A fast watershed detection method for a circular mark in a helicopter blade image

A detection method and helicopter technology, applied in image analysis, image data processing, instruments, etc., can solve the problems of detection method missed detection speed and other problems, and achieve the effect of overcoming slow speed, overcoming serious missed detection, and high degree of automation

Inactive Publication Date: 2019-01-11
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a fast watershed detection method for the circular mark of the helicopter blade image under low exposure and high-speed rotation, aiming to solve the problems of missed detection by existing detection methods and slow speed of traditional marking watershed methods

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  • A fast watershed detection method for a circular mark in a helicopter blade image
  • A fast watershed detection method for a circular mark in a helicopter blade image
  • A fast watershed detection method for a circular mark in a helicopter blade image

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Embodiment Construction

[0032] The blade image in the embodiment of the present invention is that the binocular stereo camera that is placed on the ground vertically upwards shoots the rotor blade of the helicopter test tower and obtains; The field of view is 25°, the vertical field of view is 12.5°, the focal length of the lens is 12mm, the shooting distance is 5m, the field of view of a single camera at the measurement position is about 4.66m×2.22m, the image resolution is 2040pixel×1024pixel, The time is 40us. In this embodiment, the computer configuration is a quad-core Intel Core(TM) i5-3470CPU@3.2GHz, 8GDDR RAM.

[0033] In the present invention, the blade spraying circular logo adopts 2 rows and 12 columns, the same shape, and a black circle center mark with a diameter of 40mm. The paddle is sprayed in white, and the center distance in the row direction is 60mm, and the center distance in the column direction is 90mm. The real picture is as follows figure 1 shown.

[0034] The present invent...

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Abstract

The invention discloses a fast watershed detection method for a circular mark in a helicopter blade image, which comprises the following steps: 1) constructing a parallel processing frame; 2) fast extracting local extremum features based on image downsampling; 3) identifying the local extremum of the circular mark based on the preset pattern; 4) performing fast marking of the region of interest (ROI) of the circular mark based on a lookup table; 5) performing ROI local gradient calculation; 6) performing ROI local watershed transform. The invention has the advantages that the single pixel linewidth continuous edge of all circular marks in the low-exposure blade image can be accurately extracted, and the detection efficiency of the circular marks in the helicopter blade image is improved; at the same time, the method has the advantages of strong anti-jamming ability and high degree of automation, and can be used to detect and locate circular marks in the visual measurement of helicopterblade motion parameters.

Description

technical field [0001] The invention relates to a rapid watershed detection method for a geometric mark, in particular to a fast watershed detection method for a circular mark in a helicopter blade image under low exposure and high-speed rotation. Background technique [0002] When visually measuring the blades of a helicopter rotating at high speed, the image has the characteristics of low exposure, motion blur, logo deformation, and high resolution. The spatial position of each artificial logo on the blade is accurately measured through stereo vision, and it is required to quickly and accurately locate each part of the image. A manual identification, which is a technical problem. [0003] A circle is a geometric shape with rotation invariance, and a circular mark is one of the most commonly used artificial marks in machine vision. The circular mark on the paddle undergoes perspective deformation during imaging and elastic deformation of the paddle, forming a circle-like t...

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Application Information

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IPC IPC(8): G06T7/155G06T7/13G06T7/62
CPCG06T7/13G06T7/155G06T7/62
Inventor 欧巧凤张育斌熊邦书雷鸰
Owner NANCHANG HANGKONG UNIVERSITY
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