CN102778211B - Irregular-shaped spectacle frame superficial area detection device and method - Google Patents
Irregular-shaped spectacle frame superficial area detection device and method Download PDFInfo
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- CN102778211B CN102778211B CN201210244653.5A CN201210244653A CN102778211B CN 102778211 B CN102778211 B CN 102778211B CN 201210244653 A CN201210244653 A CN 201210244653A CN 102778211 B CN102778211 B CN 102778211B
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Abstract
The invention provides an irregular-shaped spectacle frame superficial area detection device which is characterized by comprising a box body, wherein a detection platform is arranged at the bottom of the box body, four groups of LED (light emitting diode) white light sources are symmetrically arranged on the left side and the right side of the detection platform, a high-precision CCD (charge coupled device) imaging system is arranged above the detection platform, a reflection inhibition film is arranged below the high-precision CCD imaging system through a lens, and a display and a controller are connected with the detection platform through a light source controller. The invention also provides an irregular-shaped spectacle frame superficial area detection method which is characterized by comprising the steps of: through acquiring images of two side surfaces of a spectacle frame and obtaining an image of a cross section of the spectacle frame, establishing a spectacle frame cross section image sequence with a unit pixel as a step length, calculating a sum of edge pixels, and figuring out a total area of the surface of the spectacle frame. According to the detection device and method, the superficial area of the spectacle frame is measured based on a machine vision system and an image processing technology; and the characteristics of convenience in detection, strong instantaneity and high accuracy are achieved.
Description
Technical field
The present invention relates to a kind of irregularly shaped spectacle frame surface area pick-up unit and detection method, belong to glasses technical field of quality detection.
Background technology
At present in China, the metal spectacle frame of low side generally take aldary, monel as main, only has the mirror holder product of a small amount of middle and high end to adopt titanium alloy, pure titanium or precious metal material to make.The spectacle frame product of being manufactured by noble metal is comparatively safe, but price is higher, a high-end consumer group for minority in society.For the ordinary populace consumer group, spectacle frame is mainly in take, low side monel or titanium alloys finished product be as main.Its manufacture is generally to take certain metal as ground, then electroplating processes is carried out in its surface, and electroplating technology can make product wear-resisting, anticorrosion, attractive in appearance.
In, the spectacle frame of low side adopts chromium plating or nickel plating technology more, this process costs is low, glossiness is good, just need not refine and can reach request for utilization.But chromium and nickel easily discharge the heavy metal element of harm environment and health, especially spectacle frame, long-term and skin contact, meet sweat again and corrode, liveness is higher, easily causes allergic, usually there are some consumers when wearing metal species mirror holder, the phenomenon that red swelling of the skin even festers can occur, mostly exceed standard relevantly with heavy metal burst size, severe one is the generation of possible carcinogenic disease.
Eyewear products is as mass consumption commodity, at a low price, the product of low-quality has huge market in consumption masses, because common consumer groups lack the consumption knowledge of science to eyewear products, so impel low side manufacturing enterprise to adopt relatively cheap technique and the material of cost, to reduce product price, improve sales volume and obtain existence.Product quality problem, in fact closely bound up with people's health, at present, in, nickel element burst size in low side metal species spectacle frame product, one of being evaluation spectacle frame quality is important, and particularly the nickel amount of separating out examination criteria, has become the topic that China's eyewear products quality field is paid close attention to.
Standardization body of European Union is reformulating the standard of eyewear products, considers that China is manufacture and the big export country of global eyewear products, and the official of this tissue links up with Chinese Industrial Standards (CIS) relevant departments just through various channels.At present in the world the nickel amount of separating out of metal spectacle frame is had to strict regulation and examination criteria, the underproof product of the nickel amount of separating out, does not allow to be sold to ultimate consumer.
In June, 1994, European Union has just promulgated 94/27/EC instruction, has stipulated the standard of the relevant nickel amount of separating out of product.In July, 1997, European Union has issued again 3 harmonized stndards, the clear and definite method that the nickel amount of separating out is carried out to qualitative analysis.ISO/TS24348 < < spectacle frame-to the simulation of metal and alloy frame wear and the detection method > > international standard of the nickel amount of separating out in 2007 formal promulgation, clear and definite regulation wherein: spectacle frame and wearer's skin directly and the metal of Long contact time and the alloy nickel amount of separating out partly, must not exceed 0.5 μ g/cm
2/ weekly, should the danger that may injure wearer's skin of being separated out by eyeglass or mirror holder material be down to minimum.
