Patent ID: 7702161
Filing Date: 2010-04-20
Classification: H04N

Abstract:
1. In a compression unit of a compression encoder comprising a video capture unit for receiving an image data and dividing a component of said image data into a plurality of image data blocks, a method of image compression comprising the steps of: implementing a first transformation on each said image data block to generate first transformation coefficients by means of a first transformation unit; implementing a low quality quantization of said first transformation coefficients by means of a first quantization unit; entropy-encoding said low quality quantization of said first transformation coefficients by means of a first Huffman encoder; dequantizing said low quality quantization of said first transformation coefficients by means of a dequantization unit; implementing an inverse transformation of said dequantization of said first transformation coefficients to generate a reconstructed image data block by means of an inverse transformation unit; implementing image transformation and convolution to generate an image data difference between said image data block and said reconstructed image data block by means of a delta unit; implementing a second transformation on said image data difference to generate a second transformation coefficients by means of a second transformation unit; implementing a high quality quantization of said second transformation coefficients by means of a second quantization unit; and entropy-encoding said high quality quantization of said second transformation coefficients by means of a second Huffman encoder.