C++ OpenCV：阈值和反转图像
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OpenCV: Threshold and Invert an image
提问by Sr.Richie
I'm trying to threshold and invert an image with Cinder OpenCV block. In openFrameworks I would use something like that:
我正在尝试使用 Cinder OpenCV 块阈值和反转图像。在 openFrameworks 中，我会使用类似的东西：
someImage.threshold(230, true);
...where true is the parameter to specify to threshold and invert.
...其中 true 是指定阈值和反转的参数。
In Cinder I'm trying the following:
在 Cinder 中，我正在尝试以下操作：
cv::threshold (input, threshNear, 230, 255, CV_THRESH_BINARY_INV);
... that doesn't work, or
...这不起作用，或者
cv::threshold (input, threshNear, 100, 255, CV_8U);
cv::invert ( threshNear, threshNearInverted);
...that produces and error and let the program stuck.
...产生错误并让程序卡住。
Any suggestion?
有什么建议吗？
回答by Sr.Richie
Ok, after more testing I've realized that actually the way to go is
好的，经过更多测试后，我意识到实际上要走的路是
cv::threshold (input, threshNear, 70, 255, CV_THRESH_BINARY_INV);
the problem with the code I posted in my question looks like to be related with the threshold value I was trying to use (230 on 255). If I use a lower value (like for example 70 on 255) the color inversion actually works.
我在问题中发布的代码问题似乎与我尝试使用的阈值（255 上的 230）有关。如果我使用较低的值（例如 255 上的 70），颜色反转实际上有效。
