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Image compression based on 2D Discrete Fourier Transform and matrix minimization algorithm

ARRAY 2020年 6卷

作者： Rasheed, Mohammed H. Salih, Omar M. Siddeq, Mohammed M. Rodrigues, Marcos A. Northern Tech Univ Tech Coll Kirkuk Comp Engn Dept Mosul Iraq Sheffield Hallam Univ Geometr Modeling & Pattern Recognit Res Grp Sheffield England

In the present era of the internet and multimedia, image compression techniques are essential to improve image and video performance in terms of storage space, network bandwidth usage, and secure transmission. A number of image compression methods are available with largely differing compression ratios and coding complexity. In this paper we propose a new method for compressing high-resolution images based on the Discrete Fourier Transform (DFT) and matrix minimization (MM) algorithm. The method consists of transforming an image by DFT yielding the real and imaginary components. A quantization process is applied to both components independently aiming at increasing the number of high frequency coefficients. The real component matrix is separated into Low Frequency Coefficients (LFC) and High Frequency Coefficients (HFC). Finally, the MM algorithm followed by arithmetic coding is applied to the LFC and HFC matrices. The decompression algorithm decodes the data in reverse order. A sequential search algorithm is used to decode the data from the MM matrix. Thereafter, all decoded LFC and HFC values are combined into one matrix followed by the inverse DFT. Results demonstrate that the proposed method yields high compression ratios over 98% for structured light images with good image reconstruction. Moreover, it is shown that the proposed method compares favorably with the JPEG technique based on compression ratios and image quality.

关键词： DFT matrix minimization algorithm Sequential search algorithm

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