Answer sheet full-filling identification method and system
A recognition method and answer sheet technology, which are applied in character and pattern recognition, image data processing, instruments, etc., can solve the problems of inaccurate identification of answer sheets, offset of picture positions of answer sheets, affecting the development of answer sheet technology, etc. Wide range of effects, increased flexibility and efficiency
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Embodiment 1
[0053] A method 100 of answer sheet filling and identification, such as figure 1 shown, including:
[0054] Step 110, obtaining the scanned picture of the answer sheet of the answerer.
[0055] Step 120, according to the first baseline frame, the first parameter information and the Cartesian coordinate system of the answer sheet, determine the second baseline frame corresponding to the first baseline frame in the scan image and the second parameter information of the scan image.
[0056] Step 130, according to the first parameter information, the second parameter information and the Cartesian coordinate system, determine the coordinate offset coefficient of the second baseline frame relative to the first baseline frame.
[0057] Step 140, according to the coordinate offset coefficient and the first parameter information, determine the coordinate values of the boundary points of all the filled grids in the scanned image.
[0058] Step 150 , according to the coordinate value...
Embodiment 2
[0063] On the basis of Example 1, as figure 2 As shown, before step 110, method 100 also includes:
[0064] Step 160, establish the reference map corresponding to the answer sheet, and determine the Cartesian coordinate system, the first baseline frame in the reference map, and the first parameter information of the reference map.
[0065] Step 170, save the Cartesian coordinate system, the first baseline frame and the first parameter information.
[0066] Among them, the reference image is the first rectangle; the first baseline frame is the second rectangle, and the upper boundary line, lower boundary line, left boundary line and right boundary line of the second rectangle correspond to the upper boundary line and lower boundary line of the first rectangle respectively. , the left boundary line is parallel to the right boundary line, and the second rectangle is located inside the first rectangle; the first parameter information includes the coordinate values of the four ...
Embodiment 3
[0070] On the basis of Example 2, such as image 3 As shown, step 120 includes:
[0071] Step 121, identify the binarized scanned image row by row or column by column, determine the first ratio of the maximum number of continuous black dots in each row or column to the total number of pixels and the total number of black dots to the total number of pixels The second ratio of the total number.
[0072] Step 122, comparing the size of the first ratio with the first threshold and the size of the second ratio with the second threshold, when the first ratio is greater than the first threshold and the second ratio is greater than the second threshold, then determine that the row or column is the baseline The bounding line of the box.
[0073] Step 123: When the number of determined boundary lines is two, the recognition of the second baseline frame is completed; when the number of determined boundary lines is less than two and the binarized scanned image is not rotated according t...
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