Automobile defrosting test-used foreside windscreen area acquisition method under low temperature warehouse environment
A front windshield and low temperature bin technology, applied in image data processing, instruments, calculations, etc., can solve the problems of reduced test efficiency, inaccurate test data, large manual measurement errors, etc., to improve test efficiency, improve calculation accuracy, The effect of reducing manual operations
Active Publication Date: 2018-08-21
ANHUI AGRICULTURAL UNIVERSITY
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Problems solved by technology
At present, many enterprises need to manually measure the side length of the window with a tape measure before the test in order to obtain the area value of the windshield when conducting the defrosting performance test of the air conditioner, and then calculate the area value of the window glass, and the shape of the window glass is complex , is not a simple trapezoidal or rectangular shape, the manual measurement error is large, and the arc part cannot be measured well. This test method will greatly reduce the test efficiency, affect the water value sprayed by the frosting device, and the test data is not accurate enough. , the accuracy is not high enough, which will have a great impact on the test of the windshield defrosting system, and the more serious consequence is that the defrosting test of the car windshield cannot be carried out normally
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[0049] In this embodiment, a method for obtaining the area of the windshield based on the defrosting test of the automobile in the low-temperature chamber environment is to collect the original image of the windshield based on the camera system, and to calibrate the original image of the windshield to obtain the coefficient k. Calculate the boundary coordinate points of the original image of the windshield based on the gray-scale transition rule of the car window frame, and obtain the actual area of the front windshield window. Specifically, as figure 1 As shown, proceed as follows:
[0050] Step 1. Cover the central area of the front windshield of the car with a circular dot matrix calibration plate; and use the camera to collect the original image A of the front windshield with the circular dot matrix calibration plate under the low temperature chamber;
[0051] Step 2, using formula (1) to obtain the calibration coefficient k:
[0052]
[0053] In formula (1), L ...
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The invention discloses an automobile defrosting test-used foreside windscreen area acquisition method under a low temperature warehouse environment. The method comprises steps: under the low temperature warehouse environment, the original image of the foreside windscreen is acquired and saved through a camera, the original image is calibrated and a coefficient is acquired; according to an image gray jump difference law, a window boundary coordinate point in the original image of the foreside windscreen is determined, the foreside windscreen pixel area is calculated, and the calibration coefficient is already known to acquire the actual area of the foreside windscreen. The foreside windscreen area is calculated based on a camera system, time and labor are saved, automatic test is convenient and efficient, manual measurement errors are reduced, and the method is applicable to different types of automobiles to automatically calculate and display the area value of the foreside windscreenin real time.
Description
technical field [0001] The invention belongs to the field of automobile control and detection, and more specifically relates to a method for automatically calculating the area of a front windshield for an automobile defrosting test in a low-temperature chamber environment based on a camera. Background technique [0002] Automobile air conditioner is an essential part of automobile structure. It needs air conditioner to cool in summer and air conditioner to heat in winter. Automobile air conditioner has been widely used in automobiles. Ride comfort has a crucial impact. If the car has no defrosting, defogging ability or poor performance, it will seriously affect the driver's field of vision, causing the driver to be unable to continue driving the vehicle, and even more serious situations such as traffic accidents will occur. Therefore, in order to ensure that the vehicle can run normally in bad weather, any vehicle needs to have a defrosting and defogging system that meets...
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Login to View More IPC IPC(8): G06T7/62
CPCG06T7/62
Inventor 张小龙程琳陈发发井梅刘鹏飞钱鹏胡博文
Owner ANHUI AGRICULTURAL UNIVERSITY