CN1790095A - Automatic image focusing system and method - Google Patents
Automatic image focusing system and method Download PDFInfo
- Publication number
- CN1790095A CN1790095A CN200410077634.3A CN200410077634A CN1790095A CN 1790095 A CN1790095 A CN 1790095A CN 200410077634 A CN200410077634 A CN 200410077634A CN 1790095 A CN1790095 A CN 1790095A
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Abstract
The invention discloses an image self-focusing method and realization system, which comprises the following steps: providing user end computer with machine measurement and focusing control function for the detected object; supplying charge coupler and industrial optical lens to gather the continual image due to measuring the Z axle of machine; providing the image acquisition card to gain the continual image; supplying the control card to send order for controlling the Z axle motor to move within the named scale; sending the focusing order to the initiating system; obtaining the image of charge coupler; predisposing the obtained image; calculating the present image articulation; judging whether the Z axle reaches in the focusing scale or second focusing; calculating the focal point according to the articulation; driving Z axle motor to reach and output the position of focal point.
Description
[technical field]
The present invention relates to a kind of image measurement system and method, refer to the system and method for focusing automatically in a kind of image measurement process especially.
[background technology]
Office automation (Office Automation, OA) indispensable in the society of present data informationization, except the processing and storage that are used as great mass of data with computing machine, be used as the input media of data such as file, form and image by optical scanning device (Scanner), because of can effectively improving the efficient that data input is handled, so used in large quantities, the standard that becomes computing machine one of is equipped with.
Existing optical scanner is when the former contribution of scanning different specification size, reach by switching camera lens mechanism more than a group, the camera lens that switches to different multiplying when different size is with correspondence, can make focal length be projeced into just charge-coupled image sensor (Charged Coupled Device, CCD) on.Though it is identical that these camera lenses are adopted total optical path, and the mode with a relevant cooperation position is arranged in many camera lenses mechanism, it can correctly be imaged on the charge-coupled image sensor, yet, because this camera lens is a complex optics, it is in the error of grinding, can produce unavoidably in the process of processing a little, makes required total optical path of each camera lens blur-free imaging and focusing length or a little difference slightly.So, in the process that camera lens switches, its image just can't accurately image on charge-coupled image sensor, even and optical scanner a camera lens is only arranged, also the error of often processing or installing because of camera lens has influence on the degree of accuracy of lens focus imaging.
China national Department of Intellectual Property is that CN2321022Y, denomination of invention are the patent of " automatic focusing mechanism " in the notification number of Granted publication on the 26th May in 1999, this patent provides a kind of automatic focusing mechanism, be arranged on the optical scanning device, this device comprises: the camera lens location adjustment unit, that can adjust lens location can be adjusted the CCD location adjustment unit of charge-coupled device (CCD) position and the control module that this camera lens of a may command is located the action of adjustment unit and CCD location adjustment unit.When scanning machine when start is used, can answer required light path of lens imaging and focal length length to adjust automatically, camera lens and charge-coupled image sensor are moved to the appropriate location, make camera lens that target is accurately focused, imaged on the charge-coupled image sensor, and the resolution of optical scanning device is significantly improved.
But foregoing invention is to realize focusing based on the adjustment of hardware unit, do not realize the requirement of office automation, so needing to propose a kind of system and method can come the image measuring machine of placing object to be measured is controlled by the software program that is embedded in the computing machine, to reach automatic focus function, make that focusing mechanism is not only simple in structure, cost is low but also can guarantee the precision of focusing again.
[summary of the invention]
The object of the present invention is to provide a kind of image autofocus system.
Another object of the present invention is to provide a kind of image method of focusing automatically.
The present invention discloses a kind of image autofocus system, and this system comprises the user end computer that an image measuring machine and of placing object to be measured carries out the image focusing.One charge-coupled device (CCD) is installed on the described measurement platform Z axle, and is adorned an industrial optical lens, can gather continuous image by industrial optical lens and CCD in this CCD the place ahead.Described user end computer comprises a Frame Grabber and a control card, and described Frame Grabber links to each other with CCD by the image data line, is used to obtain the continuous image of CCD and industrial optical lens collection; Described control card links to each other with measurement board Z axle motor by another data line, is used for to Z axle motor sending controling instruction, moves in the appointed area to drive Z axle motor.Described connection Z axle motor is different from the data line that is connected Frame Grabber and CCD with the data line of control card.
