我如何找到一个特定的颜色，并询问它的位置，宽度和高度。

Question

嘿伙计们.

例如，我是否有可能在Photoshop中拥有一幅图片，并在其中制作了一个黑色的表面，以便Unity能够找到该特定的黑色表面，并要求它的位置、宽度和高度。

我想让我的应用程序自动。我的意思是，如果人们造了一个360天穹顶，里面有几个黑色区域，我可以用代码说，统一必须找到那些黑色区域，然后在那里放一部电影。

有谁能帮帮我呢？

Answer 1

如果我理解得对，你想得到特定颜色、宽度和高度的位置。我以前做过这件事，这是我的代码，希望能帮到你。

public static void CheckRotation(string imageFilePath, string templateFilePath, int tryCount)
    {
      if (tryCount > 2)
        throw new Exception("the Image Cant be Detected");

      int leftTotal = 0;
      int leftBlackColor = 0;

      int rightTotal = 0;
      int rightBlackColor = 0;

      byte findLeftAndRight = 0;

      OmrTemplate template = OmrTemplate.Load(templateFilePath);
      OmrImage image = OmrImage.Load(imageFilePath);
      OmrEngine engine = new OmrEngine(template);
      image.AutoDetectResolution = true;

      OmrProcessingResult result = engine.ExtractData(new OmrImage[] { image });
      Hashtable OmrResult = result.PageData[0];
      ICollection key = OmrResult.Keys;

      OmrElementsCollection collection = template.Pages[0].Elements;
      foreach (Object obj in collection)
      {
        if (obj.GetType() == typeof(ChoiceBoxElement))
        {
          var elem = (ChoiceBoxElement)obj;

          if (elem.Name.ToString().ToUpper() == "LEFT" || elem.Name.ToString().ToUpper() == "RIGHT")
          {
            findLeftAndRight++;

            var xPosition = int.Parse(Math.Floor((elem.Position.X * 150) / 25.4).ToString()) + 1;
            var yPosition = int.Parse(Math.Floor((elem.Position.Y * 150) / 25.4).ToString()) + 1;

            Bitmap bitmap = new Bitmap(imageFilePath);
            BitmapData data = bitmap.LockBits(new System.Drawing.Rectangle(xPosition, yPosition, int.Parse(Math.Floor((elem.Size.Width * 150) / 25.4).ToString()), int.Parse(Math.Floor((elem.Size.Height * 150) / 25.4).ToString())),
            ImageLockMode.ReadOnly, bitmap.PixelFormat);  // make sure you check the pixel format as you will be looking directly at memory

            unsafe
            {
              // example assumes 24bpp image.  You need to verify your pixel depth
              // loop by row for better data locality
              for (int y = 0; y < data.Height; ++y)
              {
                byte* pRow = (byte*)data.Scan0 + y * data.Stride;
                for (int x = 0; x < data.Width; ++x)
                {
                  // windows stores images in BGR pixel order
                  byte r = pRow[2];
                  byte g = pRow[1];
                  byte b = pRow[0];

                  if (elem.Name.ToString().ToUpper() == "LEFT")
                    leftTotal++;
                  else if (elem.Name.ToString().ToUpper() == "RIGHT")
                    rightTotal++;

                  if (
                      (r == 0 && g == 0 && b == 0) ||
                      ((r < 100 && g < 100) || (r < 100 && b < 100) || (b < 100 && g < 100)) ||
                      (r < 120 && g < 120 && b < 120 && Math.Abs(r - g) < 10 && Math.Abs(r - b) < 10 && Math.Abs(b - g) < 10)
                    )
                  {
                    if (elem.Name.ToString().ToUpper() == "LEFT")
                      leftBlackColor++;
                    else if (elem.Name.ToString().ToUpper() == "RIGHT")
                      rightBlackColor++;
                  }


                  // next pixel in the row
                  pRow += 3;
                }
              }
            }

            bitmap.UnlockBits(data);
          }
        }
      }

      if (findLeftAndRight != 2)
        throw new Exception("The Left and Right Mark Didnt Exists!!");

      var leftPercentage = (leftBlackColor / leftTotal) * 100;
      var rightPercentage = (rightBlackColor / rightTotal) * 100;

      if (leftPercentage > 80 && rightPercentage > 80) //It means The Paper is Currect Rotation
        return;
      else
      {
        RotateImage(imageFilePath, 180);
        CheckRotation(imageFilePath, templateFilePath, ++tryCount);
      }


    }