Unlock instant, AI-driven research and patent intelligence for your innovation.

Image signal processing method, image signal processing apparatus, and image displaying apparatus

An image signal processing and image signal technology, which is applied in image communication, TV, color TV parts, etc., can solve problems such as inability to recognize grayscale changes, grayscale distortion, and inability to restore brightness

Inactive Publication Date: 2010-02-17
PANASONIC CORP
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In this way, according to the conventional non-linear correction method, since the display device is affected by the ambient light of the place where it is installed, it cannot restore the brightness perceived by people to a linear characteristic, especially when the input grayscale is low and dark The grayscale changes in the image, so there is a problem of grayscale distortion

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Image signal processing method, image signal processing apparatus, and image displaying apparatus
  • Image signal processing method, image signal processing apparatus, and image displaying apparatus
  • Image signal processing method, image signal processing apparatus, and image displaying apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] figure 1 is a circuit block diagram of the image display device 100 according to Embodiment 1 of the present invention. The image signal processing device 101 performs nonlinear correction on the input image signal, that is, the input gradation, and outputs the result to the display device 103 . The display device 103 is a display device using a DMD, a PDP, or the like that does not have a gamma characteristic. The image signal processing device 101 includes an ambient light detection unit 104 that detects the brightness of the surroundings, and a conversion unit 105 that performs non-linear correction of the input gradation according to the brightness of the surroundings.

[0026] The ambient light detection unit 104 includes a photosensor 106 that detects ambient brightness and an AD conversion unit 107 that converts a detection signal from the photosensor 106 into a digital signal. The conversion unit 105 has a plurality of LUTs 108 for nonlinearly correcting the ...

Embodiment 2

[0033] Figure 4 is a circuit block diagram of the image display device 300 according to Embodiment 2 of the present invention. The same reference numerals are assigned to the same circuit blocks as those in Embodiment 1, and description thereof will be omitted. The difference between the second embodiment and the first embodiment is that the characteristics of the nonlinear correction not only change according to the ambient light, but also change according to the display mode of the display device 103 . For example, in a display device using a PDP, there is a trade-off between the number of grayscales that can be displayed (hereinafter, abbreviated as "grayscale display capability") and the maximum brightness that can be displayed in terms of its driving principle. Relationship. Therefore, as the display mode of the display device 103, "dynamic mode", "standard mode", "movie mode" and the like are set, and it is designed so that the user can select his / her favorite display...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An image signal processing method for nonlinear correcting image signals to be inputted to a display device (103), wherein the nonlinear correction characteristic is modified based on a brightness ofthe place where the display device (103) is located. According to this method, even when the display brightness of the display device (103) uniformly rises due to the ambient light, the characteristicof the brightness perceived by human being for image signals can be made linear.

Description

technical field [0001] The present invention relates to an image signal processing method for nonlinearly correcting an image signal, an image signal processing device, and an image display device using the image signal processing device. Background technique [0002] Human visual properties are nonlinear, in particular, as Figure 5 As shown, the degree of brightness perceived by humans has a characteristic of a logarithmic function with respect to brightness. Additionally, if Figure 6A As shown, the display luminance of an image signal for a CRT (cathode ray tube) has a so-called gamma (γ) characteristic. Therefore, in a display device using a CRT, the gamma characteristic and the visual characteristic of the logarithmic function cancel each other out, and the degree of brightness perceived by humans exhibits a substantially linear characteristic with respect to the image signal. [0003] On the contrary, display devices such as DMD (Digital Mirror Device, Digital Micro...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/58
Inventor 山田和弘
Owner PANASONIC CORP