Described user end computer also comprises following functional module: an input/output module, be used for obtaining continuous image to the user end computer that industrial optical lens and CCD gather and carry out analyzing and processing by Frame Grabber, drive the instruction that Z axle motor moves around in the appointed area by control card output, the focal position is exported on the interface of user end computer; One parameter setting module is used for setup parameter, comprise the zoning of setting image, set whether to filter, the set-up and calculated amount; One computing module, the height that is used to calculate image definition and pass through sharpness calculates focus; The interim storage module of one data is used to preserve the board Z shaft position of the definition values that calculates and this definition values correspondence; One judge module is used to judge whether the Z axle arrives desired location and judge whether to focusing for the second time, if the Z axle does not arrive desired location, then sends and drives Z axle motor and continue the instruction of moving, and transmits this instruction by control card and moves it to Z axle motor.Wherein computing module calculates sharpness according to the pixel value of image, and wherein the disposal route of pixel value is to adopt gradient method, and sharpness evaluation function is 4 field gray scale absolute value sum evaluation functions.
The present invention also discloses a kind of image method of focusing automatically, and this method comprises the steps: that (a) provides one to place the measurement board of object to be measured and the user end computer of a control focusing; (b) provide a charge-coupled device (CCD) and an industrial optical lens in measuring board Z axle motor, to gather the continuous image of object to be measured; (c) provide a Frame Grabber in user end computer, to obtain above-mentioned continuous image; (d) provide a control card in user end computer, in specified scope, move to send order control Z axle motor; (e) send the focusing order, with initialization system; (f) Frame Grabber obtains the continuous image of CCD output; (g) the above-mentioned continuous image that obtains of pre-service; (h) sharpness of calculating current image according to the pixel value and the sharpness evaluation function of image; (i) judge whether the Z axle arrives desired location, promptly focusing range if the Z axle does not arrive desired location, then drives the Z axle and continues to move, and obtains current image and returns step g; (j) judge whether to be focusing for the second time, if not focusing for the second time, then reassign the starting position by the height of sharpness, driving Z axle is got back to above-mentioned starting position of reassigning and is continued to move, and returns step g; (k) height by sharpness calculates focus, and drives Z axle motor arrival focal position; (l) focusing is finished in the output focal position.
Described pre-service comprises ephemeral data and the filtering image impurity that empties last calculating.
The present invention is by controlling measurement platform, determine that one is sought interval, mobile machine console Z axle moves up and down, in order to gathering continuous image with industrial optical lens and CCD, carry out the performance analysis image simultaneously, finally calculate the focal position, and mobile Z axle moves to the focal position, obtain distinct image.The present invention is simple in structure, and cost is low, can guarantee precision.
[description of drawings]
Fig. 1 is the hardware structure figure of image autofocus system of the present invention.
Fig. 2 is the functional block diagram of user end computer of the present invention.
Fig. 3 is the image of the present invention method flow diagram of focusing automatically.
[embodiment]
At first, as follows to the used terminological interpretation of the present invention:
CCD:Charged Coupled Device, charge-coupled device (CCD) or charge-coupled image sensor.
Consult shown in Figure 1ly, be the hardware structure figure of image autofocus system of the present invention.This image autofocus system comprises the board 19 of a user end computer 11 and a placement object.Wherein, also be useful on the device CCD16 that gathers continuous image on the Z axle of board 19, this CCD16 is equipped with industrial optical lens 18, and CCD16 focuses on image by this industrial optical lens 18.Described user end computer 11 is equipped with Frame Grabber 12, control card 13 and a data storage district 20.Wherein CCD16 links to each other with described Frame Grabber 12 by an image data line 14, and CCD16 will be sent to from the image electric signal that board obtains on the Frame Grabber 12 by this image data line 14; Described control card 13 links to each other with Z axle motor 17 by another different control signal data line 15, and these control signal data line 15 transfer control instructions drive Z axle motor 17 and move around in the zone of appointment; Described data storage district 20 is used to preserve the definition values and the pairing board Z of this definition values shaft position of the current image that calculates.
Consult shown in Figure 2ly, be the functional block diagram of user end computer of the present invention.This user end computer 11 comprises an input/output module 111, a parameter setting module 112, a computing module 113, the interim storage module 114 of data and a judge module 115.Input/output module 111 is used for obtaining the continuous image that industrial optical lens 18 and CCD gather by Frame Grabber 12, and is sent to user end computer 11 and carries out analyzing and processing, drive instruction that Z axle motors move around in the appointed area and the focal position is exported on the interface of user end computer 11 by control card 13 outputs.Parameter setting module 112 setup parameters, comprise the zoning of setting image, set whether to filter, the set-up and calculated amount, wherein calculated amount is big more, the focus that calculates is accurate more, speed is slow more; Otherwise focus is inaccurate more, and speed is fast more.The height that computing module 113 is used to calculate image definition and pass through sharpness calculates focus.The board Z shaft position that the interim storage module 114 of data is used for the definition values that will calculate and this definition values correspondence is stored in data storage area 20.Judge module 115 is used to judge whether Z axle 17 arrives desired location and judge whether to be focusing for the second time, if the Z axle does not arrive desired location, then send and drive the instruction that 17 continuation of Z axle motor are moved, transmit these instructions by control card 13 and move it for Z axle motor 17.
Consult shown in Figure 3ly, be the image of the present invention method flow diagram of focusing automatically.At first, send focusing order (step 300) by user end computer 11.The initialization focusing system, promptly set the position that some parameters and control board Z axle arrive user's setting, this position is to specify the focusing of a Position Approximate and appointment from calculating by the user, described setup parameter refer to set image the zoning, set and whether will filter and set-up and calculated amount etc., wherein calculated amount is big more, the focus that calculates is accurate more, and speed is slow more; Otherwise focus is inaccurate more, speed fast more (step S302).Driving Z axle motor 17 moves around in the zone of appointment, CCD16 and industrial optical lens 18 gathered the continuous image that Z axle motors 17 move, and input/output module 111 is input to (step S304) in the user end computer 11 by the digital picture electric signal of the continuous image that Frame Grabber 12 spreads out of CCD16.11 pairs of images that obtained of user end computer carry out pre-service, and this pre-service mainly is to empty last ephemeral data and the overanxious image impurity (step S306) that calculates.Sharpness according to the current image of calculated for pixel values of image, the disposal route of pixel value adopts gradient method, promptly the Grad of two adjacent pixels is big more, image is sharp-pointed more, the difference of B﹠W pixel is obvious more, used sharpness evaluation function is 4 field gray scale difference absolute value sum evaluation functions, and is as follows:
And the definition values that calculated and this are worth pairing board Z shaft position deposit (step S308) in the data storage area 20 in.Judge whether the Z axle arrives desired location, this desired location is meant the scope (mxm., a minimum) of focusing, and the moving range of Z axle is 0～150 (mm), and the general scope of setting focusing is 1～2 (mm) (step S310).If do not arrive desired location, then drive board Z axle and continue to move, obtain image again and return step S306 simultaneously, calculate once more; If arrival desired location, then judge whether to be focusing (step S312) for the second time again, if not focusing for the second time, then reassign the starting position and drive board Z axle and get back to this starting position by the height of sharpness, return step S306 and recomputate and obtain image and calculate once more; If focusing for the second time, then the height by sharpness calculates focus, drives the Z axle simultaneously and arrives focal position (step S314).Focusing finishes, in user end computer 11 output focal positions (step S316).
Claims (10)
1. image autofocus system, it comprises the user end computer that an image measuring machine and of placing object to be measured carries out the image focusing, it is characterized in that:
One charge-coupled device (CCD) is installed on the described measurement platform Z axle, and an industrial optical lens is adorned in this CCD the place ahead, can gather continuous image by industrial optical lens and CCD;
Described user end computer comprises a Frame Grabber and a control card, described Frame Grabber links to each other with CCD by the image data line, be used to obtain the continuous image of CCD and industrial optical lens collection, described control card links to each other with measurement board Z axle motor by another data line, be used for to Z axle motor sending controling instruction, move in the appointed area to drive Z axle motor.
