readBarcode does not work

[TahaMsv]

Hi. I need to read about 40 barcodes from a single image at once. I have attempted to split the image into 30 smaller and equal parts and read the barcodes from each part individually. But when I use 'readBarcode', It doesn't work and I'm getting nothing. This is my code:

List splitImageParts = [];
@OverRide
void initState() {
// TODO: implement initState
WidgetsBinding.instance.addPostFrameCallback((_) async {
List imageBytes = await getImageBytes('assets/images/bs_image2.png');
imglib.Image? inputImage = imglib.decodeImage(Uint8List.fromList(imageBytes));
splitImageParts = await splitImage(inputImage: inputImage!, horizontalPieceCount: 4, verticalPieceCount: 10);
});
super.initState();
}

Future<List> getImageBytes(String imagePath) async {
ByteData imageData = await rootBundle.load(imagePath);
Uint8List bytes = imageData.buffer.asUint8List();
return bytes.toList();
}

Future<List> splitImage({required imglib.Image inputImage, required int horizontalPieceCount, required int verticalPieceCount}) async {

imglib.Image image = inputImage;
int x = 0, y = 0;
int width = (image.width / horizontalPieceCount).round();
int height = (image.height / verticalPieceCount).round();

// split image to parts
List<imglib.Image> parts = <imglib.Image>[];
for (int i = 0; i < verticalPieceCount; i++) {
  for (int j = 0; j < horizontalPieceCount; j++) {
    parts.add(imglib.copyCrop(image, x: x, y: y, width: width, height: height));
    x += width;
  }
  x = 0;
  y += height;
}

// convert image from image package to Image Widget to display
List<Image> outputImageList = <Image>[];
for (var img in parts) {
  // ByteData imageData = await rootBundle.load(image);
  Uint8List bytes = img.buffer.asUint8List();
  Code? barcode = zx.readBarcode(bytes, width: width, height: height);
  if (barcode != null) {
    if (barcode.text != null) {
      print(barcode.text);
    }
  }
  outputImageList.add(Image.memory(imglib.encodeJpg(img)));
}
return outputImageList;

}

[khoren93]

Thanks for letting me know about your barcode reading issue.

One possible solution is to use the readBarcodesImagePath method instead of the readBarcode method. This method reads multiple barcodes from an image file.

You can use this method to read all the barcodes from a single image at once. Here's an example code snippet that you can use:

// To read multiple barcodes from XFile
XFile xFile = XFile('Your image path');
DecodeParams params = DecodeParams(maxSize: 1920); // also try to set larger image max size. Default is 768
Codes result = await zx.readBarcodesImagePath(xFile, params: params);

Let me know if this helps or if you have any other questions.

[TahaMsv]

Thank you for your response. Your suggestion was very helpful. I tried your solution, but it only found about 4 or 5 out of 40 barcodes. I decided to combine it with my own solution by splitting the original image into 40 parts and passing them to the method you suggested. This helped me read more barcodes, and sometimes I was able to read all of them. However, in some cases, I still missed 3 barcodes. Do you know why this is happening? How can I improve my method to ensure that I can always read all of the barcodes?

[khoren93]

I'm glad to hear that my suggestion was helpful to you. Regarding the issue of missing barcodes, it's hard to tell the exact reason without seeing the images you are working with. It could be due to various factors such as image quality, barcode size, or barcode density in the image.

To help you better, could you please provide a sample image or two that you are working with? This will allow me to test your method and provide you with more targeted suggestions on how you can improve your approach.

[TahaMsv]

Yes, sure.
In the image below, three barcodes (35, 36, and 37) are not read:

while in the second image, all of the barcodes can be read:

[TahaMsv]

I also worked with the image below, but I couldn't read any barcodes. I think this may be because they are in "Code 128" format. Do you have any suggestions on what I can do to add support for this format?