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问题描述
我有一个有4个频道并且处于 4 * UINT8 格式的图片。
I have an image which has 4 channels and is in 4 * UINT8 format.
将其转换为3通道浮动和我使用这个代码：
I am trying to convert it to 3 channel float and I am using this code:
images.convertTo(images,CV_32FC3,1/255.0);
但转换后，Image是一个浮点数，但仍有4个通道。
But after conversion, Image is a float but still has 4 channels. How can I get ride of 4th (alpha) channel in OpenCV?
推荐答案
如@AldurDisciple说，用于更改 Mat 的数据类型，而不是更改频道数量。
As @AldurDisciple said, Mat::convertTo() is intended to be used for changing the data type of a Mat, not for changing the number of channels.
要解决问题，您应该将其分为两个步骤：
To work out, you should split it into two steps:
cvtColor(image, image, CV_BGRA2BGR); // 1. change the number of channels
image.convertTo(image, CV_32FC3, 1/255.0); // 2. change type to float and scale
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