CN105043302A - Single carrier interference fringe imaging quality real-time monitoring and adjusting method - Google Patents
Single carrier interference fringe imaging quality real-time monitoring and adjusting method Download PDFInfo
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- CN105043302A CN105043302A CN201510457851.3A CN201510457851A CN105043302A CN 105043302 A CN105043302 A CN 105043302A CN 201510457851 A CN201510457851 A CN 201510457851A CN 105043302 A CN105043302 A CN 105043302A
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Abstract
Provided is a single carrier interference fringe imaging quality real-time monitoring and adjusting method which belongs to the technical field of optical measurement and is to solve the problems that interference fringe shooting quality is uncontrollable, and man-made subjective factors are large in the surface shape inversion measurement of a single carrier interference fringe. The method comprises the following steps: obtaining technical index of an imaging system; obtaining image data flow; processing frame data; displaying middle-line data and middle-row data in the form of an image; adjusting display frame frequency of the middle-line data and the middle-row data; and adjusting the position relation between an interferometer and a tested mirror according to the displayed middle line and row images. Imaging quality of the carrier interference fringe is evaluated through an on-line real-time quantification method to assist measurement personnel to adjust the carrier interference fringe image quickly to a state suitable for image processing, thereby guaranteeing that the carrier interference fringe image controllable in quality and containing complete surface shape information serves as an original image of the measurement, and reducing technical processing difficulty of the follow-up image processing and surface shape inversion; and the method can control the accuracy of surface shape measurement effectively and improves repeated accuracy of the measurement.
Description
Technical field
The present invention relates to a kind of single width carrier fringe pattern image quality Real-Time Monitoring method of adjustment, belong to field of optical measuring technologies.
Background technology
In mirror shape parameter measurement, interferometer is a kind of conventional high precision measuring instrument.The measuring method of interferometer can be divided into the static striped disposal route of single width, several striped disposal routes of time-division and divide several striped disposal routes etc. mutually.It is simple and reliable that the static striped disposal route of single width has measuring equipment, and Measuring Time resolution is high, low cost, the advantage that measuring accuracy is moderate, but carries out noise pre-service by noise larger needs.Several striped disposal routes of time-division need accurate opertaing device and the low interference being easily subject to unstable environment around of temporal resolution.Divide several striped disposal routes to need more complicated instrument and equipment equally mutually, but there is higher measuring accuracy and environment resistant interference performance.
Carry out in surface shape measurement in application single width carrier fringe pattern method, the single width striped collected needs to have good image quality, everything goes well with your work carries out accurately for the follow-up stripe pattern process of such guarantee, face shape inverting, and namely the precision of this surface shape measurement inversion method has very high requirement to input stripe pattern quality.The post-processing approach focusing on stripe pattern in analytical approach in the past more, research is how by the noise reduction in the stripe pattern that obtained, and accurately effective face shape information is extracted from contaminated image, how to obtain the higher interference fringe image of image quality, the in the measurements image quality of Real-Time Monitoring striped and then ignored.At present in the process of single width carrier fringe pattern, the stripe pattern quality of shooting lacks quantitative on-line monitoring, and people is large for the factor of getting sth into one's head, and brings the uncertainty of larger difficulty and measurement to follow-up image procossing, face shape inverting work.
Summary of the invention
The present invention is in order to solve the problem that during the shape inverting of single width carrier fringe pattern face is measured, interference fringe shooting quality is not controlled, artificial subjective factor is large, a kind of single width carrier fringe pattern image quality Real-Time Monitoring method of adjustment is provided, online real time fringe quantitative quality evaluation information is provided, guarantee that the single width stripe pattern noise of shooting is low, face shape information completely, alleviate the difficulty of successive image process and face shape inverting work, contribute to the precision improving surface shape measurement.
