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10
votes
1answer
920 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 ...
4
votes
2answers
122 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 ...
4
votes
1answer
155 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 ...
3
votes
1answer
64 views

Determine how two images should be combined to produce the original image

Suppose I have two similar images as follows Image 1 (base) Image 2 (target) The second image is basically a variation of the first image, except with a green oval slapped on top (indeed, I ...
3
votes
1answer
57 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 ...
3
votes
1answer
75 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 ...
3
votes
1answer
390 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 ...
3
votes
1answer
334 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
1answer
126 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
904 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. ...
2
votes
2answers
145 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 ...
1
vote
1answer
83 views

Which Computer Vision / Image Processing technique would solve light imbalance in images?

Given a colour image whose light intensity is dim at the edges and bright in the middle, such as [dim bright dim], which computer vision technique would be recommended to correct this imbalance? ...
1
vote
2answers
118 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 ...
1
vote
0answers
34 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 ...
0
votes
1answer
51 views

Picking an image from a set of images that is most likely to be compelling to a typical viewer [closed]

Given a set of images on a webpage, what's a good way to pick a compelling image that is also representative of the webpage? The use case is displaying an image along with a description of a URL to a ...
0
votes
1answer
80 views

What algorithms would suit image colour summarization?

I would like to analyse a set of hundreds of thousands of product images (clothing, electronic goods etc) and retrieve the dominant colours in each. I'm only interested in the top 3 or 4 colours. The ...
0
votes
0answers
39 views

image processing algorithm to find solid square vs square outline in video frames

I am working on a system to detect an "embedded" 12 bit number within a series of frames that are recorded inside an mp4 file. The point of it is to automatically identify the "take", and also trim ...
-2
votes
0answers
57 views

Photoshop/GIMP curves tool - how does it work internally [on hold]

PROBLEM I've been given a task to understand and make a tool similar to Photoshop's/GIMP's curves tools. I'm using c++ with Qt (and can use any library that can be used commercially). I'm a newbie ...