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Izvorni znanstveni članak
https://doi.org/10.31803/tg-20191104185229

Contrast and color balance enhancement for non-uniform illumination retinal images

Preecha Vonghirandecha   ORCID icon orcid.org/0000-0002-8673-793X ; Prince of Songkla University, 15 Kanjanavanich, 90110, Hatyai, Songkhla, Thailand
Montri Karnjanadecha ; Prince of Songkla University, 15 Kanjanavanich, 90110, Hatyai, Songkhla, Thailand
Sathit Intajag ; Prince of Songkla University, 15 Kanjanavanich, 90110, Hatyai, Songkhla, Thailand

Puni tekst: engleski, pdf (2 MB) str. 291-296 preuzimanja: 299* citiraj
APA 6th Edition
Vonghirandecha, P., Karnjanadecha, M. i Intajag, S. (2019). Contrast and color balance enhancement for non-uniform illumination retinal images. Tehnički glasnik, 13 (4), 291-296. https://doi.org/10.31803/tg-20191104185229
MLA 8th Edition
Vonghirandecha, Preecha, et al. "Contrast and color balance enhancement for non-uniform illumination retinal images." Tehnički glasnik, vol. 13, br. 4, 2019, str. 291-296. https://doi.org/10.31803/tg-20191104185229. Citirano 25.06.2021.
Chicago 17th Edition
Vonghirandecha, Preecha, Montri Karnjanadecha i Sathit Intajag. "Contrast and color balance enhancement for non-uniform illumination retinal images." Tehnički glasnik 13, br. 4 (2019): 291-296. https://doi.org/10.31803/tg-20191104185229
Harvard
Vonghirandecha, P., Karnjanadecha, M., i Intajag, S. (2019). 'Contrast and color balance enhancement for non-uniform illumination retinal images', Tehnički glasnik, 13(4), str. 291-296. https://doi.org/10.31803/tg-20191104185229
Vancouver
Vonghirandecha P, Karnjanadecha M, Intajag S. Contrast and color balance enhancement for non-uniform illumination retinal images. Tehnički glasnik [Internet]. 2019 [pristupljeno 25.06.2021.];13(4):291-296. https://doi.org/10.31803/tg-20191104185229
IEEE
P. Vonghirandecha, M. Karnjanadecha i S. Intajag, "Contrast and color balance enhancement for non-uniform illumination retinal images", Tehnički glasnik, vol.13, br. 4, str. 291-296, 2019. [Online]. https://doi.org/10.31803/tg-20191104185229

Sažetak
Color retinal images play an important role in supporting a medical diagnosis. However, some retinal images are unsuitable for diagnosis due to the non-uniform illumination. In order to solve this problem, we propose a method for improving non-uniform illumination that can enhance the image quality of a color fundus photograph suitable for reliable visual diagnosis. Firstly, a hidden anatomical structure in dark regions of the retinal images is revealed by improving the image luminosity with gamma correction. Secondly, multi-scale tone manipulation is then used to adjust the image contrast in the lightness channel of L*a*b* color space. Finally, color balance is adjusted by specifying the image brightness based on Hubbard’s specification. The performance of the applied method has been evaluated against the data from the DIARETDB1 dataset. The results obtained show that the proposed algorithm performs well for correcting the non-uniform illumination of color retinal images.

Ključne riječi
human visual perception; image contrast and color balance enhancement; non-uniform illumination; retinal image

Hrčak ID: 229497

URI
https://hrcak.srce.hr/229497

Posjeta: 469 *