更改帧类型而不丢失数据

Question

I'm using Opencv and I have two frame : cv::frame1 and cv::frame2, when I check their type I get :

 frame1.type()  is 16 
frame2.type() is 21

my Question is how can I change the type of frame2 to 16 without losing its data ?? I tried frame2.convertTo() it didn't work .

any Idea ?

Answer 1

From what I understand you want to convert an image of type CV_32FC3 (3 channel float) to CV_8UC3 (3 channel unsigned char). This cannot be done without losing some information: In the first case you have 4 bytes per pixel and in the second 1 byte per pixel, so as you understand there is going to be some loss.

This code is used to convert to a different type and works fine for me:

cv::Mat A = cv::Mat(480, 640, CV_32FC3, CV_RGB(1.0,1.0,1.0));
cv::Mat B;
A.convertTo(B, CV_8UC3);