Method for accurately measuring length of a work piece by double camera digital imaging
A digital imaging and precision measurement technology, applied in measurement devices, optical devices, instruments, etc., can solve the problems of low resolution accuracy of measured values, large distance between pixels, and large projected image format, and achieve the accuracy and resolution of measured values. High, small distance between pixels
Inactive Publication Date: 2006-12-20
CHONGQING INST OF MECHANICAL & ELECTRICAL ENG
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Its disadvantages are: the measured value is related to the diameter of the large and small ends of the workpiece. When the axis of the workpiece is shifted to the camera or backlight, the measured length of the workpiece will be too large or too small, which will affect the length of the measured workpiece. , due to the large format of the projected image captured by the digital camera, the distribution of pixels per unit length is small, and the distance between pixels is large, so that the accuracy and resolution of the measured value are low
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[0018] Below in conjunction with accompanying drawing and embodiment the present invention will be described in further detail:
[0019] The method for precisely measuring the length of a workpiece with dual-camera digital imaging provided by the present invention is to use an area-array CCD for imaging. When taking pictures, the distribution of light is changed into the distribution of pixel power, and the pixel power represents the gray value of the pixel. / digital conversion to form a digital image. The value of the length to be measured is obtained through transmission, storage and processing. figure 1 , taking the measurement of the length of a workpiece 1 with a small end face and a large end face on the automatic detection line as an example, the steps are described in detail as follows:
[0020] (1), the workpiece 1 is placed between the two measuring surfaces of the semi-ring gauge 2, the axis of the workpiece 1 is perpendicular to the measuring surface of the gauge ...
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The invention provides a method for measuring the length of the work-piece precisely by the double-cameras digital imaging, which comprises the following steps: a) setting the work-piece between two measuring sides of the gage, the axis of the work-piece is vertical to the measuring sides; b) setting two digital cameras and two negative light sources on each side of the axis individually, and the cameras are connected with the image processing device, c) shooting the images which is projected to the negative light sources using two digital cameras, the images are corresponding with the distance from the end-face of the work-piece to the measuring surface; d) computing the distances of two end-faces to the corresponding measuring surfaces through the digital image processing technique, and converting the length. The measured value has no relation to the end-face diameter, and cannot be affected when the axis deviating the digital camera or source. The image has small size and dense pixel distribution, and the distance of the pixel is mall, so the value is precise.
Description
technical field [0001] The invention belongs to the technical field of non-contact length detection, and in particular relates to a method for precisely measuring the length of a workpiece with dual-camera digital imaging on an automatic high-speed detection line. Background technique [0002] At present, on the automatic inspection line, the digital imaging length inspection method can be used for high-speed and precise inspection of the length of workpieces such as cylindrical pins, that is, an area-array CCD digital camera and a backlight are placed on both sides of the workpiece axis. , Use a digital camera to take a projected image of the workpiece on the backlight. Because the area-array CCD is composed of a matrix of pixels (photosensitive NP junctions), when taking pictures, the distribution of light is changed into the distribution of pixel power. Transmission, storage and digital image processing, the image processing device calculates the length value of the work...
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IPC IPC(8): G01B11/02G01B21/02
Inventor 罗伯良刘威闫宪李严
Owner CHONGQING INST OF MECHANICAL & ELECTRICAL ENG