Optical EngineeringAnalyzing the effect of imagery wavelength on the agreement between various image metrics and human detection performance of targets embedded in natural images
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The effect of imagery wavelength on the agreement level between various image metrics and human detection performance of targets embedded in natural images is addressed. Three specially designed psychophysical experiments were conducted to record human detection performance of targets embedded in natural infrared images (3 to 5 and 8 to 12 ?m) and in natural images taken in the visual region of the spectrum. The image metrics used were designed to imitate some of the most important human perceptual cues, such as global image complexity (clutter), local target to background distinctness (contrast), and texture. The agreement level between the experimental results and the metrics products was evaluated by correlating the metrics values with target detection results obtained from each of the three psychophysical experiments. In general, it was found that the longer the imagery wavelength, the greater the dominance of global image complexity on human detection performance, and that local target to background distinctness correlates with performance for short wavelength imagery. It was also found that image texture correlates with human detection performance with very little dependence on imagery wavelength.