Evaluation of image quality using dual-tree complex wavelet transform and compressive sensing

For the past two decades, wavelet based image compression algorithms for Wireless Sensor Network (WSN) has gained broad attention than that of the spatial based image compression algorithms. In that, Dual Tree Complex Wavelet Transforms (DTCWT) has provided better results in terms of image quality and high compression rate. However, the selection of DTCWT based image compressions for various WSN based applications is not practically suitable, due to the major limitations of WSN such as, low bandwidth, low energy consumption and storage space. Therefore, an attempt has been made in this paper to develop image compression through simulation by considering the modified block based pass parallel Set Partitioning In Hierarchical Trees (SPIHT) with Double Density Dual Tree Complex Wavelet Transform (DDDTCWT) for compressing the WSN based images. In addition, bivariate shrink method is also adopted with the DDDTCWT to obtain better image quality within less computation time. It is observed through simulation results that above mentioned proposed technique provides better performance than that of existing compression technique

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Compressive sensing MRI using dual tree complex wavelet transform with wavelet tree sparsity

2017 34th National Radio Science Conference (NRSC) ◽

10.1109/nrsc.2017.7893519 ◽

2017 ◽

Cited By ~ 1

Author(s):

Mohamed Ragab ◽

Osama A. Omer ◽

Hany S. Hussien

Keyword(s):

Wavelet Transform ◽

Compressive Sensing ◽

Complex Wavelet Transform ◽

Complex Wavelet

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Image Representation Method Based on Complex Wavelet Transform and Phase Congruency, with Automatic Threshold Selection

International Journal of Mathematics and Computers in Simulation ◽

10.46300/9102.2021.15.14 ◽

2021 ◽

Vol 15 ◽

pp. 79-83

Author(s):

T. Arathi ◽

Latha Parameswaran

Keyword(s):

Wavelet Transform ◽

Image Quality ◽

Image Representation ◽

Adaptive Method ◽

Input Image ◽

Phase Congruency ◽

Complex Wavelet Transform ◽

Complex Wavelet ◽

Representation Method

Image representation is an active area of research with increasing applications in military and defense. Image representation aims at representing an image with lesser number of coefficients than the actual image, without affecting the image quality. It is the first step in image compression. Once the image is represented by using some set of coefficients, it is further encoded using various compression algorithms. This paper proposes an adaptive method for image representation, which uses Complex Wavelet transform and the concept of phase congruency, where the number of coefficients used for image representation depends on the information content in the input image. The efficiency of the proposed method has been assessed by comparing the number of coefficients used to represent the image using the proposed method with that used when Complex Wavelet transform is used for image representation. The resultant image quality is determined by computing the PSNR values and Normalized Cross Correlation. Experiments carried out show highly promising results, in terms of the reduction in the number of coefficients used for image representation and the quality of the resultant image.

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