| 摘要 |
A motion detector comprises a computer program that uses a digital camera data stream to detect image scene changes; differences between the current and previous video frames are used, e.g. by subtracting (RGB) pixels. A filter can be used to reduce noise in the frame images, and edges of change may be accentuated by a change summation algorithm; that is, edges of true moving features - indicated by contiguous pixels, for example - score more highly than random pixel changes. The amount of noise suppression and the threshold for motion detection may be configured. Upon movement detection, the camera can record or stream live video or save images to a local or remote computer, and optionally alert an operator. Rows and columns are traversed and corrected change scores are summed providing a total change score; previous and current pixel changes are multiplied together so actual motion scores highest. The total sum of change is then used to calculate an average change threshold (rolling basis). |
