Illumination estimation via nonnegative matrix factorization

  title={Illumination estimation via nonnegative matrix factorization},
  author={Lilong Shi and Brian V. Funt and Weihua Xiong},
  journal={J. Electronic Imaging},
The problem of illumination estimation for colour constancy and automatic white balancing of digital color imagery can be viewed as the separation of the image into illumination and reflectance components. We propose using nonnegative matrix factorization with sparseness constraints (NMFsc) to separate the components. Since illumination and reflectance are combined multiplicatively, the first step is to move to the logarithm domain so that the components are additive. The image data is then… CONTINUE READING


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