RED DATA DETECTOR FOR PICTURE DATA COMPRESSION DEVICE

摘要

A picture data compressing device in which picture data is divided by a blocking circuit 1 into plural blocks each consisting of a pre-set number of pixels and shuffled by a shuffling circuit 2, with the blocked and shuffled data being transformed by a DCT circuit 3 into data on the frequency domain and re-quantized by a quantization circuit 4 for compressing the picture data. A red detector 6 decides whether or not a block from the shuffling circuit 2 is the red-based block. If the red detector 6 finds the block to be a red-based block, a controller 7 controls the quantization circuit 4 so that the quantization step of the quantization circuit 4 will become finer. The picture data of the red-based block susceptible to block distortion may be quantized with a finer quantization step for improving reproducibility and alleviating block distortion.