Analysis of JPEG encoder for image compression

This paper covers analysis of JPEG standard which is based on discrete cosine transform(DCT). In the standard, the procedure, DCT, played the important role of separating information by different frequencies. Compression was achieved by quantization and coding. There were common fast DCT algorithms analyzed. These could be contribution in efficient JPEG encoder. The other procedures, quantization and coding, were demonstrated and the processings of the last two procedures are mainly achieved based on standard processing table. Therefore, enhancing the efficiency of JPEG codec is hardly to develop the algorithm of quantization and coding. At last, the compression encoder was established based on JPEG, and the performance of compressed image was presented at last.