Patent
System and method of corner noise reduction in an image
Yunqiang Chen,Xiaoyun Jiang +1 more
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TLDR
In this article, a radial distance-based look up table is used to calibrate a noise property change due to the vignette effect, and a spatial varying noise reduction level is computed to correct the noise property distortion due to image vignetting.Abstract:
Systems and methods for reducing noise artifacts in an image are disclosed. A radial distance-based look up table may be used to calibrate a noise property change due to the vignette effect. Based on the look up table, a spatial varying noise reduction level is computed to correct the noise property distortion due to the image vignetting.read more
Citations
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Dynamically determining filtering strength for noise filtering in image processing
TL;DR: In this paper, a filter strength model was proposed to dynamically determine filtering strengths for noise filtering of image data. But the model is not suitable for image classification and it cannot be used for image segmentation.
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Method and apparatus for determining lens shading correction for a multiple camera device with various fields of view
TL;DR: In this article, a method and apparatus can determine lens shading correction for a multiple camera device with various fields of view, where a flat-field image can be captured using a first camera having a first lens for the multiple camera devices.
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Image upscaling with controllable noise reduction using a neural network
TL;DR: In this paper, the neural network determines a network parameter based on the noise reduction level and removes one or more of the noise artifacts from the low resolution image during the converting by the using the network parameter.
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Efficient radial lens shading correction
TL;DR: In this paper, a lens shading correction algorithm was proposed for the captured image based on applying different subsets of the numerical constants associated with channels of a captured image represented by a pixel array from a memory.
References
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Journal ArticleDOI
A new algorithm for unsupervised global and local color correction
TL;DR: A new algorithm for digital images unsupervised enhancement with simultaneous global and local effects, called ACE for Automatic Color Equalization, based on a computational model of the human visual system that merges the two basic "Gray World" and "White Patch" global equalization mechanisms.
Journal ArticleDOI
Robust Radiometric Calibration and Vignetting Correction
Seon Joo Kim,Marc Pollefeys +1 more
TL;DR: A full radiometric calibration algorithm that includes robust estimation of the radiometric response function, exposures, and vignetting is proposed and verified with both synthetic and real data, which shows significant improvement compared to existing methods.
Journal ArticleDOI
Single-Image Vignetting Correction
TL;DR: This method is designed to handle both textured and untextured regions in order to maximize the use of available information and capitalizes on the frequency characteristics and physical properties of vignetting to distinguish it from other sources of intensity variation.
Patent
Method and apparatus for improving low-light performance for small pixel image sensors
TL;DR: In this paper, a rolling sum of pixel values from a captured image is computed by selecting successive groups of the pixel values, each grouping comprising N×M pixel values and summing pixel values in each of the successive groupings, and forming an output image using the summed pixel values.
Patent
Locally adapted histogram equalization
TL;DR: In this paper, a method for improving the uniformity in exposure and tone of a digital image using a locally adapted histogram equalization approach is presented. But, the method is not suitable for outdoor scenes.