What do I look for in a post? Clarity and Contribution.

NO vote: If the post is clear, but makes no contribution OR if the post is unclear, but makes a contribution (though I will try to improve the clarity either by comments or direct edit).

UP vote: If the post is clear and makes a contribution.

DOWN vote: If the post is unclear and makes no contribution (though I will try to see if I've missed something by commenting).

2d
awarded Popular Question
Dec
17
comment Why Normalized Cross Correlation Score of different templates is high?
Right. I'm wondering if the diff operation is causing too much change to the template compared with the image. Perhaps look at using a high-pass filter as the aim is to make the spectrum "whiter" (closer to uniform across all frequencies). The whiter the spectrum, the narrower the image's autocorrelation, so the bigger difference between matching and non-matching areas.
Dec
17
comment Buying property in India : joint owner
Agreed, the issue of selling the property should be able to be done via a Power of Attorney. That might be a good thing to give the father anyway if the OP is likely to be in the US for a while: that way the father can deal with any paperwork that comes the OP's way.
Dec
17
comment Why Normalized Cross Correlation Score of different templates is high?
The trouble with histogram equalization is that it will make the statistics of everything look the same. That may be a bad thing if you're using NCC. Try some simpler pre-processing of the image: 1) remove the mean. 2) do a simple whitening (e.g. diff the rows from each other). What you're aiming for is to make the template look as different from the rest of the image as possible.
Dec
17
comment Why Normalized Cross Correlation Score of different templates is high?
Without seeing them, my guess is that you're not subtracting the mean. See pre-whitening : sites.google.com/site/kootsoop/prewhitening
Dec
16
comment Are convolution and deconvolution kernel the same?
The deconvolution operation associated with $g$ is the same as the convolution of the inverse of $g$. The issue is that deconvolution is generally not thought of as a kernel operator; you need to use $g^{-1}$ (the inverse of $g$).
Dec
16
revised Are convolution and deconvolution kernel the same?
Deconcolute -> Deconvolve
Dec
15
comment SRAD code in matlab it doesn't work
As the closure comment says, this is a brogramming question which should be asked on StackOverflow.
Dec
15
revised FIR filter design with frequency sampling method - setting proper phase response for IDFT
Format changes only
Dec
13
reviewed Approve suggested edit on The Nyquist-Theorm behind the fft
Dec
12
comment Filters performance analysis
OK, so it look like your first filter is OK. Your second filter looks like it's an "all stop" filter (i.e. no frequencies get through).
Dec
11
answered Filters performance analysis
Dec
10
comment Filters performance analysis
Yes, that still doesn't quite look right. I'll try posting an example later tonight (my time; about five hours from now).
Dec
9
comment Filters performance analysis
Your filter cut off frequency (8Hz) is very, very small compared with your sampling frequency (6500Hz). That probably means the filters you have designed are not doing what you want: this can be seen by the VERY large attenuation at higher frequencies --- not what is wanted in a high pass filter. You should either make the cut off frequency much higher, or seriously down-sample your data (after low-pass filtering it to avoid aliasing).
Dec
9
comment Use of exit instead of echo changes output mime type
@karanthakkar : Yes, that's what we are doing. If I print out in debug immediately before the exit the content type is set to application/json, however the actual content type is set to text/html. The same thing does not happen with the echo branch.
Dec
8
revised Use of exit instead of echo changes output mime type
edited title
Dec
8
comment Use of exit instead of echo changes output mime type
:-) Couldn't agree more.
Dec
8
comment Use of exit instead of echo changes output mime type
:-) Yes, I wasn't copying code, just trying to make it look pretty. I've edited it to be correct (the actual code already is).
Dec
8
revised Use of exit instead of echo changes output mime type
deleted 1 character in body
Dec
8
comment Use of exit instead of echo changes output mime type
OK. That confirms my suspicion. Thanks for the feedback, much appreciated. I'll leave it until tomorrow before ticking, in case someone comes back with another idea.
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