A Low Power Image Sensor Controller and JPEG Encoder IC for Wireless Capsule Endoscopy
Keywords:
Discrete cosine transform (DCT), direct memory access (DMA), huffman coding, JPEG, image compressionAbstract
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
1.69 mW under 6 MHz system clock for VGA (640×480) image
resolution when compressing at 7.5 frames per second.
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