JP2008164640A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of adjusting image quality in consideration of a viewing environment.
An optical sensor that detects brightness around a display device, a signal processing unit that calculates feature information of video data of an input video signal, a time detection unit that detects time, and viewing. The image quality correction amount is calculated using the viewer position input means 10 for inputting the position of the viewer, the detected brightness or the detected time or at least one of the input viewer position and the feature information of the video data. A calculation unit 7 and a display unit 5 that displays the video data corrected by the signal processing unit 8 using the video correction amount calculated by the calculation unit 7, and the brightness estimated from the brightness of external light or time And a display device that corrects image quality using a reflected light theoretical value calculated based on at least one of the viewer position.
[Selection] Figure 1

Description

  The present invention relates to a display device that displays an image in a vehicle interior, for example.

As shown in FIG. 9, the conventional display device includes a correction processing unit 62, a target correction amount calculation unit 63, a change amount control unit 64, and a scene change detection unit 65. The image quality is corrected by the change (see, for example, Patent Document 1).
JP 2002-262303 A

  However, in the conventional display device, since the image quality correction amount is detected using only the feature amount of the video data, for example, when the viewing environment such as in-vehicle changes, correction suitable for the viewing environment can be performed. There was a problem that high-quality image correction could not be performed.

  Therefore, the present invention has been made to solve the conventional problems, and is a display device capable of detecting viewing environment information and performing higher-performance video correction when correcting the image quality of a video signal. The purpose is to provide.

  The display device of the present invention includes a viewing environment detection unit that detects a viewer's environment, a video input unit that inputs video data, a video feature amount detection unit that detects a feature amount of video data, and a viewing environment detection unit. Correction amount calculation means for calculating the correction amount of the image quality using the detected viewing environment information and the feature amount detected by the video feature amount detection means, and video input means using the correction amount calculated by the correction amount calculation means And a display unit for displaying the video corrected by the correction processing unit.

  With this configuration, the display device of the present invention calculates the image quality correction amount based on the viewing environment and the feature amount of the video, so that the image quality can be corrected in consideration of the viewing environment, and the viewing environment can be made better than the conventional one. Appropriate image quality correction can be performed.

  In the display device of the present invention, the viewing environment detecting means acquires the current time and estimates the brightness of the external light.

  With this configuration, the image quality correction amount is calculated based on the brightness of the external light estimated from the time, so even if there is no means for detecting the brightness, the image quality is more suitable for the viewing environment than the conventional one. Can be corrected.

  In addition, the display device of the present invention includes viewer position input means for inputting the position of the viewer, and the correction amount calculation means has a configuration for calculating the correction amount based on the input position of the viewer. Yes.

  With this configuration, since the amount of image quality correction is calculated based on the viewer's position, the image quality can be corrected in consideration of the viewer's position, and the image quality can be corrected more appropriately for the viewing environment than the conventional one. Can do.

The present invention provides a display device having an effect that image quality correction suitable for a viewing environment can be performed more than a conventional one by calculating a correction amount using information of viewing environment and information of video data. It can be provided.

  Hereinafter, display devices according to embodiments of the present invention will be described with reference to the drawings.

  A display device according to a first embodiment of the present invention is shown in FIG.

  In FIG. 1, a display device 1 includes an optical sensor 2 that detects the brightness around the display device 1, and an A / A that converts a voltage value corresponding to the brightness detected by the optical sensor 2 from an analog signal to a digital signal. A D converter 6, a signal processing unit 4 for calculating feature information of video data of the input video signal 3, a time detection unit 11 for detecting time, a viewer position input unit 10 for inputting a viewer position, Feature information of the video data calculated by the signal processing unit 4 and at least one of the digital signal corresponding to the brightness output from the A / D converter 6 or the time detected by the time detecting means 11 or the position of the viewer Using the calculation unit 7 for calculating the image quality correction amount, the memory 8 for storing the calculation result when the calculation unit 7 performs calculation processing, and the image correction amount calculated by the calculation unit 7. Above A configuration in which No. processor 8 and a display unit 5 for displaying the image data corrected.

