CN102829956B - 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
- CN102829956B CN102829956B CN201210199854.8A CN201210199854A CN102829956B CN 102829956 B CN102829956 B CN 102829956B CN 201210199854 A CN201210199854 A CN 201210199854A CN 102829956 B CN102829956 B CN 102829956B
- Authority
- CN
- China
- Prior art keywords
- mentioned
- image
- projector
- camera
- projected
- 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.)
- Active
Links
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 image detecting method, image detection device and the image testing device of the optical characteristics of the projected image detected from projector to screen prjection.
Background technology
Projector, according to the light beam of modulate image information from light source irradiation, is made light image, by this light image to screen prjection.If this screen is reflection type screen, then projected image can be observed from the face side of screen, if this screen is through type screen, then projected image can be observed from the rear side of screen.
As the characteristic of quality of projected image judging projector, there is the distortion of projected image.The distortion of this projected image so-called refers to following state: as shown in figure 12, compared with the shape of the desirable projected image 101 (illustrating the imaginary drawing picture that dotted line represents) be made according to the image information of such as cancellate projecting figure, different from the shape of the projected image 103 (diagram solid line represents) of projector projection reality on the screen 102.The reason of the distortion of this projected image is relevant with the concavo-convex projection environment like that on screen 102 surface, in addition, also forms relevant with projector.
About the relation of the formation of projector and the distortion of projected image, be described with reference to accompanying drawing.Figure 13 is the approximate three-dimensional map of the formation of the projector representing detected object.In the projector 200 shown in this figure, the light penetrated from light source 201 arrives optical image formation panel 202, arrive light is formed by optical image according to image information the assortment pixel unit of panel 202 panel reflect or through, be modulated into the projected light of the dot image of pixel unit.The projected light of this dot image is projected on screen 204 by projecting lens 203.In the projector 200 with this component parts, by between above-mentioned component parts precision is set mutually, the optical accuracy of projecting lens, the posture precision etc. of each component parts affect, and produces projected image distortion.Especially, in the projector of the short short focus type of the distance from projector to screen, by the projector, image projection that projects from projector to non-spherical reflector etc., by its project reflection light to screen.The form accuracy of this non-spherical reflector self or arrange precision slightly error, will there is large distortion in projected image.
Again, have following such projector in projector: be called as liquid crystal three-panel projection device, the projected image of RGB look is resolved in synthesis, is made coloured image, is projected by this coloured image.In the three-panel projection of liquid crystal shown in Figure 14 device 300, from the light that light source 301 irradiates, by dichroic mirror 302,303, catoptron 304-306 is decomposed into three light paths.The light be decomposed forms panel 307-309 according to image information by each optical image of RGB and becomes dot image light by colors.The dot image light of three look decomposition is synthesized by cross prism 310, by the projecting lens unit 311 be made up of multiple lens, projects on not shown screen.Further, on the projected image of the projector of synthesis, because of optical system component parts between the reason that skew and each optical system of each color image offset from each other is set, produce color shift phenomenon.Such as, shown in Figure 15 (a), the black of word represents the secondary colour of the light of the whole Essential colour of RGB, is desirable black word.When each chrominance signal of the RGB according to Figure 15 (b) is made word, when synthesizing above-mentioned word, because each optical system of each color image offsets from each other, produce color shift such shown in Figure 15 (c).
As the distortion of projected image or the method for color shift of this projector of adjustment, the method that patent documentation 1 is recorded is known by people.The method of adjustment system of this patent documentation 1 is according to the image information of correction graph, be made projected image, make the above-mentioned projector, image projection be made to screen from projector, with camera, this projected image is photographed, resolve this photographs, ask for the compensating value to projected image, the distortion of adjustment projected image or color shift.This correction amount be for because of projector form and camera optical characteristics distortion composition two aspects reason produce the distortion of projected image or the compensating value of color shift.In order to carry out the adjustment of the color shift of projected image accurately, must photograph to the dot image of pixel unit, guaranteeing resolution.For this reason, make camera near screen side macrophotography as far as possible.But, in amplification screen part region, in limited camera coverage photography, because of distortion scale, the distortion of projected image can not be detected.Such as, when relating to the broad range of screen, projected image is gently out of shape occasion, only to a part of region photography of this screen, can not detect the distortion of above-mentioned projected image.Therefore, in order to detect the distortion of the projected image of this broad range, propose by the detection of screen punishment for multiple, in the method that each detection place is photographed to above-mentioned correction graph, but there is the problem that process number increases in the method.In order to solve this problem, in the method for adjustment of above-mentioned patent documentation 1, high-resolution imaging apparatus is carried at camera, with high resolving power, large camera coverage is photographed, projected image distortion can be detected, therefore, in the method for adjustment of above-mentioned patent documentation 1 in broad range, the color shift of multiple point on screen can be detected with a small amount of camera quantity, can low cost and detected image at high speed.
