Cascade plate recognition system
First Claim
1. A cascade plate recognition system, comprising:
- a compact plate region detection module, further comprising;
a plate-like area generation module, receiving an input image and detecting plate area candidates in said image;
a one-pass plate region extraction module, utilizing a one-pass image scanning process to detect compact plate regions from said plate region candidates, and performing an integrated process implying two functions, non-plate candidates suppression and plate candidates smearing, to obtain all candidates of said compact plate regions without altering the original source via predetermining thresholds, the width and the height of a character and the number of the plate characters; and
a plate verification module, verifying said candidates of compact plate regions and outputting verified compact plate regions; and
a plate character segmentation and recognition module, further comprising;
a histogram segmentation module, receiving said verified compact plate regions and segmenting each said verified compact plate region into independent-character regions and connected-character regions;
a projection segmentation module, defining the boundaries of each said connected-character region and segmenting said connected-character region into said independent-character regions to obtain all said independent-character regions from each said verified compact plate region; and
a character verification module, verifying said independent-character regions and recognizing said verified independent-character regions to obtain the information of the plate characters.
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Abstract
The present invention discloses a cascade plate recognition system, wherein a compact plate region detection module receives an image, detects the plate area candidates of the image, picks out the sequences having continuous identical pixels from the plate area candidates, performs smearing and filtering on the sequences, extracts connected components from the plate area candidates to obtain compact plate regions, verifies the compact plate regions and outputs the verified compact plate regions; a plate character segmentation and recognition module receives the verified compact plate regions, extracts independent-character regions from each verified compact plate regions, verifies the independent-character regions and recognizes the verified independent-character regions to obtain the information of the plate characters. Thereby, the present invention has the advantages of high accuracy, learning capability and fast realtime operation.
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Citations
17 Claims
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1. A cascade plate recognition system, comprising:
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a compact plate region detection module, further comprising; a plate-like area generation module, receiving an input image and detecting plate area candidates in said image; a one-pass plate region extraction module, utilizing a one-pass image scanning process to detect compact plate regions from said plate region candidates, and performing an integrated process implying two functions, non-plate candidates suppression and plate candidates smearing, to obtain all candidates of said compact plate regions without altering the original source via predetermining thresholds, the width and the height of a character and the number of the plate characters; and a plate verification module, verifying said candidates of compact plate regions and outputting verified compact plate regions; and a plate character segmentation and recognition module, further comprising; a histogram segmentation module, receiving said verified compact plate regions and segmenting each said verified compact plate region into independent-character regions and connected-character regions; a projection segmentation module, defining the boundaries of each said connected-character region and segmenting said connected-character region into said independent-character regions to obtain all said independent-character regions from each said verified compact plate region; and a character verification module, verifying said independent-character regions and recognizing said verified independent-character regions to obtain the information of the plate characters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification