Homomorphic restoration of images degraded by light cloud cover

Peli, Tamar; Quatieri, Thomas F.

doi:10.1109/icassp.1984.1172759

Cited by 6 publications

(1 citation statement)

References 8 publications

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“…The Homomorphic filtering method is a well technique for image enhancement and has been employed in various applications [1,2]. It produces simultaneous dynamic range compression and contrast enhancement [3][4][5][6].…”

Section: Introduction Introduction Introductionmentioning

confidence: 99%

A Fuzzy Homomorphic Algorithm for Image Enhancement

Nnolim

2014

Nig. J. Tech.

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The implementation and analysis of a novel Fuzzy Homomorphic image enhancement technique is presented. The he implementation and analysis of a novel Fuzzy Homomorphic image enhancement technique is presented. The he implementation and analysis of a novel Fuzzy Homomorphic image enhancement technique is presented. The he implementation and analysis of a novel Fuzzy Homomorphic image enhancement technique is presented. The technique technique technique technique combines the logarithmic transform with fuzzy membership functions to deliver an intuitive method of combines the logarithmic transform with fuzzy membership functions to deliver an intuitive method of combines the logarithmic transform with fuzzy membership functions to deliver an intuitive method of combines the logarithmic transform with fuzzy membership functions to deliver an intuitive method of image enhancement. This algorithm reduces the computational complexity by eliminating the need for image image enhancement. This algorithm reduces the computational complexity by eliminating the need for image image enhancement. This algorithm reduces the computational complexity by eliminating the need for image image enhancement. This algorithm reduces the computational complexity by eliminating the need for image dependent filter kernels and the forward and dependent filter kernels and the forward and dependent filter kernels and the forward and dependent filter kernels and the forward and with the more established algorithms with the more established algorithms with the more established algorithms with the more established algorithms for the enhancement of low contrast images with uneven illumination for the enhancement of low contrast images with uneven illumination for the enhancement of low contrast images with uneven illumination for the enhancement of low contrast images with uneven illumination results show that the fuzzy method provides similar or better results than results show that the fuzzy method provides similar or better results than results show that the fuzzy method provides similar or better results than results show that the fuzzy method provides similar or better results than other well other well other well other well-known image enhancement algorithms. known image enhancement algorithms. known image enhancement algorithms. known image enhancement algorithms.

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Section: Introduction Introduction Introductionmentioning

confidence: 99%

A Fuzzy Homomorphic Algorithm for Image Enhancement

Nnolim

2014

Nig. J. Tech.

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Enhancement of Fundus Photographs Taken Through Cataracts

Peli

Schwartz

1987

Ophthalmology

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Restoration of retinal images obtained through cataracts

Peli

1989

IEEE Trans. Med. Imaging

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An optical model for imaging the retina through cataracts has been developed. The images are treated as sample functions of stochastic processes. On the basis of the model a homomorphic Weiner filter can be designed that will optimally restore the cataractous image (in the mean-square-error sense). The design of the filter requires a priori knowledge of the statistics of either the cataract transmittance function or the noncataractous image. The cataract transmittance function, assumed to be low pass in nature, can be estimated from the cataractous image of the retina. The statistics of the noncataractous image can be estimated using an old, precataractous photograph of the same retina, which is frequently available. Various modes of this restoration concept were applied to clinical photographs and found to be effective. The best results were obtained with short-space enhancement using averaged short-space estimates of the spectra of the two images.

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Homomorphic restoration of images degraded by light cloud cover

Cited by 6 publications

References 8 publications

A Fuzzy Homomorphic Algorithm for Image Enhancement

A Fuzzy Homomorphic Algorithm for Image Enhancement

Enhancement of Fundus Photographs Taken Through Cataracts

Restoration of retinal images obtained through cataracts

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