CN102829956A - Image detection method, image detection apparatus and image testing apparatus - Google Patents
Image detection method, image detection apparatus and image testing apparatus Download PDFInfo
- Publication number
- CN102829956A CN102829956A CN2012101998548A CN201210199854A CN102829956A CN 102829956 A CN102829956 A CN 102829956A CN 2012101998548 A CN2012101998548 A CN 2012101998548A CN 201210199854 A CN201210199854 A CN 201210199854A CN 102829956 A CN102829956 A CN 102829956A
- Authority
- CN
- China
- Prior art keywords
- mentioned
- image
- projector
- camera
- projected image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 43
- 238000012360 testing method Methods 0.000 title claims abstract description 10
- 238000012937 correction Methods 0.000 claims abstract description 61
- 230000003287 optical effect Effects 0.000 claims abstract description 61
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 27
- 238000005286 illumination Methods 0.000 claims description 12
- 230000015572 biosynthetic process Effects 0.000 claims description 10
- 238000007689 inspection Methods 0.000 description 23
- 230000004075 alteration Effects 0.000 description 19
- 238000010586 diagram Methods 0.000 description 10
- 239000004973 liquid crystal related substance Substances 0.000 description 7
- 238000003384 imaging method Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010191 image analysis Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000004807 localization Effects 0.000 description 3
- 208000004350 Strabismus Diseases 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000004304 visual acuity Effects 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Landscapes
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Projection Apparatus (AREA)
Abstract
The present invention relates to an image detection method, an image detection apparatus and an image testing apparatus. A black color, a white color and a determined pattern to form an alignment pattern, and monochromatic light is used to illuminate the alignment pattern by using a projector. Then a photographic apparatus is used to take photographs of the alignment pattern on an alignment surface, and positions of the alignment pattern are analyzed via an image processing apparatus according to image signals output by the photographic apparatus. A correction value of deformation of optical properties of the photographic apparatus is calculated according to a relative relationship between an actual alignment-pattern position obtained after analysis and the position of an ideal alignment-pattern position. The correction value is used to correct the image signals obtained from projected image of the detected object with the image projected by the projector, and the optical properties of the projected image are detected according to the corrected image signals. The photographic apparatus can be corrected according to the correction value of deformation of the optical properties of the photographic apparatus, and the optical properties of the projected images of the projectors can be accurately and excellently detected.
Description
Technical field
The present invention relates to detect from the projector image detecting method to the optical characteristics of the projected image of screen prjection, image detection device and image testing device.
Background technology
Projector makes light image according to the image information modulation light beam from light source irradiation, with this light image to screen prjection.If this screen is a reflection type screen, then can observe projected image from the face side of screen, if this screen is a transmission-type screen, then can observe projected image from the rear side of screen.
Characteristic as the quality of the projected image of judging projector has the distortion of projected image.The distortion of so-called this projected image is meant following state: shown in figure 12; Compare with the shape of the ideal projection image 101 that makes according to the for example image information of cancellate projecting figure (the imaginary drawing picture that the diagram dotted line is represented), be projected in the shape difference of the projected image 103 (the diagram solid line is represented) of the reality on the screen 102 from projector.The deformation reason of this projected image is relevant with the projection environment of the concavo-convex that kind on screen 102 surfaces, in addition, also constitutes relevant with projector.
Relation about the distortion of the formation of projector and projected image describes with reference to accompanying drawing.Figure 13 is the approximate three-dimensional map of formation of the projector of expression detected object.In the projector 200 shown in this figure; The light that penetrates from light source 201 arrives optical image formation panel 202; The assortment that the light that arrives forms panel 202 according to image information by optical image becomes the panel of pixel unit to reflect or sees through, and is modulated into the projected light of the dot image of pixel unit.The projected light of this dot image is projected on the screen 204 through projecting lens 203.In the projector with this component parts 200, influenced by the optical accuracy that precision, projecting lens are set each other between the above-mentioned component parts, the posture precision of each component parts etc., produce the projected image distortion.Especially, in the projector of the short short focus type of the distance from the projector to the screen, will be from the projector, image projection of projector projection to non-spherical reflector etc., its reflected light is projected to screen.The form accuracy of this non-spherical reflector self or precision is set error is arranged slightly, big distortion will take place in projected image.
Again, the projector of following that kind is arranged in projector: be called as liquid crystal three-plate type projector, the synthetic projected image that resolves into the RGB look makes coloured image, and this coloured image is carried out projection.In liquid crystal three-plate type projector 300 shown in Figure 14, the light from light source 301 irradiations is decomposed into three light paths by dichroic mirror 302,303, catoptron 304-306.The light that is decomposed forms panel 307-309 according to image information by each optical image of RGB and becomes by dot image light of all kinds.The dot image light of three look decomposition is synthetic by cross prism 310, and through the projecting lens unit 311 that is made up of a plurality of lens, projecting to does not have on the illustrated screen.And on the projected image of synthetic projector, the reason because of each optical system that skew and each color image are set between the component parts of optical system squints each other produces the color shift phenomenon.For example, shown in Figure 15 (a), the black of literal is represented the secondary colour of the light of the whole Essential colour of RGB, is desirable black literal.When making literal, when above-mentioned literal is synthesized,, produce color shift such shown in Figure 15 (c) because of each optical system of each color image squints each other according to each chrominance signal of RGB shown in Figure 15 (b).
