Title: An efficient sparse 8 × 8 orthogonal transform matrix for colour image compression

Authors: R.K. Senapati; U.C. Pati; K.K. Mahapatra

Addresses: Department of Electronics and Communication and Engineering, National Institute of Technology Rourkela, Rourkela 769008, India ' Department of Electronics and Communication and Engineering, National Institute of Technology Rourkela, Rourkela 769008, India ' Department of Electronics and Communication and Engineering, National Institute of Technology Rourkela, Rourkela 769008, India

Abstract: This paper presents an efficient orthogonal sparse 8 × 8 transform matrix for colour image compression particularly at lower bit rate applications. The transform matrix implemented in Xilinx XC2VP30 FPGA device indicates that a significant saving in computation and hardware resources over Discrete Cosine Transform (DCT), Signed Discrete Cosine Transform (SDCT), approximate DCT and matrix proposed by Bouguezel. By using various natural test images, it is demonstrated that the subjective and objective qualities are comparable with the above-mentioned transforms at lower bit rates. Furthermore, it outperforms SDCT by a large margin almost at all bit rates for most of the images.

Keywords: SDCT; signed discrete cosine transform; image compression; PEEN; percentage error energy norm; SSIM; structural similarity index metric; orthogonal transform matrix; colour images; lower bit rates.

DOI: 10.1504/IJSISE.2013.051502

International Journal of Signal and Imaging Systems Engineering, 2013 Vol.6 No.1, pp.16 - 23

Received: 05 Feb 2011
Accepted: 09 Apr 2011
Published online: 20 Jan 2013 *

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