tailieunhanh - Báo cáo hóa học: " Research Article A Near-Lossless Image Compression Algorithm Suitable for Hardware Design in Wireless Endoscopy System"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article A Near-Lossless Image Compression Algorithm Suitable for Hardware Design in Wireless Endoscopy System | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 82160 13 pages doi 2007 82160 Research Article A Near-Lossless Image Compression Algorithm Suitable for Hardware Design in Wireless Endoscopy System Xiang Xie GuoLin Li and ZhiHua Wang Department of Electronic Engineering Tsinghua University Beijing 100084 China Received 12 September 2005 Revised 28 February 2006 Accepted 7 April 2006 Recommended by Liang-Gee Chen In order to decrease the communication bandwidth and save the transmitting power in the wireless endoscopy capsule this paper presents a new near-lossless image compression algorithm based on the Bayer format image suitable for hardware design. This algorithm can provide low average compression rate bits pixel with high image quality larger than dB for endoscopic images. Especially it has low complexity hardware overhead only two line buffers and supports real-time compressing. In addition the algorithm can provide lossless compression for the region of interest ROI and high-quality compression for other regions. The ROI can be selected arbitrarily by varying ROI parameters. In addition the VLSI architecture of this compression algorithm is also given out. Its hardware design has been implemented in pm CMOS process. Copyright 2007 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION Compared to the conventional endoscopy system the wireless capsule endoscopy allows us to directly study the entire small intestine and does not require any sedation anesthesia or insufflation of the bowel. There is the only clinic device made by Israel in the world 1 . However it can only work for less than eight hours generally it costs capsule about 10-48 h typically 24 h on moving from mouth to evacuation 1 and the image frame rate is slow 2 frames second which results in the fact that there is not enough time for the capsule to check the large intestine and some regions interesting