Patent ID: 6047089
Filing Date: 2000-04-04
Classification: G06T

Abstract:
An image compression device, comprising:a two-dimensional discrete cosine transformation (two-dimensional DCT) processor that processes original image data to obtain a DCT coefficient for each spatial frequency;first and second quantization tables composed of predetermined quantization coefficients to obtain quantized DCT coefficients, said first quantization table being different from said second quantization table;a quantization processor that quantizes said DCT coefficients by said first quantization table independent of the nature of said original image data;an encoding processor that encodes said quantized DCT coefficients to obtain compressed image data;a recording processor that records said compressed image data in an image recording area of a recording medium;a first table recording processor that records said first quantization table in a first table recording area of said recording medium;a second table recording processor that records said second quantization table, in a second table recording area of said recording medium; andan information recording processor that records mode information implying that said second quantization table is recorded in said recording medium, in an information recording area of said recording medium.