methods , systems and apparatuses for the detection of motion using statistics data already available within an imager , such as sharpness scores or brightness values . the method includes obtaining at least two sets of statistics data for respective image frames which include corresponding windows ; initializing a motion counter ; determining , for each window , a relative difference value for the particular window ; comparing the relative difference value to a first threshold . if the relative difference value is greater than the first threshold , the method increments the motion counter ; and determines if there is motion by comparing the value of the motion counter to a second threshold . the motion detection may further take into account the relative importance of certain areas of the image frame .