A Color Index-Based Method for Image Transmission of Marine Radar Echoes

Abstract

The invention relates to a method for transmitting a marine radar echo image based on a color index, which determines the echo brightness and the blanking time of the echo afterglow, and establishes an echo image color index table; the 16-bit RGB data of each pixel of the echo image Converted to 8-bit image index data; the data processing unit transmits two adjacent 8-bit image index data to the display terminal; the display terminal receives the image index data, and divides the image index data into high and low two groups of single The byte data is exchanged with each other, and its true 16-bit RGB color value is queried in the color index table; the converted RGB color value is combined into an echo display image and stored in the display cache for display processing; repeat steps 2 to 5, until the end of echo collection. Compared with the original transmission mode, the present invention only occupies half of the bandwidth of the data transmission channel, improves the transmission efficiency by 100%, and enables the radar echo image data collected at high speed to be continuously and stably transmitted to the display terminal for display.

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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