Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
528924 | Image and Vision Computing | 2011 | 12 Pages |
Automatic exposure controls in commercially available cameras often encounter difficulties in capturing scenes with backlight luminance which dominates the entire image. An Adaptive Height-Modified Histogram Equalization (AHMHE) algorithm is proposed as a compensation technique for backlight images. It simultaneously enhances contrast in both the dark and the bright areas without creating regions of degraded local contrast. Moreover AHMHE is an adaptive algorithm: thus it requires minimal user input, and its reduced computational requirement makes it suitable for real-time application. In addition to AHMHE, a chroma correction technique was applied to chroma components in the YCbCr color space to produce more vivid color images. A series of subjective and index evaluations were conducted to measure the resultant image quality improvements by the AHMHE and the chroma correction algorithms.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (96 K)Download as PowerPoint slideHighlights► Backlight image compensation technique. ► Contrast enhances in both dark and bright areas without degraded local contrast. ► Chroma correction is performed after. ► Evaluations demonstrate the image quality improvement.