Measurement of of color differences of digital cameras from natural images

Traditionally, camera color difference values have been measured using test targets. Test-target measurements are tedious and require a controlled laboratory environment. Compared to images of a real scene, the captured test-target images cannot be utilized for subjective tests. Here, we propose a method for measuring the camera color difference values using a real scene image. The method is based on a reference image that is captured by a color-accurate high-quality camera. The areas suitable for color measurements are searched for in the reference image, and the corresponding areas are located for images captured by the camera to be tested. Based on the results, the method is promising. The areas of correspondence could be localized exactly, and the correlations between the color difference results calculated by the proposed method and the traditional test-target method were generally significant.