As the distortion of the projected image of adjusting this projector or the method for color shift, the method for patent documentation 1 record is that people are known.The method of adjustment system of this patent documentation 1 is according to the image information of correction graph; Make projected image; Make the above-mentioned projector, image projection that makes to screen from projector, this projected image is photographed, resolve this photographs with camera; Ask for compensating value, the distortion or the color shift of adjustment projected image to projected image.This revisal amount is to be used for constituting because of projector and the distortion of the projected image that the reason of two aspects of the distortion composition of the optical characteristics of camera produces or the compensating value of color shift.In order to carry out the adjustment of the color shift of projected image accurately, must guarantee resolution to the dot image photography of pixel unit.For this reason, make camera near the screen side macrophotography as far as possible.But,, in limited camera coverage photography,, can not detect the distortion of projected image because of the distortion scale amplifying screen part zone.For example, when the broad range that relates to screen, projected image gently is out of shape occasion, only to the part zone photography of this screen, can not detect the distortion of above-mentioned projected image.Therefore,, detection punishment with screen is proposed for a plurality of for the distortion of the projected image that detects this broad range, the method for above-mentioned correction graph being photographed in each detection place, still, the problem that this method exists process number to increase.In order to address this problem, in the method for adjustment of above-mentioned patent documentation 1, carry high-resolution imaging apparatus at camera; With high resolving power big camera coverage is photographed; Can detect the projected image distortion in broad range, therefore, in the method for adjustment of above-mentioned patent documentation 1; Can detect the color shift of a plurality of points on the screen with a spot of camera quantity, can be low-cost and detected image at high speed.
But; In the method for the distortion of the adjustment projected image of above-mentioned patent documentation 1 or color shift; To the broad range of the screen occasion of photographing, because of carrying aberration, comprise the signal of the distortion composition of projected image in picture signal self with a camera sometimes at the lens of this camera.The aberration of lens has the distortion aberration, spherical aberration, and the frame aberration, astigmatism, chromatic aberation, especially, because of the distortion of frame parallax images is photographed.Again,, calculate the occasion of distortion, become big error at the projected image that detects projector because of the different phenomenon of different its distortion of dichroism of the image light of photography.Again; In the detection of the projected image of projector; Dichroism by the light of each projector irradiation is not identical, therefore, even camera is carried out the position adjustment at each projector; The aberration of the lens of each projector still exists, and can not improve the detection error that the aberration because of these lens causes.
No. 3853674 communique of [patent documentation 1] Jap.P.
Summary of the invention
The present invention puts forward in view of the above problems, and its purpose is, image detecting method, image detection device and the image testing device of detection of the optical characteristics of the projected image that can precision carries out projector well is provided.
To achieve these goals, the present invention proposes following technical scheme:
(1) a kind of image detecting method, image detection device comprises:
Camera according to the image information modulation light beam from light source irradiation, makes light image, by the projector of detected object above-mentioned light image is projected on the screen, to being photographed by the projected image of projection; And
Image processing apparatus is resolved from the picture signal of this camera output, calculates the distortion composition of the optical characteristics of projected image;
According to picture signal, detect the optical characteristics of projected image from this camera output;
With black and white and with deciding figure formation correction graph; The rectifying plane parts have the rectifying plane of said correction graph; By the above-mentioned rectifying plane of above-mentioned projector, by above-mentioned camera the correction graph of above-mentioned rectifying plane is photographed, through above-mentioned image processing apparatus with the above-mentioned rectifying plane parts of monochromation illumination; According to picture signal from above-mentioned camera output; Resolve the position of above-mentioned correction graph, the relativeness of the position of the position of the above-mentioned correction graph of the reality that obtains according to parsing and desirable above-mentioned correction graph is calculated the compensating value of distortion composition of the optical characteristics of above-mentioned camera;
By above-mentioned projector will according to the projector, image projection that generates with the image information of figure of fixed detection on screen; By above-mentioned camera above-mentioned projected image is photographed; From above-mentioned camera output image signal; The compensating value of the distortion composition of the optical characteristics of the above-mentioned camera that gets according to calculating, the above-mentioned picture signal of revisal detects the optical characteristics of above-mentioned projected image according to the picture signal of revisal.
(2) in the described image detecting method of technique scheme (1), it is characterized in that:
It is identical figure that above-mentioned correction graph uses figure with above-mentioned detection.
