Method for speeding up JPEG quantization operations in image com

Details Method for speeding up JPEG quantization operations in image com Method for speeding up JPEG quantization operations in image com

1997-11-18

1999-12-28

Tran, Phuoc

Image analysis

Image compression or coding

Quantization

382250, G06K 936

Patent

active

060092076

ABSTRACT:
A method for speeding up JPEG quantization operations in image compression for discrete cosine transform encoding operations in JPEG image compression. The quantization calculations are performed to obtain descriptors for Huffman encoding. The quantization calculations utilize a modified quantization table which is derived from an original quantization table by inversing each element of the original quantization table and then mutiplying 2.sup.n and then rounding off. The matrix composed by discrete cosine transform coefficients multiplies the modified quantization table to derive a new matrix. Then, each element of the new matrix is right shifted n bits to derive quantized discrete cosine transform coefficients. Then, Huffman encoding is performed to accomplish discrete cosine transform encoding.

REFERENCES:
Pennebaker and Mitchell, "JPEG still image data compression standard", Van Nostrand Reihold, N.-Y., pp. 344,345, and 381-386, 1993.

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