Along with scientific and technical high speed development and social progress, also more and more higher to the requirement of glasses manufacturing enterprise.According to the international examination criteria of glasses, need to detect the nickel amount of separating out of eyeglasses frame unit area, therefore need accurately to detect the surface area of spectacle frame member or some part.But due to the enterprise that difference is produced spectacle frame, for meeting the demand in market, the mirror holder shape of producing is varied, so that cannot adopt existing instrument or professional equipment accurately to detect its surface area.The method that detects at present mirror holder surface area mainly adopts the direct measuring method of the contacts such as vernier caliper, and because frame body is different, systematicness is not strong, and its detection is accurately often difficult to meet the demands.
Summary of the invention
The technical problem to be solved in the present invention is to provide pick-up unit and the detection method that a kind of energy is convenient, detect accurately and rapidly irregularly shaped spectacle frame surface area.
In order to solve above-mentioned first technical matters, technical scheme of the present invention is to provide a kind of irregularly shaped spectacle frame surface area pick-up unit, it is characterized in that: comprise casing, bottom half is provided with detection platform, the detection platform left and right sides is arranged with four groups of LED white light sources, detection platform top is provided with high precision CCD imaging system, and reflection suppresses film and is located at high precision CCD imaging system below by camera lens; Show and be connected with detection platform by light source controller with controller.
Preferably, described casing is enclosed construction.
Preferably, described high precision CCD imaging system is furnished with the standard calibrating template that resolution is 10um.
In order to solve above-mentioned second technical matters, technical scheme of the present invention is to provide a kind of irregularly shaped spectacle frame surface area detection method, it is characterized in that: the method is divided into following 8 steps:
Step 1: employing carries standard form high precision CCD imaging system is carried out to distortion correction and system calibrating, and according to the similarity of mirror holder shape, mirror holder is carried out to segmentation markers;
Step 2: detected mirror holder is placed in detection platform to fixing in advance surveyed area, gathers mirror holder two sides image by high precision CCD imaging system; Again mirror holder is carried out to physics intercepting by section, obtain respectively its cross sectional image, and by the video interface circuit of high precision CCD imaging system, the image of collection is sent into respectively to the memory wait showing with controller and process;
Step 3: each section of mirror holder two sides image gathering in step 2 carried out to filtering processing, eliminate the light reflecting background of introducing in imaging process, then by sub-pixel positioning method, detect respectively two edges of mirror holder two sides image; Take unit picture element as step-length, along mirror holder longitudinal direction, calculate the distance between image border, diverse location two sides, as long and wide in order to build irregular frame body xsect boundary rectangle sequence;
Step 4: utilize technique of image edge detection, each section of cross sectional image gathering in step 2 processed, detect its mirror holder xsect closed edge;
Step 5: to same section of mirror holder, the xsect closed edge that this section intercepted of take is elementary shape image, take unit picture element as step-length, and the boundary rectangle of opposite position is constraint, elementary shape image is expanded or corrodes operation, obtain this section of cross-sectional edge image sequence.
Step 6: successively all sections are processed by step 5, obtain all sections and take the cross-sectional edge image sequence that single pixel is step-length.Calculate the cross-sectional edge image sequence pixel of all sections, and add up, obtain whole mirror holder surface pixels sum.
Step 7: according to the mapping relations of pixel and real area, finally calculate mirror holder surface area.
Step 8: by showing that the liquid crystal display with controller shows mirror holder surface area result.
A kind of irregularly shaped spectacle frame surface area pick-up unit provided by the invention, based on Vision Builder for Automated Inspection and image processing techniques, adopt Embedded System Design method, centered by processor, image acquisition, processing, the section modeling of glasses support body and area are calculated and concentrate on one; Adopt the body structure of sealing as detection platform, shield extraneous light disturbance, in the inside of casing, adopt four groups of LED white light sources to form illuminator simultaneously, to eliminate illumination shade, by installing slow reflection additional, suppress film simultaneously, to suppress the reflection of metal framework surface light, accurately obtain mirror holder surface area; And by liquid crystal touch screen as human-computer interaction interface, realize mirror holder surface area and detect to control with result and show.
