OpenCV CV_WINDOW_KEEPRATIO doesn't work

asked 2015-05-28 08:07:11 -0600

Giraphant
11 ●1

Hi everyone,

When I try to display image inside window it won't keep ratio when resized manually

namedWindow(WINDOW_NAME, CV_WINDOW_NORMAL | CV_WINDOW_KEEPRATIO | CV_GUI_EXPANDED);
imshow(WINDOW_NAME, image);

effect will be something like this

image description

This problem was already described here by some other person http://code.opencv.org/issues/3800, unfortunately some time passed by but the problem still exists. Does anyone knows how it can be fixed?

OpenCV: 3.0 RC1 Qt: 5.4.1 GCC: 4.9.2 OS: Xubuntu 15.04

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This seems to be fixed as of OpenCV 3.1.0 with Qt 5.7.0 on Windows 7. It is still present in OpenCV 2.4.13.

kaveish ( 2016-07-21 08:33:40 -0600 )edit

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answered 2017-04-20 10:15:02 -0600

opencvuser100
1

Had the same effect, OpenCV 2.4.13, Debian Testing, KDE5 Plasma, Qt 5.7.1

For me I found two possible solutions:

when compiling OpenCV, use cmake switch -DWITH_QT=4 (works even on Debian testing system with KDE5, but needs libqt4-dev package)
modify .../opencv-2.4.13/modules/highgui/src/window_QT.cpp : search for resize(newSize); and insert the following line after it: viewport()->resize(newSize);