I am using expo-camera to scan barcode but firstly I want to invert the color of camera feed then scan.

[mohd-saqlain]

I am using expo-camera to scan barcode but firstly I want to invert the color of camera feed then scan.

[wodin]

Hi @mohd-saqlain

See my answer here:

I am using expo-camera to scan data matrix barcode which is printed on steel so, I want to invert the color of scanning then scan. I have used expo-gl but it created visual effect but not inverted real camera image on runtime

Hi @mohd-saqlain I suppose you might be able to capture a frame, invert it (e.g. using an image processing library) and then try detecting the data matrix in the inverted image using Expo’s BarCodeScanner. I’m not sure how well this will work. Alternatively, it seems that these commercial barcode scanner libraries all support data matrix barcodes and they all seem to support scanning inverted barcodes too. I have not tried any of them: Scandit Data Capture Basics — Data Capture SDK 6.18.1 do…

Another possibility might be to use a React Native Vision Camera frame processor plugin to invert the image before trying to detect the barcode. I assume you could modify one of the existing plugins. e.g.:

• rodgomesc/vision-camera-qrcode-scanner: A plugin to read barcodes using MLKit Vision QrCode Scanning
• xulihang/vision-camera-dynamsoft-barcode-reader: A plugin to read barcodes using Dynamsoft Barcode Reader.