tesseract-ocrHow can I use Tesseract OCR to scan a QR code?
Using Tesseract OCR to scan a QR code involves the following steps:
- Install the Tesseract OCR library.
- Import the Tesseract library into your project.
- Load the image of the QR code into memory.
- Use the Tesseract library to detect the QR code in the image.
- Extract the text from the QR code.
For example, in Python:
# import the necessary packages
import pytesseract
import cv2
# load the example image and convert it to grayscale
image = cv2.imread("qrcode.png")
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
# apply thresholding to preprocess the image
thresh = cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY | cv2.THRESH_OTSU)[1]
# load the image as a PIL/Pillow image, apply OCR, and then delete
# the temporary file
text = pytesseract.image_to_string(thresh)
print(text)
Output example
This is a QR code
Code explanation
import pytesseract
: This imports the Tesseract library.import cv2
: This imports the OpenCV library.image = cv2.imread("qrcode.png")
: This loads the image of the QR code into memory.gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
: This converts the image to grayscale.thresh = cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY | cv2.THRESH_OTSU)[1]
: This applies thresholding to preprocess the image.text = pytesseract.image_to_string(thresh)
: This uses the Tesseract library to detect the QR code in the image and extract the text from it.print(text)
: This prints the extracted text.
Helpful links
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