Image processing apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsEitaro Nishihara, Zhixiong Wu, Yoshihiko Ogawa
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Abstract
An image processing apparatus includes a memory for storing image data, a loss-compression circuit for loss-compressing the image data, an expansion circuit for expanding the loss-compressed image data, and a difference circuit for calculating a difference between the original image data of the image memory and the expanded image data of the expansion circuit. A lossless compression circuit lossless-compresses the difference image data obtained by the difference circuit. A multiplexer multiplexes the loss-compressed image data output from the loss-compression circuit, with the lossless-compressed difference data obtained by the lossless-compression circuit.
Claims15
An image data processing apparatus comprising:
- image output means for outputting image data;
- first compression means, for loss-compressing the image data from said image output means;
- image data expansion means for expanding the image data compressed by said first compression means, to output expanded image data;
- difference means, connected to said image data output means and said image data expansion means, for calculating a difference between the image data of said image output means and the expanded image data, and outputting difference image data;
- second compression means, for compressing the difference image data output from said difference means;
- and
- multiplexing means, connected to said first and second compression means, for multiplexing the loss-compressed image data and compressed difference image data;
- and wherein
- said first compression means comprises transformation means for orthogonal-transforming the image output from said image data output means, quantization means for quantizing the output of said transformation means and outputting the quantized data to said expansion means, and encoding means for encoding the quantized data of said quantization means and outputting encoded data to said multiplexing means.
An image data processing apparatus comprising:
- image memory means for storing image data;
- address means for selectively outputting, to said image memory means, first address data corresponding to a region of interest, so as to read out, from said image memory means, image data corresponding to the region of interest, and second address data corresponding to a region other than the region of interest, so as to read out image data corresponding to a region other than the region of interest;
- first compression means for lossless-compressing the image data corresponding to the region of interest, read out from said image memory means by said address means;
- second compression means for loss-compressing the image data corresponding to the region other than the region of interest, read out from said image memory means by said address means;
- and
- storage means for storing compressed data obtained by said first and second compression means;
- and wherein
- said address means outputs first and second address data for reading out, from said image memory means, image data including an overlapping region of the region of interest and the region other than the region of interest.
An image data processing apparatus comprising:
- image output means for outputting image data;
- first compression means, for loss-compressing the image data from said image output means;
- first expanding means for expanding the image data compressed by said first compression means, to output expanded image data;
- first difference mean, connected to said image data output means and said first expanding means, for calculating a difference between the image data of said image output means and the expanded image data, and outputting first difference image data;
- second compression means, for compressing the first difference image data output from said first difference means, to output compressed difference data;
- second expanding means, for expanding the compressed difference data, to output expanded difference data;
- second difference means, connected to said first difference means and said second expanding means, for calculating a difference between the difference data of said first difference means and the expanded difference data of said second expanding means, and outputting second difference image data to succeeding compression means and difference means;
- and
- multiplexing means, connected to said first and second compression means and said succeeding compression means, for multiplexing the loss-compressed image data and the compressed difference image data.
Dependencies are inferred from the claim text.