Automatic method for brightness adjustment in regions of interest in photography
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One of the most commonly used techniques in photo retouching is to highlight or modify the brightness of specific areas or objects in the image that appear dark to make them more noticeable. This task is usually done by hand, but it is a subjective and sometimes long process, depending on the quality of the adjustment required by the user. Therefore, based on the idea used for the removal of noise in images by means of the joint bilateral and guided filters, in this work, the use of a second image of the same scene is proposed. This second image, acquired with different lightning and in which the area to be highlighted appears with the desired intensity, is used to adjust the brightness of the same area in the image to be processed. The method is based on a technique previously employed for the adjustment of monochromatic microscopy images, in which two two-dimensional histograms are obtained from the pixels of the region to be modified and another two from the one that serves as a guide. From each pair of histograms, five profiles are obtained, which are used to automatically adjust the brightness of the region of interest to be processed, taking the one that produces the closest result among the regions of interest using the Bhattacharyya distance. In this way, it is possible to make photographic effects for image correction. The results obtained show the quality of the proposed technique.