I am trying to detect red color using inRange keyword. But I cannot check it inside If statement. If red color comes then print It is red color

asked 2019-04-14 00:36:12 -0600

Abdusoli
6 ●1 ●1

Mat1b mask1, mask2;
inRange(hsv, Scalar(173, 70, 50), Scalar(179, 255, 255), mask1);
imshow("RedDetect", mask1);

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see tutorial_threshold_inRange

sturkmen ( 2019-04-14 03:59:01 -0600 )edit

But how can I check inside If statement. For example If color is red then call some function

Abdusoli ( 2019-04-14 04:41:16 -0600 )edit

Also, notice that the H of red color in HSV color space may range from 0~10 and 170~180, you might have to consider these two conditions.

gino0717 ( 2019-04-17 00:40:58 -0600 )edit

Thank you for help. I will take into account

Abdusoli ( 2019-04-18 03:16:21 -0600 )edit

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answered 2019-04-15 04:47:35 -0600

StevenPuttemans

20029 ●16 ●82 ●207 http://stevenputtemans...

inRange(hsv, Scalar(173, 70, 50), Scalar(179, 255, 255), mask1) returns a mask with white pixels giving you the location of the pixels that are within this range. You now have to make logic that has some sort of boolean return value.

Now do int number_pixels = countNonZero(mask1) and then threshold that value. For example, if more than 40 pixels respond, this is not noise and we execute the function.

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Sorry, I am new to OpenCV. Should I threshold number_pixels? How can threshold it?

Abdusoli ( 2019-04-15 08:18:12 -0600 )edit

By basically creating an if condition. So for example: if( number_pixels > 50 ){ execute_your_function(); }

StevenPuttemans ( 2019-04-16 02:44:13 -0600 )edit

Thank you bro for your help. I have another question appeared. How can I detect only red circle shapes. my car stops when red color comes regardless of shapes, including triangle or any shape. How can I detect shape and color together. Bro please help me

Abdusoli ( 2019-04-18 01:58:32 -0600 )edit

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I am trying to detect red color using inRange keyword. But I cannot check it inside If statement. If red color comes then print It is red color

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I am trying to detect red color using inRange keyword. But I cannot check it inside If statement. If red color comes then print It is red color