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An automatic algorithm of degraded color document image enhancement is proposed based on our previous work on Natural Rendering of Color Image using Retinex (NRCIR) with respects to document image characteristics. In the proposed work, an adaptive workflow is designed to enhance both luminance and chrominance contrast of document image while maintaining degradations within tolerance and hue-shift...
A new method for Natural Rendering of Color Image based on Retinex (NRCIR) is proposed. Here, the word ??natural?? means that the ambience of image (warm or cold color impression) should not be changed after enhancement. Furthermore, the treatment should not introduce any additional light sources and should not produce halo effect or amplify blocking effect. Inspired by Retinex theory and histogram...
Many researchers have studied the issue of image defogging and enhancement, but there is no objective criterion to evaluate the defogging results. Based on the visual differences of images before and after defogging, valid edge intensity is defined to denote the detail performance of image, and color intensity in CIELAB color space is defined to denote the color performance of image. At last, the...
In this paper, an underwater image enhancement method using quaternions is presented. This work aims to improve color rendition and contrast of the objects, as if the scene has been taken out of water. This method is based on light attenuation inversion after processing a color space contraction using quaternions. Applied to the white, the attenuation gives a hue vector characterizing the water color...
Retinal images are widely used to manually or automatically detect and diagnose many diseases. Due to the complex imaging setup, there is a large luminosity and contrast variability within and across images. Here, we use the knowledge of the imaging geometry and propose an enhancement method for colour retinal images, with a focus on contrast improvement with no introduction of artifacts. The method...
In this paper, the usage of the YCbCr transformation in the input stage of a Face Recognition (FR) system is examined. Chromatic sampling ratios used in MPEG standards have been applied on the input face images to examine a possible integration of video and FR systems. Experiments were conducted in a number of learning scenarios and imaging conditions, and it was observed that almost all the YCbCr...
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