A command line utility (and library) which will determine whether a 16mm film frame has been digitized at an angle by detecting the edges of the film perforations.
usage: detect_angled_frames.py [-h] [--threads THREADS] [--min MIN]
[--outdir OUTDIR]
[--color_tolerance COLOR_TOLERANCE]
[--perf_line_pct PERF_LINE_PCT]
images [images ...]
positional arguments:
images images to process
optional arguments:
-h, --help show this help message and exit
--threads THREADS Number of threads
--min MIN minimum angle to report
--outdir OUTDIR Output directory for diagnostic images
--color_tolerance COLOR_TOLERANCE
Color channel tolerance for baselight
--perf_line_pct PERF_LINE_PCT
Percentage from top and bottom for perf location
The tool can generate images with alignment marks on them, as well as angle and filename information:
