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waveform80 / picamera

A pure Python interface to the Raspberry Pi camera module
https://picamera.readthedocs.io/
BSD 3-Clause "New" or "Revised" License
1.57k stars 357 forks source link

Display numpy array using picamera #690

Open watchever opened 3 years ago

watchever commented 3 years ago

I really like the display get through start_preview, because it is simple and low level (so probably fast). Is it also possible to display a fixe image like numpy or any other output through picamera api ? At present I use matplotlib but would really prefer to use picamera.

Thanks for your help

6by9 commented 3 years ago

3.14. Overlaying images on the preview https://picamera.readthedocs.io/en/release-1.13/recipes1.html#overlaying-images-on-the-preview

watchever commented 3 years ago

Thanks a lot for your reply, exactly what I need.

watchever commented 3 years ago

Hu... Sorry another question I use add_overlay to display a new fixed image each n seconds. But after few iterations I got an Out of Memory error. In fact only the last overlay interest me. Is there a smart way to free memory ? Following is the last exception line.

File "/usr/lib/python3/dist-packages/picamera/exc.py", line 184, in mmal_check raise PiCameraMMALError(status, prefix) picamera.exc.PiCameraMMALError: Unable to enable port vc.ril.camera:out:2: Out of memory