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I. Environmental configuration

Need pillow and pytesseract these two libraries, pip install installation is fine.

Pip install pillow-I http://pypi.douban.com/simple-- trusted-host pypi.douban.compip install pytesseract-I http://pypi.douban.com/simple-- trusted-host pypi.douban.com

Install Tesseract-OCR.exe

The configuration of the pytesseract library: search to find pytesseract.py, open the .py file, find tesseract_cmd, and change its value to the path where tesseract.exe was just installed.

Second, verification code recognition

In order to identify the CAPTCHA code, it is necessary to preprocess the image to remove the lines or noise that will affect the recognition accuracy and improve the recognition accuracy.

Example 1import cv2 as cvimport pytesseractfrom PIL import Imagedef recognize_text (image): # Edge preserving filtering dst = cv.pyrMeanShiftFiltering (image, sp=10, sr=150) # Grayscale image gray = cv.cvtColor (dst, cv.COLOR_BGR2GRAY) # binary ret, binary = cv.threshold (gray, 0,255, cv.THRESH_BINARY_INV | cv.THRESH_OTSU) # morphological operation corrosion expansion erode = cv.erode (binary None, iterations=2) dilate = cv.dilate (erode, None, iterations=1) cv.imshow ('dilate', dilate) # logical operation makes it easy to identify cv.bitwise_not (dilate, dilate) cv.imshow (' binary-image') when the background is white and black. Dilate) # identify test_message = Image.fromarray (dilate) text = pytesseract.image_to_string (test_message) print (f 'recognition result: {text}') src = cv.imread (rattle.Unitestbank 044.png') cv.imshow ('input image', src) recognize_text (src) cv.waitKey (0) cv.destroyAllWindows ()

The running effect is as follows:

Recognition result: 3n3D

Process finished with exit code 0

Example 2import cv2 as cvimport pytesseractfrom PIL import Imagedef recognize_text (image): # Edge preserving filtering blur = cv.pyrMeanShiftFiltering (image, sp=8, sr=60) cv.imshow ('dst', blur) # Grayscale image gray = cv.cvtColor (blur, cv.COLOR_BGR2GRAY) # binary ret, binary = cv.threshold (gray, 0,255) Cv.THRESH_BINARY_INV | cv.THRESH_OTSU) print (f 'binarization adaptive threshold: {ret}') cv.imshow ('binary', binary) # Morphology operation get structural elements open operation kernel = cv.getStructuringElement (cv.MORPH_RECT, (3,2)) bin1 = cv.morphologyEx (binary, cv.MORPH_OPEN, kernel) cv.imshow (' bin1', bin1) kernel = cv.getStructuringElement (cv.MORPH_OPEN (2, 3) bin2 = cv.morphologyEx (bin1, cv.MORPH_OPEN, kernel) cv.imshow ('bin2', bin2) # logical operation makes it easy to identify cv.bitwise_not (bin2, bin2) cv.imshow (' binary-image') when the background is white and black. Bin2) # identify test_message = Image.fromarray (bin2) text = pytesseract.image_to_string (test_message) print (f 'recognition result: {text}') src = cv.imread (rattle.UnitestDB 045.png') cv.imshow ('input image', src) recognize_text (src) cv.waitKey (0) cv.destroyAllWindows ()

The running effect is as follows:

Binarization adaptive threshold: 181.0

Recognition result: 8A62N1

Process finished with exit code 0

Example 3import cv2 as cvimport pytesseractfrom PIL import Imagedef recognize_text (image): # Edge preserving filter denoising blur = cv.pyrMeanShiftFiltering (image, sp=8, sr=60) cv.imshow ('dst', blur) # Grayscale image gray = cv.cvtColor (blur, cv.COLOR_BGR2GRAY) # if the adaptive threshold is set by binarization, ret cannot be extracted from yellow 4, binary = cv.threshold (gray, 185,255) Cv.THRESH_BINARY_INV) print (threshold set by f 'binarization: {ret}') cv.imshow ('binary', binary) # logical operation makes the background white font black to make it easy to identify cv.bitwise_not (binary, binary) cv.imshow (' bg_image') Binary) # identify test_message = Image.fromarray (binary) text = pytesseract.image_to_string (test_message) print (f 'recognition result: {text}') src = cv.imread (rattle.UnitestDB 045.jpg') cv.imshow ('input image', src) recognize_text (src) cv.waitKey (0) cv.destroyAllWindows ()

The running effect is as follows:

Threshold set for binarization: 185.0

Recognition result: 7364

Process finished with exit code 0

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