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Apparatus and method for image processing, compression, decompression, transfer, transmission, and reception, and program and display device

A technology of image processing device and compression method, which is applied in the field of transmission, sending and receiving devices, image processing, decompression, and compression, and can solve problems such as granular quality degradation

Inactive Publication Date: 2007-04-11
NEC CORP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0020] However, in the conventional system disclosed in Patent Document 2, graininess quality degradation in images can be slightly observed

Method used

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  • Apparatus and method for image processing, compression, decompression, transfer, transmission, and reception, and program and display device
  • Apparatus and method for image processing, compression, decompression, transfer, transmission, and reception, and program and display device
  • Apparatus and method for image processing, compression, decompression, transfer, transmission, and reception, and program and display device

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Embodiment Construction

[0104] The present invention will now be described in detail in conjunction with preferred embodiments with reference to the accompanying drawings.

[0105] In traditional image processing, the grainy or rough appearance of images is caused by errors generated before or after image processing, which also include strong high spatial frequency components. Errors of high spatial frequency components are conspicuous in slight gradation image areas and flat gradation image areas, but on the other hand, are not conspicuous in large gradation change areas such as edge portions or thin lines. Also, as the compression rate becomes higher, the error of the high spatial frequency component becomes larger. The compression ratio used to reduce the number of bit-planes in error-prone regions is determined to be smaller than in error-insignificant regions, and the compression ratio difference between these regions is determined by another method to prevent granular quality degradation. meth...

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Abstract

Image processing, compressing, decompressing, transmitting, sending and receiving devices and methods, their programs and a displaying device, in which a bit plane number is increased again after the bit plane number is first reduced to enable it to largely improve or remove granular quality deterioration in a mild gradation area and a plain gradation area within an image. For data compression, a first image processor includes a block coder for executing a reversible compression of image data of pixels of a raster image and a bit plane compressor for conducting an irreversible compression of the image data. For data decompression, a second image processor includes a bit plane decompressor for carrying out an irreversible decompression of the compressed data and a block decoder for executing a reversible decoding of the compressed data, to output decompressed image data to a display for displaying a reproduced raster image. The compressed data is once stored in a memory.

Description

technical field [0001] The present invention relates to image processing, compression, decompression, transmission, sending and receiving devices and their methods, programs and display devices, and in particular to image processing devices, image compression devices, image decompression devices, image transmission devices, image sending devices, Image receiving device, display device, and image processing method, image compression method, image decompression method, image transmission method, image transmission method, image reception method, and program thereof, for use in image compression and decompression processing according to storage The storage capacity of the display for the memory of raster images to achieve high image quality, greatly improve image quality, greatly improve or eliminate grainy quality degradation, and improve the efficiency of raster image transfer from computer to display. Background technique [0002] Currently, a method for transferring a raste...

Claims

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Application Information

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IPC IPC(8): H04N7/26G09G5/00G09G5/02G09G5/36H04N19/136H04N19/156H04N19/184H04N19/186H04N19/436
Inventor 宫坂大吾
Owner NEC CORP
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