Title :
A JPEG variable quantization method for compound documents
Author :
Konstantinides, K. ; Tretter, Dan
Author_Institution :
Stream Machine, San Jose, CA
fDate :
7/1/2000 12:00:00 AM
Abstract :
We present a JPEC-compliant method for the efficient compression of compound documents using variable quantization, based on the DCT activity of each 8×8 block, our scheme automatically adjusts the quantization scaling factors so that test blocks are compressed at higher quality than image blocks. Results from three different quantization mappings are also reported
Keywords :
code standards; data compression; discrete cosine transforms; document image processing; image coding; image segmentation; quantisation (signal); telecommunication standards; transform coding; DCT activity; JPEG variable quantization method; compound documents; efficient compression; image quality; image segmentation; quantization mappings; quantization scaling factors adjustment; test blocks compression; Discrete cosine transforms; Huffman coding; Image coding; Image resolution; Image segmentation; Material storage; Pixel; Q factor; Quantization; Transform coding;
Journal_Title :
Image Processing, IEEE Transactions on
