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POGet largest structure (Canny Edge Detection)?
 

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  1. POGet largest structure (Canny Edge Detection)?
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    <p>I am using the library found at this link: <a href="https://code.google.com/p/simple-iphone-image-processing/" rel="nofollow">https://code.google.com/p/simple-iphone-image-processing/</a></p> <p>I implemented Image.h and Image.mm and I get the Canny Edge Detection filter by using this code:</p> <pre><code>- (IBAction)findEdges { ImageWrapper *greyScale=Image::createImage(_sourceImage, _sourceImage.size.width/4, _sourceImage.size.height/4); ImageWrapper *edges=greyScale.image-&gt;gaussianBlur().image-&gt;cannyEdgeExtract(0.4,0.6); // show the results UIImage *newimageView = edges.image-&gt;toUIImage(); _imageView.image = newimageView; } </code></pre> <p>Now I notice there is a method called <code>findLargestStructure</code>. This is that method:</p> <pre><code>void Image::findLargestStructure(std::vector&lt;ImagePoint&gt; *maxPoints) { // process the image std::vector&lt;ImagePoint&gt; points; points.reserve(10000); for(int y=0; y&lt;m_height; y++) { for(int x=0; x&lt;m_width; x++) { // if we've found a point in the image then extract everything connected to it if((*this)[y][x]!=0) { extractConnectedRegion(x, y, &amp;points); if(points.size()&gt;maxPoints-&gt;size()) { maxPoints-&gt;clear(); maxPoints-&gt;resize(points.size()); std::copy(points.begin(), points.end(), maxPoints-&gt;begin()); } points.clear(); } } } } </code></pre> <p><strong>My question is</strong>, what exactly does this method do and how can I call it/use it from Objective C code? Pretty much my goal in the end of all of this is to use the Canny Edge Detection this library has and derive a CGRect somehow out of it by using the average of the biggest structure's edge points and then use that in my app.</p> <p>So will the above method return a vector of those points or not? I am familiar with Objective-C but I am not that great with C++.</p> <p>Any help/tips would be greatly appreciated!</p>
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    1. USSimplyKiwi
    1. USSimplyKiwi
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    1. COto call c++ function from objective c you have to convert your .m file as .mm file after this you can call this method
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      1. POGet largest structure (Canny Edge Detection)?
      1. USSunny Shah
    2. COYes, I have done so and that is not the issue. The issue I am having is how do I ACTUALLY call it from Objective C code. And my other issue is understanding the method properly and doing what I need to achieve (that I specified in the bottom of the question).
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      1. USSimplyKiwi
 

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