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Video processor with small gamma correcting storage

A video processor and memory technology, applied in image data processing, color signal processing circuits, televisions, etc., can solve problems such as a large number of storage units and power consumption

Inactive Publication Date: 2006-11-22
NEC LCD TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, gamma correction requires a large number of memory cells and power consumption

Method used

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  • Video processor with small gamma correcting storage
  • Video processor with small gamma correcting storage
  • Video processor with small gamma correcting storage

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Experimental program
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Embodiment Construction

[0011] now for reference figure 1 , which shows a color video processor according to one embodiment of the invention. The color video processor includes a red component video sub-processor 1R, a green component video sub-processor 1G, and a blue component video sub-processor 1B. Since all subprocessors have the same configuration, only the details of the red component subprocessor are explained. In this embodiment, the number of bits used to represent the input video signal is greater than the number of bits used to represent the video input to the color liquid crystal display 2 .

[0012] Each sub-processor includes a bit rate converter 11 for converting 10-bit input sub-pixel data into 8-bit output sub-pixel data. An embodiment of bit rate conversion is implemented using the fundamentals of frame rate control. As will be described in detail later, the realization is by intercepting the lower two bits from the 10-bit input data, and representing the lower two bits of the 1...

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Abstract

A video processor comprising: a bit rate converter for converting an M-bit input video signal into an N-bit output video signal, where N is less than M, by preserving gray levels of the M-bit input video signal. A plurality of N-bit input grayscale levels is mapped to a plurality of output grayscale levels in a gamma corrected memory. The plurality of output gray levels are distributed on a non-linear curve complementary to the non-linear curve on which the gray levels of the display device are distributed. The memory delivers one of the output gray levels when the N-bit output video signal of the bitrate converter corresponds to one of the N-bit input gray levels. In one embodiment, the bit rate converter intercepts the low significant bits of the M-bit video signal, represents the low significant bits by different numbers of binary 1s, and distributes the binary 1s to different numbers of successive bits according to the value of the intercepted low significant bits. sequence frame.

Description

technical field [0001] The present invention relates generally to video processors and, more particularly, to video processors for display devices in which the gray levels are distributed on a non-linear curve. The invention is especially suitable for small display devices such as mobile terminals. Background technique [0002] Japanese Patent Application 1997-50262 discloses a video processor using dithering techniques. According to a related art video processor, gamma correction is performed on the gray scale of an input video signal by using a gamma correction memory (referred to as a lookup table) according to the gamma (gray scale) characteristic of video display. The gamma-corrected video signal is input to a dither circuit that compresses the number of bits representing the video signal to match the number of bits used for video display. If the input video signal is represented by 10 bits, the implemented gamma correction table must have 1,024 address locations or m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/64G06T5/00G09G3/20G09G3/36G09G5/00G09G5/02G09G5/06G09G5/10H04N1/407H04N5/20H04N9/69
CPCG09G3/20G09G3/2051G09G3/36G09G2320/0276
Inventor 伊藤正厚渡边崇志
Owner NEC LCD TECH CORP