OpenCV的Android的绿色检测 [英] OpenCV Android Green Color Detection
问题描述
目前我在做一个应用程序，其中用户会发现绿色。我用这张照片来进行测试：
currently I'm making an app where user will detect green colors. I use this photo for testing:
我的问题是，我无法检测到任何绿色像素。之前，我曾与蓝色，一切运行良好。现在，我无法检测到任何东西，虽然我试图 RGB 的不同组合。我想知道它是否是问题，绿色或我的检测范围，所以我用涂料制成的图像（0，255，0）和它的工作。为什么看不到这个圈子呢？我用这个code检测：
My problem is that I can not detect any green pixel. Before I worked with blue color and everything worked fine. Now I can't detect anything though I tried different combinations of RGB. I wanted to know whether it's problem with green or my detection range, so I made an image in paint using (0, 255, 0) and it worked. Why it can't see this circle then? I use this code for detection:
Core.inRange(hsv_image, new Scalar([I change this value]), new Scalar(60, 255, 255), ultimate_blue);
这可能是我设置错了范围，但我用Photoshop来获得绿色像素的一种颜色并转换它的 RGB 价值为 HSV 。然而，这是行不通的。它并没有发现我已经采样偶数像素。怎么了？先谢谢了。
It could have been that I set wrong Range, but I use Photoshop to get color of one of green pixels and convert RGB value of it into HSV. Yet it doesn't work. It don't detect even pixel that I've sampled. What's wrong? Thanks in advance.
使用三木的回答是：
推荐答案
绿颜色是HSV空间的H = 120，它是在区间[0，360]。
Green color is HSV space has H = 120 and it's in range [0, 360].
的OpenCV半部为H值，以适应范围[0,255]，所以H值为代替范围[0，360]为，是在范围[0，180]。 S和V仍然在范围[0,255]。
OpenCV halves the H values to fit the range [0,255], so H value instead of being in range [0, 360], is in range [0, 180]. S and V are still in range [0, 255].
作为结果中，H为绿色的值是60 = 120/2
As a consequence, the value of H for green is 60 = 120 / 2.
您上限和下限应该是：
// sensitivity is a int, typically set to 15 - 20
[60 - sensitivity, 100, 100]
[60 + sensitivity, 255, 255]
更新
由于你的形象是相当黑暗的，你需要使用一个下界为V.有了这些值：
Since your image is quite dark, you need to use a lower bound for V. With these values:
sensitivity = 15;
[60 - sensitivity, 100, 50] // lower bound
[60 + sensitivity, 255, 255] // upper bound
产生的面具是这样的：
the resulting mask would be like:
您可以参考这个答案了解详情。
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