A kind of single width carrier fringe pattern image quality Real-Time Monitoring method of adjustment, is characterized in that, comprise the following steps:
The first step, obtains imaging system technology index, comprises the size of the frame frequency of image acquisition, frame format, collection image;
Second step, obtains image data stream, according to imaging system technology index, utilizes image acquisition hardware interfacing equipment to gather image, writes software, while display gathers image in real time, obtain the frame data of image;
3rd step, processed frame data, obtain a frame according to frame format after obtaining the frame data of image and gather the middle row data of image and a middle column data;
4th step, with row data and middle column data in the middle of image format display, got middle row data and middle column data are treated as two groups of sequences, drawing image, using the ordinate of the value of data element in sequence as drawing image point, using the horizontal ordinate of the data element sequence number of sequence as drawing image point, the image of drafting can be the one-dimensional data picture presentation format of curve map or histogram;
5th step, adjustment median row data display frame frequency, the frame frequency that stripe pattern gathers is generally very fast, when the real-time adjustment interfering carrier fringe image, the frame frequency of picture quality monitoring is faster unfavorable for the adjustment of interference image, can by row, column data display frame frequency in the middle of image by software adjustment to a frame per second per second to five frames between;
6th step, according to row in the middle of display, the position relationship of row Image Adjusting interferometer and measured lens, obtain high-quality carrier fringe pattern image, the relative position relation of adjustment interferometer and measured lens can change the thickness of interference fringe, the direction of interference fringe, the adjustment interferometer intensity of light source can change the light and shade contrast of interference fringe, by the above parameters relationship of adjustment in actual measurement, row in the middle of the interference fringe of contrast Real-Time Monitoring, row image, guarantee that middle row curve image is near-sinusoidal in interference fringe image region, and adjustment after static a period of time guarantee image stabilization, and glitch noise on curve is less, guarantee that sinusoidal max min scope is approximate and be full of the whole image acquisition degree of depth, if image is eight sampling depths, sinusoidal peak-to-peak value should close in 200 to 256 scopes, the interference fringe middle column image of contrast Real-Time Monitoring, while guaranteeing that middle row image meets the demands, the position orientation relation of intense adjustment interferometer and measured lens, guarantee that the curve that the interference fringe middle column image of display in real time shows in interference fringe image region becomes less fluctuation change, maximum fluctuation change can not more than two summits or peak valley, static a period of time after adjustment, treat that interference fringe image is stable and can catch a width interference fringe image, as successive image process, the original image of face type inverting.
Obtain a frame in step 3 to gather the middle row data of image and the circular of a middle column data and be, if the width of a two field picture is w, be highly h, so the array M of a frame monochrome image gradation data and available h*w represents, if h is even number, the line number of then required row data is h/2, if h is odd number, the line number of then required row data is (h+1)/2, if w is even number, the row number of then required column data are w/2, if w is odd number, then the row number of required column data are (w+1)/2.
Good effect of the present invention: the invention solves single width carrier fringe pattern image quality Real-Time Monitoring adjustment problem, by the image quality of online real-time quantitative method evaluation carrier fringe pattern, subsidiary personnel are fast by the state of carrier fringe pattern Image Adjusting to applicable image procossing, guarantee quality controllable, contain the carrier fringe pattern image of face type information completely as the original image measured, reduce successive image process, the technical finesse difficulty of face shape inverting, the method is in successive image process, when face shape inversion method is identical can effectively chain of command type measure degree of accuracy, improve the repeatable accuracy measured.
Accompanying drawing explanation
Fig. 1: the steps flow chart schematic diagram of a kind of single width carrier fringe pattern of the present invention image quality Real-Time Monitoring method of adjustment.
Fig. 2: the middle row data of a two field picture, middle column schematic diagram data in the present invention.
Fig. 3: the width carrier fringe pattern figure that image capture device of the present invention collects.
Fig. 4: row data image in the middle of interference fringe of the present invention.
Fig. 5: interference fringe middle column data image of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details.
As shown in Figure 1, a kind of single width carrier fringe pattern image quality Real-Time Monitoring method of adjustment, the implementation step of the method is:
The first step, obtain imaging system technology index, imaging system is monochromatic CCD camera, and shooting picture size is 576*768 pixel, and shooting frame frequency is that 30 frames are per second.
Second step, obtains image data stream, and image pick-up card adopts Daheng image DH-VT110 product, and image acquisition and processing software adopts Matlab2013B.
3rd step, processed frame data, represent the frame image data collected by the matrix M of 576*768, and obtain the 288th row data of matrix, obtain the 384th column data of matrix.
4th step, as shown in Figure 2, obtains the 288th row data and the 384th column data of matrix M, data is drawn in the form of a graph, as shown in Figure 4, Figure 5.
5th step, in the middle of adjustment, row, column data display frame frequency, is adjusted to 3 frames by the display frame frequency of median row data and curves figure per second.
