New compression format and apparatus using the new compression format for temporarily storing image data in a frame memory

A technology for compressing format and image data, applied in image data processing, image communication, image coding and other directions, it can solve the problem of increasing the cost of frame memory, and achieve the effect of improving performance and reducing quantitative artifacts.

Inactive Publication Date: 2011-06-15
NXP BV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The amount of frame memory required in the display driver of such a display greatly increases the cost of the overall device

Method used

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  • New compression format and apparatus using the new compression format for temporarily storing image data in a frame memory
  • New compression format and apparatus using the new compression format for temporarily storing image data in a frame memory
  • New compression format and apparatus using the new compression format for temporarily storing image data in a frame memory

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Embodiment Construction

[0051] Before describing the detailed embodiments of the present invention, some basic information about conventional transformation and compression schemes is given.

[0052] Color images processed by display drivers are usually rendered in RGB format. This is a format in which pixels of a color image are composed of red (R), green (G) and blue (B) components.

[0053] The YUV format represents pixel attributes in luma (Y) and chrominance (U, V) components. Brightness (or luma) refers to black and white information in image data, and chroma (or chroma) refers to color information in image data. The YUV color space distinguishes luma and chrominance properties which can be handled separately.

[0054] Fig. 1 shows a first embodiment of the invention. For example, the circuit 40 of FIG. 1 is part of a display driver and includes a frame memory 43 (eg, RAM) for temporarily storing image data representing a color image. In this embodiment, for example, RAM 43 may have an inte...

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Abstract

Display driver (40) with a frame memory (43) for temporarily storing image data representing a color image and a data bus for feeding RGB-formatted image data to said display driver (40). The display driver (2) comprises means for performing an encoding decision process (42) that is based on an analysis of the nature of a pixel cluster of said image data. The means for performing a decision process (42) allow the display driver (43) to decide whether a first compression format or a second compression format is to be applied for compression of said pixel cluster. The first compression means (33.1) perform a compression of said pixel cluster into said first compression format (quantized RGB), and the second compression means (33.2) perform a compression of said pixel cluster into said second compression format (color compressed). The pixel clusters and related compression format code are stored after compression in an available storage area of the frame memory (24) such that parts of said image data can be stored in said storage area in the first compression format and another part of said image data can be stored in said storage area in the second compression format. Said compression format code is used to perform a decision process allowing the display driver (20) to decide whether a first decompression format or a second decompression format is to be applied for decompressionof said pixel cluster.

Description

technical field [0001] The present invention relates to a compression scheme and more particularly to a display driver having a frame memory for temporarily storing image data representing a color image. Background technique [0002] There are various applications for image compression. In image compression, there are various compression methods. Compression algorithms use properties of natural scenes such that the quality loss introduced is acceptable to human observers. Methods that provide satisfactory results for natural images (images with limited color fluctuations between adjacent pixels) perform poorly for unnatural type images, and vice versa. [0003] Usually the native image is first converted to the YUV domain using the luma and two chrominance (color) components. An example of such a format is the so-called YUV4:4:4. Since the human eye is typically not sensitive to color changes over short distances, chrominance components can be shared between two adjacent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N1/64H04N1/60G06T9/00G09G5/02
CPCH04N7/26111H04N7/26244G09G3/2092H04N7/26069H04N7/26122H04N7/26255H04N7/26101H04N19/00278G09G2340/02H04N19/00315H04N19/00303H04N19/00096H04N7/26292H04N19/00084H04N19/00078H04N19/00139G09G2360/18H04N1/642H04N19/00127H04N7/26085H04N1/6072H04N19/12H04N19/122H04N19/126H04N19/132H04N19/136H04N19/176H04N19/182H04N19/186
Inventor 克里斯托夫·R·斯皮尔斯马特乌斯·J·G·拉默斯
Owner NXP BV
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