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Merge pull request #72 from eschnou/feature_contour_moments

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Compute the moments of a contour
This commit is contained in:
Peter Braden 2013-09-05 05:42:58 -07:00
commit dd5961cfe2
3 changed files with 29 additions and 1 deletions
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7
examples/contours.js
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@ -7,7 +7,7 @@ var maxArea = 2500;
var GREEN = [0, 255, 0]; //B, G, R var GREEN = [0, 255, 0]; //B, G, R
var WHITE = [255, 255, 255]; //B, G, R var WHITE = [255, 255, 255]; //B, G, R
var RED = [0, 0, 255]; //B, G, R
cv.readImage('./stuff.png', function(err, im) { cv.readImage('./stuff.png', function(err, im) {
@ -24,7 +24,12 @@ cv.readImage('./stuff.png', function(err, im) {
for(i = 0; i < contours.size(); i++) { for(i = 0; i < contours.size(); i++) {
if(contours.area(i) > maxArea) { if(contours.area(i) > maxArea) {
var moments = contours.moments(i);
var cgx = Math.round(moments.m10/moments.m00);
var cgy = Math.round(moments.m01/moments.m00);
big.drawContour(contours, i, GREEN); big.drawContour(contours, i, GREEN);
big.line([cgx - 5, cgy], [cgx + 5, cgy], RED);
big.line([cgx, cgy - 5], [cgx, cgy + 5], RED);
} }
} }

22
src/Contours.cc
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@ -33,6 +33,7 @@ Contour::Init(Handle<Object> target) {
NODE_SET_PROTOTYPE_METHOD(constructor, "boundingRect", BoundingRect); NODE_SET_PROTOTYPE_METHOD(constructor, "boundingRect", BoundingRect);
NODE_SET_PROTOTYPE_METHOD(constructor, "minAreaRect", BoundingRect); NODE_SET_PROTOTYPE_METHOD(constructor, "minAreaRect", BoundingRect);
NODE_SET_PROTOTYPE_METHOD(constructor, "isConvex", IsConvex); NODE_SET_PROTOTYPE_METHOD(constructor, "isConvex", IsConvex);
NODE_SET_PROTOTYPE_METHOD(constructor, "moments", Moments);
target->Set(String::NewSymbol("Contours"), m->GetFunction()); target->Set(String::NewSymbol("Contours"), m->GetFunction());
}; };
@ -220,3 +221,24 @@ Contour::IsConvex(const Arguments &args) {
return scope.Close(Boolean::New(isContourConvex(cv::Mat(self->contours[pos])))); return scope.Close(Boolean::New(isContourConvex(cv::Mat(self->contours[pos]))));
} }
Handle<Value>
Contour::Moments(const Arguments &args) {
HandleScope scope;
Contour *self = ObjectWrap::Unwrap<Contour>(args.This());
int pos = args[0]->NumberValue();
/// Get the moments
cv::Moments mu = moments( self->contours[pos], false );
Local<Object> res = Object::New();
res->Set(String::NewSymbol("m00"), Number::New(mu.m00));
res->Set(String::NewSymbol("m10"), Number::New(mu.m10));
res->Set(String::NewSymbol("m01"), Number::New(mu.m01));
res->Set(String::NewSymbol("m11"), Number::New(mu.m11));
return scope.Close(res);
}

1
src/Contours.h
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@ -24,5 +24,6 @@ class Contour: public node::ObjectWrap {
static Handle<Value> BoundingRect(const v8::Arguments&); static Handle<Value> BoundingRect(const v8::Arguments&);
static Handle<Value> MinAreaRect(const v8::Arguments&); static Handle<Value> MinAreaRect(const v8::Arguments&);
static Handle<Value> IsConvex(const v8::Arguments&); static Handle<Value> IsConvex(const v8::Arguments&);
static Handle<Value> Moments(const v8::Arguments&);
}; };