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This paper presents a high-speed CMOS image sensor with on-chip parallel image compression circuits. The chip consists of a pixel array, an A/D converter array with noise canceling function and an image compression processing element array and buffer memories. The image compression processing element is implemented with a 4times4 point discreate cosine transform(DCT) and a modified zigzag scanner with 4 blocks. A prototype high-speed CMOS image sensor integrating the image compression circuits is implemented based on 1-poly 5-metal 0.25-mum CMOS technology. Image encoding using the implemented parallel image compression circuits to the image captured by the high-speed image sensor is successfully performed at 3,000[frame/s].