C++ OpenCv Randomly selecting the pixels having atleast 16 pixels space from one another

asked 2016-02-18 08:44:16 -0600

Manan
1

Hi Guys,

I have currently an image having dimensions (2800 * 3800), I want to access the pixels randomly and store those pixel's in a vector. What Actually I want is that I should not be be storing or getting pixels which are unique and also these should have a space of 16 i.e consecutive 16 pixels difference between all pixels and Lastly I have to select atleast 300 Pixels.

Suggest me something really robust.

Thanks.

edit retag flag offensive close merge delete

Comments

If you want a vector of values that may be pixels values, then use a rng for filling it with values ((example)[http://docs.opencv.org/2.4/doc/tutorials/core/random_generator_and_text/random_generator_and_text.html])... What is the vector for?

thdrksdfthmn ( 2016-02-18 09:47:56 -0600 )edit

@thdrksdfthmn okaye but I want to have combination of 300 pixels having gap of atleast 16 pixels. And If I generate random number for 3800 or 2800 i cant get unique pixels becasuse 300*16 is greater than both 3800 and 2800..!! any suggestion to have a combine Rows & Cols. could be utilize then we can have more unique combinations.

Manan ( 2016-02-18 10:23:02 -0600 )edit

Ok, what I meant is: a pixel is usually 0..255, so you have to generate a value between 0 and 255 and push it in the vector, when you have 16 (or how many you want) you do the thing with the vector, for example you put it in a cv::Mat. But I think I misunderstood... What you want is to have at least 300 positions that are not closer than 16 pixels one to another?

thdrksdfthmn ( 2016-02-18 11:00:40 -0600 )edit

@thdrksdfthmn I want is to have at least 300 positions that are not closer than 16 pixels one to another. Also my image MAt has 2800 rows and 3800 columns.

Manan ( 2016-02-18 13:27:51 -0600 )edit

add a comment

cv::RNG rng(cv::getTickCount()); // for having each time different numbers int lo = 16; int hi = max(16, sqrt(image.cols * image.rows / 300) - 1); // maximum distance between points std::vector< uchar > distantPixels; cv::Point currentPos(0,0); while (currentPos.y < image.rows) { while (currentPos.x < image.cols) { distantPixel.push_back(image.ptr< uchar >(currentPos.y)[currentPos.x]); currentPos.x += rng.uniform(lo, hi); } currentPos.x = 0; currentPos.y += rng.uniform(lo, hi); }

Comments

Please do the remarks if there is any ;)

thdrksdfthmn ( 2016-02-19 06:46:35 -0600 )edit

You should check if the pixel is in the image after you added the random number.

FooBar ( 2016-02-19 06:56:08 -0600 )edit

Now it will always start with the first pixel (0, 0) but you will never get outside the image borders

thdrksdfthmn ( 2016-02-19 09:04:46 -0600 )edit

Every row of your pixels will start at zero. Why not initalize currentPos with random and also reset x to random(lo,hi) instead of zero?

FooBar ( 2016-02-19 10:10:15 -0600 )edit

add a comment

C++ OpenCv Randomly selecting the pixels having atleast 16 pixels space from one another

Comments

1 answer

Comments

Links

Question Tools

Stats

Related questions

C++ OpenCv Randomly selecting the pixels having atleast 16 pixels space from one another edit

Comments

1 answer

Comments

Links

Question Tools

Stats

Related questions

C++ OpenCv Randomly selecting the pixels having atleast 16 pixels space from one another