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framebuffer里存的是什么？我想在framebuffer中存自己想看到的图片
framebuffer里面的是图像。
snapshot会将图片放进去，各种算法都是对framebuffer进行操作。
img就是framebuffer的图像。
如果你想导入图片：
http://book.openmv.cc/example/03-Drawing/copy2fb.html