Image processing can be considered as an essential part of wide range
computer applications. This application deals with image coding and it discusses
image coding schemes, by using transforms to code the image or not. Huffman
coding and Run Length coding are not using transforms to code the image,
moreover, threshold coding and Zonal coding use transforms to code the image.
Two types of transforms, Discrete Cosine Transform (DCT) and Discrete Wavelet
Transform (DWT) have been used after segmenting the image into blocks, and
then Zonal coding algorithm or threshold coding algorithm is used to get the coded
image. Finally we conclude that using wavelet transform is better than other
transforms when it is used for image coding.