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How to find out what type of a Mat object is with Mat::type() in OpenCV
...to help with identifying your opencv matrices at runtime. I find it useful for debugging, at least.
string type2str(int type) {
string r;
uchar depth = type & CV_MAT_DEPTH_MASK;
uchar chans = 1 + (type >> CV_CN_SHIFT);
switch ( depth ) {
case CV_8U: r = "8U"; break;
cas...
filename and line number of python script
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Does using this method have any performance impact (like minor increase in run time or more CPU needed ) ?
– gsinha
Dec 14 '14 at 5:41
8
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How to avoid explicit 'self' in Python?
...stion to remove python from it. I think that it belongs there. (and thanks for the answer!)
– bguiz
Nov 1 '10 at 3:25
3
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How to write a large buffer into a binary file in C++, fast?
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int main()
{
FILE* pFile;
pFile = fopen("file.binary", "wb");
for (unsigned long long j = 0; j < 1024; ++j){
//Some calculations to fill a[]
fwrite(a, 1, size*sizeof(unsigned long long), pFile);
}
fclose(pFile);
return 0;
}
I just timed 8GB in 36sec, whi...
Do try/catch blocks hurt performance when exceptions are not thrown?
... block. She and an IT representative suggested this can have effects on performance of the code. In fact, they suggested most of the code should be outside of try/catch blocks, and that only important sections should be checked. The Microsoft employee added and said an upcoming white paper warns aga...
What does pylint's “Too few public methods” message mean
...
+1 for "pylint doesn't know what's best" - use your own judgement but as a rule, if what you need is a "struct", use a dict or namedtuple. Use a class when you want to add some logic to your object (for example, you want stuff t...
Pythonic way to find maximum value and its index in a list?
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There are many options, for example:
import operator
index, value = max(enumerate(my_list), key=operator.itemgetter(1))
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How do you run your own code alongside Tkinter's event loop?
My little brother is just getting into programming, and for his Science Fair project, he's doing a simulation of a flock of birds in the sky. He's gotten most of his code written, and it works nicely, but the birds need to move every moment .
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Checking images for similarity with OpenCV
...d decades ago as a means to find picture simmilarities. The idea is that a forest will have a lot of green, and a human face a lot of pink, or whatever. So, if you compare two pictures with forests, you'll get some simmilarity between histograms, because you have a lot of green in both.
Downside: i...
Hashing a dictionary?
For caching purposes I need to generate a cache key from GET arguments which are present in a dict.
11 Answers
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