Patent ID: 6075897
Filing Date: 2000-06-13
Classification: G06T

Abstract:
An image compression apparatus comprising:orthogonal transforming means for orthogonally transforming image data to obtain a transformation coefficient;quantizing means for quantizing the transformation coefficient by using a quantization table to obtain quantized data;switching means for providing a selected one of an output of said orthogonal transforming means and an output of said quantizing means as an output of said switching means, wherein said switching means performs such a selection every n blocks, where n is a natural number;first storage means for storing the output of said switching means as stored data;controlling means for controlling a reading-out operation of said first storage means to read out the stored data;compression-coding means for compression-coding the data read out from said first storage means to obtain coded data; andsecond storage means for storing the coded data,wherein said controlling means controls the reading-out operation of said first storage means based on a condition of said second storage means.