An answer card scoring method based on image recognition
An image recognition and answer sheet technology, applied in the field of answer sheet identification, can solve problems such as many usage restrictions, incorrect grade data, uneven paper thickness and paper moisture, etc., to reduce hardware costs, high accuracy and error tolerance, The effect of improving the efficiency of scoring
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[0110] The answer sheet is A4 paper size, and the image of the answer sheet is obtained by using a scanner. The answer sheet is designed according to fixed rules, including both sides, and the front is as follows: figure 2 As shown, the reverse is as image 3 As shown, each side has global positioning blocks at the upper two corners, the front side includes 23 multiple choice questions and 2 subjective questions, and the back side only includes 2 subjective questions.
[0111] combine figure 1 , a method for scoring answer sheets based on image recognition, comprising the following steps:
[0112] Step 1, preprocessing the answer sheet image, including grayscale processing and binarization processing, to obtain the binary grayscale image of the answer sheet, such as Figure 4 As shown, the details are as follows:
[0113] Step 1.1, use the method of converting the BGR color model of the OPENCV library to the GRAY color model, and perform grayscale processing on the scanne...
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