Same output threshold image

asked 2016-10-03 08:38:37 -0600

greenworld gravatar image

updated 2016-10-04 05:54:53 -0600

StevenPuttemans gravatar image

I use three filter as below, each one if I run individual work well(three output image 'imgThresholded' is difference), but if I use continuously all, the output image 'imgThresholded' is the last one. 

void filterBlack(){
    inRange(imgHSV, Scalar(Hblack.iLVal / 2, Sblack.iLVal, Vblack.iLVal*2.55), Scalar(Hblack.iHVal / 2, Sblack.iHVal*2.55, Vblack.iHVal*2.55), imgThresholded);
    erode(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(3, 3)));
    dilate(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(3, 3)));
    //morphological closing (fill small holes in the foreground)
    dilate(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(3, 3)));
    erode(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(3, 3)));
    imshow(thhdWindow, imgThresholded);
}

void filterBlue(){
    inRange(imgHSV, Scalar(Hblue.iLVal / 2, Sblue.iLVal, Vblue.iLVal*2.55), Scalar(Hblue.iHVal / 2, Sblue.iHVal*2.55, Vblue.iHVal*2.55), imgThresholded);
    erode(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(3, 3)));
    dilate(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(3, 3)));
    //morphological closing (fill small holes in the foreground)
    dilate(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(3, 3)));
    erode(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(3, 3)));
    imshow(thhdWindow, imgThresholded);
}

void filterRed(){
    inRange(imgHSV, Scalar(Hred.iLVal / 2, Sred.iLVal, Vred.iLVal*2.55), Scalar(Hred.iHVal / 2, Sred.iHVal*2.55, Vred.iHVal*2.55), imgThresholded);
    erode(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(3, 3)));
    dilate(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(3, 3)));
    //morphological closing (fill small holes in the foreground)
    dilate(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(3, 3)));
    erode(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(3, 3)));
    imshow(thhdWindow, imgThresholded);
}
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Comments

Hah that is because imgThresholded is a pointer, and thus calling functions subsequently will work on the same data, starting from imgHSV. Inside your function you want to have at least a local imgThresholded defined, in which you want to store the result. Global variables never work well ...

StevenPuttemans gravatar imageStevenPuttemans ( 2016-10-04 05:56:30 -0600 )edit
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