Computer Vision and Image Understanding
Auto-focusing in extreme zoom surveillance: a system approach with application to faces
ISVC'06 Proceedings of the Second international conference on Advances in Visual Computing - Volume Part I
Objective image quality evaluation for JPEG, JPEG 2000, and vidware vision™
PSIVT'06 Proceedings of the First Pacific Rim conference on Advances in Image and Video Technology
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Applications of digital imaging with extreme zoom are traditionally found in astronomy and wild life monitoring. More recently, the need for such capabilities has extended to wide area monitoring such as forest fires, harbors, and waterways. This paper presents a number of sensor arrangements for the acquisition of high magnification images. It also describes user interfaces developed for the system's remote control and data acquisition and processing. Hardware and software considerations are addressed, focusing on optical setups and image de-blurring techniques. An image restoration algorithm tailored to such systems is developed, where an adaptive sharpness measure is employed as a cost function to guide the search for an optimal point spread function (PSF) for image de-blur. Experimental results demonstrate a considerably enhanced robustness to noise and ability to select the optimum PSF, producing much superior restored images.