But, in the distortion of adjustment projected image or the method for color shift of above-mentioned patent documentation 1, with a camera, photography occasion being carried out to the broad range of screen, sometimes because being mounted in the aberration of the lens of this camera, comprising the signal of the distortion composition of projected image in picture signal self.The aberration of lens has distortion aberration, spherical aberration, frame aberration, astigmatism, chromatic aberation, especially, because the distortion of frame parallax images is photographed.Again, because different its of dichroism of the image light of photography is out of shape different phenomenons, calculates the occasion of distortion at the projected image detecting projector, become large error.Again, in the detection of the projected image of projector, the dichroism of the light irradiated by each projector is not identical, therefore, even if carry out position adjustment at each projector to camera, the aberration of the lens of each projector still exists, and can not improve the metrical error that the aberration because of these lens causes.
[patent documentation 1] Jap.P. No. 3853674 publication
Summary of the invention
The present invention puts forward in view of the above problems, its object is to, and provides energy precision to carry out image detecting method, image detection device and the image testing device of the detection of the optical characteristics of the projected image of projector well.
To achieve these goals, the present invention proposes following technical scheme:
(1) image detecting method, image detection device comprises:
Camera, according to the light beam of modulate image information from light source irradiation, is made light image, is projected on screen, photographs to the projected image be projected by the projector of detected object by above-mentioned light image; And
Image processing apparatus, resolves the picture signal exported from this camera, calculates the distortion composition of the optical characteristics of projected image;
According to the picture signal exported from this camera, detect the optical characteristics of projected image;
With black and white and with determined figure formation correction graph, rectifying plane parts have the rectifying plane of described correction graph, by the above-mentioned rectifying plane of above-mentioned projector monochromation illumination above-mentioned rectifying plane parts, photographed by the correction graph of above-mentioned camera to above-mentioned rectifying plane, by above-mentioned image processing apparatus, according to the picture signal exported from above-mentioned camera, resolve the position of above-mentioned correction graph, according to resolving the position of above-mentioned correction graph of reality and the relativeness of the position of desirable above-mentioned correction graph that obtain, calculate the compensating value of the distortion composition of the optical characteristics of above-mentioned camera,
By above-mentioned projector by the projector, image projection that generates according to the image information of fixed detection figure on screen, by above-mentioned camera, above-mentioned projected image is photographed, from above-mentioned camera output image signal, according to the compensating value of the distortion composition of the optical characteristics of calculated above-mentioned camera, the above-mentioned picture signal of correction, detects the optical characteristics of above-mentioned projected image according to the picture signal of correction.
(2) in the image detecting method described in technique scheme (1), it is characterized in that:
Above-mentioned correction graph and above-mentioned detection figure are identical figure.
(3) in the image detecting method described in technique scheme (1) or (2), it is characterized in that:
Use the above-mentioned projector of detected object throw light on above-mentioned correction graph time, the above-mentioned correction graph of optical illumination of each Essential colour of coloured image is formed by projector, respectively the correction graph of the above-mentioned rectifying plane of each Essential colour is photographed by above-mentioned camera, the compensating value of the distortion composition of the optical characteristics of the above-mentioned camera of above-mentioned each Essential colour is calculated respectively by above-mentioned image processing apparatus, when the above-mentioned projector by detected object by the projector, image projection of detection figure to screen time, with above-mentioned each Essential colour projection detection figure, correction is carried out according to each compensating value corresponding with each Essential colour, relative position between the coordinate position becoming the detection figure of corresponding relation of the projected image of each Essential colour, calculate the color shift distribution of projected image.
(4) image detection device, comprising:
Camera, according to the light beam of modulate image information from light source irradiation, is made light image, is projected on screen, photographs to the projected image be projected by the projector of detected object by above-mentioned light image; And
Image processing apparatus, resolves the picture signal exported from this camera, calculates the distortion composition of the optical characteristics of projected image;
According to the picture signal exported from this camera, detect the optical characteristics of projected image;
With black and white and with determined figure formation correction graph, rectifying plane parts have the rectifying plane of described correction graph, by the above-mentioned rectifying plane of above-mentioned projector monochromation illumination above-mentioned rectifying plane parts, are photographed to above-mentioned rectifying plane by above-mentioned camera;
Above-mentioned image processing apparatus is according to the picture signal exported from above-mentioned camera, resolve the position of above-mentioned correction graph, according to resolving the position of above-mentioned correction graph of reality and the relativeness of the position of desirable above-mentioned correction graph that obtain, calculate the compensating value of the distortion composition of the optical characteristics of above-mentioned camera;
Generate projected image by above-mentioned projector according to the image information of fixed detection figure, replace with above-mentioned rectifying plane parts, be projected on above-mentioned screen, above-mentioned camera is photographed to above-mentioned projected image;
The compensating value of the distortion composition of the optical characteristics of the above-mentioned camera that above-mentioned image processing apparatus obtains according to precalculating, the picture signal that correction exports from above-mentioned camera, detects the optical characteristics of above-mentioned projected image according to the picture signal of correction.
