2results about How to "Avoid downloading" patented technology

This invention proposes an on-orbit autonomous geometric calibration method and system for wide-field-of-view optical remote sensing satellites. The method includes: camera imaging and transmitting the captured images to an on-board calibration type autonomous identification module; the on-board calibration type autonomous identification module, combined with satellite orbit and attitude data, determines whether the camera's field of view simultaneously images deep space and the ground; if both exist simultaneously, the Earth's edge is extracted as the boundary between stars and landmarks to delineate their distribution areas; if not, the calibration point type is explicitly determined to be either a landmark or a star; based on the calibration point type, the corresponding image is transmitted to an on-board stellar autonomous calibration module or an on-board landmark autonomous calibration module, and geometric calibration parameters are calculated; the calculated calibration parameters are transmitted to an on-board information processing unit for satellite imaging. This invention ensures the geometric calibration accuracy across the entire field of view of the camera; it avoids the process of transmitting satellite images down to the ground for calculation, thus improving the real-time performance of the calibration parameters.

This invention provides a method and apparatus for preventing video downloading. The method includes: establishing a connection channel between a client and a server; the client requesting media data from the server; the client receiving scrambled media data and a first scrambled character description value sent by the server, the first scrambled character description value describing the scrambling information of the media data; and the client using a specific player to play the scrambled media data normally based on the first scrambled character description value. By transmitting scrambled media data, this invention ensures that even if an attacker obtains the transmitted media data, they cannot parse and restore it into playable video data, thereby effectively preventing illegal video downloading.