Get barcode region coordinates in image
You can define one or more rectangle region(s) in an image, and the barcode scanner library will scan barcodes from these defined regions only. It will really improve the
barcode scanning and reading speed and accuracy.
Defined region coordinates
To define a rectangle region inside an image, you need provide two points' coordinates of the rectangle inside the image.
- Point One (x1, y1), the top left corner of the rectangle.
- Point Two (x2, y2), the bottom right corner of the rectangle
The coordinate values are expressed as the percentage of the image width and height.
The origin (0,0) of the coordinate system is the upper left point of the image. The point (100, 100) is the bottom right point of the image.
The C# code below we have defined one rectangle region. It's top left corner (Point One) is the same position as the image upper left point. The rectangle width is the same as the image width, and the rectangle height is 20% of the image height.
The origin (0,0) of the coordinate system is the upper left point of the image. The point (100, 100) is the bottom right point of the image.
The C# code below we have defined one rectangle region. It's top left corner (Point One) is the same position as the image upper left point. The rectangle width is the same as the image width, and the rectangle height is 20% of the image height.
float x1 = 0; float y1 = 0; float x2 = 100; float y2 = 20; new SRegion(x1, y1, x2, y2);
The following C# sample code explains how to scan QR Codes from the top 20% of the image using C#.
ScanOptions opts = new ScanOptions(BarcodeType.QRCode); float x1 = 0; float y1 = 0; float x2 = 100; float y2 = 20; List<SRegion> regions = new List<SRegion>(); regions.Add(new SRegion(x1, y1, x2, y2)); opts.SetScanRegions(regions); BarcodeDetail[] datas = BarcodeScanner.Scan("qrcode-barcodes.png", opts);