2. image autofocus system as claimed in claim 1 is characterized in that, described connection Z axle motor is different from the data line that is connected Frame Grabber and CCD with the data line of control card.
3. image autofocus system as claimed in claim 1 is characterized in that, described user end computer comprises following functional module:
One input/output module, be used for obtaining continuous image to the user end computer that industrial optical lens and CCD gather and carry out analyzing and processing by Frame Grabber, drive the instruction that Z axle motor moves around in the appointed area by control card output, the focal position is exported on the interface of user end computer;
One parameter setting module is used for setup parameter, comprise the zoning of setting image, set whether to filter, the set-up and calculated amount;
One computing module, the height that is used to calculate image definition and pass through sharpness calculates focus;
The interim storage module of one data is used to preserve the board Z shaft position of the definition values that calculates and this definition values correspondence;
One judge module is used to judge whether the Z axle arrives desired location and judge whether to focusing for the second time, if the Z axle does not arrive desired location, then sends and drives Z axle motor and continue the instruction of moving, and transmits this instruction by control card and moves it to Z axle motor.
4. image autofocus system as claimed in claim 3, it is characterized in that, described computing module is according to the calculated for pixel values sharpness of image, and wherein the disposal route of pixel value is to adopt gradient method, and sharpness evaluation function is 4 field gray scale absolute value sum evaluation functions.
5. one kind is utilized the described system of claim 1 to carry out the image method of focusing automatically, it is characterized in that this method comprises the steps:
Send the focusing order, with initialization system;
Frame Grabber obtains the continuous image of CCD output;
The above-mentioned continuous image that obtains of pre-service;
The sharpness of calculating current image according to the pixel value and the sharpness evaluation function of image;
Judge whether the Z axle arrives desired location, i.e. focusing range;
Judge whether to be focusing for the second time;
Height by sharpness calculates focus, and drives Z axle motor arrival focal position;
Focusing is finished in the output focal position.
6. the image as claimed in claim 5 method of focusing automatically is characterized in that wherein the step initialization system also comprises the steps:
Set the zoning of image;
Whether set needs to filter;
The set-up and calculated amount;
Drive board Z axle and arrive initial position.
7. the image as claimed in claim 6 method of focusing automatically is characterized in that, described initial position is meant that driving the Z axle arrives predefined position, and this position is to specify the focusing of a Position Approximate and appointment from calculating by the user.
8. the image as claimed in claim 5 method of focusing automatically is characterized in that wherein the step of the above-mentioned continuous image that obtains of pre-service comprises:
Empty the last ephemeral data that calculates;
Filtering image impurity.
9. the image as claimed in claim 5 method of focusing automatically is characterized in that judge wherein whether the Z axle arrives desired location and also comprise step:
If the Z axle does not arrive desired location, then drive the Z axle and continue to move, obtain current image, and continue to handle the image that obtains again.
10. the image as claimed in claim 9 method of focusing automatically is characterized in that, wherein judges whether also to comprise step for focusing for the second time:
If not focusing for the second time, then reassign the starting position by the height of sharpness;
Driving Z axle is got back to above-mentioned starting position of reassigning and is continued to move;
Again obtain image and carry out focusing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100776343A CN100357779C (en) | 2004-12-17 | 2004-12-17 | Automatic image focusing system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100776343A CN100357779C (en) | 2004-12-17 | 2004-12-17 | Automatic image focusing system and method |
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| Publication Number | Publication Date |
|---|---|
| CN1790095A true CN1790095A (en) | 2006-06-21 |
| CN100357779C CN100357779C (en) | 2007-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100776343A Expired - Fee Related CN100357779C (en) | 2004-12-17 | 2004-12-17 | Automatic image focusing system and method |
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| JP3462006B2 (en) * | 1996-05-20 | 2003-11-05 | 株式会社ミツトヨ | Auto focus device |
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Granted publication date: 20071226 Termination date: 20181217 |