—In this paper, a low power CMOS image sensor controller and baseline JPEG compression encoder for wireless capsule endoscopy is presented. The proposed JPEG encoder can be integrated into a wireless capsule system to compresses the raster YCbCr 4:2:2 raw image data from image sensor into JPEG format file and then send to external receiver through wireless transmission. To achieve low power and high image compression ratio, the JPEG compression algorithm is optimized for biomedical image compression. The compressed image data are being packed into byte format and DMA can be used to retrieve the JPEG image. The JPEG image compression chip is designed using 0.18-μm CMOS technology. It consumes 1.69mW under 6 MHz system clock for VGA (640×480) image resolution when compressing at 7.5 frames per second.
Index Terms—Discrete cosine transform (DCT), direct memory access (DMA), huffman coding, JPEG, image compression.
W. D. Toh, B. Zhao, Y. Gao and M. Je are with the Institute of Microelectronics, 11 Science Park Road, Singapore Science park II, CO 117685.Singapore (e-mail: firstname.lastname@example.org).
C. H Heng is with the Department of Electrical and Computer Engineering, National University of Singapore, CO 119260 Singapore (e-mail: email@example.com).
Cite: Wei-Da Toh, Bin Zhao, Yuan Gao, Minkyu Je, and Chun-Huat Heng, "A Low Power Image Sensor Controller and JPEG Encoder IC for Wireless Capsule Endoscopy," International Journal of Information and Electronics Engineering vol. 3, no. 1, pp. 32-34, 2013.