Damiles Blog. A computer vision, OpenCV and IT technology blog.

  • Oct 26, 2008

    GNUPLOT - 3d plot surface

    For 3d plot gnuplot use command splot.

    splot sin(sqrt((x*x+y*y)))/sqrt(x*x+y*y) t "weaves"

    Gnuplot surface wireframeGnuplot surface wireframe

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  • Oct 23, 2008

    AWK. Calculate mean, min and max

    AWK is a general purpose programing language that is designed for processing text-based data. This unix command is very powerful and with it we can calculate the mean, min and max of a data stored in file.

    data.txt:

    10
20
50
100
200
500

    awk command:

    awk '{if(min==""){min=max=$1}; if($1>max) {max=$1}; if($1< min) {min=$1}; total+=$1; count+=1} END {print total/count, min, max}' data.txt

    Result:

    146.667 10 500
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  • Oct 21, 2008

    OpenCV & OpenGL

    In this tutorial we see how we can acces to OpenCV functions and use the images we process with it to use in our OpenGL program.

    To use an OpenCV image (IplImage) and use it as an OpenGL textures we mus use this function.

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