Patent ID: 6353685
Filing Date: 2002-03-05
Classification: G06T

Abstract:
An image compression apparatus for compressing image data provided to an input terminal and providing compressed data to an output terminal, comprising:a 4Ã—4 weighted digital cosine transformer (DCT) coupled to the input terminal and configured to convert the image data into weighted frequency data, wherein the 4Ã—4 weighted DCT is divided into a two-dimensional DCT for processing; a zigzag circuit coupled to the DCT and configured to zigzag process the frequency data and generate create zigzag data; a Q-factor estimator coupled to the DCT and configured to estimate the frequency data and generate a Q-factor; a DC coding circuit coupled to the zigzag circuit and configured to code the zigzag data and generate a DC code; a quantization circuit coupled to the zigzag circuit and the Q-factor estimator and configured to quantize the zigzag data based on the Q-factor and generate quantized data; and a coding circuit coupled to the DC coding circuit and the quantization circuit and configured to encode the quantized data to create variable length data as the compressed data to the output terminal.