The objective of this paper is to evaluate a set of wavelets for image compression. Image compression using wavelet transforms results in an improved compression ratio. Wavelet transformation is the technique that provides both spatial and frequency domain information. These properties of wavelet transform greatly help in identification and selection of significant and non-significant coefficients amongst the wavelet coefficients. DWT (Discrete Wavelet Transform) represents image as a sum of wavelet function (wavelets) on different resolution levels. So, the basis of wavelet transform can be composed of function that satisfies requirements of multiresolution analysis. The choice of wavelet function for image compression depends on the image application and the content of image. A review of the fundamentals of image compression based on wavelet is given here. This study also discussed important features of wavelet transform in compression of images. In this study we have evaluated and compared three different wavelet families i.e. Daubechies, Coiflets, Biorthogonal. Image quality is measured, objectively using peak signal-to-noise ratio, Compression Ratio and subjectively using visual image quality.
Finally, they evaluated and compared the compression performance of three different wavelet families (i.e., Daubechies, Coiflets, Biorthogonal) through measuring the image fidelity objectively (using peak signal-to-noise ratio) and subjectively (using visual image quality), beside to compression ratio REF .
JPEG Image Compression based on Biorthogonal, Coiflets and Daubechies Wavelet Families
International Journal of Computer Applications
Computer Science