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Trying to capture QImage of video frame

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #21

    Please be more precise. "Not working" doesn't say much. What are you getting ? A blank image ? A black image ? Funny colours ?

    Interested in AI ? www.idiap.ch
    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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    • SGaistS SGaist

      Please be more precise. "Not working" doesn't say much. What are you getting ? A blank image ? A black image ? Funny colours ?

      A Offline
      A Offline
      Anjani
      wrote on last edited by
      #22

      @SGaist
      ooh sorry for that. it still gives me .jpg image, where I want RGB data of image/frame.yet I am getting only the first frame all though I try to capture frame at any time.

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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #23

        Aren't you getting a .png file ?

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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        • A Offline
          A Offline
          Anjani
          wrote on last edited by
          #24

          yes i am getting .png but i want data in rgb format. because raw data format is only allowed on my frame buffer to display.

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          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #25

            You do realise that if you load your image again in a QImage, you'll get a RGB image ?

            If you really want to save an RGB image then go for bitmap but beware, it's uncompressed.

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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            • A Offline
              A Offline
              Anjani
              wrote on last edited by
              #26

              oh yes thank you. this will solve my problem partially. but what about new frame capture.? can you please help me out where I am lacking or what i am missing? why I am getting the same frame every time?If I'll get updated frame my task will be almost on final stage.please solve this.and again thank you.

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              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #27

                You always take the same image from the list, check that your counter increments properly and that you indeed update the list.

                On a side note, you should pass const reference to QImage parameters. That will save useless copies.

                Interested in AI ? www.idiap.ch
                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                • A Offline
                  A Offline
                  Anjani
                  wrote on last edited by
                  #28

                  Thank you for reply and sorry for late response. Yes probably i am incrementing the counter properly. and sir I couldn't understand what you said about const reference to QImage parameter?

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                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #29

                    Use: const QImage &image as parameter

                    Interested in AI ? www.idiap.ch
                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                    • A Offline
                      A Offline
                      Anjani
                      wrote on last edited by
                      #30

                      K let me try it

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