A kind of irregularly shaped spectacle frame surface area detection method provided by the invention, by machine vision and image processing techniques, extract the image of spectacle frame, similarity with mirror holder shape is carried out segmentation to mirror holder, the methods such as shape of cross section modeling, calculate mirror holder outside surface image elemental area, are converted into ask to take the summation of the cross-sectional edge pixel that unit picture element is step-length, and according to the mapping relations of single pixel and real area, realize the accurate measurement to mirror holder surface area.
A kind of irregularly shaped spectacle frame surface area pick-up unit provided by the invention and detection method, measure mirror holder surface area based on Vision Builder for Automated Inspection and image processing techniques, has feature easy to detect, real-time, accuracy is high.
Accompanying drawing explanation
Fig. 1 is a kind of irregularly shaped spectacle frame surface area pick-up unit schematic diagram provided by the invention;
Fig. 2 is the systematic functional structrue schematic diagram of a kind of irregularly shaped spectacle frame surface area pick-up unit provided by the invention;
Fig. 3 is the present embodiment Plays checkerboard image;
Fig. 4 is mirror holder modeling and surface area calculating schematic diagram in the present embodiment;
Description of reference numerals
1-casing; 2-high precision CCD imaging system; 3-camera lens; 4-reflection suppresses film; 5-LED white light source; 6-detection platform; 7-light source controller; 8-shows and controller; 9-cross-sectional edge; 10-external matrix.
Embodiment
For the present invention is become apparent, hereby with a preferred embodiment, and coordinate accompanying drawing to be described in detail below.
Fig. 1 is a kind of irregularly shaped spectacle frame surface area pick-up unit schematic diagram provided by the invention, described a kind of irregularly shaped spectacle frame surface area pick-up unit comprises the casing 1 of enclosed construction, casing 1 bottom is placed with detection platform 6, detection platform 6 left and right sides symmetries are equipped with four groups of LED white light sources 5, high precision CCD imaging system 2 is equipped with in detection platform 6 tops, and high precision CCD imaging system is furnished with the standard form that resolution is 10um.Reflection suppresses film 4 and is contained in high precision CCD imaging system 2 belows by camera lens 3; Show and be connected with detection platform 6 by light source controller 7 with controller 8.
In conjunction with Fig. 2, device be take Cortex-A8 processor as core, adopts Android operating system, mainly comprises peripheral interface circuit, capacitance touch liquid crystal display, LED white light source, digital CCD and corresponding optical system etc.In order to reduce in testing process, the impact of veiling glare on imaging system, accurately obtains mirror holder edge, adopts the body structure of sealing, shields extraneous light disturbance, adopts four groups of LED white light sources 5 to form illuminator, to eliminate illumination shade in the inside of casing 1; By installing reflection additional, suppress film 4 simultaneously, to suppress the reflection of metal framework surface light, accurately obtain mirror holder surface area.
A kind of irregularly shaped spectacle frame surface area detection method provided by the invention, first obtains spectacle frame two sides image, and detects its edge; Along mirror holder longitudinal direction, take unit picture element as step-length, calculate respectively the distance between image border, two sides, build irregular frame body xsect boundary rectangle sequence; According to the Changing Pattern of mirror holder shape, mirror holder is divided into and has similar some sections of shape, a cross sectional image of every section of intercepting, and detect its edge; The mirror holder boundary rectangle sequence of take is constraint, and the edge image in each section of cross section is primary image, operates to generate take the mirror holder cross-sectional edge image sequence that single pixel is step-length by dilation and erosion; To the edge sequence image obtaining, calculate each two field picture edge pixel number, and add up, obtain mirror holder surface pixels summation; By the corresponding relation of pixel and actual physical size, accurately calculate the surface area of irregular mirror holder.It is as follows that irregular spectacle frame surface area detects detailed implementation method:
Step 1: employing carries standard form high precision CCD imaging system 2 is carried out to distortion correction and system calibrating, and according to the similarity of mirror holder shape, mirror holder is carried out to segmentation markers, to obtain the corresponding actual physics area of the single pixel of imaging system.
The present invention adopts the bearing calibration of standard checkerboard image, and the distortion of high precision CCD imaging system 2 is proofreaied and correct.Standard checkerboard image as shown in Figure 3, at chessboard horizontal and vertical, there are respectively 8 and 12 chequered with black and white gridiron patterns, (horizontal 7 of 77 interior angle points have been formed, longitudinal 11), according to the position relationship information in the alive boundary of angle point in these coordinate plane and the position relationship information in corresponding image coordinate plane with it, we can obtain the distortion parameter of high precision CCD imaging system 2, thereby high precision CCD imaging system 2 is proofreaied and correct.
