tps

Thin-Plate Spline Illumination Estimation Automatic White Balancing Method

https://github.com/sfu-cs-vision-lab/tps

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Keywords

camera-calibration color color-constancy color-measurement color-vision digital-image-processing illumination image-registration interpolation light-sources neural-networks vision visual-optics
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Thin-Plate Spline Illumination Estimation Automatic White Balancing Method

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camera-calibration color color-constancy color-measurement color-vision digital-image-processing illumination image-registration interpolation light-sources neural-networks vision visual-optics
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README.md

Thin-Plate Spline Illumination Estimation Automatic White Balancing Method

Open in MATLAB Online

Abstract

Thin-plate spline interpolation is used to interpolate the chromaticity of the color of the incident scene illumination across a training set of images. Given the image of a scene under unknown illumination, the chromaticity of the scene illumination can be found from the interpolated function. The resulting illumination-estimation method can be used to provide color constancy under changing illumination conditions and automatic white balancing for digital cameras. A thin-plate spline interpolates over a nonuniformly sampled input space, which in this case is a training set of image thumbnails and associated illumination chromaticities. To reduce the size of the training set, incremental k medians are applied. Tests on real images demonstrate that the thin-plate spline method can estimate the color of the incident illumination quite accurately, and the proposed training set pruning significantly decreases the computation.

Citation

@article{Shi:11, author = {Lilong Shi and Weihua Xiong and Brian Funt}, journal = {J. Opt. Soc. Am. A}, keywords = {Digital image processing; Vision, color, and visual optics ; Color; Color, measurement ; Color vision; Camera calibration; Illumination; Image registration; Interpolation; Light sources; Neural networks}, number = {5}, pages = {940--948}, publisher = {Optica Publishing Group}, title = {Illumination estimation via thin-plate spline interpolation}, volume = {28}, month = {May}, year = {2011}, url = {https://opg.optica.org/josaa/abstract.cfm?URI=josaa-28-5-940}, doi = {10.1364/JOSAA.28.000940}, abstract = {Thin-plate spline interpolation is used to interpolate the chromaticity of the color of the incident scene illumination across a training set of images. Given the image of a scene under unknown illumination, the chromaticity of the scene illumination can be found from the interpolated function. The resulting illumination-estimation method can be used to provide color constancy under changing illumination conditions and automatic white balancing for digital cameras. A thin-plate spline interpolates over a nonuniformly sampled input space, which in this case is a training set of image thumbnails and associated illumination chromaticities. To reduce the size of the training set, incremental k medians are applied. Tests on real images demonstrate that the thin-plate spline method can estimate the color of the incident illumination quite accurately, and the proposed training set pruning significantly decreases the computation.}, }

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  • Name: Computation Vision Laboratory
  • Login: sfu-cs-vision-lab
  • Kind: organization
  • Location: Canada

SFU Computational Vision Lab conducting research into machine vision and image processing, with emphasis on computational models of colour vision

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