Visual measuring system and method for performance parameter of water-saving toilet bowl
A water-saving and toilet technology, applied in the field of measurement, can solve the problems of difficulty in placing calibration targets on the plane where the ink line is located, difficulty in realizing residual ink line measurement, and high cost, and achieve high automation, simple operation, and high measurement efficiency.
Inactive Publication Date: 2009-03-11
BEIHANG UNIV
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Problems solved by technology
The main difficulty in measuring the length of the residual ink line is that the ink line is free-shaped and irregular. The ink line is 25mm below the toilet ring and is easily blocked by the edge of the toilet ring. It is difficult to observe all the remaining ink lines from different angles. In addition, it is difficult to place the ink line on the plane where the ink line is located. Calibration target, must use wide-angle lens
Based on the technical means of three-dimensional measurement, the cost is high and the ink line can be observed by multiple cameras from different angles at the same time, so the three-dimensional measurement technology is difficult to measure the residual ink line
Method used
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[0107] The color low-light camera 1 / 3"CCD color camera WAT-250D camera, Computar T2z1816cs wide-angle lens and Meter-II image capture card produced by Matrox Company of Canada are used to form a water-saving toilet performance parameter visual measurement system. Image The resolution is 768×576 pixels, the lens technical indicators are: 1 / 3 inch CS interface, focusing range 1.8~3.6mm, aperture F1.6, field of view angle of 144.2 degrees.
[0108] Use as figure 2 The two-dimensional planar solid target 10 shown is to calibrate the parameters of the visual system of the performance parameters of the single-camera water-saving toilet. The number of squares of the target is 10×10, the size of the squares is 9×9mm, and it is printed with a 1200dpi high-resolution laser printer.
[0109] The internal parameters of the camera after calibration are as follows:
[0110] f x = 320.769 pixels, f y = 320.899 pixels
[0111] u 0 =387.008 pixels, v 0 = 316.596 pixels
[0112] k 1 =-2.567×10 -1 ...
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The invention relates to single camera water saving toilet performance parameter visual inspection system and method. It comprises camera with orthostigmat, adjusting device, working platform, computer, image sampling card, calibration target, steel rule and ink drawing device. The orthostigmat camera takes the picture of the residue ink line, extracting its image coordinate, calculating the projection coordinate based on the camera model, getting the space measuring coordinate of the residue ink line through the project coordinate based on the math model of the measurement system, and getting the real length of the ink line through the space measuring coordinate. It realizes non-contact automatic measurement with simple operation and high efficiency.
Description
Technical field [0001] The invention belongs to the technical field of measurement, and relates to a visual measurement system and a measurement method for the ink line length in the performance detection of a water-saving toilet based on a single camera. Background technique [0002] The protection and rational use of water resources and the avoidance of water loss and waste are important strategic issues to ensure my country's national economic and social development. At present, the ceramic toilet is an important and commonly used sanitary ware, so the water-saving performance of the ceramic toilet directly affects the utilization of water resources. Reducing the flushing volume of ceramic toilets is an effective way to save water. Water-saving toilets with a water consumption of 6 liters have gradually become the mainstream products of toilets. However, the water-saving performance of the 6-liter water-saving toilet has not been tested by a truly authoritative institution or ...
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IPC IPC(8): G01M19/00G01B11/03G01C11/00G01M99/00
Inventor 周富强周浩敏何孟轲肖胜然王维闫蓓
Owner BEIHANG UNIV