Host: The Institute of Image Electronics Engineers of Japan
Co-host: The Institute of Image Information and Television Engineers
In this paper, we present a lossy image coding method based on a variable density sampling. In a DCT based coding scheme such as JPEG, large deterioration may be caused in the high frequency domain of the encoded image at low bit rate, because bit assignments for high frequencies are rather few. In our proposed method, the back ground region of the image is down-sampled by reducing the sampling rate and the object region which has much high frequency components is up-sampled by linear interpolation. Thus the number of pixels of the back ground region is reduced and the frequency of the object region can be dropped to lower one. Consequently the degradation of the image quality in the object region can be suppressed.