منابع مشابه
Enhancing Texture Analysis by Color Shading Correction
The automated analysis and classification of textured regions in color images is an active field of research in image processing and pattern recognition. However, most of the published algorithms require ideal imaging conditions with respect to homogenous illumination conditions or calibrated recording devices. In this work we propose a YUVbased shading correction technique applicable to color ...
متن کاملRetrospective Shading Correction: Problem, Methods, and Evaluation
In this paper we address the problem of retrospective shading correction, which is a necessary pre-processing step in many tasks of image analysis. Eight algorithms are implemented and compared. The performance of the algorithms was analysed firstly; on three sets of differently structured synthetic shaded and shading-free images, and secondly; on two sets of real microscopical images acquired ...
متن کامل7 Lens Shading Correction for Dirt Detection
We present a novel inspection framework to detect dirt and blemish in production line of optical fabrication automatically. To detect dirt defect from vignette surface, we use B-Spline to generate an ideal vignette surface and subtract the contaminated surface from the generated vignette surface to locate the defect. Besides, we apply some image processing methods to optimize our inspection fra...
متن کاملSelf-shading correction for oceanographic upwelling radiometers.
We present the derivation of an analytical model for the self-shading error of an oceanographic upwelling radiometer. The radiometer is assumed to be cylindrical and can either be a profiling instrument or include a wider cylindrical buoy for floating at the sea surface. The model treats both optically shallow and optically deep water conditions and can be applied any distance off the seafloor....
متن کاملSurface radiance correction for shape from shading
It is well known that many surfaces exhibit reflectance that is not well modelled by Lambert’s law. This is the case not only for surfaces that are rough or shiny, but also those that are matte and composed of materials that are particle suspensions. As a result, standard Lambertian shape-from-shading methods can not be applied directly to the analysis of rough and shiny surfaces. In order to o...
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ژورنال
عنوان ژورنال: Journal of Histochemistry & Cytochemistry
سال: 1974
ISSN: 0022-1554,1551-5044
DOI: 10.1177/22.7.751