各种门槛 [英] Various thresholds

问题描述

我试图通过一个网络摄像头同时跟踪不同颜色的多个对象。现在我可以用单一阈值的单色做到这一点：

I am trying to track multiple objects with different color at the same time via a single web cam. Now I can do that for single color with single threshold:

IplImage* GetThresholdedImage(IplImage* imgHSV)
{       
    IplImage* imgThresh=cvCreateImage(cvGetSize(imgHSV),IPL_DEPTH_8U, 1);
    cvInRangeS(imgHSV, cvScalar(170,160,60), cvScalar(180,2556,256), imgThresh); 
    return imgThresh;
}

我正在寻找一些提示来做各种门槛。如果它可能，它需要多少个窗口？我是否需要为不同的颜色指定不同的窗口？

I'm looking for some hints to do various threshold. Also if its possible, how many windows does it require? Do i need to assign different windows for different colors?

推荐答案

最简单的方法是为每种颜色创建一个阈值图像你想跟踪。您可以修改函数以将其作为参数，而不是对阈值范围进行硬编码。这允许您为不同的对象重用该函数。

The easiest way to do this is create a thresholded image for each color you wish to track. Instead of hard-coding your threshold ranges, you could modify your function to take them as parameters. This lets you re-use the function for different objects.

修改后的函数可能如下所示：

The modified function might look like this:

IplImage* GetThresholdedImage(IplImage* imgHSV, CvScalar lower, CvScalar upper)
{       
    IplImage* imgThresh=cvCreateImage(cvGetSize(imgHSV),IPL_DEPTH_8U, 1);
    cvInRangeS(imgHSV, lower, upper, imgThresh); 
    return imgThresh;
}

然后使用不同对象的不同阈值调用它：

And then call it using different thresholds for different objects:

IplImage* hsv;    /* Already initialized*/

/* Set thresholds for blue and green objects as an example. */
/*Obviously, set these to be whatever is necessary. */
CvScalar blue_lower = cvScalar(110,60,10);
CvScalar blue_upper = cvScalar(120,256,256);
CvScalar green_lower = cvScalar(40,60,10);
CvScalar green_upper = cvScalar(71,256,256);

/* Get the images thresholded for blue and green. */
IplImage* blue_mask = GetThresholdedImage(hsv, blue_lower, blue_upper);
IplImage* green_mask = GetThresholdedImage(hsv, green_lower, green_upper);

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