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4
Wavelet-Based Image Compression
4.1 Introduction
In Chapter 3, we studied how the discrete cosine transform (DCT) is used
for the compression of images. The basic properties of getting a higher com-
pression ratio include energy compaction and the de-correlation property of
the DCT. The JPEG lossy image compression standard that uses DCT suffers
through artifacts like blockiness and ringing, which degrade the quality of
the decompressed image.
In this chapter, we are going to study another transform called the
wavelet transform, which possesses properties like energy compaction and
de-correlation and is used in image compression, reducing a ...