![]() Awesome, we are done with this script, try to run it with different data and see your own results! Once you run this, the decoded data is printed: QRCode data:Īs you can see, the blue lines are drawn in the exact QR code borders. we specified a blue color ( (255, 0, 0) is blue as OpenCV uses BGR colors ) and thickness of 2.įinally, let's show the image and quit when a key is pressed: # display the result We just need data and bbox here, bbox will help us draw the quadrangle in the image and data will be printed to the console!Ĭv2.line(img, point1, point2, color=(255, 0, 0), thickness=2)Ĭv2.line() function draws a line segment connecting two points, we retrieve these points from bbox array that was decoded by detectAndDecode() previously. The detectAndDecode() function takes an image as an input and decodes it to return a tuple of 3 values: the data decoded from the QR code, the output array of vertices of the found QR code quadrangle, and the output image containing rectified and binarized QR code. We have the image and the detector, let's detect and decode that data: # detect and decodeĭata, bbox, straight_qrcode = tectAndDecode(img) Luckily for us, OpenCV already got QR code detector built-in: # initialize the cv2 QRCode detector However, we will be using OpenCV for that, as it is popular and easy to integrate with the webcam or any video.Īlright, open up a new Python file and follow along with me, l et's read the image that we just generated: import cv2 Related: How to Make a Barcode Reader in Python. We specified white as the fill_color and black as the back_color, which is the exact opposite of the default QR code, check it out:Īnd the shape of the image was indeed scaled up and wasn't 21x21: The shape of the QR image: (37, 37) We then add the data using the qr.add_data() method, compiles it to an array using qr.make() method, and then make the actual image using qr.make_image() method. In our case, it will scale up to version 3 automatically.īox_size parameter controls how many pixels each box of the QR code is, whereas the border controls how many boxes thick the border should be. ![]() So in the creation of QRCode class, we specify the version parameter, which is an integer from 1 to 40 that controls the size of the QR code image (1 is small, 21x21 matrix, 40 is 185x185 matrix), but this will be overwritten when the data doesn't fit the size you specify. Img = qr.make_image(fill_color="white", back_color="black") # transfer the array into an actual image Print("The shape of the QR image:", np.array(qr.get_matrix()).shape) Qr = qrcode.QRCode(version=1, box_size=10, border=4) You can also use this library to have full control with QR code generation using the qrcode.QRCode() class, in which you can instantiate and specify the size, fill color, back color, and error correction, like so: import qrcode This will generate a new image file in the current directory with the name of "site.png", which contains a QR code image of the data specified (in this case, this website URL), will look something like this: Installing required dependencies: pip3 install opencv-python qrcode numpy Generate QR Codeįirst, let's start by generating QR codes, it is basically straightforward using qrcode library: import qrcode In this tutorial, you will learn how to generate and read QR codes in Python using qrcode and OpenCV libraries. In practice, QR codes often contain data for a locator, identifier, or tracker that points to a website or application, etc. QR code is a type of matrix barcode that is a machine-readable optical label that contains information about the item to which it is attached. No plugin or software installation required for you.Disclosure: This post may contain affiliate links, meaning when you click the links and make a purchase, we receive a commission. It works from all platforms including Windows, Mac, Android and iOS. Use the QR Code Scanner for free from anywhere. Also you may delete all results in case you don't need them, or your file is sensitive or confidential. You may use the result URL for your convenience or share it. The scanning results are stored for you during 24 hrs. For your convenience our app will also recognize other codes on your image or file and you get all scan results on one page. Our QR-Code Scanner supports various file formats including images, documents, spreadsheets and presentations. Just point your camera and scan your QR-Code, or upload your file to do it. ![]() ![]() Our scanner uses sophisticated algorithms, which allows you to read even damaged QR Codes. You can also scan multiple QR Codes at once. Also the app allows to scan a QR Code directly from your web camera or mobile device camera. QR-Code Scanner App allows you to read QR-Code from images and files of various formats such as documents, presentations, spreadsheets and many more. ![]()
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