QT5与OpenGL和Kinect v2:错误的图像呈现

时间:2017-02-02 11:33:07

标签: c++ qt opencv opengl

我想在Qt小部件中通过openGl上的kinect v2传感器显示彩色图像。问题是,此图像的显示不正确。

这是我得到颜色框的代码:

类:

cv::Mat                     ColorMap;
std::vector<BYTE>           colorBuffer;
int                         color_width;
int                         color_height;

代码:

if(colorBuffer.empty())
   colorBuffer.resize(color_height * color_width * 4 * sizeof(unsigned char));

hr = ColorFrame->CopyConvertedFrameDataToArray((UINT)colorBuffer.size(),
                             &colorBuffer[0], ColorImageFormat::ColorImageFormat_Bgra );

ColorMap = cv::Mat( color_height, color_width, CV_8UC4, &colorBuffer[0]);

这意味着,我将颜色信息作为带有alpha通道的BGR格式并将其复制到具有4个通道的矩阵(BRGA),每个通道的8Bit从0到255.正确吗?

在下一步中,我将其调整为与窗口小部件相同的大小:

    Kinect->CreateFrame();
    cv::Mat GUIColorImage;
    Kinect->ColorMap.copyTo(GUIColorImage);
    cv::resize(GUIColorImage,GUIColorImage,
    cv::Size(ui->Left_Widget_Color->width(),ui->Left_Widget_Color->height()));

比我尝试过两种转换方法: 1.转换为BGR 2.转换为8UC3(8位,无符号字符,3个通道(与BGR相同?)

1:GUIColorImage.convertTo(GUIColorImage,CV_BGRA2BGR);

2:GUIColorImage.convertTo(GUIColorImage,CV_8UC3);

但没有解决方案可行。

转换后,我尝试使用以下命令在openGl上显示它:

LeftWidgetColor.UpdateImage(GUIColorImage);

LeftWidgetColor是一个QOpenGLWidget:

头:

class RenderWidget : public QOpenGLWidget
{
    Q_OBJECT
public:
    RenderWidget(QWidget *parent);
    ~RenderWidget();
    void UpdateImage(cv::Mat newimage);
    void initializeGL();
    void paintGL();

private:
    int                 width;
    int                 height;
    GLuint              texture;
    cv::Mat             image;

signals:
    void info(QString msg);
    void error(QString msg);
    void DepthValueAt(cv::Point2i DepthPosition);

protected:
    void mousePressEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
};

代码:

RenderWidget::RenderWidget(QWidget *parent) : QOpenGLWidget(parent)
{
    width = this->size().width();
    height = this->size().height();
    texture = 0;
    initializeGL();
}

RenderWidget::~RenderWidget()
{
    glDeleteTextures(1, &texture);
}


void RenderWidget::initializeGL()
{
    //Background Color is black
    glClearColor(0,0,0,1);

    //Storage of Pixelmode for two-dimensional textures
    glPixelStorei (GL_UNPACK_ALIGNMENT, 1);

    //Create texture
    glGenTextures(1, &texture);

    glViewport(0, 0, width, height);


}

void RenderWidget::paintGL()
{
    // Clear the screen and depth buffer (with black)
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    // Select the model view matrix and reset it
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    glTranslatef(0.0f, 0.0f, 0.0f);

    // Abort drawing if OpenCV was unable to open the camera
    if (image.empty())
    {
        return;
    }
    glEnable(GL_TEXTURE_RECTANGLE_ARB);

    // Typical texture generation using data from the bitmap
    glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture);

    // Transfer image data to the GPU
    glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0,
                 3, image.cols, image.rows, 0,
                 GL_BGR, GL_UNSIGNED_BYTE, image.data);


    if (glGetError() != GL_NO_ERROR)
    {
    }

    // Draw a 2D face with texture
    glBegin(GL_QUADS);
        glTexCoord2f(0, 0);                   glVertex2f(1, 1);
        glTexCoord2f(image.cols, 0);          glVertex2f(-1, 1);
        glTexCoord2f(image.cols, image.rows); glVertex2f(-1, -1);
        glTexCoord2f(0, image.rows);          glVertex2f(1, -1);
    glEnd();

glDisable(GL_TEXTURE_RECTANGLE_ARB);
}

void RenderWidget::UpdateImage(cv::Mat newimage)
{
    newimage.copyTo(image);
    update();
}

我猜问题出现在:

glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0,
             3, image.cols, image.rows, 0,
             GL_BGR, GL_UNSIGNED_BYTE, image.data);

但我找不到它。我已声明3通道,BGR,8位= 1字节为无符号。有人知道错误在哪里吗?

openGl

如果我通过imshow(openCv类)显示它,它可以正常工作。

imshow over opencv

1 个答案:

答案 0 :(得分:0)

我的错误是,我使用了cv::Mat::convertTo():here 他们写道,convertTo()不应该用来转换格式(只改变数据类型)。 cv :: cvtColor是正确的功能,它适用于我。所以我改变了转换:

GUIColorImage.convertTo(GUIColorImage,CV_BGRA2BGR);

cv::cvtColor(GUIColorImage,GUIColorImage,CV_BGRA2BGR);