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Clarify dark_threshold semantics for IR users in config.ini #1108

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Clarify dark_threshold semantics for IR users in config.ini #1108

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10 changes: 6 additions & 4 deletions howdy/src/config.ini
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Original file line number Diff line number Diff line change
Expand Up @@ -62,10 +62,12 @@ max_height = 320
frame_width = -1
frame_height = -1

# Because of flashing IR emitters, some frames can be completely unlit
# Skip the frame if the lowest 1/8 of the histogram is above this percentage
# of the total
# The lower this setting is, the more dark frames are ignored
# Reject a frame when the lowest 1/8 of the histogram (pixel brightness
# 0-31 out of 255) exceeds this percentage of total pixels.
# Higher values tolerate darker rooms; lower values reject more frames as dark.
# The default of 60 is calibrated for visible-light webcams. Pure-IR cameras
# in dim rooms commonly read 80-95% near-black pixels (face is lit by the
# IR emitter, background stays unlit) and need this raised to 80-95.
dark_threshold = 60

# The recorder to use. Can be either opencv (default), ffmpeg or pyv4l2.
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