Stepper motor pointer meter video reading method for state-IV commercial automobile instruments

Abstract

The invention discloses a stepper motor pointer meter video reading method for state-IV commercial automobile instruments, comprising the following steps: (1) using a camera to capture each frame of video image, and representing the current frame as I(x, y), wherein (x, y) represents the coordinate of a pixel, and I represents the RGB value of the pixel; (2) calibrating a background image, and building a pointer-free background image, wherein the camera captures the first N frames of images of a video to reconstruct a background, N is a natural number, the highest-frequency pixel is selected as a mark point for each point (x, y) in the N frames of images, all the pixels of which the error is between -a and +a are selected as candidate points of the background by taking the coordinate of the highest-frequency pixel as the center, and the pixels are averaged to get a constructed background image; (3) implementing detection using background differencing; and (4) calculating the number of pixels of a bright point in the image after differencing, and calculating the scale value to which the pointer points in real time according to the pixel area of the bright point and the calibrated dial data information.

Description

technical field [0001] The invention relates to the field of automobile instrument panel detection, in particular to a method for video reading of a pointer meter head of a stepping motor of a National IV commercial automobile instrument. Background technique [0002] With the development of informatization, electronics industry and chip packaging technology, automotive instrumentation has gone through four different stages, namely: mechanical instrumentation (first generation instrumentation, based on mechanical force), electrical instrumentation (second generation instrumentation) , based on the principle of electrical measurement), analog circuit electronic meters (the third generation of meters, which are similar to electrical meters, but use electronic devices to replace the original electrical devices) and stepping motor type full digital automotive meters (fourth generation meters , its signal transmission mode has changed from analog signal to digital signal, and is ...

AI Technical Summary

Problems solved by technology

[0003] At present, most commercial vehicle instruments use stepping motor type combination instruments. Due to the difficulty in detecting the deflection angle of the pointer, the deflection value is not easy to convert into an electrical signal. Most of the detection of commercial vehicle instruments is manually carried out item by item, which is inefficient in the production of instruments. Low and other issues

Although there are literatures that use video processing methods to detect pointer deflection, they mostly use complex image processing algorithms. Although the accuracy is improved, the detection speed is seriously reduced, and the complex processing algorithms are difficult to develop and the labor cost is high.

Images