Principal angles

An example of histogram matching

Histogram matching is a method in image processing of color adjustment of two images using the image histograms.

It is possible to use histogram matching to balance detector responses as a relative detector calibration technique. It can be used to normalize two images, when the images were acquired at the same local illumination (such as shadows) over the same location, but by different sensors, atmospheric conditions or global illumination.

The algorithm

Given two images, the reference and the adjusted images, we compute their histograms. Following, we calculate the cumulative distribution functions of the two images' histograms - $F_{1}()\,$ for the reference image and $F_{2}()\,$ for the target image. Then for each gray level $G_{1}\in [0,255]$, we find the gray level $G_{2}\,$ for which $F_{1}(G_{1})=F_{2}(G_{2})\,$, and this is the result of histogram matching function: $M(G_{1})=G_{2}\,$. Finally, we apply the function $M()\,$ on each pixel of the reference image.

Multiple Histograms Matching

The Histogram matching Algorithm can be extended to find a monotonic mapping between two sets of histograms. Given two sets of histograms $P=\{p_{i}\}_{i=1}^{k}$ and $Q=\{q_{i}\}_{i=1}^{k}$, the optimal monotonic color mapping $M$ is calculated to minimize the distance between the two sets simultaneously, namely $min_{M}\ \sum _{k}d(M(p_{k}),q_{k})$ where $d(.,.)$ is a distance metric between two histograms. The optimal solution is calculated using dynamic programming

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

See also

• Histogram equalization
• Image histogram
• Color mapping

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