I tried switching out and frame in and using frame.copyTo(out, mask) instead of Core.bitwise_and(frame, mask, out) It worked!! Here is my final code: // frame is input, out is output Scalar minValues = new Scalar(RFrom, GFrom, BFrom); Scalar maxValues = new Scalar(RTo, GTo, BTo); Mat mask = new Mat(); Core.inRange(frame, minValues, maxValues, mask); frame.copyTo(out, mask); … Read more
Basically you need to change the positions of the various gradients. The first one’s vertical position should start at the “arrow width” var. Both the others vertical positions should be set to 0 instead of 100%. You also need to change the direction of the last two gradients from “to top” to “to bottom” so … Read more
This seems like a regular expression. There * is not a wildcard but a quantifier. It means that the preceding character or group can occur zero or more times. . is a wildcard. It means any character except newline. […] is a character set. It means any character from the set. . is a wildcard … Read more
Edit: Another version suggested by David Young is findIndicesIn xs ys = findIndices (`elem` ys) xs which I prefer to my solution below. If I understand correctly, you have two lists. Call them xs and ys. You want to find the index in xs of each element in ys. You don’t mention what you want … Read more