The RGB color retinal image has an interesting characteristic, i.e. The G channel contains more important information than the other ones. One of the most important features in a retinal image is the retinal blood vessel structure. Many diseases can be diagnosed based on in the retinal blood vessel, such as micro aneurysms that can lead to blindness. In the G channel, the contrast between retinal blood vessel and its background is significantly high. The authors explore this retinal image characteristic to construct a more suitable image coding system. The coding processes are conduct in three schemes: weighted R channel, weighted G channel, and weighted B channel coding. Their hypothesis is that allocating more bits in the G channel will improve the coding performance. The authors seek for image quality assessment (IQA) metrics that can be used to measure the distortion in retinal image coding. Three different metrics, namely Peak Signal to Noise Ratio (PSNR), Structure Similarity (SSIM), and Visual Information Fidelity (VIF) are compared as objective assessment in image coding and to show quantitatively that G channel has more important role compared to the other ones. The authors use Vector Quantization (VQ) as image coding method due to its simplicity and low-complexity than the other methods. Experiments with actual retinal image shows that the minimum value of SSIM and VIF required in this coding scheme is 0.9940 and 0.8637. Copyright © 2013, IGI Global.

Asymmetric Channel Coding,Color Retinal Image,Peak Signal to Noise Ratio (PSNR),Structure Similarity (SSIM),Vector Quantization (VQ),Visual Information Fidelity (VIF)

[{‘$’: ‘Andriyan Bayu Suksmono graduated with BS in physics, MS in electrical engineering from Institut Teknologi Bandung (ITB), and PhD in engineering from the University of Tokyo Japan, in 1985, 1996, and 2002 respectively. He joined the Department of Electrical Engineering, ITB in 1996 as an instructor. He became professor in the School of Electrical Engineering and Informatics, ITB, since 2010. He was on leave to NIME-Japan in 1998 with JSPS Fellowship grant scheme and to University of Tokyo in 2009 through Hitachi Research Fellowship. His main research interests are Signal processing, imaging, neural networks, and applied compressive sensing. Prof. Suksmono is a senior member of the IEEE.’}, {‘$’: ‘Agung Wahyu Setiawan would like to thank Directorate of Education & Graduate School of Institut Teknologi Bandung and Directorate General Higher Education – Ministry of Education and Culture, Republic of Indonesia for the generous scholarship support.’}]

https://doi.org/10.4018/jehmc.2013070101