Title :
A method for variable quantization in JPEG for improved text quality in compound documents
Author :
Konstantinides, Konstaritinos ; Tretter, Daniel
Author_Institution :
Stream Machine, Santa Clara, CA, USA
Abstract :
In this paper we present a JPEG-compliant method for the efficient variable quantization of compound documents. By measuring DCT activity in each of the 8×8 blocks, our scheme automatically detects the image parts and text parts of a document and adjusts the quantization scaling factors so that text blocks are compressed at higher quality than image blocks. Experimental results from three different quantization schemes are also reported
Keywords :
data compression; discrete cosine transforms; document image processing; image coding; transform coding; DCT activity; JPEG-compliant method; compound documents; image parts; quantization scaling factors; text parts; text quality; variable quantization; Discrete cosine transforms; Frequency domain analysis; Graphics; Huffman coding; Image coding; Image segmentation; Laboratories; Quantization; Streaming media; Transform coding;
Conference_Titel :
Image Processing, 1998. ICIP 98. Proceedings. 1998 International Conference on
Conference_Location :
Chicago, IL
Print_ISBN :
0-8186-8821-1
DOI :
10.1109/ICIP.1998.723524
