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    IR tracking system

    How To... ?
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    • K
      kikko last edited by

      Hi everybody!

      In the last few days we are trying to do some experiment using Isadora Eyes motion tracking system. 
      The problem found is the follow: on the stage we have some white doors on wheel and we project on those a video. No light coming from the front of the stage, just blu led bars backlight on the backdrop. Eyes can recognize the white doors (we have try also the Chorma trick), but, when we move it, the video start to follow the doors with quite big delay and shifting. 
      On the forum we read something about IR tracking system, but we don't know if is the best solution to the problem and how to manage this tecnology. Which kind of IR camera we have to use? More than one? How far from the stage we have to position it? Which kind of IR sensor and how many we have to place on the doors? Or, conversely, we have to lighting the stage with lot of IR light and work in negative image?
      Somebody could help us?
      Thank you!
      Francesco

      Isadora 3.0.8/Win 10 Pro 64 bit/Intel Core i7-8750H/32GB DDR4 2400hz/Samsung SSD Evo 860 + Samsung SSD Evo 970/Nvidia GTX 1060

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      • Michel
        Michel Izzy Guru last edited by

        @kikko

        What camera are you using at the moment and how are you connecting it to your computer?

        Best
        Michel

        Michel Weber | www.filmprojekt.ch | rMBP (2019) i9, 16gig, AMD 5500M 8 GB, OS X 10.15 | located in Winterthur Switzerland.

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        • Fred
          Fred last edited by

          To do good IR tracking you need first clean the area of IR light, and your image. You need to block all incandescent lamps from outputting IR light. Roscolux 1995 will help with this.

          Next is to make sure your camera has an IR bandpass filter installed. you also have to match this with the sensitivity of the camera (different sensors get different IR frequency better or worse) midwest optic has a full range of IR pass filters and adaptors to make it fit your camera. 
          Also you camera has to be either ready for IR or have the IR blocking filter removed manually, as well as having total manual control over all settings.
          Next you need a good IR light source- depending on what your setup this can change a lot, there are panels and floods etc.
          Now with a clean setup you can begin. It is a good idea to look at how you can get the most contrast between what you want to track and the surrounding. This is often difficult as high levels of IR illumination also show up as white. One method that works well is to light the moving subject from behind with an array of IR LEDS. This gives you a blown out image but with a lot of contrast, the moving subject blocks the light and gives enough contrast for good tracking.
          Beware some textiles reflect a lot of IR light, it is worth checking all the costumes to make sure they will work in the tracking.
          Fred 

          http://www.fredrodrigues.net/
          https://github.com/fred-dev
          OSX 10.15.15 MBP 2019 16" 2.3 GHz 8-Core i9, Radeon Pro 5500M 8 GB, 32g RAM
          Windows 10 7700K, GTX 1080ti, 32g RAM, 2tb raided SSD
          Windows 10 Threadripper 3960x 64g ram, 1tb NVME, rtx 2080ti + rtx2070 super

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          • K
            kikko last edited by

            Dear Michel,

            For now we using a standard Canon HV20 camera and we connecting this with a firewire cable.
            Thanks
            Francesco

            Isadora 3.0.8/Win 10 Pro 64 bit/Intel Core i7-8750H/32GB DDR4 2400hz/Samsung SSD Evo 860 + Samsung SSD Evo 970/Nvidia GTX 1060

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            • Fred
              Fred last edited by

              The HV20 has an IR blocker on the sensor and cannot be used for IR tracking.

              http://www.fredrodrigues.net/
              https://github.com/fred-dev
              OSX 10.15.15 MBP 2019 16" 2.3 GHz 8-Core i9, Radeon Pro 5500M 8 GB, 32g RAM
              Windows 10 7700K, GTX 1080ti, 32g RAM, 2tb raided SSD
              Windows 10 Threadripper 3960x 64g ram, 1tb NVME, rtx 2080ti + rtx2070 super

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              • Michel
                Michel Izzy Guru last edited by

                Firewire is not very good when it comes to low latency.

                Best
                Michel

                Michel Weber | www.filmprojekt.ch | rMBP (2019) i9, 16gig, AMD 5500M 8 GB, OS X 10.15 | located in Winterthur Switzerland.

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                • Skulpture
                  Skulpture Izzy Guru last edited by

                  Analogue CCTV is always a good method. The problem is digitising the signal.

                  Graham Thorne | www.grahamthorne.co.uk
                  RIG 1: Windows 11, AMD 7 Ryzen, RTX3070, 16gig RAM. 2 x M.2 SSD. HD. Lenovo Legion 5 gaming laptop.
                  RIG 2: Windows 11, Intel i19 12th Gen. RTX3070ti, 16gig RAM (ddr5), 1x M.2 SSD. UHD DELL G15 Gaming laptop.
                  RIG 3: Apple rMBP i7, 8gig RAM 256 SSD, HD, OS X 10.12.12

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                  • Skulpture
                    Skulpture Izzy Guru last edited by

                    Or the good old PS3 hack...

                    [https://www.google.co.uk/webhp?sourceid=chrome-instant&ion=1&espv=2&es_th=1&ie=UTF-8#q=ps3%20eye%20ir%20filter%20removal](https://www.google.co.uk/webhp?sourceid=chrome-instant&ion=1&espv=2&es_th=1&ie=UTF-8#q=ps3%20eye%20ir%20filter%20removal)

                    Graham Thorne | www.grahamthorne.co.uk
                    RIG 1: Windows 11, AMD 7 Ryzen, RTX3070, 16gig RAM. 2 x M.2 SSD. HD. Lenovo Legion 5 gaming laptop.
                    RIG 2: Windows 11, Intel i19 12th Gen. RTX3070ti, 16gig RAM (ddr5), 1x M.2 SSD. UHD DELL G15 Gaming laptop.
                    RIG 3: Apple rMBP i7, 8gig RAM 256 SSD, HD, OS X 10.12.12

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