c - 我想在 OpenCV 中将图像转换为铅笔草图

Question

我正在尝试将图像(来 self 的硬盘)转换为 OpenCV 中的铅笔素描。我正在使用 Visual Studio 2010。我了解到执行此操作的以下步骤。

1. 反转图像(变为负片)
2. 申请Gaussian blur .
3. 通过线性减淡或颜色减淡混合上述图像。

我已经完成了前两个步骤(非常简单)。现在我需要有关如何在 C 中进行线性闪避的信息。

_{编辑添加...}

我为铅笔草图编写了以下代码。但它能制作铅笔素描吗？请查看结果。我怎样才能让它变得更好？

int main( int argc, char** argv )
{
    int col_1, row_1;
    uchar b_1, g_1, r_1, b_2, g_2, r_2, b_d, g_d, r_d;

    IplImage* img = cvLoadImage( "input file");
    IplImage* img1 = cvCreateImage( cvSize( img->width,img->height ), img->depth, img->nChannels);
    IplImage* img2 = cvCreateImage( cvSize( img->width,img->height ), img->depth, img->nChannels);
    IplImage* dst = cvCreateImage( cvSize( img->width,img->height ), img->depth, img->nChannels);
    IplImage* gray= cvCreateImage(cvGetSize(img), img->depth, 1);

    cvNamedWindow("Input", CV_WINDOW_AUTOSIZE );
    cvNamedWindow("Output", CV_WINDOW_AUTOSIZE );

    cvShowImage("Input", img );
    cvNot(img, img1);
    cvSmooth( img1, img2, CV_BLUR, 25,25,0,0);

    for( row_1 = 0; row_1 < img1->height; row_1++ )
    {
        for ( col_1 = 0; col_1 < img1->width; col_1++ )
        {
            b_1 = CV_IMAGE_ELEM( img1, uchar, row_1, col_1 * 3 );
            g_1 = CV_IMAGE_ELEM( img1, uchar, row_1, col_1 * 3 + 1 );
            r_1 = CV_IMAGE_ELEM( img1, uchar, row_1, col_1 * 3 + 2 );

            b_2 = CV_IMAGE_ELEM( img2, uchar, row_1, col_1 * 3 );
            g_2 = CV_IMAGE_ELEM( img2, uchar, row_1, col_1 * 3 + 1 );
            r_2 = CV_IMAGE_ELEM( img2, uchar, row_1, col_1 * 3 + 2 );

            b_d = b_1 + b_2;
            g_d = g_1 + g_2;
            r_d = r_1 + r_2;

            dst->imageData[img1->widthStep * row_1 + col_1* 3] = b_d;
            dst->imageData[img1->widthStep * row_1 + col_1 * 3 + 1] = g_d;
            dst->imageData[img1->widthStep * row_1 + col_1 * 3 + 2] = r_d;
        }
    }
    cvCvtColor(dst, gray, CV_BGR2GRAY);
    cvShowImage("Output", gray );

    cvWaitKey(0);
    cvReleaseImage( &img );
    cvReleaseImage( &gray);
    cvDestroyWindow("Input");
    cvDestroyWindow("Output");
}

Answer 1

我已申请

1. sobel 滤波器或边缘检测滤波器
2. 反转上面的图像

通过上述方法我得到了一张铅笔素描图像