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发表于 2015-8-11 13:03:31
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I installed a MinimOSD (with rush-osd-development MWii OSD firmware) on a Quadcopter with a Baseflight (Naze32 compatible) Flight Controller. The build is summarized here: http://www.rc-cam.co...acer-build-log/. I discovered that the MinimOSD would not work with several of the FPV cameras I tried. The OSD would work fine without the camera (realtime OSD data was correctly presented on black background). But when it was connected to the camera the OSD data would not appear (or would appear but not update reliably). That is to say, the video camera's image was fine, but the OSD was non-functional.
After some research it became clear that this is a popular complaint among minimOSD users. The most common theory is that high resolution cameras are to blame and that using a lower resolution camera solves it. Although this advice seems to cure the problem in a lot of installations, the reasoning is incorrect. The actual problem is that some Chinese made cameras have incorrect video sync levels. I found that the sync amplitude on affected cameras was marginal and the OSD chip could not detect the presence of vertical sync (but fortunately it could still detect horizontal sync).
难道是这问题？
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