In trimming process, first standard checkerboard image is placed on to camera lens 3 times, make the plane at its place and the imaging plane preservation level of camera lens 3, and on the focal plane in camera lens 3, to obtain checkerboard image the most clearly; Obtain world's position coordinates of each interior angle point in this position checkerboard image; The standard checkerboard image obtaining is carried out to image processing, adopt the mode of fitting a straight line to obtain the whole interior focus of its pixel scale, and further determine on this basis other interior focus information of sub-pixel, obtain interior angle point in the positional information of image coordinate plane; By world's location coordinate information of interior angle point and image coordinate information corresponding in image, calculate the distortion correction parameter of camera; Finally, according to this correction parameter, carry out image rectification when the camera collection image.
Step 2: detected mirror holder is placed in detection platform 6 to fixing in advance surveyed area, gathers mirror holder two sides images by high precision CCD imaging system 2; Again mirror holder is carried out to physics intercepting by section, obtain respectively its cross sectional image, and by video interface circuit, the image of collection is sent into respectively to memory wait and process.
Step 3: each section of mirror holder two sides image gathering in step 2 carried out to filtering processing, eliminate the light reflecting background of introducing in imaging process, then by sub-pixel positioning method, detect respectively two edges of mirror holder two sides image; Take unit picture element as step-length, along mirror holder longitudinal direction, calculate the distance between image border, diverse location two sides, as long and wide in order to build irregular frame body xsect boundary rectangle sequence;
By geometry correction, can make real surface area that whole surveyed area diverse location detects target image pixel corresponding thereto keep the proportionate relationship of strict conformance.In addition, considering that imaging circumstances and internal circuit produce the reason of noise, often there is the noise of stochastic distribution, i.e. Gaussian noise in the mirror holder image of picked-up, in order to detect exactly mirror holder image lateral edge and cross-sectional edge, need to process the image denoising gathering.The present invention adopts the method for filtering to remove picture noise.Because frequency domain filtering is to remove noise by filtering the high frequency composition of image, the textural characteristics information that it also can lose image when removing noise, makes image blur, is unfavorable for the extraction of textural characteristics.In addition, frequency domain transform operation amount is larger, is difficult to realize real-time.The present invention, in implementation process, adopts improved average and median filtering algorithm to carry out pre-service to image, removes the noise of spectacle frame image.
Linear filtering shortcoming be to fall the low noise while also fuzzy the edge of whole image, particularly image and the grain details of image, therefore directly use mean filter to be unfavorable for the reservation of high frequency texture signal.Mean filter operation is successively the pixel value of operation neighborhood of pixel points to be got average and made image blurring, if had ready conditions, retain the value of original pixel point, only have when the value of pixel is greater than a certain threshold value than neighboring mean value, just get the value that neighboring mean value is this point, otherwise the value of this point remains unchanged.This disposal route, can make image not fuzzy, can remove noise again simultaneously.
Same, because the operation of median filtering algorithm is with certain sequence of operation, chooses in its filter window the value of intermediate pixel after sequence, and do not have positive connection with the value of original pixel point.If some characteristic dimension is less in image, after sequence, this object does not have in the middle of pixel comes, and after filtering, this object will be corroded and even disappears so.So adopt and first to set a threshold value, while only having the value of this point and the difference of neighborhood intermediate value to be greater than predefined threshold value, the intermediate value of just getting neighborhood, otherwise just retain the value of this point.Process like this, if certain pixel is noise, the intermediate value of it and neighborhood will differ larger, just it can be removed.If image information object, in neighborhood, also have the point of object itself, so the pixel value of the intermediate value of neighborhood and this point just can not differ too large, as long as suitable threshold value is set, just can retain the value of this point, thereby retain more image detail feature.
Step 4: utilize technique of image edge detection, each section of cross sectional image gathering in step 2 processed, detect its mirror holder xsect closed edge;
Step 5: to same section of mirror holder, the xsect closed edge that this section intercepted of take is elementary shape image, take unit picture element as step-length, and the boundary rectangle of opposite position is constraint, elementary shape image is expanded or corrodes operation, obtain this section of cross-sectional edge image sequence.
Step 6: successively all sections are processed by step 5, obtain all sections and take the cross-sectional edge image sequence that single pixel is step-length.Calculate the cross-sectional edge image sequence pixel of all sections, and add up, obtain whole mirror holder surface pixels sum.
