Cascadable camera tampering detection transceiver module

A camera tampering detection transceiver module for receiving input video sequence, generating camera tampering feature, synthesizing camera tampering information with said input video sequence and outputting synthesized video sequence, said camera tampering detection transceiver module comprising:

• a processor;
• and
• a data storage device, said data storage device storing:
• a camera tampering image transceiving module, for receiving said input video sequence, decoding camera tampering image from said input video sequence, separating said camera tampering image from said input video sequence, synthesizing said camera tampering image with said input video sequence, and output said synthesized video sequence;
• an information control module, connected to said camera tampering image transceiving module, for accessing camera tampering feature of said input video sequence, determining camera tampering event and selecting whether to output said input video sequence directly or synthesize and output synthesized video sequence;
• and
• a camera tampering analysis module, connected to and controlled by said information control module for determining whether to analyze said input video sequence and generate camera tampering feature to provide to said information control module for determination;
• wherein said processor is able to execute said camera tampering image transceiving module, said information control module and said camera tampering analysis module stored in said data storage device;
• wherein said camera tampering image transceiving module further includes:
• a camera tampering image separation element, for receiving said input video sequence, detecting and separating tampering image and non-tampering image of said input video sequence, said tampering image being processed by a camera tampering image transformation element, said non-tampering image being processed by said information control module or said camera tampering analysis module;
• a camera tampering image transformation element, connected to said camera tampering image separation element, for transforming said tampering image into tampering feature or tampering event if tampering image existing;
• a synthesis description setting unit, for storing a plurality of descriptions of manners of synthesizing;
• and
• a camera tampering image synthesis element, connected to said synthesis setting description unit, said information control module and said camera tampering image transformation element, for receiving said input video sequence, synthesizing said input video sequence according to said descriptions of manners of synthesizing stored in said synthesis description setting unit, and outputting said synthesized video sequence;
• wherein output video of said camera tampering image transceiving module being from said camera tampering image synthesis element, said camera tampering image separation element, or said original input video sequence;
• and a multiplexer being used to control connecting said above three output videos to output of said information control module, input of said camera tampering analysis module or input of said camera tampering image synthesis element according to computation result;
• wherein said camera tampering image separation element uses an image mask method to compute difference and filter qualified pixels, sets a threshold to filter said pixels, uses connected component extraction method to find connected components formed by said pixels, filters out over-large and over-small connected components, and filters remaining connected components by comparing shape, and obtained result is coded image candidate;
• and
• wherein said coded image has a shape of rectangle or square, said operation of filtering remaining connected components by comparing shape is based on computing similarity of said connected component and a square, said similarity is expressed as Npt/(W×H), Npt is the number of pixels in said connected component, W and H are the farthest distance between two points of said connected component along horizontal and vertical axis respectively.