(3) in technique scheme (1) or (2) described image detecting method, it is characterized in that:
When using the above-mentioned projector of detected object to throw light on above-mentioned correction graph; By the optical illumination above-mentioned correction graph of projector with each Essential colour that forms coloured image; Respectively the correction graph of the above-mentioned rectifying plane of each Essential colour is photographed by above-mentioned camera; Calculate the compensating value of distortion composition of optical characteristics of the above-mentioned camera of above-mentioned each Essential colour respectively by above-mentioned image processing apparatus; When the above-mentioned projector by detected object will detect projector, image projection with figure to screen, detect with above-mentioned each Essential colour projection and to use figure, according to carrying out revisal with corresponding each compensating value of each Essential colour; With the relative position between the coordinate position of figure, the color shift that calculates projected image distributes from the detection that becomes corresponding relation of the projected image of each Essential colour.
(4) a kind of image detection device comprises:
Camera according to the image information modulation light beam from light source irradiation, makes light image, by the projector of detected object above-mentioned light image is projected on the screen, to being photographed by the projected image of projection; And
Image processing apparatus is resolved from the picture signal of this camera output, calculates the distortion composition of the optical characteristics of projected image;
According to picture signal, detect the optical characteristics of projected image from this camera output;
With black and white and with deciding figure formation correction graph, the rectifying plane parts have the rectifying plane of said correction graph, by the above-mentioned rectifying plane of above-mentioned projector with the above-mentioned rectifying plane parts of monochromation illumination, by above-mentioned camera above-mentioned rectifying plane are photographed;
Above-mentioned image processing apparatus is according to the picture signal from above-mentioned camera output; Resolve the position of above-mentioned correction graph; The relativeness of the position of the position of the above-mentioned correction graph of the reality that obtains according to parsing and desirable above-mentioned correction graph is calculated the compensating value of distortion composition of the optical characteristics of above-mentioned camera;
By above-mentioned projector according to fixed detection generate projected image with the image information of figure, replace with above-mentioned rectifying plane parts, be projected on the above-mentioned screen, above-mentioned camera is photographed to above-mentioned projected image;
Above-mentioned image processing apparatus is according to the compensating value of the distortion composition of the optical characteristics of calculating the above-mentioned camera that gets in advance, and revisal detects the optical characteristics of above-mentioned projected image from the picture signal of above-mentioned camera output according to the picture signal of revisal.
(5) in the described image detection device of technique scheme (4), it is characterized in that:
Above-mentioned camera is used the above-mentioned correction graph of optical illumination that is formed each Essential colour of coloured image by above-mentioned projector, respectively the correction graph of the above-mentioned rectifying plane of each Essential colour is photographed;
Above-mentioned image processing apparatus calculates the compensating value of distortion composition of optical characteristics of the above-mentioned camera of above-mentioned each Essential colour respectively;
Above-mentioned camera is when making that the above-mentioned projector projection of detected object detects the projected image with figure; Use figure with above-mentioned each Essential colour projection detection; According to carrying out revisal with corresponding each compensating value of each Essential colour; With the relative position between the coordinate position of figure, the color shift that calculates projected image distributes from the detection that becomes corresponding relation of the projected image of each Essential colour.
(6) a kind of image testing device is characterized in that:
Use the image detection device of technique scheme (4) or (5) record,, check the projected image quality according to the institute by the above-mentioned projector projection of detected object decide the photograph characteristic value of the projected image that gets of figure.
In the present invention, use the projector that detects usefulness as illumination, irradiation has the rectifying plane parts of the rectifying plane of correction graph, with camera this correction graph is photographed.And, calculate the compensating value of distortion composition of the optical characteristics of camera in advance through image processing means.Use this compensating value; For the projected image of the projector of the detected object picture signal that obtains of photographing being carried out revisal with camera; Even camera has optical characteristics distortion composition; Also can get rid of the distortion composition of the optical characteristics of camera from the picture signal that is obtained by projected image, the ability precision detects the optical characteristics of the projected image of projector well.
Effect of the present invention is described below:
According to the present invention, can obtain the effect of optical characteristics that precision detects the projected image of projector well.
Description of drawings
Fig. 1 is the skeleton diagram that the presentation video pick-up unit constitutes.
Fig. 2 is the planimetric map of expression correction graph one example.
Fig. 3 is another routine planimetric map of expression correction graph.
Fig. 4 is the process flow diagram that the distortion inspection of the projected image of expression example of the present invention is handled.
Fig. 5 representes that the projector projecting figure detects coordinate revisal summary.
Fig. 6 explains revisal computing method one example.
Fig. 7 is the planimetric map of the anamorphose status image of expression projector.
Fig. 8 is the process flow diagram that the distortion inspection of the projected image of expression another variation of example of the present invention is handled.
Projected image when Fig. 9 representes localization examination on the screen.
Projected image when Figure 10 representes the asperratio inspection on the screen.
Projected image when Figure 11 representes line bending inspection on the screen.
