Radar video signal encoding method for ship

Abstract

The invention discloses a radar video signal encoding method for a ship. A radar video signal for the ship is a polar coordinate image, and a circular image under a rectangular coordinate is displayed at a display end, so coordinate conversion of the image is needed. In the conventional encoding method, the problem of the coordinate conversion is generally not considered; and human eye characteristic during image display is not considered by the conventional coordinate conversion method. In the method, a sector is selected as an encoding unit, and the method conforms with the human eye characteristic, so real-time transmission of video information is facilitated; and by selecting a rational sector point sorting mode, leakage points generated in the coordinate conversion process are eliminated, subsequent run length encoding and entropy encoding are facilitated, and compression ratio is improved. The method specifically comprises the following steps of: establishing a sector structure to form a sort table; querying the sort table to perform the coordinate conversion; and performing the run length encoding and the entropy encoding on a converted one-dimensional signal and performing data flow encapsulation so as to encoding all radar video signals.

Description

Technical field [0001] The invention belongs to the technical field of marine radars, and particularly relates to video signal coding therein. Background technique [0002] Marine radar is one of the indispensable navigation equipment for ships. The development of digital computing technology and large-scale integrated circuit technology in recent decades has laid the foundation for digital marine radar, that is, using computer information processing technology to convert radar electromagnetic signals into digital Signal, or digitally encode it to facilitate the transmission and processing of information. Compared with the traditional analog radar, the digital marine radar has more stable performance, more complete functions, clearer display and more convenient operation, which is the development trend of marine radar. [0003] After the marine radar is turned on, it will not stop working, the amount of collected data is large, and the real-time requirements are high. Reducing th...

AI Technical Summary

Problems solved by technology

In addition, the marine radar video signal is a polar coordinate image, but it needs to display a circular image in rectangular coordinates on the display end, so the coordinate conversion of the image needs to be carried out. A simple conversion formula from polar coordinates to rectangular coordinates will be generated on the display end. In the case of missing points, some points cannot be displayed on the display terminal

Existing coding methods usually do not consider the problem of coordinate transformation, and the current coordinate transformation methods for image display do not combine the characteristics of the human eye

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