OpenCV WeChat QRCode Reader

How to Use this Tool to Detect QR Code Using WeChat's QRCode Reader

This tool is designed to help you read QR codes from images by defining bounding boxes. A bounding box helps in identifying and locating specific objects within an image, which is particularly useful for tasks like detecting and reading QR codes.

Important: This tool operates entirely within your web browser. No images are uploaded to any server, and no data is stored. All processing happens locally on your computer, ensuring your images and the bounding box data remain private and secure.

What is WeChat OpenCV QRReader?

OpenCV QrReader Documentation WeChat QRCode includes two CNN-based models: A object detection model and a super resolution model. Object detection model is applied to detect QRCode with the bounding box. super resolution model is applied to zoom in QRCode when it is small.

Here's how to use it:

• Load an Image: You can either upload an image file using the "Choose File" button, paste an image URL into the text field, or paste an image directly from your clipboard (Ctrl+V / Cmd+V).
• If you do not define a bounding box, Click "ReadQR" the entire image will be read. Otherwise:
  1. Draw a Bounding Box:
     1. Click and hold the left mouse button where you want to start the top-left corner of your bounding box.
     2. Drag the mouse to the bottom-right corner of the object you want to enclose. This could be the QR code.
     3. Release the mouse button. A red overlay will appear, representing your bounding box.
     4. Click "ReadQR"
  2. Enter Coordinates: If you prefer not to use the mouse, you can enter the coordinates of the top-left (x1, y1) and bottom-right (x2, y2) corners of the bounding box directly in the text area provided. Use the format: x1,y1,x2,y2. Coordinates can be absolute pixel values or relative values (normalized to the range [0, 1]). Click the Crop And Read button. This will use the defined bounding box to isolate the area containing the QR code and attempt to read it using a WeChat-like QR code reader.
• View Results: The tool will display the results of the QR code reading in the text area provided. It may show the decoded data or an error message if the QR code cannot be read.
• Clear Boxes: Use the "Clear" button to remove all drawn bounding boxes from the image and reset the tool for a new scan.