Improve image error handling

t-oster / VisiCam

A Java application, that turns a webcam into a VisiCut compatible network camera with marker detection and perspective correction. Uses OpenCV through JavaCV

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Improve image error handling #22

Closed mgmax closed 8 years ago

mgmax commented 8 years ago

yet to be tested:

Show error message if the homography matrix could not be refreshed, even if there is a previous valid homography matrix. (this was probably a regression)
When the markers are not found, output HTTP 503 + Retry-After header, so that this (most probably temporary) error can be handled differently by VisiCut (still to do there)

mgmax commented 8 years ago

It works, but due to the homography matrix caching it takes a long time until VisiCam notices that the markers are gone. @FroChr123 What's the point of the 30s default value for refreshSeconds? For the use-case of opening the lasercutter lid (with camera attached) this is really annoying because the first marker recognition is often made while the lid is still being opened, so it will incorrect for a long time.