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Gamma correction, a nonlinear operation, has long been used to code and decode luminance or tristimulus values in video or still image systems [1]. In this paper, we make the following observations: for CAPTCHA images which could not be well binarized using the threshold of OTSU, there exists a gamma corrected image which could be well segmented by the OTSU threshold and the value of the best gamma...
In this paper, a novel local threshold binarization method using structural symmetry of strokes is proposed. Different from most existing local threshold methods which use the whole region to compute the threshold, we estimate the local threshold by only using the structural symmetric pixels (SSP) of the region so as to suppress the non-text pixels and maintain the text ones as well. The SSP is defined...
Text information contained in scene images is very useful for image understanding. In this paper, we propose a high-level representation named stroke bank for scene character recognition. Inspired by the work of object bank, we train stroke detectors and use detectors' maximal output as features. Specifically, we collect training samples for stroke detectors based on labeled key points. We also propose...
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