Quantization scheme for JPEG baseline sequential encoding of still images
H.W. Paik, Aashish Khubchandani · 2003
A quantization scheme for discrete cosine transform (DCT) coefficients in the Joint Photographic Experts Group's (JPEGs) baseline sequential method for image compression is proposed. The DCT coefficients should be quantized to achieve maximum compression without degrading the visual image quality. The scheme is adaptive to the image characteristics and is statistical in nature. The results are evaluated in terms of compression, root-mean-square error, and subjective visual quality, 8-b/pixel monochrome images of size 512 * 512 have been compressed in the range 0.4-1 b/pixel with good to excellent quality.>