(5) in the image detection device described in technique scheme (4), it is characterized in that:
The above-mentioned camera above-mentioned correction graph of optical illumination of each Essential colour being formed coloured image by above-mentioned projector, photographs to the correction graph of the above-mentioned rectifying plane of each Essential colour respectively;
Above-mentioned image processing apparatus calculates the compensating value of the distortion composition of the optical characteristics of the above-mentioned camera of above-mentioned each Essential colour respectively;
Above-mentioned camera is when making the projected image of above-mentioned projector projection detection figure of detected object, with above-mentioned each Essential colour projection detection figure, correction is carried out according to each compensating value corresponding with each Essential colour, relative position between the coordinate position becoming the detection figure of corresponding relation of the projected image of each Essential colour, calculates the color shift distribution of projected image.
(6) image testing device, is characterized in that:
Use technique scheme (4) or (5) image detection device recorded, determine figure photography according to the institute projected to the above-mentioned projector by detected object and the characteristic value of projected image that obtains, inspection projected image quality.
In the present invention, use the projector detected as illumination, irradiate the rectifying plane parts with the rectifying plane of correction graph, with camera, this correction graph is photographed.Further, the compensating value of the distortion composition of the optical characteristics of camera is precalculated by image processing means.Use this compensating value, correction is carried out for the picture signal obtained of photographing with the projected image of camera to the projector of detected object, even if camera has optical characteristics distortion composition, also can get rid of the distortion composition of the optical characteristics of camera from the picture signal obtained by projected image, energy precision detects the optical characteristics of the projected image of projector well.
The following describes effect of the present invention:
According to the present invention, the effect that precision detects the optical characteristics of the projected image of projector well can be obtained.
Accompanying drawing explanation
Fig. 1 is the skeleton diagram representing that image detection device is formed.
Fig. 2 is the planimetric map representing correction graph one example.
Fig. 3 is the planimetric map representing another example of correction graph.
Fig. 4 is the process flow diagram of the Deformation checking process of the projected image representing the invention process form.
Fig. 5 represents that projector projecting figure detects coordinate correction summary.
Fig. 6 illustrates correction computing method one example.
Fig. 7 is the planimetric map of the anamorphose status image representing projector.
Fig. 8 is the process flow diagram of the Deformation checking process of the projected image representing another variation of the invention process form.
Projected image when Fig. 9 represents localization examination on screen.
Projected image when Figure 10 represents that asperratio checks on screen.
Projected image when Figure 11 represents that line bends inspection on screen.
Figure 12 is the planimetric map representing that projected image is out of shape.
Figure 13 is the approximate three-dimensional map of the formation of the projector representing detected object.
Figure 14 is the skeleton diagram of the formation representing liquid crystal three-panel projection device.
Figure 15 illustrates the color shift phenomenon of the projected image of projector.
Embodiment
Below, the example being suitable for image detection device of the present invention is described in detail with reference to accompanying drawing.In following example, although to inscape, kind, combination, position, shape, quantity, relative configuration etc. has done various restriction, these only exemplify, and the present invention is not limited thereto.
Fig. 1 is the skeleton diagram representing that the image detection device of the invention process form is formed.The stationary installation 11 that the projector 20 that image detection device 10 shown in this figure comprises fixed test object is arranged, the screen 12 of projector 20 projected image, to the camera 13 that the projected image being projected in screen 12 is photographed, the image analysis means 14 that the picture signal of photographing to camera 13 is resolved, and the rectifying plane parts 15 of fixed correction graph that can be arranged on the formation black and white before near screen 12.Camera 13 is the general cameras carrying the solid-state imagers such as CCD camera.Again, the imaging apparatus of camera 13 is black and white imaging apparatuss, there is no need to be color image sensor or three-plate type imaging apparatus.If black and white imaging apparatus, to the full wavelength band of light, there is sensitivity, even one-board, compare with color image sensor, high resolving power and low cost can be expected.In the correction graph that rectifying plane parts 15 are formed, identical figure is to be configured on rectifying plane at equal intervals, and the information such as its graph position are obtained as measured value by micrometric measurement in advance.Fig. 2 is correction graph one example representing rectifying plane parts 15, and background colour is black, and figure portion is concatenated to form by the checker pattern of white, and each intersection point coordinate becomes at equal intervals.Fig. 3 is the planimetric map representing another example of correction graph, and be circle diagram shape, background colour is black, and the circular portion in figure portion is white.Identical circle diagram shape is concatenated to form, and the center of circular portion becomes at equal intervals.
