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Questions tagged [edge-detection]

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18 questions
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1 answer
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I have a Mind Map image (PNG file) in which I want to blur programmatically all text, so that the letters are unreadable. All other elements of the Mind Map should remain crisp and clear. A sample ...
halloleo's user avatar
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1 vote
0 answers
53 views

Consider a 2-dimensional polygon with unknown vertices $V_1, \dots, V_n \in \mathbb{R}^2$. Given a random set of points $p_1,\dots, p_m \in \mathbb{R}^2$ lying approximately on the perimeter of such a ...
matteogost's user avatar
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3 votes
0 answers
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I'm trying to implement a post-processing pass to detect silhouette-edges from depth data. (by silhouette-edge of a triangles mesh I mean the triangle edges shared by a front and a back-facing ...
leone ruggiero's user avatar
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1 answer
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I need to, starting from one face, iterate over the rest of the faces until I reach the first facet. For this I can use twin, start, end or other info of halfedges, faces, vertex. That is, I need to ...
JoungCPPser's user avatar
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1 answer
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I am trying to implement next/prev of edges in half-edge data structure. But I ran into this question. If there are two holes with a common vertex, will the closed loop of the edges run as in the ...
JoungCPPser's user avatar
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Sobel edge detection is pretty much the quintessential way to get edges out of an image. It however suffers from certain quirks. One example is, because it's gradient, based certain surfaces exhibit ...
Makogan's user avatar
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2 votes
1 answer
2k views

I would like to segment picture of cloths in order to remove the background. The pictures come from online retailers, they usually have an homogeneous white background. Using Canny edge detector ...
Nicolas Scotto Di Perto's user avatar
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3 votes
1 answer
1k views

Given shapes like these, which contain just Arcs and lines, I want to round all its corners with certain radius. I know the vertices of the lines & arcs these shapes. I can round the corners of a ...
user3453636's user avatar
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1 vote
0 answers
147 views

I'm researching highlighting accessible color contrast via filter operations. I have a test screenshot of SRGB hex values compared with WCAG's official contrast algorithm: I converted it to its ...
Tigt's user avatar
  • 111
4 votes
1 answer
3k views

To reduce noise of edge detection the norm seems like it is to apply a blur. However, is it generally better to apply the blur to the input of the edge detection. The input in my case being the depth ...
Syntac_'s user avatar
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5 votes
1 answer
2k views

I would like to display arbitrary 3d meshes with black edges (black outline, black ridges, etc.). Thereby I have created two different textures: One color texture and one anti-aliased edge texture. ...
enne87's user avatar
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3 votes
1 answer
4k views

My goal is to implement an edge detection algorithmus that is capable to find edges of arbitrary 3d meshes. I want to find the edges by detecting normal discontinuities. Furthermore, I want the edges ...
enne87's user avatar
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13 votes
1 answer
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With respect to this topic I've successfully implemented the Sobel Edge Detection filter in GLSL. Here is the fragment shader code of the filter: ...
enne87's user avatar
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1 vote
1 answer
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I am trying to devise a GUI system that functions as a virtual patchbay, as seen in something like Logic Studio's environment editor, or seen in virtual synthesizers that use virtual patchcables. I'm ...
achacha's user avatar
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5 votes
1 answer
2k views

I'm using a Sobel filter to draw an outline in a shader. How do I control its thickness? Here's my outlining code: ...
SurvivalMachine's user avatar
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