fswebcam
fswebcam -r 640x480 output1.jpeg --scale 320x240 output2.jpeg
gd
1)./configure --host=arm-none-linux-gnueabi --with-jpeg=/opt/armv6/codesourcery/arm-none-linux-gnueabi/libc/lib/ --prefix=/opt/armv6/codesourcery/arm-none-linux-gnueabi --with-png=/opt/armv6/codesourcery/arm-none-linux-gnueabi/libc
2)修改Makefile
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