GRAPHICS CONTROLLER PROVIDING A MOTION MONITORING MODE AND A CAPTURE MODE

A preferred embodiment is directed to an image processing device for receiving pixel data provided to the device as follows: it is grouped into frames, each pixel datum has an associated value, and first, second, and third pixel data correspond respectively to first, second, and third frames. The image processing device is adapted for processing the pixel data, and has a low-power motion monitoring mode and a capture mode. Further, the pixel data is preferably provided by a data source external to the device. The image processing device preferably includes a control unit for: (a) receiving the pixel data; (b) summing the values of the first pixel data to produce a first total value for the first frame; (c) summing the values of the second pixel data to produce a second total value for the second frame, and (d) causing the image processing device to process the third pixel data only if the difference between the first and second total values exceeds a threshold. If the difference between the first and second total values does not exceed the threshold, the third pixel data is discarded. Additionally, the image processing device preferably includes a memory, and the processing of the third pixel includes storing the third pixel data in the memory.