Below, the flow process of the Deformation checking process of the projected image of the invention process form is described with reference to Fig. 4.First, the first operation of the optical aberration correcting that carries out camera etc. is described.First operation (step S101-S104) does not change the camera 13 of Fig. 1 and the position relationship of screen 12, as long as no the Essential colour changed from the projected image of projector 20, there is no need each enforcement.By the projector 20 of detected object or or the projector of identical machine be set in stationary installation 11.Then, high-ranking officers' elevational element 15 is arranged near before screen 12.Or also can unload sub-screen 12, rectifying plane parts are set.Pre-set screen 12 and rectifying plane parts 15, make the rectifying plane of optical surface at screen 12 and rectifying plane parts 15, the problem such as do not have focal position inconsistent.Then, from projector by the rectifying plane (step S101) of the homogeneous view data of Essential colour illumination at rectifying plane parts 15.Further, make the light from other light source not inject.The homogeneous view data of so-called Essential colour refers to the Essential colour used in the pattern colour of projector is formed, and such as, in RGB three-plate type liquid crystal projector, only irradiate R light, other G light, B light is by complete shading.The rectifying plane black and white pattern of rectifying plane parts 15 is formed, and illumination light is the Essential colour of projector, and therefore, the light reflected at screen 12 only reflects in the white portion of the rectifying plane of rectifying plane parts 15.This reflected light becomes the dichroism reflecting projector same as before.In this condition, use the camera 13 of Fig. 1, (step S102) is photographed to the rectifying plane of rectifying plane parts 15.According to the 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 coordinate (step S103) of check point.Then, use the measured value of the rectifying plane of rectifying plane parts 15, calculate the projector 20 of detected object Essential colour, the correction process data (step S104) of the anamorphose of the camera of the chromatic aberation composition of the lens that comprise camera 13.
At this, the correction summary using the projector projecting figure of correction graph to detect coordinate is described with reference to Fig. 5.In the figure, according to the coordinate 31 of the correction graph detected, and the relation of coordinate 32 of the correct correction graph calculated from the measured value imagination of actual measurement, the coordinate 33 of the projector figure detected is carried out correction to the coordinate 34 after correction.Fig. 6 represents this correction computing method one example.In this correction calculates, calculate the ratio of the distance summation of the lighting position of distance relatively from each check point of correction graph to projector of the lighting graph position from each check point to projector, according to the difference of the coordinate of the X of each check point, Building Y target and ideal point, carry out position correction, ask for the location coordinate of projector lighting figure.Calculated by this correction, the projector figure coordinate detected is projected to the correct correction graph coordinate of imagination setting, therefore, by camera correction distortion composition.The desirable coordinate A ' of each point shown in this figure, B ', C ' data in advance be stored in storer.
More particularly, each symbolic significance and being calculated as follows in Fig. 6:
A, B, C: the check point of correction graph
A ', B ', C ': the desirable coordinate of each point
P: projector lighting graph position
P ': position obtains the projector lighting graph position of correction
La, Lb, Lc: the distance of check point and lighting figure
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 checked as anamorphose of key diagram 4, arrange the projector 20 of the detected object of Fig. 1 in stationary installation 11, location graphic is projected to the screen 12 (step S106) switched from rectifying plane parts by the Essential colour used with timing from projector 20.The correction graph that this location graphic also uses Fig. 2 and Fig. 3 such.But both there is no need must be consistent.Then, with camera 13 to the image photography (step S107) being projected in this screen 12, resolve this picture signal by image analysis means, calculate the coordinate values (step S108) of location graphic.Coordinate values is used in the correction data that the first operation obtains, the error composition (step S109) of the aberration that correction camera chain has etc.Further, Fig. 7 of anamorphose status image of projector is being represented, the coordinate 33 of the projector figure that the shooting means of expression Fig. 1 detect, and the coordinate 34 of projector figure by above-mentioned correction method correction.At the coordinate 34 of the projector figure detected, anamorphose also comprises the lens aberration composition of shooting means, on the other hand, carries out correction result to it, in figure coordinate, becomes the distortion composition that the projector self as just detected object causes.According to these two data, calculate as anamorphose characteristic quantity, the error etc. of multiplying power that spacing between the rectilinearity of straight line that formed because of each figure coordinate or straight line is formed, can check image distortion (step S110).Like this, the optical aberration correcting of the camera for deformation detection can be carried out respectively in the first operation, carry out the deformation detection of the image quality characteristics as projector in the second operation.
