A CMOS Image Sensor with combined adaptive-quantization and QTD-based on-chip compression processor

In this paper, a CMOS image sensor with on-chip compression processor is proposed. An adaptive quantization scheme based on boundary adaptation procedure followed by an on-line quadrant tree decomposition processing is proposed enabling low power, robust and compact image compression processor. The image sensor chip has been implemented using 0.35 mu CMOS technology and operates at 3.3 V. Simulation and experimental results show compression figures corresponding to 0.6-0.8 BPP, while maintaining reasonable PSNR levels and very low operating power consumption