Color indexing-based marine radar echo image transmission method

Abstract

The invention relates to a color indexing-based marine radar echo image transmission method. The method includes the following steps that: echo brightness and blanking time of echo afterglow are determined, and an echo image color index table is established; 16-bit RGB data of each pixel of an echo image are converted into 8-bit image index data; a data processing unit transmits two adjacent 8-bit image index data to a display terminal together; the display terminal receives the image index data, and segments the image index data into a group of high single-byte data and a group of low single-byte data according to double-byte data width and performs mutual exchange on the high single-byte data and the low single-byte data, and inquires truth 16-bit RGB color values in the color index table; the converted RGB color values are combined so as to form an echo display image which is stored in a display cache and is subjected to display processing; and step one to step five are repeated until echo acquisition terminates. Compared with an original transmission method, with the transmission method of the invention adopted, only one half of data transmission channel bandwidth is occupied, and transmission efficiency is improved by 100%, and radar echo image data which are acquired with a high speed can be continuously and stably transmitted to the display terminal so as to be displayed.

Description

technical field [0001] The invention relates to the technical field of radar echo image transmission, in particular to a color index-based marine radar echo image transmission method. Background technique [0002] Marine navigation radar is an essential basic equipment for modern ships, which can be used to determine the position of the ship and prevent collision accidents. At the same time, the marine navigation radar can also accurately capture the information of other ships on the water or objects on land. Ordinary civilian marine radars have high requirements for cost control, so embedded computers are generally used to realize echo display and target acquisition operations. However, the display size of marine radar displays is getting larger and higher, and the display resolution is getting higher and higher. This results in a significant increase in the number of echo data and images. Therefore, how to more effectively utilize the bandwidth of the image data transmis...

AI Technical Summary

Problems solved by technology

In the application process of this image transmission method, two problems are particularly prominent: first, when the radar image is displayed with high resolution and large size, the image transmission channel cannot meet the image data transmission requirements. In addition, when the radar antenna rotates at a high speed , too much real-time image data is generated, and the radar echo image in the image transmission channel cannot be transmitted to the image acquisition and processing device in time, which will cause the loss of the radar echo image; second, the radar echo image generally only has three For example, black is the background color, yellow is the color of the scanning line, and green with different brightness indicates the different intensity of the target echo. It can be seen that there is no need to directly express three tones with up to 16-bit data width, and directly transmit the original 16-bit color image data Greatly "wasted" the bandwidth of the image transmission channel

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