Correlation or Cross-Correlation is a measure of similarity of two waveforms as a function of a time-lag applied to one of them.
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Phase Correlation - Poor Performance on Noisy/Blurred Images?
I have successfully tested 1D phase correlation algorithm to determine vertical shift between two synthetic images.
When I moved to real images, however, it is not able to detect translation at all ...
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55 views
Phase Correlation and Negative Shifts
I am implementing phase correlation algorithm to determine shift between two images.
It generally works, but I am not sure how to interpret the resulting shift.
Pseudocode:
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3answers
102 views
Calculating similarity between two signal plots
I have two plots, each having frequency as x-axis and Gain as y-axis. By taking one data set as a reference I have to calculate similarity between them.
The graphs have same values on the x-axis and ...
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93 views
Correlation between 2 functions
I have a periodical function $f(x)$ that is sampled in time, at a rate of 1 millisecond.
Together with this, I also have a second function $t(x)$.
I want to find the correlations between periods ...
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34 views
Implement average as correlation
I have a MxN image matrix in, and need to get out matrix out size MxN as follows:
Each point out[i,j] is the average of all in[i,j] inside a window size WxW (if boundary allows). For example if W=10
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188 views
Why do you get instantaneous phase by calculating correlation with a carrier signal?
I am somewhat new to DSP. I'm trying to implement BPSK by following this Python QAM tutorial.
My code seems to work, but I really just ported the tutorial's Python code to C++, and do not understand ...
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2answers
98 views
image correlation without fft
I want to stitch 2 images by crosscorrelation measure, but I don't want to use fft.
I tryed this but something seems to be wrong.any suggestions?
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1answer
146 views
Audio codec analysis in MATLAB: crosstalk
I am currently making an analysis of a codec system that can encode up to 2 wave files into 1 file and decode it. Here is a simple illustration:
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1answer
120 views
Can FFT Substitute Correlation for This Case?
I'm trying to determine frequency of a repeating pattern in a time series. The sampling rate 100Hz and the pattern repeats itself with periods between 0.5 second and 1.25 second. This corresponds to a ...
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142 views
Correlation filter output range normalization
I'm developing correlation filters based image recognition.
I implemented MACE correlation filter in matlab:
training code:
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1answer
120 views
Matching delayed signals
I have pairs of 1d digitised waveform signals which are almost identical - except there are sections which are the same in both but one is delayed slightly.
I need to find sections and the delay with ...
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1answer
104 views
Component of one signal along the another
Whenever we need to find component of one signal along another signal we can do so by the help of dot product. I want to as if this method is valid for all kind of signals. Are there any restrictions ...
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619 views
Detection of lines in a point cloud
What are the best solutions to detect line in a point cloud? Comparison being made with and between Hough Transform, Radon Transform, RANSAC (see wikipedia) and Brute-Force Search (see wikipedia).
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275 views
Is a wavelet-based correlation measure worth any additional computational overhead?
I have used both correlation and coherence as measures of correlation between signals. I was thinking that a time-frequency approach would give me the best of these worlds.
My question is whether ...