Figure 12 is the planimetric map of expression projected image distortion.
Figure 13 is the approximate three-dimensional map of formation of the projector of expression detected object.
Figure 14 is the skeleton diagram of the formation of expression liquid crystal three-plate type projector.
Figure 15 explains the color shift phenomenon of the projected image of projector.
Embodiment
Below, specify an example that is suitable for image detection device of the present invention with reference to accompanying drawing.In following example, though to inscape, kind, combination, the position, shape, quantity, configuration waits and has done various qualifications relatively,, these are only given an example, and the present invention is not limited thereto.
Fig. 1 is the skeleton diagram that the image detection device of expression example of the present invention constitutes.Image detection device 10 shown in this figure comprises the stationary installation 11 that the projector 20 of fixed test object is provided with; The screen 12 of projector 20 projected images; The camera 13 that the projected image that is projected in screen 12 is photographed; The image analysis means 14 that the picture signal that camera 13 is photographed is resolved, and can be arranged near the formation black and white before the screen 12 the rectifying plane parts 15 of fixed correction graph.Camera 13 is the general cameras that carry solid-state imager such as CCD camera.Again, the imaging apparatus of camera 13 is black and white imaging apparatuss, and there is no need is color image sensor or three-plate type imaging apparatus.If the black and white imaging apparatus has sensitivity to the long frequency band of all-wave of light, even one-board, with color image sensor relatively, can expect high resolving power and low cost.In the correction graph that rectifying plane parts 15 form, identical figure is uniformly-spaced to be configured on the rectifying plane, and information such as its graph position obtain as measured value through micrometric measurement in advance.Fig. 2 is correction graph one example of expression rectifying plane parts 15, and background colour is a black, and figure portion is concatenated to form by the checker pattern of white, and each intersection point coordinate becomes uniformly-spaced.Fig. 3 is another routine planimetric map of expression correction graph, is circle diagram shape, and background colour is a black, and the circular portion of figure portion is a white.Identical circle diagram shape is concatenated to form, and the center of circular portion becomes uniformly-spaced.
Below, the flow process that the distortion inspection of the projected image of example of the present invention is handled is described with reference to Fig. 4.First operation of optical aberration correcting of carrying out camera etc. at first, is described.First operation (step S101-S104) does not change the position relation of camera 13 and the screen 12 of Fig. 1, and short of change there is no need each enforcement from the Essential colour of the projected image of projector 20.With the projector 20 of detected object or or the projector of identical machine be set in stationary installation 11.Then, high-ranking officers front parts 15 are arranged near before the screen 12.Perhaps also can unload sub-screen 12, the rectifying plane parts are set.Screen 12 and rectifying plane parts 15 are set in advance, make, do not have problems such as the focal position is inconsistent at the optical surface of screen 12 and the rectifying plane of rectifying plane parts 15.Then, from projector the homogeneous view data of Essential colour is thrown light at the rectifying plane (step S101) of rectifying plane parts 15.Have again, make and do not inject from the light of other light source.The homogeneous view data of so-called Essential colour is meant the Essential colour of in the pattern colour of projector forms, using, and for example in RGB three-plate type liquid crystal projector, only shines R light, other G light, and B light is by shading fully.The rectifying plane of rectifying plane parts 15 forms with black and white pattern, and illumination light is the Essential colour of projector, therefore, at the light of screen 12 reflection only in the white portion reflection of the rectifying plane of rectifying plane parts 15.This reflected light becomes the dichroism that reflects projector same as before.Under this state, use the camera 13 of Fig. 1, to the rectifying plane of rectifying plane parts 15 photograph (step S102).According to picture signal from camera 13, by the image analysis means 14 of Fig. 1, resolve the graph position of the rectifying plane of rectifying plane parts 15, that is, detect the location fix (step S103) of check point.Then, use the measured value of the rectifying plane of rectifying plane parts 15, calculate the revisal deal with data (step S104) in the anamorphose of the camera of the chromatic aberation composition of lens Essential colour, that comprise camera 13 of the projector 20 of detected object.
At this, explain that with reference to Fig. 5 the projector projecting figure that uses correction graph detects the revisal summary of coordinate.In the figure, the relation of the coordinate 32 of the correct correction graph that calculates according to the coordinate 31 of detected correction graph with from the measured value imagination of actual measurement is carried out revisal with the coordinate 34 of coordinate 33 after revisal of detected projector figure.Fig. 6 representes this revisal computing method one example.In this revisal is calculated; The distance of the light a lamp graph position of calculating from each check point to projector is the ratio apart from summation from each check point of correction graph to the position that lights a lamp of projector relatively; Difference according to the coordinate of X, Building Y target and the ideal point of each check point; Carry out the position revisal, ask for the light a lamp location fix of figure of projector.Calculate through this revisal, detected projector figure coordinate is projected to the correct correction graph coordinate that imagination is set, therefore, and can be through camera revisal distortion composition.The desirable coordinate A ' of each point shown in this figure, B ', the data in advance of C ' is stored in storer.
