Hybrid transform coding scheme for medical image application

Review on Transform Based Medical Image Compression

“…It offers numerous benefits over current compression methods, including the ability to do both lossless and lossy compression, the ability to obtain higher image quality and higher compression ratios, and the ability to view the same file at multiple resolutions. Wavelets are good at isolating the discontinuities at edge points, but will not see the smoothness along the contours [7].…”

“…In this work, the compression process is done at 10% and 20% remaining rate. [7] present a scheme for medical image compression based on hybrid compression technique (DWT and DCT). The goal is to achieve higher compression rates by applying different compression thresholds for the wavelet coefficients of each DWT band (LL and HH) while DCT transform is applied on (HL and LH) bands with preserving the quality of reconstructed medical image.…”

“…The reconstructed image is obtained by applying the inverse steps of coding process. [7] present a new Contourlet based lossy image compression method for medical ultrasound images. In this algorithm Contourlet transform for image decomposition is used.…”

“…In this algorithm Contourlet transform for image decomposition is used. In [7] Contourlet transform is used to decompose the image into coefficients. After decomposition, a threshold is chosen from Contourlet coefficients.…”

“…However, two measurement methods have dominated the assessment of medical image quality, which are computable objective distortion measure and subjective quality as measured by psychophysical tests [7]. The objective quality of a reconstructed image could be measured by the Peak Signal to Noise Ratio (PSNR) between the original and reconstructed images.…”