6th step, obtains high-quality carrier fringe pattern image according to the middle row, column Image Adjusting interferometer of display and the position orientation relation of measured lens, carrier fringe pattern image is roughly adjusted to vertical striped, as shown in Figure 3.Observe middle row curve image as shown in Figure 4, make the light and shade contrast of interference fringe larger by the light intensity adjusting two bundle coherent lights, and dynamic range covers most of image acquisition degree of depth, the relative pose of intense adjustment measured lens and interferometer makes the reasonable quantity of interference fringe, and becomes roughly sinusoidal shape.Meeting under above-mentioned condition, observe middle column curve image as shown in Figure 5, the relative pose of intense adjustment measured lens and interferometer makes middle column curve map fluctuate to change less, peak valley or summit are no more than two, static a period of time, a width carrier fringe pattern image is caught, as the original image of successive image treated side shape inverting after above-mentioned condition all meets.
Claims (2)
1. a single width carrier fringe pattern image quality Real-Time Monitoring method of adjustment, is characterized in that, comprise the following steps:
The first step, obtains imaging system technology index, comprises the size of the frame frequency of image acquisition, frame format, collection image;
Second step, obtains image data stream, according to imaging system technology index, utilizes image acquisition hardware interfacing equipment to gather image, writes software, while display gathers image in real time, obtain the frame data of image;
3rd step, processed frame data, obtain a frame according to frame format after obtaining the frame data of image and gather the middle row data of image and a middle column data;
4th step, with row data and middle column data in the middle of image format display, got middle row data and middle column data are treated as two groups of sequences, drawing image, using the ordinate of the value of data element in sequence as drawing image point, using the horizontal ordinate of the data element sequence number of sequence as drawing image point, the image of drafting can be the one-dimensional data picture presentation format of curve map or histogram;
5th step, adjustment median row data display frame frequency, the frame frequency that stripe pattern gathers is generally very fast, when the real-time adjustment interfering carrier fringe image, the frame frequency of picture quality monitoring is faster unfavorable for the adjustment of interference image, can by row, column data display frame frequency in the middle of image by software adjustment to a frame per second per second to five frames between;
6th step, according to row in the middle of display, the position relationship of row Image Adjusting interferometer and measured lens, obtain high-quality carrier fringe pattern image, the relative position relation of adjustment interferometer and measured lens can change the thickness of interference fringe, the direction of interference fringe, the adjustment interferometer intensity of light source can change the light and shade contrast of interference fringe, by the above parameters relationship of adjustment in actual measurement, row in the middle of the interference fringe of contrast Real-Time Monitoring, row image, guarantee that middle row curve image is near-sinusoidal in interference fringe image region, and adjustment after static a period of time guarantee image stabilization, and glitch noise on curve is less, guarantee that sinusoidal max min scope is approximate and be full of the whole image acquisition degree of depth, if image is eight sampling depths, sinusoidal peak-to-peak value should close in 200 to 256 scopes, the interference fringe middle column image of contrast Real-Time Monitoring, while guaranteeing that middle row image meets the demands, the position orientation relation of intense adjustment interferometer and measured lens, guarantee that the curve that the interference fringe middle column image of display in real time shows in interference fringe image region becomes less fluctuation change, maximum fluctuation change can not more than two summits or peak valley, static a period of time after adjustment, treat that interference fringe image is stable and can catch a width interference fringe image, as successive image process, the original image of face type inverting.
2. according to claim 1 single width carrier fringe pattern image quality Real-Time Monitoring method of adjustment, it is characterized in that, obtain a frame in step 3 to gather the middle row data of image and the circular of a middle column data and be, if the width of a two field picture is w, be highly h, so the array M of a frame monochrome image gradation data and available h*w represents, if h is even number, the line number of then required row data is h/2, if h is odd number, the line number of then required row data is (h+1)/2, if w is even number, the row number of then required column data are w/2, if w is odd number, the row number of then required column data are (w+1)/2.
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| CN108955575A (en) * | 2018-08-22 | 2018-12-07 | 江南大学 | A method of corrugated is accurately restored based on single width interference fringe |
| CN111527412A (en) * | 2019-09-27 | 2020-08-11 | 深圳市鼎阳科技股份有限公司 | High-refresh-rate waveform mapping method and digital oscilloscope |
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