Step 7: according to the mapping relations of pixel and real area, finally calculate mirror holder surface area.
Due to two side images of glasses support body of taking, all can only reflect the plane information of glasses support body single side face, can not reflect the three-dimensional shape of frame body completely.The present invention is directed to this problem, proposed a kind of method with glasses support body three-dimensional modeling, simulate the three-dimensional stereo model of spectacle frame.By calculating the surface pixels area of mirror holder three-dimensional stereo model, according to pixel corresponding actual physics area calculate the surface area of mirror holder.
The present invention adopts the method counter surface area that calculates the mirror holder surface pixels total area.In general, though the shape of mirror holder is of all kinds, there is segmentation similarity.To the mirror holder specify detecting, we take the similarity of frame body shape is criterion, is divided into some sections, each section of frame body, and its outer shape is substantially similar, and its cross-sectional edge image has similarity, and just its size dimension changes to some extent with axial direction.So detect the surface area of mirror holder, can adopt and take unit picture element as step-length, calculate the method for all mirror holder cross-sectional edge pixels.
Be illustrated in figure 4 the similar mirror holder section of a shape, this similar section of cross sectional image along all positions of y direction has similarity, and just area that its edge surrounds varies in size.If this section is at position x
1place carries out physics intercepting, and obtains mirror holder edge image and be expressed as s (x
1), at arbitrary position x of this section
i, its cross-sectional edge image can be expressed as s (x
i), s (x
i) be an irregular Closed Graph picture, here we use f (x
i) expression s (x
i) length at irregular image edge, asking radial position is x
i, be spaced apart a Δ x in a small amount
isurface area can be expressed as approx:
ΔS
i＝f(x
i)*Δx
i (1)
As by this section, it is radially divided into L minizone (L → ∞), ask this section of whole surface area, reality is exactly to Δ S
ifrom 0 to L, add up, be expressed as:
From the angle of infinitesimal analysis, the pixel surface area of desirable mirror holder can be regarded a series of irregular image rim circumference f (x) as at the integration of vertical footpath direction.That is:
S＝∫
Lf(x)dx (3)
Consider that obtained image is comprised of discrete view data, and step delta x radially
iwhile getting minimum value, during Ji Qu unit () pixel, it wants the size of test pixel surface area, and actual is exactly the image pixel number f (x of cross-sectional edge 9
i).Therefore, as Δ x
i=1 o'clock, definition pixel surface area summation was:
In formula (4) l be this section of image in radial height, unit is pixel, f (x
i) be position x
iplace's xsect mirror holder edge pixel.So the surface area that calculates mirror holder can be just step-length from radially take a pixel to set up model, obtains successively the number of the pixel at its xsect mirror holder edge, the summation that finally adds up, just can obtain mirror holder surface area sum of all pixels.
Image s (the x of each position xsect of mirror holder
i), are all s (x
1) similar image, its size is by boundary rectangle 10 restriction of this position, and by s (x
1) expanding or corroding operation obtains.After obtaining the surperficial elemental area of this section, utilize the previous demarcation to measuring system, i.e. the area of single pixel representative, gross area that just can this section surface of accurate Calculation mirror holder.Each section is all by similarly processing, and the surface area that each section obtained is added, and just can obtain the gross area of mirror holder.
Step 8: show mirror holder surface area result by liquid crystal display.
In implementation process, adopt following equipment:
(1) Cortex-A8 processor and peripheral processes circuit.Adopt the development board of Rreal210 model, its major parameter is: kernel is the Samsung hummingbird processor S5PV210 of processor Cortex-A8, dominant frequency is 1GHz, support NEON instruction, support 3D figure to accelerate (Power VR SGX540) and OpenGL-1.1 & 2.0, OpenVG1.0, support JPEG hardware compression, maximum 8192 * 8192 resolution of supporting, inside save as 4G bits DDR2.Support RGB 24Bit interface and the output of TVOUT video.
(2) digital CCD: the CMOS model of employing is OV3460,2048*1536 pixel, imaging region size is 3626 μ m x 2709 μ m, and pixel size is 1.75 μ m x 1.75 μ m, and it is per second that top speed can reach 30 frames.
(3) light source model: bar shaped white light source YBL-86-29, electric parameter 24v/8.6w, light intensity is controlled, physical dimension 86mm * 29mm * 18mm, LED row is 5, band diffusion disk.When environment temperature is 25 ℃, the continuous reliably working of 50% white light source brightness of take surpasses 30000 hours (damping capacity as 50% time), and can extend the serviceable life of light source while using frequent flashing control.
(4) optical lens: M3Z1228C-MP FA industry 300 everything element camera lenses, specification Format:2/3 "; Interface mode: C; Focal length (mm): 12～36 (variable); Aperture (F): 2.8～16C; Field angle (horizontal HOR) °: 41.0～13.6; Recently object image distance is from (M): 0.2; Effective aperture: front
27.2; After
12.1; Pre-filter screw thread
35.5 * 0.5; Physical dimension
41.6 * 53; Weight (g): 105.
(5) condenser type liquid crystal display touch display screen.Display screen adopts the TFTLCD that model is EK070TN937, and size is 7 cun, and resolution is 800*480, and interface signal is Parallel RGB, and display comparison degree is 500: 1 (Typ).
The nickel amount of separating out of metal spectacle frame has strict regulation and examination criteria, and the underproof product of the nickel amount of separating out, does not allow to be sold to ultimate consumer.Wherein the unit area nickel amount of separating out is important examination criteria, therefore how to detect quickly and accurately spectacle frame each several part surface area, is directly connected to the science of glasses quality assessment.The present invention utilizes image detecting technique, realization is measured fast, accurately to mirror holder surface area, contribute to spectacle frame quality to carry out in real time, analyze accurately and detect, China glasses manufacturing enterprise is controlled glasses quality, realizes glasses quality testing and appraisement system and world standard and integrate with and be significant.
Claims (3)
1. an irregularly shaped spectacle frame surface area detection method, it is characterized in that: adopt irregularly shaped spectacle frame surface area pick-up unit, irregularly shaped spectacle frame surface area pick-up unit comprises casing (1), casing (1) bottom is provided with detection platform (6), detection platform (6) left and right sides is arranged with four groups of LED white light sources (5), detection platform (6) top is provided with high precision CCD imaging system (2), and reflection suppresses film (4) and is located at high precision CCD imaging system (2) below by camera lens (3); Show and be connected with detection platform (6) by light source controller (7) with controller (8);
The method is divided into following 8 steps:
Step 1: employing carries standard form high precision CCD imaging system (2) is carried out to distortion correction and system calibrating, and according to the similarity of mirror holder shape, mirror holder is carried out to segmentation markers;
Step 2: detected mirror holder is placed in detection platform (6) to fixing in advance surveyed area, gathers mirror holder two sides image by high precision CCD imaging system (2); Again mirror holder is carried out to physics intercepting by section, obtain respectively its cross sectional image, and by the video interface circuit of high precision CCD imaging system (2), the image of collection is sent into respectively to the memory wait showing with controller (8) and process;
Step 3: each section of mirror holder two sides image gathering in step 2 carried out to filtering processing, eliminate the light reflecting background of introducing in imaging process, then by sub-pixel positioning method, detect respectively two edges of mirror holder two sides image; Take unit picture element as step-length, along mirror holder longitudinal direction, calculate the distance between image border, diverse location two sides, as long and wide in order to build irregular frame body xsect boundary rectangle sequence;
Step 4: utilize technique of image edge detection, each section of cross sectional image gathering in step 2 processed, detect its mirror holder xsect closed edge;
Step 5: to same section of mirror holder, the xsect closed edge that this section intercepted of take is elementary shape image, take unit picture element as step-length, and the boundary rectangle of opposite position is constraint, elementary shape image is expanded or corrodes operation, obtain this section of cross-sectional edge image sequence;
Step 6: successively all sections are processed by step 5, obtain all sections and take the cross-sectional edge image sequence that single pixel is step-length; Calculate the cross-sectional edge image sequence pixel of all sections, and add up, obtain whole mirror holder surface pixels sum;
Step 7: according to the mapping relations of pixel and real area, finally calculate mirror holder surface area;
Step 8: by showing that the liquid crystal display with controller (8) shows mirror holder surface area result.
2. a kind of irregularly shaped spectacle frame surface area detection method as claimed in claim 1, is characterized in that: described casing (1) is enclosed construction.
3. a kind of irregularly shaped spectacle frame surface area detection method as claimed in claim 1, is characterized in that: described high precision CCD imaging system (2) is furnished with the standard calibrating template that resolution is 10um.
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