Method and device for recognizing characters in image on basis of optical character recognition

The invention relates to a method and device for recognizing characters in an image on the basis of optical character recognition. In one embodiment, the method includes the following steps of converting the image into a gray image through graying, siding an image reading window, cutting out the gray image within the preset range in a circulating mode till the image is completely cut out, conducting binaryzation on the image which is cut out and is within the preset value according to a first threshold value calculated through a preset calculation method till the gray image is completely binarized, conducting discrete distribution on the gray value of the binarized gray image and converting the gray value to the frequency domain through discrete Fourier transform, adjusting the point values in the frequency domain through Gaussia filtering, setting the values of all the points with the distances between the points and the center smaller than the preset value in the frequency domain to be zero, obtaining a processing image, and recognizing character clusters in the processing image to generate a target character cluster. According to the method and the device, the character clusters in the image can be more accurately recognized.