Vehicle license plate image vertical tilt correction method
A technology of vertical tilt and license plate image, which is applied in the direction of instruments, character and pattern recognition, computer parts, etc., can solve the problems of large amount of calculation and low accuracy, and achieve the effect of simplifying calculation, satisfying real-time performance and improving calculation efficiency
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[0032] Embodiment 1: Take the artificially set license plate image with a vertical tilt angle as an example:
[0033] In this embodiment, seven characters are randomly selected from the set of possible values of the license plate characters to construct a license plate image with a vertical tilt angle of 20 degrees to the positive direction of the x-axis. The size of the license plate image is 120×566 (pixels). For example, the license plate characters selected are: {京AF0236}, such as Figure 5 Shown. Among them, the value set of the non-Chinese part of the license plate characters is a combination of numbers {0-9} and English letters {AZ}. Chinese characters include "Beijing, Tianjin, Hebei" and other provinces and municipalities abbreviated as "shi", "领", Special Chinese characters such as "学" and "警".
[0034] The specific implementation process of this embodiment is as follows:
[0035] Step 101: The height and width of the binary image of the registered license plate are H=1...
Example Embodiment
[0051] Embodiment 2: Take the actual shooting of a license plate image with a vertical tilt angle as an example:
[0052] The image in this embodiment is an image of a license plate actually taken. In the actual shooting process, if the camera is not directly in front of the license plate, the captured image will have a certain degree of vertical tilt. First locate the license plate on the captured image, then perform binarization and horizontal tilt correction on the license plate, and finally remove the upper and lower borders of the license plate image. The obtained license plate image is used as the input image of this embodiment, and the image size is 140×620 (pixels) .
[0053] The specific implementation process of this embodiment is as follows:
[0054] Step 101: Record the height and width of the input binary image of the license plate as H=140 (pixels) and W=620 (pixels) respectively, and find the binary image of the input license plate (horizontal tilt correction and remo...
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