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K big "digital image processing" class ppt
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Application background This course consists of six chapters: introduction and digital image basis; the second chapter: signal processing based on; the third chapter: image transform; Chapter Four: image enhancement; the fifth chapter: image segmentation; the sixth chapter: image feature extraction and recognition. And accompanied by normal operations, exercises code and procedures, beginners finished the course, can very easy entry and the image processing the basic theory of several aspects to be mastered, then on the back of in-depth study will much easier.
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Pre-rec.m and ROC curves
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Application background Precision ratio (P), recall ratio, referred to as R, using precision and recall metrics can be for each a retrieval retrieval efficiency evaluation and provide scientific basis for retrieval of the adjustment and improvement. By using these two quantitative indicators, the performance level of the information retrieval system can be evaluated. To evaluate the performance level of the information retrieval system, it is necessary to carry out a number of searches in a retrieval system. Every one search, calculate the precision and recall, and regard it as the coordinate values, in the coordinate plane marked. Through a large number of retrieval, we can get the performance curve of the retrieval system. Experimental results show that there exist between recall ratio and precision ratio instead of the interdependent relationships - if increase the output of the recall, will reduce the precision, and vice versa. Schroedl Stefan source code, the pr
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