Difference between revisions of "Working with raw image data"
From ElphelWiki
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| − | ==Downloading== | + | ==<font color='darkblue'>Downloading</font>== |
* Available options (channels can be 0..3): | * Available options (channels can be 0..3): | ||
<font size='2em'># set receiving buffer size in 4kB pages (thus 4096 equals to 16MB) | <font size='2em'># set receiving buffer size in 4kB pages (thus 4096 equals to 16MB) | ||
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'''cat /dev/image_raw2 > /tmp/test.raw'''</font> | '''cat /dev/image_raw2 > /tmp/test.raw'''</font> | ||
| − | ==Displaying== | + | ==<font color='darkblue'>Displaying</font>== |
===ImageMagick=== | ===ImageMagick=== | ||
* Camera settings: 2592x1936 JPEG, actual pixels available: 2608x1940 | * Camera settings: 2592x1936 JPEG, actual pixels available: 2608x1940 | ||
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The result is a colored tiff image. Pixel values are linear. | The result is a colored tiff image. Pixel values are linear. | ||
| − | ==Processing== | + | ==<font color='darkblue'>Processing</font>== |
===Python=== | ===Python=== | ||
* Camera settings: 2592x1936 JPEG, actual pixels available - 2608x1940: | * Camera settings: 2592x1936 JPEG, actual pixels available - 2608x1940: | ||
Revision as of 11:24, 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