More particularly, each symbolic significance and calculating as follows among Fig. 6:
A, B, C: the check point of correction graph
A ', B ', C ': the desirable coordinate of each point
P: the projector graph position of lighting a lamp
P ': the projector that the position the obtains revisal graph position of lighting a lamp
La, Lb, Lc: the distance of the check point and the figure of lighting a lamp
Ra＝1.0-La/(La+Lb+Lc)
Rb＝1.0-Lb/(La+Lb+Lc)
Rc＝1.0-Lc/(La+Lb+Lc)
ΔXa＝Xa’-Xa
ΔXb＝Xb’-Xb
ΔXc＝Xc’-Xc
ΔYa＝Ya’-Ya
ΔYb＝Yb’-Yb
ΔYc＝Yc’-Yc
Xp’＝Xp+ΔXa×Ra+ΔXb×Rb+ΔXc×Rc
Yp’＝Yp+ΔYa×Ra+ΔYb×Rb+ΔYc×Rc
Below; Second operation as the anamorphose inspection of key diagram 4; The projector 20 of the detected object of Fig. 1 is set in stationary installation 11, and the Essential colour of using with timing projects to location graphic the screen 12 (step S106) that switches from the rectifying plane parts from projector 20.This location graphic also uses Fig. 2 and the such correction graph of Fig. 3.But both there is no need must be consistent.Then, be projected in the image photography (step S107) of this screen 12, resolve this picture signal, the coordinate values of calculating location figure (step S108) with the image analysis means with 13 pairs of cameras.Coordinate values is used the revisal data that obtain in first operation, the error composition (step S109) of the aberration that the revisal camera chain has etc.And at Fig. 7 of anamorphose status image of expression projector, expression is with the coordinate 33 of the detected projector figure of shooting means of Fig. 1, and the coordinate 34 of the projector figure through above-mentioned correction method revisal.At the coordinate 34 of detected projector figure, anamorphose also comprises the lens aberration composition of shooting means, and is relative therewith, and it is carried out the revisal result, in the figure coordinate, becomes the distortion composition that causes as just the projector self of detected object.According to these two data, calculate as the rectilinearity of the straight line anamorphose characteristic quantity, that become because of each graphic block ennuple or the error of the multiplying power that the spacing between straight line forms etc., can check image distortion (step S110).Like this, can be used for the optical aberration correcting of the camera of deformation detection respectively in first operation, carry out deformation detection as the image quality characteristic of projector in second operation.
In image detection device as another variation of example of the present invention; The coloured image of pressing the projector of detected object forms look (if RGB; Of all kinds by R, G, B) implement the operation that the Essential colour of projector is only carried out; Relatively respectively form the location graphic error of look, the color shift amount of asking for the projected image universe of projector distributes.Specifically, in the three-plate type liquid crystal projector, three optical images that carry RGB form panel; Form image at each panel, therefore, be suitable for this example occasion; As shown in Figure 8, carry out above-mentioned first operation and above-mentioned second operation (step S201, step S202 respectively by R, G, B three looks; Step S203), carrying out location graphic detects.Then, from each graphic block scale value calculating color shift amount (step S204) of RGB, carry out the inspection (step S205) of color shift amount.
Below, image testing device is described, the quality of the projected image of the projector of the inspected object that inspection is obtained by above-mentioned image detection device.The actual projection checker pattern of this image testing device is obtained the coordinate of each intersection point by above-mentioned image detection device, inspection location, asperratio, crooked, the color shift of line.
At first, localization examination is described.At this, the location is meant the projected image position.Inspection is carried out after the projector with inspected object is arranged on assigned address.And the zoom function of use projector is carried out operations such as zoom, becomes the appointment projection size.The position of the projected image on the screen at this moment is the location.Projected image on screen when Fig. 9 representes localization examination.Solid line among this figure is to be projected in to be examined projecting figure 41 on the screen 40, and dotted line is a preferred view figure 42.The desirable coordinate values as the projecting figure assigned address of the relative correction face of preestablishing initial point is according to checking with the difference of the coordinate values of the projected image of reality.And, judge whether inspection object's position 43 and poor (Δ X, the Δ Y) of preferred view figure are below the specification value of appointment, position inspection.
Below, the asperratio inspection is described.At this, so-called asperratio is meant the aspect ratio of projected image.The projector of inspected object has the design load of the asperratio of projected image.The asperratio occasion that the tolerance of relative this design load is above, for example, the aspect ratio of projection literal is different with design load.For example, become and press the shape literal that collapses.So the inspection of asperratio is shown in figure 10, detects and be projected in longitudinal size LY that is examined projecting figure and the lateral dimension LX on the screen 40.And, calculate asperratio R=LY/LX, compare the inspection asperratio with the design load tolerance.
