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Questions tagged [edge-detection]

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3
votes
1answer
110 views

Rounding a corner formed by Arc and Line

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 ...
1
vote
0answers
82 views

Why does this edge detect show different results for the same color combinations?

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 ...
5
votes
1answer
646 views

Is it better to blur the input or output of an edge detection shader for noise reduction?

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 ...
5
votes
1answer
586 views

GLSL - Merge two textures

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. ...
4
votes
1answer
1k views

Sobel edge detection line thickness

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 ...
10
votes
1answer
8k views

OpenGL GLSL - Sobel Edge Detection Filter

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: ...
1
vote
1answer
48 views

How would I create a virtual cabling system?

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 ...
5
votes
1answer
482 views

Controlling Sobel edge thickness

I'm using a Sobel filter to draw an outline in a shader. How do I control its thickness? Here's my outlining code: ...
9
votes
2answers
4k views

OpenGL - Detection of edges

I'd like to load arbitrary meshes and draw thick black lines along the edges to get a toon-shading like look. I managed to draw a black silhouette around the objects by using the stencil buffer. You ...
3
votes
1answer
2k views

How to crop with edge-detection using imagemagick [closed]

Let's say I have an image of an object against a white background. I want to crop so that the image fills the available space. This takes 10px off: ...
7
votes
2answers
153 views

How can I detect edges between different colours of the same brightness?

I'm looking for an algorithm that can identify edges across which colour is changing sharply, rather than just finding changes in brightness. Is this just a matter of using a different colour space ...