All Questions
Tagged with algorithm transformations
16
questions
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0
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Automating equirectangular horizon detection in 360 images
I would like to programatically identify pitch and roll numbers that will level the horizon on each frame in a series of equirectangular 360 panorama images.
Here's why. I recently ended up with a ...
- 111
1
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0
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26
views
How to morph a enclosing mesh according to the enclosed mesh?
I am quite new to meshing and mesh manipulation. I am working on a problem consiting of meshes $A$, $B$, and $C$. The mesh $C$ completely encloses the meshes $A$ and $B$ as shown in the attached ...
- 11
0
votes
1
answer
362
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Rotate a Bitmap with Shearing
I am rotating a bitmap using the three shear algorithm documented in these articles [1][2].
From about 0-90°, the quality is acceptable, but beyond that it gets progressively more distorted until it's ...
1
vote
1
answer
2k
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Rotating a Bitmap
I would like to rotate an bitmap image using math. I have two issues with my current implementation: the pixel-by-pixel rotation of the copied bitmap is extremely slow and it is leaving gaps between ...
-1
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2
answers
786
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How can i wrap the earth image around a 3D Sphere using OpenGL, GLFW, GLAD, GLM?
Please help me out with this thing and currently i am a little more than a beginner so please tell me in that context. i don't need any obsolete methods for creating this like using GLUT or GLEW.can ...
- 27
0
votes
1
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120
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How to scale primitive shapes [in Blender] so that they are within a [unit] sphere?
I wonder how is it possible to scale all shapes so that they are within boundaries of a [unit] sphere? I know how to do this for a cube: if radius of the sphere is S...
- 241
2
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answers
28
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How can I register an articulated model to noisy predictions?
Given point sets $Y$ and $M$, I'd like to register articulated $M$ to $Y$ without changing the edge distances of $M$. The point correspondences between $Y$ and $M$ are known and points have a fixed ...
- 233
2
votes
1
answer
237
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Deciphering Affine/Projective Transformation Code
I've spent about 2 days trying to understand this piece of code (from here) that applies an affine/projective transformation to an image. I will link bits of the code that I'm struggling to understand ...
- 23
2
votes
1
answer
192
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Image resize with pixel accumulation?
I have a grayscale image and want to "resize" it in terms of "pixel concentration".
That means I divide the source image x_old * y_old into ...
- 317
6
votes
2
answers
1k
views
Color transform algorithm (that also works on saturation and value/lightness)?
To change particular colors in an image, generally you multiply the RGB by a transformation matrix. Image manipulation programs such as gimp & photoshop have a selective color change function that ...
- 423
2
votes
0
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50
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detect blurred zones after conversion to black & white
I'm working on a document storage project and i found a problem.
After converting/compressing a scanned document to black & white sometimes, some areas of the document are unreadable because ...
- 21
3
votes
1
answer
2k
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Image rotation algorithm
I would like to rotate a raster image by an arbitrary angle. I don't really care for speed: the rotation should be of highest quality possible. Could someone please suggest a suitable algorithm?
I'm ...
- 1,459
3
votes
1
answer
353
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Unwinding an image on a spiral to make it long and flat
Here's an odd intellectual puzzle. Something I was daydreaming about on a train - but the maths are somewhat beyond me. How would someone go about un-winding a spiral to produce a long flat image? ...
- 139
3
votes
1
answer
124
views
culling meshes across mulitple layers
I am implementing foveated rendering. My FBO is divided into 2 layers which are concentric. The first layer covers 1/3 of the Framebuffer whereas the second one covers the rest of the screen. Now I ...
- 131
5
votes
2
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228
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How to get the transform amount from a screen vector and a direction vector?
I am working on the move tool in a 3D modeling software. I need to know how much to move when the user drags an axis of the gizmo (for example along the x axis).
I have the 2D vector describing how ...
- 377