@kidswong999 我是将template.bmp保存到内存卡里面，然后再调用的，运行到images.difference时提示OSError： images not equal!

@kidswong999 格式全是RGB565时是可以的，只是效果不太好！格式全都是灰度图时且大小相同，出现错误，大小和图像格式都是相同的！

import sensor, image, time

sensor.reset()                      # Reset and initialize the sensor.
sensor.set_pixformat(sensor.GRAYSCALE) # Set pixel format to RGB565 (or GRAYSCALE)
sensor.set_framesize(sensor.QQVGA)   # Set frame size to QVGA (320x240)
sensor.skip_frames(time = 2000)     # Wait for settings take effect.
sensor.set_auto_whitebal(False)
clock = time.clock()                # Create a clock object to track the FPS.

clock.tick()# Update the FPS clock.
img = sensor.snapshot().mean(1)
template = image.Image("/template.bmp")
sensor.skip_frames(time = 2000)
diff = img.difference(template)

在RGB565格式时是可以用的