A combined-transform coding (CTC) scheme for medical images

• Published in: IEEE transactions on medical imaging Vol. 11; no. 2; pp. 196 - 202
• Main Authors: Zhang, Y.-Q., Loew, M.H., Pickholtz, R.L.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.06.1992; Institute of Electrical and Electronics Engineers
• Subjects: Biological and medical sciences; Biomedical imaging; Discrete cosine transforms; Image coding; Investigative techniques, diagnostic techniques (general aspects); Magnetic resonance imaging; Medical diagnostic imaging; Medical sciences; Miscellaneous. Technology; Picture archiving and communication systems; Radiodiagnosis. Nmr imagery. Nmr spectrometry; Signal to noise ratio; Transform coding; Working environment noise; X-ray imaging; Performance evaluation; Correlation; Associated technique; Transformation; Computer simulation; Artefact; Information; Nuclear magnetic resonance imaging; Cosine transform; Result; Walsh transformation; Coding; Stochastic theory; Medical application; Comparative study
• ISSN: 0278-0062; 1558-254X
• DOI: 10.1109/42.141643

A combined-transform coding (CTC) scheme is proposed to reduce the blocking artifact of conventional block transform coding and hence to improve the subjective performance. The proposed CTC scheme is described and its information-theoretic properties are investigated. Computer simulation results for a class of chest X-ray images are presented. A comparison between the CTC scheme and the conventional discrete cosine transform (DCT) and discrete Walsh-Hadamard transform (DWHT) demonstrates the performance improvement of the proposed scheme. In addition, combined coding can also be used in noiseless coding, yielding a slight improvement in the compression performance if it is used properly.< >