Below, the crooked inspection of line is described.In projected image, the figure that was straight line sometimes originally is with the case of bending projection.Especially, occasions such as the short focus projection device of lift-launch etc., non-spherical lens or catoptron, sometimes because of components accuracy or assembly precision reason, the projected image distortion.So, shown in figure 11 in the inspection of online bending, the free-throw line of each line that forms for checker pattern or all line carry out the crooked inspection of line.And, ask for the how index of degree of line bending that expression should be straight line originally.Specifically, shown in figure 11, be the basis with each intersection point coordinate of the checker pattern of shape being aligned, the straight line that forms with its starting point and end point relatively to each fulcrum coordinate, is asked for its vertical direction distance.Wherein, ask for respectively+maximal value of side and-side, its difference is made as index (amount of bow).Through relatively this amount of bow and specification value, the inspection line is crooked.
Below, the inspection of color shift is described.As above-mentioned shown in Figure 8, the coloured image of pressing the projector of detected object forms look and implements image detection, relatively respectively forms the location graphic error of look.Thus, ask for the color shift amount distribution of the projected image universe of projector.Specifically, especially in the three-plate type liquid crystal projector, carry three liquid crystal panels of RGB, form image, therefore, carry out location graphic by RGB three looks and detect with each panel.Then, from each graphic block scale value calculating color shift amount of RGB, carry out the color shift inspection.
Above-mentioned explanation is that the present invention implements an example, and the present invention has distinctive effect in following form.
[form A]
In the image detecting method of this example, as stated, during the detected image distortion; For the aberration composition that camera self has, use the projected image light of the projector of detected object, calculate compensating value; Therefore, no matter the dichroism of the projected image light of projector, correctly the aberration composition of the optical system of revisal camera; Even a small amount of camera also can be suitable for broader region, can detect the optical characteristics of projected image accurately.
[form B]
In form A, correction graph is identical figure with detecting the use figure.Thus, as stated, can calculate compensating value more simply for anamorphose.
[form C]
In form A or form B, with the optical illumination correction graph of each Essential colour that forms coloured image, respectively the correction graph of each Essential colour is photographed by camera, calculate the compensating value of distortion composition of optical characteristics of the camera of each Essential colour respectively.Thus, like above-mentioned example variation explanation, when detecting color shift; The aberration composition that has for camera chain uses each the corresponding projected image light of Essential colour with the coloured image of the projector of detected object, calculates compensating value respectively; Therefore; Can be no matter the dichroism of the projected image light of projector, the aberration composition of correct revisal camera chain can detect the optical characteristics of projected image accurately.
[form D]
In the image detection device of this example, as stated, during the detected image distortion; For the aberration composition that the photography means self have, use the projected image light of the projector of detected object, calculate compensating value; Therefore, can be no matter the dichroism of the projected image light of projector, correctly the aberration composition of the optical system of revisal photography means; Even a small amount of camera also can be suitable for broader region, can detect the optical characteristics of projected image accurately.
[form E]
In form D, with the optical illumination correction graph of each Essential colour that forms coloured image, respectively the correction graph of each Essential colour is photographed by camera, calculate the compensating value of distortion composition of optical characteristics of the photography means of each Essential colour respectively.Thus, like above-mentioned example variation explanation, when detecting color shift; The aberration composition that has for camera chain uses each the corresponding projected image light of Essential colour with the coloured image of the projector of detected object, calculates compensating value respectively; Therefore; Can be no matter the dichroism of the projected image light of projector, the aberration composition of correct revisal camera chain can detect the optical characteristics of projected image accurately.
[form F]
Use the image detection device of form D or form E, the institute by the projector projection of detected object is decided figure photograph and obtain projected image,, check the projected image quality according to the characteristic value of this projected image.Thus, as enforcement model deformation example is illustrated, can carry out the quality inspection of the image of projector projection with the characteristic value of projected image, for example the location; Asperratio, line is crooked, the inspection of color shift; Therefore, compare with visual examination, check result can be eliminated deviation.
Above with reference to description of drawings example of the present invention, but the present invention is not limited to above-mentioned example.In technological thought scope of the present invention, can do all changes, they all belong to protection scope of the present invention.
