return error image when marker not detected about visicam HOT 5 CLOSED

why did you close the bugreport?

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we @fau-fablab tried fixing it and found two different ways of failure:

• absolutely no marker found: could be fixed by checking for foundMarkers < 4
• marker found, but a completely wrong position (corner of rectangle?): TODO

as soon as everything works we will send you a pullrequest

note to myself: loading of dummy image: https://github.com/t-oster/VisiCam/blob/master/src/com/t_oster/visicam/CameraController.java#L83

from visicam.

hi, I don't remember closing the pull request. Maybe I miss-clicked. However, should be open again. Nice to know, that anybody is still using VisiCam.

from visicam.

my first try is now online in fau-fablab/VisiCam , branch marker-improvements
TODO: "error image" (all grey?) instead of HTTP error, or try to show the error response contents in VisiCut
TODO: also raise error if marker is too near to the rectangle boundary (how near? enlarge rectangle for search?)

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now shows an error image. detected marker positions can be viewed in the web-interface:
5758228

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