问题描述
我是图像处理和Opencv的新手.我需要对灰度图像进行阈值处理.该图像包含0到1350之间的所有值，我想保留所有大于100的值.我在opencv中发现了此功能:
I am new in image processing and opencv. I need to threshold my gray scale image. The image contains all value between 0 to 1350 and I want to keep all values which are more than 100. I found this function in opencv:
cv::threshold( Src1, Last, 100, max_BINARY_value,3);
我不知道应该在max_BINARY_value部分中写什么，我也不知道最后一项是否被正确选择.
I do not know what should I write in the max_BINARY_value part and aslo I do not know if the last item is selected correctly or not.
谢谢.
推荐答案
C++: double threshold(InputArray src, OutputArray dst, double thresh, double maxval, int type)
您正确选择了Src1，Last和阈值100.maxval仅在使用THRESH_BINARY或THRESH_BINARY_INV作为类型时使用.
You selected your Src1, Last and your Threshold 100correctly.maxval is only used if you use THRESH_BINARY or THRESH_BINARY_INV as type.
您要使用的是cv::THRESH_TOZERO作为类型.这会将所有值保持在阈值之上，并将所有其他值设置为零.
What you want to use is cv::THRESH_TOZERO as type. Ths keeps all values above your Threshold and sets all other Values to zero.
请记住，始终最好使用此参数的名称"而不是它们的整数表示形式.如果您在几周内通读代码，cv::THRESH_TOZERO会说出您需要的所有内容，而3只是一个数字.
Please keep in mind that it is alway better to use the "Names" of this Parameters instead of their integer representation. If you read through your code in a few weeks cv::THRESH_TOZERO says everything you need, where 3 is only a number.
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