A Technique for Simulating Pseudo Natural Color Images Based on Spectral Similarity Scales

Natural color images are superior to false color images for presentation and visual interpretation purposes. They are widely used in the fields of fly-through of a draped terrain, visual interpretation, and display and have been designed, for example, for nonremote sensing professional users. However, each sensor has its own purpose, application, and limitation. In addition, blue wavelengths suffer the greatest scattering in the atmosphere, which follows an inverse dependence on wavelength to the fourth power. Some of high-resolution satellites cover only two visual spectral bands (green and red bands) plus one in the near-infrared region. As a result, a true color image cannot be formed, as the blue band is necessary in the red, green, and blue combination. This has become problematic for users needing a natural color composite that has limited the application of high-resolution images. To overcome this problem, in this letter, we propose a new approach for generating pseudo natural color (PNC) composite representations from false color composite images based on the spectral similarity scale. The method is validated experimentally. The proposed "natural color generator" can be applied to change false color images into natural color images. The generated PNC images are shown to be of high quality.