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QCamera focus over some area, suggestions.

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  • upallayU Offline
    upallayU Offline
    upallay
    wrote on last edited by
    #1

    HI, I'm developing a program in c++ for security camera for my neighbourhood that uses a webcam (I'm using my webcam to test).
    I'm using a QCameraFocus to zoom in and zoom out using the zoomTo() function, it works, but it just focuses in the center, and I would like to zoom over some area, like the corner in the view. I tried using setCustomFocusPoint but it didn't work. Also I would like to rotate some degrees.
    I would like to receive some suggestions to get zoom over any area and rotate some degrees.

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi,

      Does your camera provider offer any API for that ?

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

      upallayU 1 Reply Last reply
      0
      • SGaistS SGaist

        Hi,

        Does your camera provider offer any API for that ?

        upallayU Offline
        upallayU Offline
        upallay
        wrote on last edited by
        #3

        @SGaist , I'm currently testing with my laptop webcam (according lsusb command Chicony Electronics is the information about my webcam), but for my project deploy I'm going to use a Logitech webcam c270. I've been looking for information about some API of my webcam, but I did not found something related with Qt.

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #4

          Qt cannot cover every possible APIs. By the way what OS are you running ? They do not all offer all the range of controls.

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

          upallayU 1 Reply Last reply
          0
          • SGaistS SGaist

            Qt cannot cover every possible APIs. By the way what OS are you running ? They do not all offer all the range of controls.

            upallayU Offline
            upallayU Offline
            upallay
            wrote on last edited by upallay
            #5

            @SGaist , I'm running in ubuntu 18, but I tried in windows as well, and the results is the same. I'm thinking to convert the data from the camera to image, cut, rotate and set them over a QLabel, but I don't know if this method is going to be the best way, because I would like to capture 15 fps at less.

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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #6

              Are you planning to do any image processing on these image beside zooming ?

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

              upallayU 1 Reply Last reply
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              • SGaistS SGaist

                Are you planning to do any image processing on these image beside zooming ?

                upallayU Offline
                upallayU Offline
                upallay
                wrote on last edited by
                #7

                @SGaist , I just need zooming and rotate some area of the camera capture, I thought that I could achieve using only QCameraFocus or relative libraries but I guess I have to use another method.

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                • B Offline
                  B Offline
                  Bonnie
                  wrote on last edited by Bonnie
                  #8

                  What does isFocusPointModeSupported(QCameraFocus::FocusPointCustom) return?
                  And if I need to rotate a video in Qt, I would start from QGraphicsVideoItem in a QGraphicsView. Don't know whether that would work though...
                  Do you want to rotate a single still image file or the whole video widget?

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