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The defocus amount is of great importance to laser welding quality of tight butt joint formed by two sheet metal according to laser welding process. A high-precision measurement system mainly consists of microscopic enlarger lens, CCD camera and LED light source is presented in this article. This measure system which is based on the principle of depth from focus can ensure an accurate defocus amount...
This letter proposes an efficient and robust background compensation method for pan-tilt-zoom cameras. The proposed method approximates the relation between consecutive images to a three-parameter similarity transformation, which is separable in horizontal and vertical axes, and extracts and matches 1-D features that are local minima and maxima of intensity projection profiles in each axis. These...
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