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Color image quality evaluation for impulse noise suppressing


A.L. Priorov, V.V. Khryashchev, E.A. Pavlov, N.B. Gerasimov, A.M. Shemyakov

In many practical applications images are corrupted by noise caused either by faulty image sensors or due to transmissions corruption resulting from artificial or natural phenomena. Transmission noise, also known as salt-and-pepper noise in grey-scale imaging, is modeled by an impulsive distribution. However, a problem in the study of the effect of the noise in the image processing community is the lack of commonly accepted multivariate impulse noise model. A number of simplified models have been introduced recently, to assist the performance evaluation of the different color image filters. Based on trichromatic color theory, color pixels are encoded as three scalar values, namely, red, green and blue (RGB color space). Since each individual channel of a color image can be considered as a monochrome image, traditional nonlinear image filtering techniques have involved the application of scalar filters on each channel separately. However, this disrupts the correlation that exists between the color components of natural images. As such the color noise model should be considered as a 3-channel perturbation vector in color space. The main approach for impulse noise removing is to use median-based filters. However, these nonlinear filters also tend to modify pixels that are not affected by the noise. In addition, when impulse noise probability is high, they are prone to edge jitter, so that details and edges of the original image are usually blurred by the filter. In order to improve performance of median-based filter approach, various decision-based filters have been proposed, where possible impulse noise pixels are first identified and then replaced by using median filter. The examples of decision-based filters for random-valued impulse noise removal from grayscale images are: adaptive center-weighted median filter and directional weighted median filter. These filters are good in locating the noise even in the case of high noise probability. In this paper authors introduce a novel filter for the purpose of random-valued impulse noise removal from RGB-color images which utilizes the advantages of both weighted vector median and decision-making filtration schemes.

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