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3
votes
1answer
48 views

Comparing absolute values when determining zero crossing in 2D image

I am trying to implement an algorithm for finding the zero crossing (check that the signs of all the entries around the entry of interest are not the same) in a two dimensional matrix, as part of ...
0
votes
0answers
37 views

Converting printable documents to TIFF in .NET [on hold]

I have been handed a requirement to convert a series of files into TIFF format as they come into my application. The requirement states that these files may originally be in any printable format ...
3
votes
1answer
34 views

Difference in orientation of Sobel mask gives different edge detector result

I am implementing a Canny Edge detector for a class which I have based off the code found here. For the first derivative mask that I will convolve with the image, I am using the Sobel mask, although ...
1
vote
0answers
16 views

Laplacian of Gaussian Edge Detector Being Affected by Change of Mask Size [migrated]

For a class, I've written a Laplacian of Gaussian edge detector that works in the following way. Make a Laplacian of Gaussian mask given the variance of the Gaussian the size of the mask Convolve it ...
4
votes
2answers
114 views

Can I use machine learning for screening experimental data?

I am a experimental physicist. In our research, we have our experimental data in a 400*400*400 matrix(x, y, z axis of a 3d space), each entry is associated with a value("brightness"). We expect the ...
1
vote
0answers
26 views

Colour curves tool for “value” channel

I'm trying to write a program to read GIMP curves files and apply them to an image. I have successfully implemented the curves for the red, green and blue channels, but I can't get it working for the ...
1
vote
2answers
100 views

Algorithm for searching images within images [closed]

I can't google this question, because I can't come up with a good query, so let me describe what I want and maybe someone will be able to suggest a way forward for me. I need to solve the following ...
2
votes
1answer
317 views

Stereo images rectification and disparity: which algorithms?

I'm trying to figure out what are currently the two most efficent algorithms that permit, starting from a L/R pair of stereo images created using a traditional camera (so affected by some epipolar ...
2
votes
2answers
123 views

Effective and simple matching for 2 unequal small-scale point sets

I need to match two sets of 3D points, however the number of points in each set can be different. It seems that most algorithms are designed to align images and trimmed to work with hundreds of ...
3
votes
1answer
326 views

Getting started with object detection - Image segmentation algorithm

Just getting started on a hobby object-detection project. My aim is to understand the underlying algorithms and to this end the overall accuracy of the results is (currently) more important than ...
4
votes
1answer
142 views

How to maintain standard quality of images uploaded by many users?

We're developing a site where individuals (store owners) will be able to take pictures and upload to the site. Our biggest concern is the variance in quality of pictures across the site. The options ...
2
votes
1answer
124 views

Algorithm for deciding change in gesture

I am developing an application where I am taking dynamic gestures as input and then mapping them to keyboard controls. By dynamic gesture, I mean for example hand moving from left to right or hand ...
2
votes
1answer
855 views

OCR API (in Java) with Word (NOT MS-WORD) extraction [closed]

My Situation I need to develop an application which does crowd-sourced Image-To-Text service (just like google's reCaptcha). So I need an OCR API which can find words in an image with some text. ...
10
votes
1answer
756 views

Computational Complexity of Correlation in Time vs Multiplication in Frequency space

I am working with 2d correlation for image processing techniques (pattern recognition etc...). I was wondering if there is a theoretical approach on how to tell when to use multiplication in frequency ...