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In this paper, the authors propose a novel homomorphic wavelet filtering based illumination transfer technique to change the dominant lighting of one face image (source face image) to another face image (reference face image). Specifically, in the proposed method, based on the "Reflectance-illumination" imaging model, they first obtain an approximate estimate of the illumination component of the face image through a wavelet-based Multi-Resolution Analysis (MRA) in the logarithm domain of the input image. Then, a homomorphic filtering procedure is applied to improve the accuracy of the illumination component estimation. Finally, the source face image is re-lighted by substituting the estimated illumination component of the reference image for that of the source image.
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