JPEG based image compression with adaptive resolution conversion system

It is well known that the standard JPEG algorithm causes visually disturbing blocking effects when we obtain a high compression ratio image. In order to obtain a better quality image with high compression ratio, we propose a new image compression method, which is combined with the standard JPEG and an adaptive resolution conversion. Since the resolution conversion can reduce the image data, the proposed hybrid method is realized smaller quantization parameter than the standard JPEG, and we obtain a high quality decoded image. In the proposed method, compression is performed by two factors as the quantization and the resolution conversion. We study how to adjust two factors. The proposed method archives high quality image compression only adding the small system to the JPEG.