Encoder including an error decision circuit
First Claim
1. An encoder comprising:
- memory means for storing an original image to be coded, said image being divided into a plurality of to-be-coded regions each being a to-be-coded block and to-be-transformed regions, and each region including a number of pixels each having a predetermined pixel value;
control means for outputting a to-be-coded region designation signal for selectively designating the to-be-coded regions for reading out, from said memory means, to-be-coded image data corresponding to one of the to-be-coded regions, outputting a to-be-transformed region designation signal for selectively designating the to-be-transformed regions for reading out, from said memory means, to-be-transformed image data corresponding to one of the to-be-transformed regions, and outputting a transform method designation signal for selectively designating transform methods for transforming the to-be-transformed image data;
transforming means for subjecting the to-be-transformed image data to a predetermined transformation in accordance with the transform method designation signal and outputting the transformed image data;
decision means for deciding an error of the transformed image data with reference to the to-be-coded region image data; and
mean value outputting means for outputting a mean value of pixels of the to-be-coded region as a code,wherein said control means includes code signal outputting means for outputting, as a code, the information on at least the to-be-transformed region and the transformation method with which the error decided by said decision means is decreased than a predetermined value.
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Abstract
An encoder comprises a memory for storing a to-be-coded original image, outputting a to-be-coded image signal in response to a to-be-coded region designation signal for designating a to-be-coded region used as a to-be-coded block, and outputting a to-be-transformed image signal in response to a to-be-transformed region designation signal for designating a to-be-transformed region; a transforming circuit for subjecting the to-be-transformed image signal to a predetermined transformation in response to a transformation method designation signal, and outputting a transformed image signal; a deciding circuit for deciding an error of the transformed image signal with reference to the to-be-coded image signal, and a control circuit for outputting, as a code, information on at least the to-be-transformed region and the transformation method which reduce the error decided by the deciding circuit to a predetermined value or below.
23 Citations
13 Claims
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1. An encoder comprising:
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memory means for storing an original image to be coded, said image being divided into a plurality of to-be-coded regions each being a to-be-coded block and to-be-transformed regions, and each region including a number of pixels each having a predetermined pixel value; control means for outputting a to-be-coded region designation signal for selectively designating the to-be-coded regions for reading out, from said memory means, to-be-coded image data corresponding to one of the to-be-coded regions, outputting a to-be-transformed region designation signal for selectively designating the to-be-transformed regions for reading out, from said memory means, to-be-transformed image data corresponding to one of the to-be-transformed regions, and outputting a transform method designation signal for selectively designating transform methods for transforming the to-be-transformed image data; transforming means for subjecting the to-be-transformed image data to a predetermined transformation in accordance with the transform method designation signal and outputting the transformed image data; decision means for deciding an error of the transformed image data with reference to the to-be-coded region image data; and mean value outputting means for outputting a mean value of pixels of the to-be-coded region as a code, wherein said control means includes code signal outputting means for outputting, as a code, the information on at least the to-be-transformed region and the transformation method with which the error decided by said decision means is decreased than a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification