CN101424514B - Band tape graduation on-line automatic detection system and method based on image processing - Google Patents

Abstract

The invention relates to a tape measure scale on-line automatic detecting system based on image processing and a method thereof; the system forms a main framework by a CCD video camera, two light source devices (including a direct annular epi-illuminating light source and a side LED light source), a computer equipped with an image capture card, an operating platform provided with a neck and a shielding device, and an alarm bell. The method acquires production line moving tape measure surface images by using the CCD video camera, judges whether the scale, marks and figures on the surface of the tape measure are completely accurate by the computer processing, and further monitors by using the alarm bell. The utility system can automatically check the printing quality of the surface of the tape measure in real time, and has high detecting precision and good accuracy.

Description

Band tape graduation on-line automatic monitoring system and method based on Flame Image Process

Technical field

The present invention relates to a kind of tape measure figure on-line automatic monitoring system and method, the special employing obtained the tape measure surface image and carried out Digital Image Processing and detect the tape measure quality, and be efficient, accurately, and the automaticity height.

Background technology

China is steel tape big producing country, produce per year above more than 1,000,000,000 meter, the production of steel tape is to be imprinted on the strain line of specified accuracy on the steel band continuously with the rolling template, because how odjective causes such as printing equipment are carried out quality testing to the steel tape printing accurately and are become important link in the tape measure production run.The quality testing means that present China is taked are also more original, and quality detection apparatus is simpler and cruder, mainly are to detect by artificial sampling, and labour intensity is big, the loss height, and accuracy of detection is low, and poor reliability can't write down testing result automatically.Along with development of science and technology, Computer Processing speed is fast, and the advantage that automaticity is high more and more is applied in the checkout equipment, and wherein computer digital image is treated as an important means of quality testing.

At first adopt CCD to obtain the surface image of product in the industrial processes, utilize computing machine that image is discerned then, conversion, cutting after the various Treatment Analysis such as separation, transports out the result at last, automatically product quality is detected according to the result.Utilize the product surface image to carry out quality detection technology at present and begun to be applied to during other products detect, for example utilize 6 ccd video cameras that the packaging quality of each face of cigarette case is detected automatically and based on the cotton knot and the magazine on-line detecting system of video.In the production run of tape measure, part technology has also begun to adopt Digital Image Processing to simplify workflow, utilizes two ccd video cameras that tape measure length is carried out robotization and detects.With mechanical arm or manually tape measure is aligned zero point, 2 cameras align respectively and require the length mark district, automatically detect mark lengths whether in error range with methods such as Flame Image Process, pattern-recognitions after the images acquired, improved detection speed and precision greatly.Yet because the complicacy on tape measure surface, tight tinyization of band tape graduation, and tape measure detects the high precision that requires rests on the primitive stage to the detection of tape measure surface printing quality always.

Summary of the invention

The object of the present invention is to provide a kind of automatically, accurately, band tape graduation on-line automatic monitoring system and method at a high speed based on Flame Image Process.The present invention utilizes the regularity of tape measure figure, adopts ccd video camera to obtain surface image and handles, and judges, thereby realizes onlinely, in real time tape measure surface printing quality is detected.

For achieving the above object, the utility model adopts following technical proposals:

A kind of band tape graduation on-line automatic monitoring system based on Flame Image Process, comprise a ccd video camera, a computing machine and a stream line operation platform that is equipped with image pick-up card, it is characterized in that: two tape measure draw-in grooves and a shield assembly that the guiding tape measure is housed on the described stream line operation platform table top, described ccd video camera is fixed on the shield assembly directly over the tape measure, the tape measure surface is aimed in the visual field, a direct ring-type falls to penetrating light source around being fixed on the described ccd video camera, a side led light source is fixed on the shield assembly of ccd video camera below side, and tape measure can pass from two draw-in grooves on the operating platform; Described computing machine is connected with described ccd video camera and is connected with the warning alarm bell by outlet terminal by its image pick-up card, is provided with the surface printing trace routine of a cover according to the compiling of tape measure surface characteristics in the computing machine; With different tape measure surface abstract be a group system parameter, obtain the tape measure surface image by ccd video camera, utilize computing machine the tape measure surface image to be carried out analyzing and processing by program compiler.

The effect of system's critical piece:

Directly ring-type falls to penetrating light source: ring-type falls to penetrating light source can be provided evenly, the illumination of low reflection.Light source is provided on the one hand the sealing photographed scene, can prevents that on the other hand uneven illumination from influencing picture quality.

The side led light source: because bubble may appear in the tape measure surface, thus utilize the side light source reflective by bubble, and then obtain bubble diagram by CCD and look like to analyze.

Tape measure draw-in groove: prevent because the tape measure material flexibility is strong, elongated, and the outside is involute and cause the deformation of tape measure amplitude, thereby influence photographs the effect on tape measure surface, and increase difficulty and the error that detects.

Shield assembly: because ccd video camera is for illumination sensitivity very, shielding can prevent the illuminated the way instability of image pixel of ambient light.

A kind of band tape graduation on-line automatic monitoring system and method based on Flame Image Process, adopt above-mentioned system to detect, it is characterized in that: earlier under the drive of thread band tape at travelling belt with specific uniform rate by the draw-in groove in the platform, entering in the ccd video camera visual field slowly then, the computing machine of process assembling image pick-up card is to the collection of image, treatment of picture, Feature Extraction, and the judgement of view data and control, final result is sent in the warning alarm bell by output device, thereby realize robotization, objective, contactless, high-precision on-line detecting system.

Computing machine is as follows to tape measure surface image handling procedure step:

1) pre-service:

(1) read in a two field picture,

(2) figure image intensifying,

(3) image binaryzation, color conversion,

(4) image filtering

2) the meter ruler scale detects,

3) meter ruler Digital Detecting,

4) foot detects.

Repeating step 1)～4), being implemented in the linear flow waterline detects.

System and method of the present invention is compared with existing tape measure surface inspecting method, has following conspicuous outstanding substantive distinguishing features and remarkable advantage:

1. use video camera as sensor, obtain the tape measure surface, really realized the robotization detection thereby replace naked eyes.

2. because CCD can be apart from shooting, thus can realize non-contact detection, thus prevent swiping tape measure surface.

3. use various image processing algorithms, the single-frame images in the image sequence is carried out scale and Digital Detecting.

4. has stronger adaptability.Abstract to different tape measures is one group of tape measure parameter, can adapt to different tape measures by simple modification environmental parameter and detect, and makes the range of application of system become wide.

5. accuracy of detection height, speed is fast, and real-time is good.Native system utilizes ccd video camera to obtain image, by Computer Analysis, handles and judgement, and all operations all is an automation process, thereby can realize in real time, fast, accurately detects judgement.

Description of drawings

Fig. 1 is the one-piece construction synoptic diagram of this practicality invention system.

Fig. 2 is the process flow diagram of the tape measure surface analysis determining program of Fig. 1 example.

Embodiment

Details are as follows in conjunction with the accompanying drawings for a preferred embodiment of the present invention:

Referring to Fig. 1, this is based on the band tape graduation on-line automatic monitoring system of Flame Image Process, comprise a ccd video camera 1, a computing machine 8 and a stream line operation platform 6 that is equipped with image pick-up card, two tape measure draw-in grooves 7 and a shield assembly 4 of guiding tape measure 5 are housed on described stream line operation platform 6 table tops, described ccd video camera 1 is fixed on the shield assembly 4 directly over the tape measure, the tape measure surface is aimed in the visual field, a direct ring-type falls to penetrating light source 2 around being fixed on the described ccd video camera 1, a side led light source 3 is fixed on the shield assembly 4 of ccd video camera below side, and tape measure 5 can pass from two draw-in grooves 7 on the operating platform 6; Described computing machine 8 is connected with described ccd video camera 1 and is connected with warning alarm bell 9 by outlet terminal by its image pick-up card, is provided with the surface printing trace routine of a cover according to the compiling of tape measure surface characteristics in the computing machine 8; With different tape measure surface abstract be a group system parameter, obtain the tape measure surface image by ccd video camera 1, utilize computing machine 8 the tape measure surface image to be carried out analyzing and processing by program compiler.

Referring to Fig. 2, the band tape graduation online automatic detection method based on Flame Image Process of present embodiment adopts said system to detect.Computer Image Processing is analyzed: in the Vision Builder for Automated Inspection, the treatment technology of visual information mainly depends on image processing method, comprises the image graph image intensifying,, level and smooth, edge sharpening is cut apart, feature extraction, contents such as image recognition and understanding.After these processing, the quality of output image improves, and is convenient to computing machine image is further analyzed, and handles and identification, judges.Computing machine is to tape measure surface image handling procedure step (as Fig. 2):

1) pre-service.

(1) system's ccd video camera is to gather in the mode of frame/field, in view of the requirement of product of production line quality (within 1/4 millimeter of the error, speed per second 5-6 rice), with video camera CCD hardware (resolution pixel 768*576, frame per second 100/ second) length that basis, system's ccd video camera single frames obtain tape measure is 10cm.

(2) figure image intensifying because the tape measure figure is intensive, must strengthen the pixel of needs.What native system adopted is the spatial domain enhancement techniques, utilizes the linear smoothing technology will need the scale that detects, and numeral strengthens.

(3) image binaryzation, the image that obtains from the colored CCD camera all is the RGB image, has blue (B) three compositions of red (R) green (G) to determine the color value of a point in the space.But these aberration are different from the sensation of human eye, even very little noise, perhaps the influence of illumination all can change the rgb value of position in the space.For these reasons, native system is converted into more stable HIS color space pattern, wherein H (tone), S (color saturation) and brightness (I) relatively with the rgb space pixel value.Conversion formula (suc as formula 1) is used H then, and S, I and given three threshold ratios are converted into black (needing to detect color) and (background color) two kinds of colors in vain with colour.Binaryzation has improved the contrast of image, thereby is convenient to next step detection and processing.

$\left\{\begin{array}{c}I=(R+G+B)/3;\\ H=\{90-\arctan (F/\sqrt{3})+(0,G>B;180,G<B)\}/360;\\ S=1-\min (R,G,B)/I;\end{array}\right.$ Formula 1

(4) image filtering, because the scale on tape measure surface is a vertical direction, pixel is based on vertical line, so native system has adopted the mean filter operator, wherein template (suc as formula R) has improved the effect of filtering.

$R=\left[\begin{array}{ccc}1& 3& 1\\ 1& 3& 1\\ 1& 3& 1\end{array}\right]$ $f\left(\mathrm{2,2}\right)=\frac{\underset{i=1}{\overset{i=3}{\mathrm{\&Sigma;}}}\underset{j=1}{\overset{j=3}{\mathrm{\&Sigma;}}}f(i,j)*k(i,j)}{\underset{i=1}{\overset{i=3}{\mathrm{\&Sigma;}}}\underset{j=1}{\overset{j=3}{\mathrm{\&Sigma;}}}k(i,j)}$ Wherein (i j) is the template weights to k.

2) scale detects.

The pattern on tape measure surface mainly contains by scale and numeral to be formed.The first half on tape measure surface is a foot standard, and the latter half is the meter ruler standard.It is that benchmark comes single frames to detect that native system detects with the 10cm meter ruler, thereby realizes continuous detecting fast.

Determine the single frames detection reference, in ccd image, find out former frame and detect end point (promptly long calibration points) behind the 10cm, according to the distribution characteristics of scale, detect scale one by one then.Because after CCD obtains image, scale distortions that can become, interruption is so CCD must allow such error, so native system adopts search pattern as shown below to search for.

With pixel reference point (being black) is starting point, order according to a-＞h begins to search for scale pixel (black) then, in a single day when searching scale pixel (for example f), stop search, basic point moves to new scale pixel (f), again search when search highly surpasses scale mark, illustrates that scale mark is complete.Same principle, and then can judge the integrality of 10cm scale mark.

3) Digital Detecting

When 1cm judges in search in system, determine the reference point of 1cm, search for then with the digital rectangular area of reference point as relative position, with the respective digital data of having deposited in the numerical data base carry out right, calculate matching degree at last, size according to matching degree and threshold value compares, the final integrality of judging numeral.

4) foot

The foot of the first half of standard tape measure detects according to the meter ruler relative position of the latter half determines sensing range, and scale is identical with the digital detection and the detection principle of meter ruler.

System obtains continuous single-frame images by ccd video camera, and through the single frames collection, single frames is handled, and single frames judges, thus realize to the tape measure surface in real time, efficient fast, robotization accurately detects.

Claims (2)

1. band tape graduation on-line automatic monitoring system based on Flame Image Process, comprise a ccd video camera (1), a computing machine (8) and a stream line operation platform (6) that is equipped with image pick-up card, it is characterized in that: two tape measure draw-in grooves (7) and a shield assembly (4) that guiding tape measure (5) is housed on described stream line operation platform (6) table top, described ccd video camera (1) is fixed on the shield assembly (4) directly over the tape measure, the tape measure surface is aimed in the visual field, a direct ring-type falls to penetrating light source (2) around being fixed on the described ccd video camera (1), a side led light source (3) is fixed on the shield assembly (4) of ccd video camera below side, and tape measure (5) can pass from last two draw-in grooves of operating platform (6) (7); Described computing machine (8) is connected with described ccd video camera (1) and is connected with warning alarm bell (9) by outlet terminal by its image pick-up card, is provided with the surface printing trace routine of a cover according to the compiling of tape measure surface characteristics in the computing machine (8); With different tape measure surface abstract be a group system parameter, obtain the tape measure surface image by ccd video camera (1), utilize computing machine (8) the tape measure surface image to be carried out analyzing and processing by program compiler.

2. band tape graduation online automatic detection method based on Flame Image Process, adopt the band tape graduation automatic checkout system based on Flame Image Process according to claim 1 to detect, it is characterized in that at first under the drive of thread band tape (5) at travelling belt with uniform rate by the tape measure draw-in groove (7) on the operating platform (6), entering in ccd video camera (1) visual field slowly then, the image of picked-up is imported computing machine (8) through image pick-up card, subsequently by the collection of computing machine (8) to image, treatment of picture, Feature Extraction, and the judgement of view data and control, net result is sent to warning alarm bell (9) by output device; Computing machine (8) is as follows to tape measure surface image handling procedure step:

A. pre-service:

I. read in a two field picture,

Ii. figure image intensifying,

Iii. image binaryzation, color conversion,

Iv. image filtering

B. the meter ruler scale detects,

C. meter ruler Digital Detecting,

D. foot detects;

Repeating step a～d is implemented in the linear flow waterline and detects.

Images