OpenCV detect color Automatically -

is there possible way make color blob detection automatically detect specified color without pressing ?

ex i'll specify range of color want automatically detect color same range.

you need use cv::inrange , define range of colors (r1,g1,b1) (r2,g2,b2). e.g.:

cv::inrange(input, cv::scalar(0,140,0), cv::scalar(160,255, 160), output);