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How to correctly read Mat images with special characters in filename

You might have noticed that trying to read images that have special characters (such as Ü, Ö or other non-Ascii characters) with imread function in  OpenCV will lead to crash. I noticed this while trying to open files with special Turkish characters (but I assume it is the same with Spanish, French, German or any other languages.) If you are using Qt, you are lucky because there is a workaround.

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Whirling Compass

Shams

The universe said: I do not have any power over your whirling [,why?]

I answered: It is such a “Point” that made me a compass.

Rumi, Diwan-e Shams-e Tabrizi

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How to read image orientation in Qt (Using stored EXIF)

Updated: QImageReader class in Qt has a new method (introduced in Qt 5.5) named transformation() which you can use for this purpose but this article still applies if you are not using 5.5 or having problems with QImageRaader. Also it is a useful example on how to use GDI in Qt.

You might have also noticed that Qt reads jpg, tif and other types of images that it supports without paying any attention to EXIF information stored in them. EXIF meta data contains highly valuable information about the characteristics of a photograph. Let’s say you want to read an image file into QImage and do some process over it. It is crucial to know what type of orientation the image needs to go through right after reading it.

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How to get position and size of another program’s window in Qt?

You can use Windows API functions to read the position (left and top, or  x and y) of a window that does not belong to your program in Qt. GetWindowRect function allows you to read these values and also right and bottom which can then be used to extract width and height of that window. Note that you need to know the title of your target window or else it is not possible to achieve that. Follow th simple steps below to be able to do this.

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