Infrared image compression method and system applied to contact network

Abstract

The invention discloses an infrared image compression method and an infrared image compression system applied to a contact network; the method comprises the following steps: S1, obtaining an infrared temperature image stream; S2, successively taking out each frame infrared temperature image in the infrared temperature image stream; S3, judging whether the current frame infrared temperature image is a first frame image of the infrared temperature image stream; S4, creating a blank infrared video compressed file and a corresponding blank index file, and writing a file header in the index file; S5, carrying out compression processing as well as frame information generation and writing on the infrared temperature image; and S6, judging whether the current frame infrared temperature image is a last frame image of the infrared temperature image stream. According to the infrared image compression method and the infrared image compression system applied to the contact network provided by the invention, through carrying out the compression processing on each frame infrared temperature image in the infrared temperature image stream collected by an infrared camera, the space for storing the infrared temperature image stream is reduced.

Description

technical field [0001] The invention relates to an infrared image compression method and system suitable for catenary. Background technique [0002] The railway catenary provides reliable and uninterrupted electrical energy for railway trains (locomotives and motor vehicles), and transmits electrical energy to the train through power supply lines and pantographs (referred to as pantographs); The important parameters of monitoring, the usual calculation method is to first take the image of the contact part of the pantograph and the power supply line, and then calculate the conductance value and pull-out value through image analysis; use thermal infrared imaging equipment to take pantograph-catenary images, regardless of day and night The light environment is limited. By adjusting the focus, the infrared temperature data of the pantograph-network part can be accurately obtained. [0003] The pantograph-catenary infrared image is actually a temperature data matrix, and the pix...

AI Technical Summary

Problems solved by technology

[0003] The pantograph-catenary infrared image is actually a temperature data matrix, and the pixel value is the temperature value of the corresponding pixel point; because the temperature data may have negative values, especially in winter, and the pixel values ​​​​of the image used by the computer to display are positive values, so directly obtain The infrared image cannot be directly displayed; because the temperature data may have a large range of values, for example, when the sun is photographed, the temperature value range may be 20 degrees Celsius to 300 degrees Celsius, while the temperature value of the pantograph-network part at this time may be 20 degrees Celsius to 40 degrees Celsius Celsius, when the temperature data matrix is ​​converted into a grayscale image, the pixel value of the pantograph-network part is small and located near zero, and the display of the pantograph-network part tends to be black, which is difficult to see clearly

In addition, in order to obtain higher precision, the variable type of the temperature value stored in the computer is generally 16-bit wide, while the variable type of the pixel value of the grayscale image is 8-bit wide. If the infrared image with the 16-bit wide is directly stored, After loading and reading data in the later stage, it is necessary to re-convert the infrared image with a 16-bit word width into an 8-bit word-wide grayscale image, which reduces the speed and efficiency of image processing

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