DCT-based a new approach of improving image coder performance using the spatial reconstructing noise shaping

A modification of the DCT based coding system is proposed that allows to suppress the reconstruction noise in the frequency bands where it is less visible. The modified coder is compatible with the standard DCT system. A 1-D noise feedback filter is proposed which has been designed from the human visual system. The result shows that with noise feedback, the quantization noise can be flexibly controlled. Our method does not require any modification at the decoder. Therefore, it can easily be incorporated into a coder for any of the existing DCT-based standards (JPEG, H.261, MPEG)