Renu Sharma, Madhu Jain, Journal of Information Processing Systems Vol. 17, No. 6, pp. 1170-1178, Dec. 2021  

https://doi.org/10.3745/JIPS.03.0170
Keywords: Contrast Enhancement, Dual Tree Complex Wavelet Transform, Resolution Enhancement, Singular ValueDecomposition
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Abstract

This paper proposed a versatile algorithm based on a dual-tree complex wavelet transform for intensifying the visual aspect of medical images. First, the decomposition of the input image into a high sub-band and low-subband image is done. Further, to improve the resolution of the resulting image, the high sub-band image is interpolated using Lanczos interpolation. Also, contrast enhancement is performed by singular value decomposition (SVD). Finally, the image reconstruction is achieved by using an inverse wavelet transform. Then, the Gaussian filter will improve the visual quality of the image. We have collected images from the hospital and the internet for quantitative and qualitative analysis. These images act as a reference image for comparing the effectiveness of the proposed algorithm with the existing state-of-the-art. We have divided the proposed algorithm into several stages: preprocessing, contrast enhancement, resolution enhancement, and visual quality enhancement. Both analyses show the proposed algorithm's effectiveness compared to existing methods.

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