Claims (6)
1. image detecting method, image detection device comprises:
Camera according to the image information modulation light beam from light source irradiation, makes light image, by the projector of detected object above-mentioned light image is projected on the screen, to being photographed by the projected image of projection; And
Image processing apparatus is resolved from the picture signal of this camera output, calculates the distortion composition of the optical characteristics of projected image;
According to picture signal, detect the optical characteristics of projected image from this camera output;
With black and white and with deciding figure formation correction graph; The rectifying plane parts have the rectifying plane of said correction graph; By the above-mentioned rectifying plane of above-mentioned projector, by above-mentioned camera the correction graph of above-mentioned rectifying plane is photographed, through above-mentioned image processing apparatus with the above-mentioned rectifying plane parts of monochromation illumination; According to picture signal from above-mentioned camera output; Resolve the position of above-mentioned correction graph, the relativeness of the position of the position of the above-mentioned correction graph of the reality that obtains according to parsing and desirable above-mentioned correction graph is calculated the compensating value of distortion composition of the optical characteristics of above-mentioned camera;
By above-mentioned projector will according to the projector, image projection that generates with the image information of figure of fixed detection on screen; By above-mentioned camera above-mentioned projected image is photographed; From above-mentioned camera output image signal; The compensating value of the distortion composition of the optical characteristics of the above-mentioned camera that gets according to calculating, the above-mentioned picture signal of revisal detects the optical characteristics of above-mentioned projected image according to the picture signal of revisal.
2. image detecting method according to claim 1 is characterized in that:
It is identical figure that above-mentioned correction graph uses figure with above-mentioned detection.
3. image detecting method according to claim 1 and 2 is characterized in that:
When using the above-mentioned projector of detected object to throw light on above-mentioned correction graph; By the optical illumination above-mentioned correction graph of projector with each Essential colour that forms coloured image; Respectively the correction graph of the above-mentioned rectifying plane of each Essential colour is photographed by above-mentioned camera; Calculate the compensating value of distortion composition of optical characteristics of the above-mentioned camera of above-mentioned each Essential colour respectively by above-mentioned image processing apparatus; When the above-mentioned projector by detected object will detect projector, image projection with figure to screen, detect with above-mentioned each Essential colour projection and to use figure, according to carrying out revisal with corresponding each compensating value of each Essential colour; With the relative position between the coordinate position of figure, the color shift that calculates projected image distributes from the detection that becomes corresponding relation of the projected image of each Essential colour.
4. image detection device comprises:
Camera according to the image information modulation light beam from light source irradiation, makes light image, by the projector of detected object above-mentioned light image is projected on the screen, to being photographed by the projected image of projection; And
Image processing apparatus is resolved from the picture signal of this camera output, calculates the distortion composition of the optical characteristics of projected image;
According to picture signal, detect the optical characteristics of projected image from this camera output;
With black and white and with deciding figure formation correction graph, the rectifying plane parts have the rectifying plane of said correction graph, by the above-mentioned rectifying plane of above-mentioned projector with the above-mentioned rectifying plane parts of monochromation illumination, by above-mentioned camera above-mentioned rectifying plane are photographed;
Above-mentioned image processing apparatus is according to the picture signal from above-mentioned camera output; Resolve the position of above-mentioned correction graph; The relativeness of the position of the position of the above-mentioned correction graph of the reality that obtains according to parsing and desirable above-mentioned correction graph is calculated the compensating value of distortion composition of the optical characteristics of above-mentioned camera;
By above-mentioned projector according to fixed detection generate projected image with the image information of figure, replace with above-mentioned rectifying plane parts, be projected on the above-mentioned screen, above-mentioned camera is photographed to above-mentioned projected image;
Above-mentioned image processing apparatus is according to the compensating value of the distortion composition of the optical characteristics of calculating the above-mentioned camera that gets in advance, and revisal detects the optical characteristics of above-mentioned projected image from the picture signal of above-mentioned camera output according to the picture signal of revisal.
5. image detection device according to claim 4 is characterized in that:
Above-mentioned camera is used the above-mentioned correction graph of optical illumination that is formed each Essential colour of coloured image by above-mentioned projector, respectively the correction graph of the above-mentioned rectifying plane of each Essential colour is photographed;
Above-mentioned image processing apparatus calculates the compensating value of distortion composition of optical characteristics of the above-mentioned camera of above-mentioned each Essential colour respectively;
Above-mentioned camera is when making that the above-mentioned projector projection of detected object detects the projected image with figure; Use figure with above-mentioned each Essential colour projection detection; According to carrying out revisal with corresponding each compensating value of each Essential colour; With the relative position between the coordinate position of figure, the color shift that calculates projected image distributes from the detection that becomes corresponding relation of the projected image of each Essential colour.
