V3.3 - imshow no response [closed]

asked 2017-09-12 13:43:43 -0600

busybyte
6 ●3

updated 2017-09-13 02:26:50 -0600

Hello,

i just installed opencv3.3 under vs2017, windows 8.1, and tried imshow, which was runnin perfect under 3.2.

the result is a grey picture and the window state is: no response. i tried it with 2 different cams and with precompiled 3.3 as well as self compiled 3.3, same result.

image description

VideoCapture cap; if (!cap.open(1)) return 0; for (;;) { Mat frame;

        cap >> frame;
        //cap.read(frame);
        //cap.retrieve(frame, 1);
    if (frame.empty()) break; // end of video stream

        //frame.AUTO_STEP;
        cv::imshow("RoboCam", frame);
    }

the debugger steps permanent through the for loop while showing the window

do you have any ideas or same results with 3.3 ?

many thanks for your help !

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Closed for the following reason the question is answered, right answer was accepted by busybyte
close date 2017-09-12 17:32:05.554505

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Many thanks magic, you're also right, today i tested the restored backup without the waitkey command and i got the gray window again !

busybyte ( 2017-09-13 02:27:02 -0600 )edit

Now i found the second/main-reason, cause i got the same problem with a facedetect-sample.

The reason is in different settings in debug and release-setups

Changing the following settings in debug-options and it will run great (i hope my translation is correct)

Option: C/C++ -> Preprocessor-> Processordefinitions: _DEBUG;%(PreprocessorDefinitions) ----> _NODEBUG;%(PreprocessorDefinitions)

Option: C/C++ ->Codegenerating->Runtimelibrary: Multithreaded-Debug-DLL (/MDd) -----> Multithreaded-DLL (/MD)

This works for me under x64-platform with vs2017

busybyte ( 2017-09-13 13:16:33 -0600 )edit

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p.s, this kind of behaviour did not change among versions, imho, you only lost a line of code in the transition

berak ( 2017-09-12 14:07:51 -0600 )edit

thanks magic,

i tried the cv::waitKey after imshow but still the same result. (i7,geforce gtx,8gb-ram)

i still wonder why 3.2 is working and also precompiled 3.3 not

the funny thing is, if i disconnect the usb-cam(verry good logitec) the last frame is shown

if i copy opencv_world320(d).lib/.dll to 330directories and change the linker to 320 i get a compiler error unresolved token in class cv::videocapture

busybyte ( 2017-09-12 14:28:44 -0600 )edit

the problem maybe has been a bad configuration in my project. i restored a backup made with 3.2, configured it to 3.3 and copied the opencv_world330(d).dll's to my project outputdirectories. now it's working thank you magic and berak

busybyte ( 2017-09-12 17:35:37 -0600 )edit

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V3.3 - imshow no response [closed]

Closed for the following reason the question is answered, right answer was accepted by busybyte
close date 2017-09-12 17:32:05.554505

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V3.3 - imshow no response [closed] edit

Closed for the following reason the question is answered, right answer was accepted by busybyte close date 2017-09-12 17:32:05.554505

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V3.3 - imshow no response [closed]

Closed for the following reason the question is answered, right answer was accepted by busybyte
close date 2017-09-12 17:32:05.554505