Image coding apparatus, image coding method, image decoding method, image decoding apparatus, image data transmitting method and recording medium

An apparatus for decoding coded data generated by coding image data, comprising:

• means for receiving the coded data;
• means for decoding the coded data and generating decoded image data, wherein the coded data is generated by the steps of:
• generating compressed data having a plurality of pixels by reducing a number of pixels of the original data;
• generating corrected data by adjusting a value of each pixel of the compressed data;
• predicting the original data based on the corrected data to generate predicted data having a plurality of predicted pixels;
• calculating, with respect to the original image data, a predictive error of the predicted data;
• and
• determining suitability of the corrected data as coded data based upon the predictive error;
• wherein the steps of generating corrected data, predicting the original image data, calculating a predictive error, and determining suitability are repeated unless the predictive error is less than a predetermined threshold.

A method for coding original data having a plurality of pixels, comprising the steps of:

• generating compressed data having a plurality of pixels by reducing a number of pixels of original image data;
• generating corrected data by adjusting a value of each pixel of the compressed data;
• predicting the original image data based on the corrected data and generating predicted data having a plurality of predicted pixels;
• calculating, with respect to the original image data, a predictive error of the predicted data;
• determining suitability of the corrected data as coded data of the original image based upon the predictive error;
• and
• repeating the steps of generating corrected data, predicting the original image data, calculating a predictive error, and determining the suitability of the corrected data unless the predictive error is less than a predetermined threshold.

A method for decoding coded data generated by coding original image data, comprising the steps of:

• receiving the coded data;
• decoding the coded data and generating decoded image data, wherein the coded data is generated by the steps of:
• generating compressed data having a plurality of pixels, by reducing a number of pixels of said original image data;
• generating corrected data by adjusting a value of each pixel of the compressed data;
• predicting the original image data based on the corrected data and generating predicted data having a plurality of predicted pixels;
• calculating, with respect to the original image data, a predictive error of the predicted data;
• determining suitability of the corrected data as coded data based upon the predictive error;
• and
• repeating the steps of generating corrected data, predicting the original image data, calculating a predictive error, and determining suitability of the corrected data, unless the predictive error is less than a predetermined threshold.

An apparatus for coding original image data having a plurality of pixels, comprising;

• a subsampling circuit for generating compressed data by reducing a number of pixels of original image data;
• a correcting circuit for generating corrected data by adjusting a value of each pixel of the compressed data;
• a predicting circuit for predicting the original image data based on the corrected data to generate predicted data having a plurality of predicted pixels;
• a calculator for calculating, with respect to the original image data, a predictive error of the predicted data;
• and
• a determining circuit for determining suitability of the corrected data as coded data based upon the predictive error;
• wherein the correcting circuit, the predicting circuit, the calculator, and the determining circuit operate repeatedly unless the predictive error is less than a predetermined threshold.

An apparatus for decoding coded data generated by coding image data, comprising;

• a circuit for receiving the coded data;
• a decoder for decoding the coded data and generating decoded image data, wherein the coded data is generated by the steps of:
• generating compressed data having a plurality of pixels by reducing a number of pixels of original image data;
• generating corrected data by adjusting a value of each pixel of the compressed data;
• predicting the original image data based on the corrected data to generate predicted data having a plurality of predicted pixels;
• calculating, with respect to the original image data, a predictive error of the predicted data;
• and
• determining suitability of the corrected data as coded data based upon the predictive error;
• and
• repeating the steps of correcting the compressed data, predicting the original image data, calculating a predictive error and determining the suitability of the corrected data, until the predictive error is below a predetermined threshold.

A method of coding data having a plurality of samples, comprising the steps of:

• generating compressed data having a plurality of samples by reducing a number of samples of original data;
• generating corrected data by adjusting a value of each sample of the compressed data;
• predicting the original data based on the corrected data to generate predicted data having a plurality of predicted samples;
• calculating, with respect to the original data, a predictive error of the predicted data;
• and
• determining suitability of the corrected data as coded data of the original data based upon the predictive error;
• wherein the steps of generating corrected data, predicting the original data, calculating a predictive error, and determining the suitability of the corrected data are repeated unless the predictive error is less than a predetermined threshold.

A method for decoding coded data generated by coding data, comprising the steps of:

• receiving the coded data;
• decoding the coded data and generating decoded data, wherein the coded data is generated by the steps of:
• generating compressed data having a plurality of samples by reducing a number of samples of original data;
• generating corrected data by adjusting a value of each sample of the compressed data;
• predicting the original data based on the corrected data to generate predicted data having a plurality of predicted samples;
• calculating, with respect to the original data, a predictive error of the predicted data;
• and
• determining suitability of the corrected data as coded data based upon the predictive error;
• wherein the steps of generating corrected data, predicting the original data, calculating a predictive error, and determining the suitability of the corrected data are repeated unless the predictive error is less than a predetermined threshold.

An apparatus for coding original data having a plurality of samples, comprising:

• a subsampling circuit for generating compressed data having a plurality of samples by reducing a number of samples of original data;
• a correcting circuit for generating corrected data by adjusting a value of each sample of the compressed data;
• a predicting circuit for predicting the original data based on the corrected data to generate predicted data having a plurality of predicted samples;
• a calculator for calculating, with respect to the original data, a predictive error of the predicted data;
• and
• a determining circuit for determining suitability of the corrected data as coded data based upon the predictive error;
• wherein the correcting circuit, the predicting circuit, the calculator, and the determining circuit operate repeatedly unless the predictive error is less than a predetermined threshold.

An apparatus for decoding coded data generated by coding original data, comprising:

• a circuit for receiving the coded data;
• a decoder for decoding the coded data and generating decoding data, wherein the coded data is generated by the steps of:
• generating compressed data having a plurality of samples by reducing a number of samples of said original data;
• generating corrected data by adjusting a value of each sample of the compressed data;
• predicting the original data based on the corrected data to generate predicted data having a plurality of predicted samples;
• calculating, with respect to the original data, a predictive error of the predicted data;
• and
• determining suitability of the corrected data as coded data based upon the predictive error;
• wherein the steps of correcting the compressed data, predicting the original data, calculating a predictive error, and determining the suitability of the corrected data are continually repeated unless the predictive error is less than a predetermined threshold.