Opencv Mat To Qimage

I m using windows 10 and linux 18 04 with qt 5 12 and opencv 4 0 1. I have a problem when loading a qimage and then converting it to an opencv mat. 2017 12 19 07 02 00 0500 seen.

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Opencv mat to qimage. I ve tried a bunch of things and searched for hours. Jksh said in how to convert qimage to opencv mat c. Qimage mat to qimage ref cv mat mat qimage format format return qimage mat data mat cols mat rows format. Here is the code snippet in question void appname slotframeready cv mat image qint64 capturetime qint64.

Mehfoos yacoob is right that is the best way to convert a cv mat to a qpixmap. Just using cv 8uc1 type mat would be the easier way since malikov wants to get a cv mat from existing qimage. Does anyone know how to do. The results may work or may not work because the bytes of each row we call it stride may vary vary or not is depends on the image to prevent this kind of tragedy we need to tell the qimage how many bytes per row by mat step.

The first thing to note is that the cv mat to qpixmap conversion cvmattoqpixmap at the bottom of this section simply relies on cvmattoqimage and uses qt s qpixmap fromimage to return a qpixmap so that s pretty straightforward. This may be outside the scope of this forum if so i am sorry but i have not been able to find a solution elsewhere. Thanks in advance for any answers or comments. Trying to convert local webcam stream from cv mat to qimage but the output is weird.

To convert from cv mat to qimage you could try to use the qimage uchar data int width int height format format constructor as follows mat is a cv mat. I m working on a project with qt opencv and i need to convert an image cv mat to qimage and or viceversa. It is important to keep in mind the type of the cv mat in order to use the correct qimage format. Try converting your qimage to a 16 bit format first.

It is more efficient than manually converting the pixels to the qimage but you have to keep the original cv mat image in memory. First you need to convert the cv mat to a qimage and then using the fromimage function assign its result to a qpixmap. The second thing to notice is the switch statement in the cv mat to qimage conversion cvmattoqimage because both opencv and qt provide multiple data. Qimage img uchar mat data mat cols mat rows qimage format rgb32.