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Hi, i'm developing a mobile app to capture images of seedling and calculate the plant growth (after 3 weeks) by calculating the differences of white pixels (after changing it to threshold) for each images. I already got how to change it to threshold but i don't know how to count black and white pixels numbers of the image. I'm using OpenCV for Unity plugin. Can anybody help me?

Hi, i'm developing a mobile app to capture images of seedling and calculate the plant growth (after 3 weeks) by calculating the differences of white pixels (after changing it to threshold) for each images. I already got how to change it to threshold but i don't know how to count black and white pixels numbers of the image. I'm using OpenCV for Unity plugin. Can anybody help me?