why both

[coldstart01]

Hi, love cvui.

Why does it seems that I need both cvui image and imshow to display an image. I've tried them individually but then they don't show anything at all.

cvui::image(frame, 25, 25, im_with_keypoints); ... cvui::imshow(WINDOW1_NAME, frame);

Thank you.

[WojOstr]

Hi, im not the specialist out there, but as far as I know you can put multiple images on frame, but it won't show up until you call imshow(window, frame), because you have to pass the frame to window to show it

[Dovyski]

The explanation provided by @WojOstr nailed it. For further understanding, @coldstart01 , the function cvui::image() is one (of the many) drawing primitives cvui has. They all work putting pixels in a frame (a cv::Mat). When you are done drawing things (images, checkboxes, etc), you need to call OpenCV's function to show the frame in a window.

cv::imshow() is that function. Since cvui does a lot of heavy lifting under the hook, e.g. detect shortcut keys, it has its own version of imshow named cvui::imshow. In practice they do the same thing (show a frame in a window), but cvui's one some things extra.

Is it clear now?

[coldstart01]

Ive built a few GUIs with cvui and its lightweight construction has allowed me to control ooencv programs in real time with transparent overlays. Its easy, made my programs more responsive. For example i made an overlay that implemented in real time control over many if the params. Thanks for helping further understanding.

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On Mon, Apr 5, 2021, at 4:53 PM, Fernando Bevilacqua wrote:

The explanation provided by @WojOstr https://github.com/WojOstr nailed it. For further understanding, @coldstart01 https://github.com/coldstart01 , the function cvui::image() is one (of the many) drawing primitives cvui has. They all work putting pixels in a frame (a cv::Mat). When you are done drawing things (images, checkboxes, etc), you need to call OpenCV's function to show the frame in a window.

cv::imshow() is that function. Since cvui does a lot of heavy lifting under the hook, e.g. detect shortcut keys, it has its own version of imshow named cvui::imshow. In practice they do the same thing (show a frame in a window), but cvui's one some things extra.

Is it clear now?

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[Dovyski]

I am very glad to hear that, @coldstart01, thank you!