Image processing method based on vertical-and-horizontal-conversion amplifying grating and application thereof

Abstract

The invention relates to an image processing method based on a vertical-and-horizontal-conversion amplifying grating and an application thereof. The method comprises the following steps of 1), preprocessing a grating image and reconstructing a grid line; 2), adding a virtual oblique line on the reconstructed grid line, and converting refining in a gate distance direction to a grid line length direction, and adjusting an amplification power; 3), performing line summation on a pixel matrix, and finding out an intersection point between the reconstructed grid line and the virtual oblique line; and 4), through a triangular similar relation, calculating a micro displacement and an integral displacement which are represented by the number of pixels through acquiring the relative position of the intersection point to two ends of the grid line, the grating distance and a grating number reading head pulse number N. The image processing method settles wastage of defective gratings caused by factors such as operation, process and tools in grating manufacture and measurement error caused by phenomena such as damage, spot and inclination in a long-term use process. Cost is greatly saved. The image processing method has advantages of high calculation amount, high speed and effective production efficiency improvement.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an image processing method based on vertical and horizontal conversion and amplifying grating scale and its application. Background technique [0002] In precision measurement, the grating ruler is an important tool, using the optical principle of the grating to perform precise displacement or angle measurement. [0003] The existing grating rulers mainly include incremental grating rulers and absolute grating rulers. Among them, the incremental grating rulers use equally spaced reticles to generate alternate light and dark Moiré fringes, and the moving distance is calculated by counting the number of fringes. count. The stripes can be subdivided according to the measurement accuracy requirements. However, when the resolution is high, steps are lost during high-speed motion. Although the absolute grating ruler does not lose steps, it needs to recognize the code throug...

AI Technical Summary

Problems solved by technology

However, the existing intersection methods require processing such as edge detection and image sharpening, which requires a large amount of calculation.

On the other hand, due to the incompleteness, breakage and stains of the scribe line in the manufacturing process (such as image 3 shown); installation error; slight movement of the grating scale during long-term use, causing the grating line to tilt (such as Figure 5 As shown) and other factors cause certain errors in precision measurement and reduce reliability. At the same time, some unqualified products are discarded during the manufacturing process. These factors waste resources to a certain extent and consume manpower for maintenance and repair of later equipment.

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