Content-adaptive color transform for image compression

In this paper, an adaptive color transform for image compression is introduced. In each block of the image coefficients of the color transform are determined from the previously compressed neighboring blocks using weighted sums of the RGB pixel values, making the transform block-specific. There is no need to transmit or store the transform coefficients because they are estimated from previous blocks. The compression efficiency of the transform is demonstrated using the JPEG image coding scheme. In general, the suggested transformation results in better PSNR values for a given compression level.

[1]  Gregory K. Wallace,et al.  The JPEG still picture compression standard , 1991, CACM.

[2]  Detlev Marpe,et al.  An adaptive color transform approach and its application in 4∶4∶4 video coding , 2006, 2006 14th European Signal Processing Conference.

[3]  Moshe Porat,et al.  On color transforms and bit allocation for optimal subband image compression , 2007, Signal Process. Image Commun..

[4]  Hubert Cardot,et al.  Cooperation of color pixel classification schemes and color watershed: a study for microscopic images , 2002, IEEE Trans. Image Process..

[5]  T. Kanade,et al.  Color information for region segmentation , 1980 .

[6]  W. Pratt.  Spatial Transform Coding of Color Images , 1971 .

[7]  Yap-Peng Tan,et al.  Edge-preserving image denoising via optimal color space projection , 2006, IEEE Transactions on Image Processing.

[8]  Gaurav Sharma,et al.  Digital color imaging , 1997, IEEE Trans. Image Process..

[9]  A. Enis Çetin,et al.  Adaptive polyphase subband decomposition structures for image compression , 2000, IEEE Trans. Image Process..

[10]  Jerry D. Gibson,et al.  Digital coding of waveforms: Principles and applications to speech and video , 1985, Proceedings of the IEEE.

[11]  Ying Chen,et al.  Optimal Transform in Perceptually Uniform Color Space and Its Application in Image Coding , 2004, ICIAR.

[12]  T. Moon,et al.  Mathematical Methods and Algorithms for Signal Processing , 1999 .

[13]  A. Enis Çetin,et al.  Compression of Images in CFA Format , 2006, 2006 International Conference on Image Processing.

[14]  A. Enis Çetin,et al.  A 2-D orientation-adaptive prediction filter in lifting structures for image coding , 2006, IEEE Transactions on Image Processing.

[15]  Moshe Porat,et al.  Correlation-based approach to color image compression , 2007, Signal Process. Image Commun..