality correction.

  According to the video display device of the present invention, a camera that generates a video signal and outputs aperture information, a video display that displays the video signal on a screen, and a contrast adjustment and a black level adjustment for displaying the video signal on a liquid crystal display. A video signal processing circuit for performing luminance gamma correction, video display timing generation, and other image quality correction, supplying the shutter aperture of the camera to the video display, the monitor monitoring the camera aperture, When the subject is dark, it is possible to control the contrast of the display and increase the contrast, and the present invention is useful as an apparatus or method for improving the image visibility of the image display apparatus.

The figure of the video display apparatus in Embodiment 1 of this invention Diagram of conventional video display device The figure of the video display apparatus in Embodiment 2 of this invention The figure which shows the structure of the correction | amendment part in Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Video display 102 Video camera 103 Video signal processing circuit 104 Aperture information 105 Video signal 201 Video display 202 Optical sensor 203 Video signal processing circuit 204 Light quantity information 300 Imaging device 302 Imaging unit 304 Output unit 306 Storage unit (first)
308 Control unit (first)
330 connection device 350 video display device 352 input unit 354 correction unit 356 storage unit (second)
358 Output unit 360 Control unit (second)

Claims (10)

A video display display system comprising an imaging device that captures a video signal and a video display device that receives the video signal captured by the imaging device and displays the video signal on a screen,
The imaging device includes a recording unit that records setting information indicating settings at the time of imaging of the imaging device;
An output unit that superimposes and outputs the setting information recorded in the recording unit on the video signal;
The video display device includes an input unit that receives a video signal and setting information output by the output unit;
A correction unit that corrects the image quality of the video signal received by the input unit,
A video display display system, wherein the correction unit corrects the image quality of the video signal based on setting information received by the input unit. The setting information includes exposure information for setting the amount of light input from the imaging target to the CCD, aperture information indicating the opening amount of the entrance for inputting light from the imaging target, or light at the time of imaging. 2. The video display system according to claim 1, further comprising at least one of shutter speed information for determining time. The video display system according to claim 1, wherein the correction unit performs at least one of a contrast adjustment, a black level adjustment, a luminance gamma correction, and an edge enhancement process. The correction unit includes a memory for holding a video signal output from the input unit;
An image quality correction unit that corrects image quality by performing at least one of contrast adjustment, black level adjustment, luminance gamma correction, or edge enhancement on the video signal held in the memory;
An acquisition unit that acquires the setting information received by the input unit;
2. The video display system according to claim 1, wherein the image quality correction by the image quality correction unit is performed based on setting information. The correction unit further sets a predetermined threshold for the setting information; and
A setting unit that compares the setting information received by the input unit with a threshold value of the setting unit;
5. The video display system according to claim 4, wherein a correction amount of the image quality correction unit is determined based on a comparison result of the comparison unit. In the case where the setting information is exposure information that sets the amount of light input from the object to be imaged to the CCD, and the exposure information is equal to or less than a threshold by comparison of the comparison unit, the image quality correction unit 6. The video display system according to claim 5, wherein the contrast of the signal is amplified. When the setting information is aperture information indicating the opening amount of the entrance for inputting light from the object to be imaged, and the aperture information is equal to or less than a threshold value by comparison of the comparison unit, the image quality correction unit 6. The video display system according to claim 5, wherein the contrast of the signal is amplified. When the setting information is shutter speed information that determines the time for taking in light at the time of imaging, and the shutter speed information is equal to or less than a threshold by comparison of the comparison unit, the image quality correction unit amplifies the contrast of the video signal. 6. The video display system according to claim 5, wherein: In a system that receives video signals from a video camera on a video display device, obtains lens aperture information from the camera, monitors the camera aperture, and controls the display to increase when the camera subject is dark. A video display device characterized by improving video visibility. Camera that generates video signal and outputs aperture information, video display that displays video signal on screen, contrast adjustment, black level adjustment, luminance gamma correction and video display timing generation to display video signal on liquid crystal display A video signal processing circuit that performs image quality correction including any one of the above, and a contrast adjustment is performed by supplying a shutter aperture amount of the camera to the video display.

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