在 Emgu 包装器中使用 UMat

Question

我制作了一个应用程序，我将 HSV 滤镜应用于图像，然后尝试跟踪特定颜色。我想使用 UMat，因为我需要在 GPU 中而不是在 CPU 中计算图像。

在下面的代码中，我首先采用 Image<Bgra, Byte>，然后将其转换为具有 HSV 颜色格式的 UMat 格式。但是，当我拆分频道时，每个频道有 3 个频道（例如 hsvChannels[0] 有三个频道；我不知道为什么会这样）。最后，我无法应用过滤器，因为当我使用 inRangeImage 方法时，我得到了一个具有一个通道和错误形式的图像 CvInvoke.Copy "Unknown array format".

该应用程序不是最好的，但我想先了解 UMat 图像格式的工作原理，然后再尝试改进它。

        private UMat CvAndHsvImage(Image<Bgra, Byte> imgFrame, byte lowerHue, byte upperHue, byte lowerSat, byte upperSat, byte lowerBright, byte upperBright,
        byte erosion = 0, byte dilate = 0, bool hue = false, bool sat = false, bool bright = false, bool invert = false)
    {
        // First convert the input image to hsv so we can change the channels
        //Image<Hsv, Byte> hsvImage = imgFrame.Convert<Hsv, Byte>();
        UMat hsvImage = new UMat();
        UMat bgrImage = new UMat();
        CvInvoke.CvtColor(imgFrame, bgrImage, ColorConversion.Bgra2Bgr);
        CvInvoke.CvtColor(bgrImage, hsvImage, ColorConversion.Bgr2Hsv);

        // Final image that will be returned.
        UMat ResultImage = new UMat();
        UMat ResultImageH = new UMat();
        UMat ResultImageS = new UMat();
        UMat ResultImageV = new UMat();

        UMat[] hsvChannels = new UMat[3];
        hsvChannels = hsvImage.Split();

        UMat img1 = inRangeImage(hsvChannels[0], lowerHue, upperHue);
        UMat img2 = inRangeImage(hsvChannels[1], lowerSat, upperSat);
        UMat img3 = inRangeImage(hsvChannels[2], lowerBright, upperBright);


        #region checkBox Color Mode
        // Evaluation of the check box for each filter. Return the right image
        if (hue)
        {
            CvInvoke.cvCopy(img1, ResultImageH, IntPtr.Zero);
        }
        if (sat)
            //ResultImageS = img2;
            CvInvoke.cvCopy(img2, ResultImageS, IntPtr.Zero);
        if (bright)
            //ResultImageV = img3;
            CvInvoke.cvCopy(img3, ResultImageS, IntPtr.Zero);

        if (hue && !sat && !bright)
            ResultImage = ResultImageH;
        if (!hue && sat && !bright)
            ResultImage = ResultImageS;
        if (!hue && !sat && bright)
            ResultImage = ResultImageV;

        if (hue && sat && !bright)
        {
            CvInvoke.BitwiseAnd(ResultImageH, ResultImageS, ResultImageH);
            ResultImage = ResultImageH;
        }

        if (hue && !sat && bright)
        {
            CvInvoke.BitwiseAnd(ResultImageH, ResultImageV, ResultImageH);
            ResultImage = ResultImageH;
        }

        if (!hue && sat && bright)
        {
            CvInvoke.BitwiseAnd(ResultImageS, ResultImageV, ResultImageS);
            ResultImage = ResultImageS;
        }

        if (hue && sat && bright)
        {
            CvInvoke.BitwiseAnd(ResultImageH, ResultImageS, ResultImageH);
            CvInvoke.BitwiseAnd(ResultImageH, ResultImageV, ResultImageH);
            ResultImage = ResultImageH;
        }
        #endregion

        UMat grayImage = new UMat();

        CvInvoke.CvtColor(ResultImage, bgrImage, ColorConversion.Hsv2Bgr);
        CvInvoke.CvtColor(bgrImage, grayImage, ColorConversion.Bgr2Gray);

        hsvImage.Dispose();
        bgrImage.Dispose();

        return grayImage;

    }

    /// <summary>
    /// Method to define the upper and lower values of the channels of HSV image
    /// </summary>
    /// <param name="hsvImage">Image in HSV and Byte format</param>
    /// <param name="lower">Lower value to be applied</param>
    /// <param name="upper">Upper value to be applied</param>
    /// <returns>Grayscale image with the applied range</returns>
    private UMat inRangeImage(UMat hsvImage, int lower, int upper)
    {
        UMat resultImage = new UMat();
        UMat lowerBorder = new UMat(hsvImage.Rows, hsvImage.Cols, DepthType.Cv8U, 3);
        UMat upperBorder = new UMat(hsvImage.Rows, hsvImage.Cols, DepthType.Cv8U, 3);

        lowerBorder.SetTo(new Gray(lower).MCvScalar);
        upperBorder.SetTo(new Gray(upper).MCvScalar);

        CvInvoke.InRange(hsvImage, lowerBorder, upperBorder, resultImage);

        // Dispose the image due to causing memory leaking.
        lowerBorder.Dispose();
        upperBorder.Dispose();

        return resultImage;

    }

Answer 1

我认为 Emgu.CV 中有一个错误，因为我看到了相同的行为。

尝试使用 CvInvoke.Split() 代替：

private UMat CvAndHsvImage(Image<Bgra, Byte> imgFrame, byte lowerHue, byte upperHue, byte lowerSat, byte upperSat, byte lowerBright, byte upperBright,
    byte erosion = 0, byte dilate = 0, bool hue = false, bool sat = false, bool bright = false, bool invert = false)
{
    // <snip>

    // Final image that will be returned.
    UMat ResultImage = new UMat();
    UMat ResultImageH = new UMat();
    UMat ResultImageS = new UMat();
    UMat ResultImageV = new UMat();

    // << Replaced this >>
    // UMat[] hsvChannels = new UMat[3];
    // hsvChannels = hsvImage.Split();
    // << with this >>
    VectorOfUMat hsvChannels = new VectorOfUMat();
    CvInvoke.Split(hsvImage, hsvChannels);

    // </snip>
}

此方法似乎按预期提供 CV_8UC1 UMats。

在 Emgu 包装器中使用 UMat

Working with UMat in Emgu wrapper

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