A Comparison between the 2D Real-valued and the Complex-valued Discrete Gabor Transforms
In this paper, we introduced the fast 2D real-valued discrete Gabor transform(RDGT) proposed in our previous work, and the relationship between the coefficients the 2D RDGT and the 2D complex-valued discrete Gabor transform (CDGT).To obtain a numeral comparison of the degree of image data decorrelation,we also performed an entropy computation of both transform coefficients under various effective window width conditions. The comparison results point out that the 2D RDGT is more suitable for image compression than the 2D CDGT.