Character segmentation method and device based on edge detection and contour detection
A character segmentation method and apparatus, and a computer-readable storage medium are provided. The method includes converting a character area image into a grayscale image; converting the grayscale image into an edge binary image by edge detection; acquiring character box segmentation blocks from the edge binary image by projection; and determining a target character area from the character box segmentation blocks by contour detection, and performing character segmentation on the character area image according to the target character area; or comprises: converting a character area image into a grayscale image; performing clustering analysis on the grayscale image by fuzzy C-means clustering, and binarizing the grayscale image according to the analysis result; acquiring character positioning blocks from a binary image by projection; and performing character segmentation on the character area image according to position information of the character positioning blocks. Character segmentation can be performed on a relatively low quality image.
1. A character segmentation method, comprising:
acquiring a character region image and converting the character region image into a grayscale image, wherein the character region image comprises at least one character frame;
adaptively adjusting parameters of an edge detection algorithm based on image quality characteristics of the grayscale image, and converting the grayscale image into an edge binary image by utilizing the edge detection algorithm;
acquiring, from the edge binary image, at least one segment for the at least one character frame by utilizing a projection approach;
determining a character contour in each of the at least one segment by utilizing a contour detection algorithm; and
determining a minimum enclosing rectangle region of the character contour in each of the at least one segment and performing character segmentation on the character region image based on the minimum enclosing rectangle region.
2. The character segmentation method according to claim 1 , further comprising, prior to converting the grayscale image into the edge binary image by utilizing the edge detection algorithm:
performing median filtering and/or Gaussian filtering on the grayscale image.
3. The character segmentation method according to claim 1 , wherein utilizing the edge detection algorithm comprises utilizing a Canny operator.
4. The character segmentation method according to claim 1 , wherein the image quality characteristics comprise at least one of a global contrast or a global grayscale mean value.
5. The character segmentation method according to claim 1 , wherein utilizing the projection approach comprises:
performing segmentation on the edge binary image by a vertical projection to acquire the at least one segment for the at least one character frame.
6. A character segmentation device, comprising:
an acquisition module configured to acquire a character region image and convert the character region image into a grayscale image, wherein the character region image comprises at least one character frame;
an edge detection module configured to adaptively adjust parameters of an edge detection algorithm based on image quality characteristics of the grayscale image, and convert the grayscale image into an edge binary image by utilizing the edge detection algorithm;
a projection module configured to acquire, from the edge binary image, at least one segment for the at least one character frame by utilizing a projection approach; and
a contour detection module configured to determine a character contour in each of the at least one segment by utilizing a contour detection algorithm, and determine a minimum enclosing rectangle region of the character contour in each of the at least one segment and perform character segmentation on the character region image based on the minimum enclosing rectangle region.
7. A character segmentation device, comprising:
one or more multicore processors; and
a memory having one or more programs stored therein,
wherein the one or more programs, when executed by the one or more multicore processors, cause the one or more multicore processors to implement the character segmentation method according to claim 1 .
8. A non-transitory computer-readable storage medium having programs stored thereon, wherein the programs, when executed by a multicore processor, cause the multicore processor to implement the character segmentation method according to claim 1 .