Capture only the QR Code section of an image by cropping it

Currently working on a web project that requires scanning a QR code using the camera on the device. Unfortunately, iOS does not allow direct access to the camera for this purpose, so we have resorted to uploading a picture of the QR code instead.

The problem arises when the image uploaded contains additional information around the QR code, causing the libraries we are utilizing to be unable to decrypt the code. Simply capturing the QR code alone is proving to be challenging.

Are there any potential solutions that would allow us to crop out just the QR code portion of the image? Alternatively, is there a library available that can successfully decode the QR code even with extraneous information present in the image?

Answer №1

To extract the QR code from an image, one method is to first draw the entire image onto a canvas. From there, you can carefully select and copy the specific area of the image that contains the QR code. Once selected, you can create a new Image element with this extracted portion before converting it into either a blob or dataURL format.

It's worth noting that the most challenging aspect of this process is accurately identifying the exact location of the QR code within the image.

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