A Multi-track Absolute Grating Ruler Image Coding and Decoding Method

Abstract

The invention discloses a multi-track absolute grating scale image coding and decoding method. The coding method includes the steps of employing a searching algorithm to encode the multiple information of a multi-track absolute grating scale to obtain the multiple information code of the multi-track absolute grating scale, wherein the searching algorithm can encode with maximal same sub-string length as a characteristic and can flexibly adjust the coding quantity and coding scope, decomposing the multiple information code of the multi-track absolute grating scale to multiple binary code tracks, conducting position coding on the binary code tracks to obtain a corresponding binary code track code, adding labels to the code words of the binary code track code to obtain a final code, and compiling each code word and positional information of the final code into a table for storage. The method is simple and highly effective, the coding is wide in scope and can be flexibly adjusted. Decoding can be done in high speed and high accuracy. The method is widely applicable to the coding field.

Description

technical field [0001] The invention relates to the coding field, in particular to a multi-track absolute grating ruler image coding and decoding method. Background technique [0002] Grating ruler is a precision position measurement method widely used on machine tools. According to the main measurement principle, it can be divided into incremental code grating ruler based on Moiré fringe occlusion or interference and absolute code grating ruler based on absolute code measurement (also called absolute code Encoder). Compared with the incremental code grating ruler, the absolute code grating ruler encodes each position. In actual use, the absolute code grating ruler can still read the position information after restarting without returning to zero under unexpected circumstances such as power failure. There is also no cumulative error due to homing. These advantages make the absolute code grating ruler attract more and more attention under the trend of increasing automation....

AI Technical Summary

Problems solved by technology

[0003] However, the current absolute code grating ruler, especially the multi-track absolute grating ruler, does not have a unified international encoding and decoding standard, which makes the structure of the grating ruler complex, the encoding range is not enough and cannot be adjusted flexibly, the decoding speed is slow and the accuracy is low

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