Difference between revisions of "Working with raw image data"
From ElphelWiki
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'''echo 0 > /sys/devices/soc0/elphel393-videomem\@0/membridge_start2''' | '''echo 0 > /sys/devices/soc0/elphel393-videomem\@0/membridge_start2''' | ||
'''cat /dev/image_raw2 > /tmp/test.raw'''</font> | '''cat /dev/image_raw2 > /tmp/test.raw'''</font> | ||
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==<font color='darkblue'>Displaying</font>== | ==<font color='darkblue'>Displaying</font>== | ||
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<font size='2em'>bayer2rgb -w 2608 -v 1940 -b 8 -f GRBG -m AHD -t -i test.raw -o test.tiff</font> | <font size='2em'>bayer2rgb -w 2608 -v 1940 -b 8 -f GRBG -m AHD -t -i test.raw -o test.tiff</font> | ||
The result is a colored tiff image. Pixel values are linear. | The result is a colored tiff image. Pixel values are linear. | ||
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==<font color='darkblue'>Processing</font>== | ==<font color='darkblue'>Processing</font>== |
Revision as of 12:25, 12 January 2018
Downloading
- Available options (channels can be 0..3):
# set receiving buffer size in 4kB pages (thus 4096 equals to 16MB) echo {size} > /sys/devices/soc0/elphel393-mem\@0/buffer_pages_raw_chn2 # start from the N-th frame position in buffer. Currently, 0 or 1 echo 1 > /sys/devices/soc0/elphel393-videomem\@0/video_frame_number # initiate transfer, wait for X-th frame (X - absolute frame number), 0 = no waiting echo X > /sys/devices/soc0/elphel393-videomem\@0/membridge_start2 # copy to file cat /dev/image_raw2 > /tmp/test.raw # see in hex hexdump /tmp/test.raw # copy to PC scp /tmp/test.raw user@address:/path/
- Minimal:
echo 4096 > /sys/devices/soc0/elphel393-mem\@0/buffer_pages_raw_chn2 echo 0 > /sys/devices/soc0/elphel393-videomem\@0/membridge_start2 cat /dev/image_raw2 > /tmp/test.raw
Displaying
ImageMagick
- Camera settings: 2592x1936 JPEG, actual pixels available: 2608x1940
convert -size 2608x1940 -depth 8 -endian MSB -normalize gray:test.raw -compress lzw result.tiff
- Camera settings: 2592x1936 JP4, actual pixels available: 2592x1936
convert -size 2592x1936 -depth 8 -endian MSB -normalize gray:test.raw -compress lzw result.tiff
The result is a grayscale tiff
bayer2rgb program
- Available here.
- Camera settings: 2592x1936 JPEG, actual pixels available: 2608x1940
bayer2rgb -w 2608 -v 1940 -b 8 -f GRBG -m AHD -t -i test.raw -o test.tiff
The result is a colored tiff image. Pixel values are linear.
Processing
Python
- Camera settings: 2592x1936 JPEG, actual pixels available - 2608x1940:
#!/usr/bin/python3 from PIL import Image rawData = open("test.raw", 'rb').read() imgSize = (2608,1940)# the image size img = Image.frombytes('L', imgSize, rawData) img.save("result.jpeg")# can give any format you like .png