Pointer instrument reading automatic identification method based on a single-point multi-box detector

A technology of meter reading and automatic identification, applied in the field of meter detection, can solve problems such as screen jitter, multi-dial detection, insufficient light, etc.

Inactive Publication Date: 2019-04-05
WUHAN UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for automatic recognition of pointer instrument readings based on a sing...

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  • Pointer instrument reading automatic identification method based on a single-point multi-box detector
  • Pointer instrument reading automatic identification method based on a single-point multi-box detector
  • Pointer instrument reading automatic identification method based on a single-point multi-box detector

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Embodiment approach

[0108] Step 1: Generate an enhanced image using a low-light enhancement method based on a multi-exposure fusion framework; recover a clear image from a blurred image using a two-stage kernel estimation method to remove motion blur;

[0109] The low-light enhancement method based on the multi-exposure fusion framework described in step 1 is:

[0110] The multi-exposure fusion framework consists of four main components;

[0111] The first component is the multiple exposure sampler, the output of the sampler is a set of exposure ratios {k 1 , k 2 ,...,k N}, where N is the number of images to be generated;

[0112] The second is called the multiple exposure generator, and its key is to find a suitable camera response model: the exposure ratio k i The relationship with the brightness transformation function g is P i =g(P,k i ), P i Denotes the image mapped from the input image P in the exposure set;

[0113] The third part, called the multi-exposure evaluator, determines th...

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Abstract

The invention provides a pointer instrument reading automatic identification method based on a single-point multi-box detector. The method comprises the following steps of Generating an enhanced imageby adopting a low-light enhancement method based on a multi-exposure fusion framework, and recovering a clear image from the blurred image by adopting a two-stage kernel estimation based motion blurremoval method; Designing a dial detector SSD structure based on VGG-16 network and convolutional neural network to detect the dial in the image, output dial position and confidence information ; Constructing a training data set, training SSD network parameters by using the training data set, and setting related parameters and a learning strategy; Accelerated robust features of the image are extracted to generate feature point descriptors, and the rotating dial plate image is corrected according to the feature matching technology; Detecting and extracting an edge image by using a CannyLines line segment detection algorithm based on a gradient amplitude, collecting a collinear point group from the edge image and fitting the collinear point group into a straight line final verification linesegment; And determining the optimal line segment as the real position of the pointer, and calculating the reading of the pointer in the dial plate by using the relationship among the angles.

Description

technical field [0001] The invention belongs to the technical field of instrument detection, in particular to an automatic identification method for pointer instrument readings based on a single-point multi-box detector. Background technique [0002] Pointer instruments are widely used in various industries, such as power plants, substations, production workshops, oil exploration sites, etc., to obtain data such as pressure and temperature of objects. Manual reading is a widely used instrument reading method. Staff patrol regularly, estimate meter readings by eye, and record them in a log. However, manual readings are affected by many factors, such as visual fatigue, lack of energy, too long observation distance, improper observation angle, etc., which will cause unnecessary errors and fail to detect sudden changes in parameters during equipment operation in time. In addition, in power enterprise factories such as substations, there are high-voltage electricity in many are...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06T5/00G06T5/50G06T7/13G06T7/181G06T7/60G06N3/04G06N3/08
CPCG06N3/08G06T5/003G06T5/50G06T7/13G06T7/181G06T7/60G06T2207/20084G06T2207/20081G06T2207/20201G06T2207/20221G06V20/10G06V2201/02G06N3/045
Inventor 张海剑王慧娇蔡忠强
Owner WUHAN UNIV
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