Visual measuring system and method for performance parameter of water-saving toilet bowl
A visual measurement and water-saving 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 measuring residual ink lines, and high cost, achieving the effects of high degree of automation, simple operation and high measurement efficiency.
Inactive Publication Date: 2007-07-11
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
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[0108] The visual measurement system of water-saving toilet performance parameters is composed of the color low-light camera 1 / 3″CCD color camera WAT-250D camera produced by Japan Watec Company, the Computar T2z1816cs wide-angle lens and the Meter-II image acquisition card produced by Canada Matrox Company. The resolution is 768×576 pixels, the technical specifications of the lens are: 1 / 3-inch CS interface, the focus range is 1.8-3.6mm, the aperture is F1.6, and the field of view is 144.2 degrees.
[0109] The parameters of the single-camera water-saving toilet performance parameter vision system are calibrated by using the two-dimensional plane solid target 10 as shown in FIG. 2 . The number of squares in the target is 10×10, and the size of the squares is 9×9mm, which is printed by a 1200dpi high-resolution laser printer.
[0110] The internal parameters of the calibrated camera are as follows:
[0111] f x = 320.769 pixels, f y = 320.899 pixels
[0112] u 0 = 387.008 ...
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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 single-camera-based visual measurement system and method for performance parameters of a water-saving toilet. Background technique [0002] Protecting and rationally utilizing water resources and avoiding water loss and waste are important strategic issues to ensure my country's national economic and social development. At present, ceramic toilets are an important and widely used sanitary ware, so the water-saving performance of ceramic toilets 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 toilet sanitary ware. However, the water-saving performance of the 6-liter water-saving toilet has no real authoritative organization or equipment to test, so the standardization of the water-sav...
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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