THEORETICAL INVESTIGATIONS OF UNSHARP MASKING BY USING OF ASYMMETRIC SCREEN-FILM SYSTEMS
نویسندگان
چکیده
منابع مشابه
Image Enhancement using Generalized Unsharp Masking Algorithm
Enhancement of contrast and sharpness of an image is required in many applications. Unsharp masking is a classical tool for sharpness enhancement. We propose a generalized unsharp masking algorithm using the exploratory data model as a unified framework. The proposed algorithm is designed to address three issues: 1) simultaneously enhancing contrast and sharpness by means of individual treatmen...
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With the advent of the programmable graphics pipeline, it has become possible to move expensive rendering processes to the GPU for real-time computation. The demand for realistic real-time rendering in games has led to the creation of GPU shaders that approximate global illumination. Our project is an implementation of one such approximation known as screen-space ambient occlusion (SSAO).
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The linear Unsharp Masking technique used in image contrast enhancement is modiied in this paper, by introducing a control term expressed as a rational function of the local input data. In this way, noise ampliication is avoided and, at the same time, overshoot eeects on sharp edges are limited. Experimental results support the validity of the method, even as a preprocessor for interpolation sy...
متن کاملA perceptual evaluation of 3D unsharp masking
Much research has gone into developing methods for enhancing the contrast of displayed 3D scenes. In the current study, we investigated the perceptual impact of an algorithm recently proposed by Ritschel et al. that provides a general technique for enhancing the perceived contrast in synthesized scenes. Their algorithm extends traditional image-based Unsharp Masking to a 3D scene, achieving a s...
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ژورنال
عنوان ژورنال: Japanese Journal of Radiological Technology
سال: 1995
ISSN: 0369-4305,1881-4883
DOI: 10.6009/jjrt.kj00001353399