将代码从 Python 转换为 C# 时遇到问题

Having trouble converting code from Python to c#

已解决:我正在检测护照的机读区。我有一个策略,但由于缺乏文档,我无法转换以下代码行。我的项目正在使用 OpenCvSharp 和 NumSharp,它们是 numpy 到 c# 的端口。任何帮助将不胜感激。

Python代码:

gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

# smooth the image using a 3x3 Gaussian, then apply the blackhat
# morphological operator to find dark regions on a light background
gray = cv2.GaussianBlur(gray, (3, 3), 0)
blackhat = cv2.morphologyEx(gray, cv2.MORPH_BLACKHAT, rectKernel)

# compute the Scharr gradient of the blackhat image and scale the
# result into the range [0, 255]
gradX = cv2.Sobel(blackhat, ddepth=cv2.CV_32F, dx=1, dy=0, ksize=-1)
gradX = np.absolute(gradX)
(minVal, maxVal) = (np.min(gradX), np.max(gradX))
gradX = (255 * ((gradX - minVal) / (maxVal - minVal))).astype("uint8")

C#代码:

// smooth the image using a 3x3 Gaussian, then apply the blackhat
// morphological operator to find dark regions on a light background
smallImage = smallImage.GaussianBlur(new Size(3, 3), 0);
Cv2.MorphologyEx(smallImage, blackhat, MorphTypes.BlackHat, rectKernel);

// 计算黑帽图像的 Scharr 梯度并缩放 // 结果在 [0, 255] 范围内 Cv2.Sobel(blackhat, gradX, MatType.CV_32F, 1, 0, -1, 1, 0);

        //(minVal, maxVal) = (np.min(gradX), np.max(gradX))
        double minVal, maxVal;
        gradX.MinMaxLoc(out minVal, out maxVal);

        //gradX = (255 * ((gradX - minVal) / (maxVal - minVal))).astype("uint8")
        gradX.ConvertTo(gradX, MatType.CV_8U, 255.0 / (maxVal - minVal), -255.0 / minVal);

具体来说,我在处理 Python 代码的最后一行时遇到了问题。我不确定如何在 C# 中执行该计算。我也不确定我是否正确获取了 minValmaxVal 值。

8 位无符号整数在 C# 中是 byte。你可以这样做:

var gradX = Convert.ToByte(255 * ((gradX - minVal) / (maxVal - minVal)));

我不确定那些 min 和 max 函数在做什么,所以我无能为力。

这是我原来问题的解决方案:

// compute the Scharr gradient of the blackhat image and scale the
// result into the range [0, 255]
Cv2.Sobel(blackhat, gradX, MatType.CV_32F, 1, 0, -1, 1, 0);

//(minVal, maxVal) = (np.min(gradX), np.max(gradX))
double minVal, maxVal;
gradX.MinMaxLoc(out minVal, out maxVal);

//gradX = (255 * ((gradX - minVal) / (maxVal - minVal))).astype("uint8")
gradX.ConvertTo(gradX, MatType.CV_8U, 255.0 / (maxVal - minVal), -255.0 / minVal);