Bus type bus automobile digital instrument pointer function on-line monitoring method

Abstract

The invention discloses a bus type bus automobile digital instrument pointer function on-line monitoring method and belongs to the computer vision-based field product quality online monitoring technical field. The method can be used for automatically monitoring the function of the pointer of an automobile digital instrument and improving monitoring efficiency. The method of the invention comprises the following steps that: a pointer driving command is sent to an automobile instrument to be measured; the image of the panel of the instrument is acquired; the image is preprocessed; a pointer image is obtained through a subtraction method; the pointer image is refined; a pointer connected area is marked; by means of a minimum distance method, a pointer straight line is obtained through fitting; the pointer straight line is corrected; the reading of a pointer is calculated; and whether the reading is consistent with a preset value is judged, so that whether the function of the pointer of the instrument is qualified can be detected. The bus type bus automobile digital instrument pointer function on-line monitoring method of the invention can quickly and accurately extract the position and shape of the pointer of the automobile instrument at one time so as to realize the automatic detection of the function of the panel of the automobile digital instrument, thereby improving the efficiency and reliability of detection; and the method is suitable for digital instrument panel production line on-line detection.

Description

A method for on-line monitoring of the pointer function of a bus-type automotive digital instrument technical field The invention relates to an on-line monitoring method for the pointer function of a bus-type automobile digital instrument, belonging to the technical field of automobile instrument function monitoring. Background technique According to the different working principles of automobile meters, they can be roughly divided into three generations: the first generation of car meters is a mechanical watch; the second generation of car meters is called electrical meters; Smart and intelligent, the display content is richer. The technical requirements for its functional testing are also getting higher and higher. The pointer part of the commonly used automobile instrument is generally composed of four dials of speedometer, tachometer, water temperature gauge and fuel gauge. The testing of these four dials during the R&D process of the automotive instrument is mainly...

AI Technical Summary

Problems solved by technology

The template feature method has achieved good results in theory, but in the actual application process, this method has great time and space complexity, and the matching threshold is difficult to define

There is some complexity in implementing

The Hough transform is used to extract the straight line of the pointer to determine the position of the pointer. Since the Hough transform has a large amount of calculation and takes up a lot of memory, it takes a lot of time to calculate redundant data during the transformation process, and the voting pixels are discrete and irrelevant. Inaccurate, leading to inaccurate detected straight lines, reducing the time required for detection and improving detection accuracy, some scholars have proposed improved methods for these problems, such as ((1) Chen Bin, Jin Lianwen. A central projection for instrument pointer position detection Method [J]. Computer Application Research, 2005(1): 246-248. (2) Guo Siyu, Zhai Wenjuan, etc. Line Detection Combining Hough Transform and Improved Least Square Method [J], Computer Science, 2012(39): 196 -200) The above test methods still have the problems of slow speed and low precision

Images