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Image data compression apparatus, compression method and program, as well as image data restoration device, restore method and program

机译:图像数据压缩装置,压缩方法和程序,以及图像数据恢复装置,恢复方法和程序

摘要

Quantizer is to quantize the "prediction error" is the difference value of the predicted value X 'and compression target pixel X. As an input a quantization number obtained from the quantization table of the quantizer, a variable length encoder outputs the variable-length code (compressed code). Predicted value candidate calculation module sends a multiplexer (MPX) to calculate the predicted value candidate 1~k based peripheral pixels A, C, and B. Then determined based on the intermediate value and the image format correspondence table and intermediate values ​​correspondence table according to the image format whether to predicted value which of the predicted value candidate 1~k, predicted value determination module, a multiplexer (the control signal I want to send to the MPX). The multiplexer (MPX) outputs as a prediction value X 'to either of the predicted value candidate 1~k determined. By selectively using prediction value according to the image format in this way, it becomes possible to reduce the prediction error for each image format.
机译:量化器用于量化“预测误差”是预测值X'与压缩目标像素X的差值。作为输入,从量化器的量化表获得的量化数,可变长度编码器输出可变长度代码(压缩代码)。预测值候选计算模块发送多路复用器(MPX)以基于1〜k个外围像素A,C和B计算预测值候选。然后根据中间值和图像格式对应表以及中间值对应表确定根据图像格式是否为预测值,选择预测值候选1〜k中的一个,预测值确定模块,多路复用器(我要发送到MPX的控制信号)。多路复用器(MPX)将预测值X'输出到所确定的预测值候选1-k。通过以这种方式选择性地使用根据图像格式的预测值,可以减小每种图像格式的预测误差。

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