Question

I'm using zxing on Unity3D and I noticed the default orientation is vertical. For my use case I need to scan barcode horizontally but I can't find how to rotate the default scan orientation. For now I can make it work using both AutoRotate = true and TryHarder = true but it slow down the process (since each image is processed in different orientations). Any idea of how to do that? Thanks.

EDIT: trial working on vertical barcode only

//video feed from camera:
cameraFeed = CameraDevice.Instance.GetCameraImage(Image.PIXEL_FORMAT.GRAYSCALE);
if (cameraFeed == null)
{
return;
}

//reduce the area to scan
barcodeWidth = cameraFeed.BufferWidth;
barcodeHeight = (int)Mathf.Round(cameraFeed.BufferHeight / 2f);
barcodeLeft = 0;
barcodeTop = (int)Mathf.Round(barcodeHeight * 0.25f);

//create a new luminance with this settings
PlanarYUVLuminanceSource barcodeTexture = new PlanarYUVLuminanceSource(cameraFeed.Pixels, cameraFeed.BufferWidth, cameraFeed.BufferHeight, barcodeLeft, barcodeTop, barcodeWidth, barcodeHeight, false);

//rotate LuminanceSource by 90 degree
barcodeTexture2 = barcodeTexture.rotateCounterClockwise();

//read barcode
data = reader.Decode(barcodeTexture2);

EDIT2: another trial, working but too slow

Texture2D screenshot = new Texture2D(Screen.width, Screen.height/3);
screenshot.ReadPixels(new Rect(0, (int)Mathf.Round(Screen.height / 3f), Screen.width, Screen.height / 3), 0, 0);
screenshot.Apply();
Color32[] color = screenshot.GetPixels32();
barcodeTexture3 = new Color32LuminanceSource(color, Screen.width, Screen.height / 3);
data = reader.Decode(barcodeTexture3);

Answer 1

我终于找到了问题。默认情况下，使用纵向模式时，移动设备上的屏幕旋转90度。使用rotateCounterClockwise再次旋转90，所以在这些配置中我都无法读取水平条形码。我找到的解决方案是使用rotateCounterClockwise 3次：90（默认值）+ 3 * 90 = 0！

感谢@Draco18s @Michael进行调试。

Answer 2

我实际上遇到了完全相同的问题。我可以想出一个适合我的解决方案。在通过

获得结果之前

var result = barcodeReader.Decode(scannedPicture,CamTexture.width, CamTexture.height);

我将 scannedPicture（它是 Color32[]）旋转 90 度，然后将其提供给 barcodeReader.Decode(...)。您将找到一种在线旋转一维数组的方法。这不仅可以解决设备方向的问题，还可以让您选择额外检查当前扫描图像的旋转版本，从而扫描未水平对齐的条码。这为我构建的扫描仪功能提供了更灵敏的体验。

Zxing change default orientation to horizontal

2 个答案: