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0
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1answer
62 views

Baseline correlation for template matching

In normal cross-correlation or convolution between a signal and a template(say a small portion of the signal) the template is moved along length of the signal without changing the amplitude offset of ...
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0answers
14 views

Computing distance between two sattalite images

I want to make distance estimation from matching two sattalite images. Images taken from same height and same orientation (top middle shows north). Training images taken from google map and target ...
0
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1answer
75 views

Finding aberrations and/or unknown features in an image

Is it possible to find unknown featues in an image or in other words aberrations from a normal image of some type? For example: Imagine you have lots of pictures of different faces, so all are ...
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0answers
15 views

How to combine SURF and Harris points

As we know at Matlab, there is function to detect Harris or SURF feature individually. Then I need to combine these two list of features from both the Harris and SURF to make the matching more ...
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0answers
16 views

Log polar matching in extended space

Can somebody explain how the matching in "extended space", which is shown on page 1429 (figure 7c) in this document?. Is this just the same logpolar transformed image next to each other multiple times ...
0
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0answers
14 views

What is the best way to match a grid to a messy grid in a target image?

I have a target set of images with a grid of blobs, which supposedly include a hypothetical dot that is supposed to be the source of the blob. However the blobs are not restricted to any given shape ...
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0answers
422 views

Why Normalized Cross Correlation Score of different templates is high?

I am using OpenCv's built in template matching function to search for an object in image. I am using Normalized Cross Correlation Method.The function is returning a value which I think indication of ...
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0answers
100 views

Template matching results when the template is not on the original image

For testing purposes I'm building a bot that clicks on buttons in the screen. I have a folder with all the possible buttons that needs to be pressed and the application being tested only has one ...
0
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1answer
34 views

Avoid saturated pixels in cross-correlation computation

I am doing template maching using Normalized Cross-Correlation for measuring similarity between template and image. However, some images from my dataset contain saturated pixels (overshoot) which ...
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0answers
21 views

Excluding the scatter points from a feature

I have a set of data points which are supposed to settle on a locus and follow a pattern, but there are some scatter points in the main locus which their existence in the data can increase the ...
0
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2answers
477 views

Template matching or object recognition?

Problem: I have a photo of an object (a manufactured part like the attached photo below), using my Andoird phone camera I want to verify if the object in camera preview matches to the template or not. ...
1
vote
2answers
343 views

fast 2D cross correlation algorithm

I want to match a small template to a larger image, that the distance between the template and the subimage with the same size of the template is minimized. It can be solved directly or by applying 2D ...
4
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1answer
508 views

Ambiguous results of phase correlation in pattern recognition

We are using phase correlation to find pattern on image and what we get is 15% of results is spurious. Ours pattern has 32x32 pixels and image for research has 32x512 pixels. So we put Pattern to ...
4
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2answers
1k views

Using DTW on the MFCC's to match a spoken word to a template

I am trying to code a simple algorithm in Matlab that would be used to detect a single word. The goal would be to have a user record the word one time to act as a template, then make the user repeat ...
2
votes
1answer
247 views

how could correlation-based image patches matching works?

In general, correlation-based image matching can be referred to as $$c(I_1,I_2) = \sum_{x \in patch} f(I_1(x), I_2(x))$$ , I do think normalized cross-correlation like $$ncc(I_1, I_2) = \sum_{x \in ...
2
votes
1answer
789 views

Questions about log polar transform

I read various papers about the log polar transform and its application on template matching with images and have some questions: In "Image Registration Using Log Polar Transform and Phase ...
6
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1answer
147 views

How to tell how likely a signal is present in another one? (variance unknown)

I know this is probably a simple question, but I haven't been able to find a satisfactory answer anywhere... Say you have a time series signal of finite length N. Call it $y[n]$. It looks like a ...
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0answers
582 views

How to recognize a zebra crossing from top view using OpenCV?

How to recognize a zebra crossing from top view using OpenCV? It is not a straight zebra crossing - it has some twists and turns. I have some ideas: parallel line detection, but the available ...
8
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3answers
7k views

Scale and Rotation invariant Template Matching

I'm looking for a method for scale and rotation invariant Template matching. I already tried some, but they didn't work so good for my examples or took for ever to execute . SIFT and SURF Feature ...
10
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1answer
196 views

Advise on detecting anatomical landmarks in a CT reconstructed volume

I'm trying to automatically detect some medical defined anatomical landmarks in a CT reconstructed volume. Medical doctors use these landmarks to measure some patient specific parameters. I have ...
11
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2answers
536 views

Necessary image processing operations before template matching

Well, this may show I didn't take image processing class. I have this template to match an object in images. But real object in images, for example, does not look like that but the second image. What ...