将 16 位深度 CvMat* 转换为 8 位深度
我正在使用 Kinect 和 OpenCV。我已经在这个论坛中搜索过，但没有找到与我的问题类似的内容。 我保留来自 Kinect（16 位）的原始深度数据，将其存储在 CvMat* 中，然后将其传递给 cvGetImage 以从中创建 IplImage*：
CvMat* depthMetersMat = cvCreateMat( 480, 640, CV_16UC1 );
[...]
cvGetImage(depthMetersMat,temp);
但现在我需要处理该图像才能执行 cvThreshdold并找到轮廓。这两个函数需要输入 8 位深度的图像。如何将 CvMat* heightMetersMat 转换为 8 位深度-CvMat* ？
I'm working with Kinect and OpenCV. I already search in this forum but I didn't find anything like my problem.
I keep the raw depth data from Kinect (16 bit), I store it in a CvMat* and then I pass it to the cvGetImage to create an IplImage* from it:
CvMat* depthMetersMat = cvCreateMat( 480, 640, CV_16UC1 );
[...]
cvGetImage(depthMetersMat,temp);
But now I need to work on this image in order to do cvThreshdold and find contours. These 2 functions need an 8-bit-depth-image in input. How can I convert the CvMat* depthMetersMat in an 8-bit-depth-CvMat* ?
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@SSteve 给出的答案几乎对我有用，但是对
convertTo的调用似乎只是砍掉了高位字节，而不是实际将值缩放到 8 位范围。由于@Sirnino 没有指定想要哪种行为，我想我应该发布将执行（线性）缩放的代码，以防其他人想要这样做。SSteve 的原始代码：
要缩放值，您只需添加比例因子（1/256，或 0.00390625，对于 16 位到 8 位缩放）作为第三个参数（alpha）对
convertTo的调用您还可以添加第四个参数 (delta)，该参数将在乘以 alpha 后添加到每个值。有关详细信息，请参阅文档。
The answer that @SSteve gave almost did the trick for me, but the call to
convertToseemed to just chop off the high order byte instead of actually scaling the values to an 8-bit range. Since @Sirnino didn't specify which behavior was wanted, I thought I'd post the code that will do the (linear) scaling, in case anyone else is wanting to do that.SSteve's original code:
To scale the values, you just need to add the scale factor (1/256, or 0.00390625, for 16-bit to 8-bit scaling) as the third parameter (alpha) to the call to
convertToYou can also add a fourth parameter (delta) that will be added to each value after it is multiplied by alpha. See the docs for more info.
这应该有效：
但是根据OpenCV文档，CvMat是过时的。你应该使用 Mat 来代替。
This should work:
But according to the OpenCV docs, CvMat is obsolete. You should use Mat instead.