Hi,
I have a problem to save an image with pixel value between 0 and 1. When i save the pixel value in a txt file to check, i have the right value (0.023, 0.15 .....). But when i save this image to an image format, i can't get the see those values. I use imageJ to visualize the image and i test jpeg, png tif and bmp image formats.
What did i have miss?
imwrite() can only save float images in ".exr" or ".hdr" format, and that only, if you built in suppport for that (WITH_OPENEXR).
if you want to save it as png or jpg, you will need to convert it to uchar first:
Mat floatImg = ...
Mat ucharImg;
floatImg.convertTo(ucharImg, CV_8U, 255.0);
imwrite("my.png", ucharImg);
alternatively, you can use the FileStorage, to save your img to yml (text):
FileStorage fs("my.yml", 1);
fs << "some_name" << image;
fs.release();
Well that work but how can i visualize the yml format. i mean like a normal image?
Thank you for the help, but i want to visualize the floating image. I will keep serach for a solution. thank you again.
It is still the same image, basically converting it to uchar means you multiply it by a specific factor and visualise that. But the relative differences between pixels will still remain the same, only the base on which they are calculated is changed.
Asked: 2016-09-21 02:05:34 -0600
Seen: 2,942 times
Last updated: Sep 21 '16
