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Canny with own gradient (#6664)

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* example using the Canny algorithm with custom image gradient.

* Modified example to integrate new function canny with custom gradient
This commit is contained in:
LaurentBerger 2016-08-16 09:51:09 +02:00 committed by Alexander Alekhin
parent e884bbabcb
commit 42b763e6b7
1 changed files with 24 additions and 7 deletions
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31
samples/cpp/edge.cpp
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@ -9,19 +9,34 @@ using namespace cv;
using namespace std; using namespace std;
int edgeThresh = 1; int edgeThresh = 1;
Mat image, gray, edge, cedge; int edgeThreshScharr=1;
Mat image, gray, blurImage, edge1, edge2, cedge;
const char* window_name1 = "Edge map : Canny default (Sobel gradient)";
const char* window_name2 = "Edge map : Canny with custom gradient (Scharr)";
// define a trackbar callback // define a trackbar callback
static void onTrackbar(int, void*) static void onTrackbar(int, void*)
{ {
blur(gray, edge, Size(3,3)); blur(gray, blurImage, Size(3,3));
// Run the edge detector on grayscale // Run the edge detector on grayscale
Canny(edge, edge, edgeThresh, edgeThresh*3, 3); Canny(blurImage, edge1, edgeThresh, edgeThresh*3, 3);
cedge = Scalar::all(0); cedge = Scalar::all(0);
image.copyTo(cedge, edge); image.copyTo(cedge, edge1);
imshow("Edge map", cedge); imshow(window_name1, cedge);
/// Canny detector with scharr
Mat dx,dy;
Scharr(blurImage,dx,CV_16S,1,0);
Scharr(blurImage,dy,CV_16S,0,1);
Canny( dx,dy, edge2, edgeThreshScharr, edgeThreshScharr*3 );
/// Using Canny's output as a mask, we display our result
cedge = Scalar::all(0);
image.copyTo(cedge, edge2);
imshow(window_name2, cedge);
} }
static void help() static void help()
@ -57,10 +72,12 @@ int main( int argc, const char** argv )
cvtColor(image, gray, COLOR_BGR2GRAY); cvtColor(image, gray, COLOR_BGR2GRAY);
// Create a window // Create a window
namedWindow("Edge map", 1); namedWindow(window_name1, 1);
namedWindow(window_name2, 1);
// create a toolbar // create a toolbar
createTrackbar("Canny threshold", "Edge map", &edgeThresh, 100, onTrackbar); createTrackbar("Canny threshold default", window_name1, &edgeThresh, 100, onTrackbar);
createTrackbar("Canny threshold Scharr", window_name2, &edgeThreshScharr, 400, onTrackbar);
// Show the image // Show the image
onTrackbar(0, 0); onTrackbar(0, 0);