forked from Qortal/Brooklyn
40 lines
1004 B
Markdown
40 lines
1004 B
Markdown
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Post-processing example programs to play with the imv buffer:
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=============================================================
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Compile:
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--------
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gcc imv2pgm.c -o imv2pgm -lm
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gcc imv2txt.c -o imv2txt
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Record and split buffer:
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raspivid -x test.imv -o test.h264
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We need to split the buffer first using split:
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split -a 4 -d -b $(((120+1)\*68\*4)) test.imv frame-
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Play:
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-----
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Now we can transform the velocity magnitues to a pgm image
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./imv2pgm frame-0001 120 68 frame-0001.pgm
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Or loop over all frames and create a movie
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for i in frame-????; do ./imv2pgm $i 120 68 $i.pgm;convert $i.pgm $i.png; rm $i.pgm; done
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avconv -i frame-%04d.png motion.avi
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And we can create a text file for easy plotting
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./imv2txt frame-0001 120 68 frame-0001.dat
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This textfile has in each line the center position x y of the macro block and
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the velocities u and v and the sum of differences sad.
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These can be plot with xmgrace
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xmgrace -autoscale none -settype xyvmap frame-0001.dat -param plot.par
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