6. image testing device is characterized in that:
Use the image detection device of claim 4 or 5 records,, check the projected image quality according to the institute by the above-mentioned projector projection of detected object decide the photograph characteristic value of the projected image that gets of figure.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011131185 | 2011-06-13 | ||
| JP2011-131185 | 2011-06-13 | ||
| JP2012086258A JP2013021674A (en) | 2011-06-13 | 2012-04-05 | Image measuring method, image measuring device and image inspection device |
| JP2012-086258 | 2012-04-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102829956A true CN102829956A (en) | 2012-12-19 |
| CN102829956B CN102829956B (en) | 2015-04-15 |
Family
ID=47333170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210199854.8A Expired - Fee Related CN102829956B (en) | 2011-06-13 | 2012-06-13 | Image detection method, image detection apparatus and image testing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102829956B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740035A (en) * | 2021-08-26 | 2021-12-03 | 歌尔光学科技有限公司 | Projection quality detection method, device, equipment and readable storage medium |
| WO2022247419A1 (en) * | 2021-05-25 | 2022-12-01 | 青岛海信激光显示股份有限公司 | Laser projection device and image correction system |
| WO2023071698A1 (en) * | 2021-10-29 | 2023-05-04 | 青岛海信激光显示股份有限公司 | Laser projection device, and dispersion correction method for projected image |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1845592A (en) * | 2005-04-06 | 2006-10-11 | 精工爱普生株式会社 | Projector trapezoidal correction |
| US20090115915A1 (en) * | 2006-08-09 | 2009-05-07 | Fotonation Vision Limited | Camera Based Feedback Loop Calibration of a Projection Device |
| JP2009200683A (en) * | 2008-02-20 | 2009-09-03 | Seiko Epson Corp | Image processing device, projector, and distortion correction method |
| CN101621701A (en) * | 2009-01-04 | 2010-01-06 | 四川川大智胜软件股份有限公司 | Correcting method of multiple projector display wall colors of arbitrary smooth curve screens independent of geometric correction |
| CN101631219A (en) * | 2008-07-18 | 2010-01-20 | 精工爱普生株式会社 | Image correcting apparatus, image correcting method, projector and projection system |
-
2012
- 2012-06-13 CN CN201210199854.8A patent/CN102829956B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1845592A (en) * | 2005-04-06 | 2006-10-11 | 精工爱普生株式会社 | Projector trapezoidal correction |
| US20090115915A1 (en) * | 2006-08-09 | 2009-05-07 | Fotonation Vision Limited | Camera Based Feedback Loop Calibration of a Projection Device |
| JP2009200683A (en) * | 2008-02-20 | 2009-09-03 | Seiko Epson Corp | Image processing device, projector, and distortion correction method |
| CN101631219A (en) * | 2008-07-18 | 2010-01-20 | 精工爱普生株式会社 | Image correcting apparatus, image correcting method, projector and projection system |
| CN101621701A (en) * | 2009-01-04 | 2010-01-06 | 四川川大智胜软件股份有限公司 | Correcting method of multiple projector display wall colors of arbitrary smooth curve screens independent of geometric correction |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022247419A1 (en) * | 2021-05-25 | 2022-12-01 | 青岛海信激光显示股份有限公司 | Laser projection device and image correction system |
| CN113740035A (en) * | 2021-08-26 | 2021-12-03 | 歌尔光学科技有限公司 | Projection quality detection method, device, equipment and readable storage medium |
| WO2023071698A1 (en) * | 2021-10-29 | 2023-05-04 | 青岛海信激光显示股份有限公司 | Laser projection device, and dispersion correction method for projected image |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102829956B (en) | 2015-04-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI484283B (en) | Image measurement method, image measurement apparatus and image inspection apparatus | |
| JP3654220B2 (en) | Lens inspection device | |
| US6989894B2 (en) | Lens evaluation method and lens-evaluating apparatus | |
| US20140160267A1 (en) | Image Pickup Apparatus | |
| KR20070028231A (en) | Scintillation measuring method of display device and scintillation measuring device | |
| US6760096B2 (en) | Lens-evaluating method and lens-evaluating apparatus | |
| US10444162B2 (en) | Method of testing an object and apparatus for performing the same | |
| CN109978960A (en) | Based on photogrammetric high-precision screen-camera pose scaling method | |
| JP2014035261A (en) | Information processing method, information processor, program, imaging apparatus, inspection method, inspection device, and method of manufacturing substrate | |
| CN102829956B (en) | Image detection method, image detection apparatus and image testing apparatus | |
| US7834996B2 (en) | Inspection apparatus and method | |
| US20080279458A1 (en) | Imaging system for shape measurement of partially-specular object and method thereof | |
| CN108848358B (en) | Method and device for correcting color convergence errors | |
| CN113596441B (en) | Optical axis adjusting device, method, system and readable storage medium | |
| CN106814547B (en) | A kind of detecting and correcting device and survey calibration method | |
| CN111982025A (en) | Point cloud data acquisition method and system for mold detection | |
| JP2011090166A (en) | Stereo imaging apparatus | |
| KR101530371B1 (en) | Pico projector | |
| US11825070B1 (en) | Intrinsic parameter calibration system | |
| CN214333663U (en) | 2D and 3D combined high-precision vision device | |
| KR101155213B1 (en) | Flat-field correction method for two-dimensional optical inspection | |
| CN100552522C (en) | Photometry apparatus and camera | |
| JP2005114683A (en) | Lens misregistration detection method and lens misregistration detecting device | |
| KR101000855B1 (en) | Height measuring apparatus of an object to be measured | |
| JPH05288638A (en) | Two-dimensional luminous intensity distribution measuring apparatus for liquid crystal display panel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150415 |