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Method for recognizing a liquid level using temporal variation in the distribution of the pixel concentration in images, and apparatus for recognizing a liquid level using same

A recognition method and boundary interface technology, which can be used in the fields of optical devices, liquid/fluid solid measurement, image analysis, etc., and can solve problems such as misrecognition

Inactive Publication Date: 2011-08-24
KOREA INST OF CIVIL ENG & BUILDING TECH
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Problems solved by technology

In this case, when viewed from the captured image, the difference in color density between the upper and lower sides appears to be large at the boundary between the base and the pier, and this may cause misrecognition of the boundary between the base and the pier In the case of a liquid boundary surface

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  • Method for recognizing a liquid level using temporal variation in the distribution of the pixel concentration in images, and apparatus for recognizing a liquid level using same
  • Method for recognizing a liquid level using temporal variation in the distribution of the pixel concentration in images, and apparatus for recognizing a liquid level using same
  • Method for recognizing a liquid level using temporal variation in the distribution of the pixel concentration in images, and apparatus for recognizing a liquid level using same

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[0029] The method for identifying the liquid boundary surface of the present invention identifies the liquid boundary surface based on the images obtained by continuously photographing the water level marker 101 in a manner that contains the liquid boundary surface, and is characterized in that it includes: Perform grayscale image processing on the image, and digitize the pixels distributed along the X direction and Y direction according to the density (S1); from the digitized image of each pixel, only extract the The direction shows the step (S2) of the image of the scale area of ​​the main scale and the sub-scale; according to the image corresponding to the scale area extracted, the numerical values ​​of all pixels in the X direction that are located at the same position in the Y direction are summed up to obtain Get the value of each pixel in the Y direction totaled, thereby forming the step of histogram data for the Y direction of the pixel (S3); for each of the continuous ...

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Abstract

The present invention relates to a method for recognizing a liquid level using temporal variation in the distribution of the pixel concentration in images, and to an apparatus for recognizing a liquid level using same. The method comprises: performing gray-image processing on the image captured so as to contain a liquid level and digitizing each pixel distributed in the X-axis direction and the Y-axis direction in accordance with the concentration of the pixel; extracting only the image for the X-axis direction scale zone on a watermark; adding numerical values of pixels in the Y-axis direction in the extracted image to generate histogram data for the Y-axis direction of pixels; comparing histogram data of images captured before and after a certain time; determining whether or not a difference higher than a preset incremental value occurs in the histogram data; and recognizing, as a liquid level, the Y-axis direction position (height) of the pixel from which the difference higher thanthe preset incremental value starts.

Description

technical field [0001] The present invention relates to a liquid boundary surface recognition method and a liquid boundary surface recognition device using the concentration distribution changes of pixels in time in an image. The phenomenon of temporal variation, confirming the temporal variation of the density of each pixel in the Y direction of the image to identify the boundary surface of the liquid, thereby reducing the error in the measurement of the liquid height such as the water level of the river and the water level of the liquid storage tank (tank) A method for identifying a liquid boundary surface that minimizes and improves the accuracy of liquid height measurement and a liquid height identifying device that uses the method to identify liquid heights are provided. Background technique [0002] For the case of measuring the height of a liquid as in the case of measuring the water level of a river or measuring the water level of a dam (DAM), or measuring the water ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/02G01B11/22G06T7/00
CPCG01F23/292G01F23/02G06T2207/20068G06T7/004G06T7/70G01B11/22G06T1/0007G06T7/60
Inventor 权诚一金源李瓒柱金东求李惠恩柳民旭
Owner KOREA INST OF CIVIL ENG & BUILDING TECH
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