  The operation of the display device configured as described above will be described with reference to FIG.

  First, at least one of illuminance information obtained by converting the voltage corresponding to the brightness detected by the optical sensor 2 into a digital signal by the A / D converter 6 or the current time acquired by the time acquisition unit 11 is read (step S11). Then, it is determined whether only time information has been input (step S12). When it is determined that only the time information is input, for example, when the time is from 6:00 to 10:00, 1500 Lux, when the time is from 10:00 to 17:00, 10000 Lux, and when the time is from 17:00 to 19:00, 10 Lux When the time is after 19:00, the brightness is estimated as 0 Lux (step S13). Next, the viewer positions such as the front seat, the rear seat, the center of the vehicle, etc., which are input by the viewer position input means 10, are read (step S14). Next, the characteristic amount of the display unit such as the light reflectance and gamma characteristic of the display unit 5 stored in advance in the memory 8 is read (step S15). Then, using at least one of the viewer positions, the reflected light theoretical value is calculated by a calculation formula expressed by, for example, Formula 1 (Step S16).

Eh = E × α × cosθ (Formula 1)
Here, Eh is the reflected light theoretical value, E is the brightness detected by the optical sensor 2 or the brightness estimated from the time, α is the light reflectance of the display unit, and θ is the viewer and display. The angle of the unit 5 is, for example, 30 degrees if the viewer position is the front seat, 60 degrees if the rear seat is 0 degrees, and 0 degrees if the center is in-vehicle.

  Next, for example, feature quantities of the video signal such as minimum luminance, average luminance, maximum luminance, minimum color difference, average color difference, maximum color difference are read (step S17). Then, a correction amount of image quality such as brightness, contrast, color gain, gamma, and hue is calculated using the feature amount of the video signal and the reflected light theoretical value (step S18). The correction amount is calculated by, for example, Expression 2 to Expression 4.

Bright = Ymin + Eh (Formula 2)
Contrast = (Yav + Eh) / Yav (Formula 3)
Colorgain = (Cav + Eh) / Cav (Formula 4)
Where Bright is the brightness correction amount, Contrast is the contrast correction amount, Colorgain is the color gain correction amount, Ymin is the minimum luminance, Yav is the average luminance, Cav is the average color difference, and Eh is the theoretical value of reflected light It is.

  According to the display device of the first embodiment of the present invention, the reflected light theoretical value calculated based on at least one of the brightness estimated from the brightness of external light or time and the position of the viewer is used. By correcting the image quality, it is possible to correct the image quality more suitable for the viewing environment than before.

  As described above, the display device according to the present invention can correct the image quality more suitable for the viewing environment than the conventional one by calculating the correction amount using the viewing environment information and the video data information. For example, it is useful as a display device that displays an image in the passenger compartment.

The block diagram of the display apparatus in the 1st Embodiment of this invention The flowchart for demonstrating the operation | movement of the image quality correction process of the display apparatus in the 1st Embodiment of this invention Block diagram of a conventional display device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,20 Display apparatus 2 Optical sensor 3, 21 Input video signal 4 Signal processing part 5 Display part 6 A / D conversion part 7 Calculation part 8 Memory 9 Processing circuit 10 Viewer position input means 11 Time detection means 50 Display apparatus position detection Means 22 Correction processing unit 23 Target correction amount calculation unit 24 Change amount control unit 25 Scene change detection unit 26 Output video signal

Claims (3)

Viewing environment detection means for detecting the viewer's environment, video input means for inputting video data, video feature amount detection means for detecting feature amounts of the video data, and viewing environment information detected from the viewing environment detection means Correction amount calculating means for calculating a correction amount of image quality using the feature amount detected by the video feature amount detecting means, and input by the video input means using the correction amount calculated by the correction amount calculating means. A display device comprising: correction processing means for correcting the video image; and display means for displaying the video image corrected by the correction processing means. The display device according to claim 1, wherein the viewing environment detection unit acquires a current time and estimates the brightness of external light. The viewer position input means for inputting the position of the viewer, wherein the correction amount calculation means calculates a correction amount based on the input viewer position. 2. The display device according to 2.

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