In the image detection device of another variation as the invention process form, look is formed (if RGB by the coloured image of the projector of detected object, assorted by R, G, B) operation carried out of the Essential colour of implementing only projector, relatively respectively form the location graphic error of look, ask for the color shift amount distribution of the projected image universe of projector.Specifically, in three-plate type liquid crystal projector, three optical images carrying RGB form panel, form image, therefore at each panel, be suitable for this example occasion, as shown in Figure 8, by R, G, B tri-look carry out above-mentioned first operation and above-mentioned second operation (step S201, step S202 respectively, step S203), carry out location graphic detection.Then, calculate color shift amount (step S204) from each graphic block scale value of RGB, carry out the inspection (step S205) of color shift amount.
, image testing device is described below, checks the quality of the projected image of the projector of the inspected object obtained by above-mentioned image detection device.This image testing device actual projection checker pattern, is obtained the coordinate of each intersection point by above-mentioned image detection device, check location, asperratio, line bend, color shift.
First, localization examination is described.At this, location refers to projected image position.Check and carry out after the projector of inspected object is arranged on assigned address.Further, use the zoom function of projector, carry out the operations such as zoom, become appointment projection size.The position of the projected image on screen is at this moment location.Projected image on screen when Fig. 9 represents localization examination.Solid line in this figure is the examined projecting figure 41 projected on the screen 40, and dotted line is preferred view figure 42.The desirable coordinate values as projecting figure assigned address of the relative correction face of presetting initial point, the difference according to the coordinate values of the projected image with reality checks.Further, judge that whether the difference (Δ X, Δ Y) of check object position 43 and preferred view figure is, below the specification value of specifying, position inspection.
Below, asperratio inspection is described.At this, so-called asperratio refers to the aspect ratio of projected image.The projector of inspected object has the design load of the asperratio of projected image.Asperratio the occasion more than tolerance of this design load relative, such as, the aspect ratio of projection word is different from design load.Such as, become pressure to collapse shape word.So the inspection of asperratio as shown in Figure 10, detects longitudinal size LY and the lateral dimension LX of projection examined projecting figure on the screen 40.Further, calculate asperratio R=LY/LX, compare with design load tolerance, check asperratio.
Below, illustrate that line is bending to check.In projected image, sometimes originally for the figure of straight line projects with case of bending.Especially, carry the occasions such as short focus projection device etc., non-spherical lens or catoptron, sometimes because of components accuracy or assembly precision reason, projected image is out of shape.So in online bending inspection, as shown in figure 11, any line of each line formed for checker pattern or all line carry out that line is bending to be checked.Further, the index that line that expression should be straight line originally bends how degree is asked for.Specifically, as shown in figure 11, based on each intersection point coordinate of the checker pattern of shape being aligned, relatively with the straight line that its starting point and end point are formed, to each fulcrum coordinate, its vertical direction distance is asked for.Wherein, ask for respectively+side and the-maximal value of side, differed from and be set to index (amount of bow).By comparing this amount of bow and specification value, check that line bends.
Below, the inspection of color shift is described.As shown in Figure 8 above, form look by the coloured image of the projector of detected object and implement image detection, relatively respectively form the location graphic error of look.Thus, the color shift amount distribution of the projected image universe of projector is asked for.Specifically, especially in three-plate type liquid crystal projector, carry three pieces of liquid crystal panels of RGB, form image with each panel, therefore, carry out location graphic detection by RGB tri-look.Then, calculate color shift amount from each graphic block scale value of RGB, carry out color shift inspection.
Above-mentioned explanation is the invention process one example, and the present invention has distinctive effect in following form.
[form A]
In the image detecting method of this example, as mentioned above, during 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, regardless of the dichroism of the projected image light of projector, the aberration composition of the optical system of the correct correction camera of energy, even if a small amount of camera also can be suitable for broader region, the optical characteristics of projected image can be detected accurately.
[form B]
In form A, correction graph and detection figure are identical figure.Thus, as mentioned above, the compensating value for anamorphose can be calculated more simply.
[form C]
In form A or form B, with the optical illumination correction graph of each Essential colour of formation coloured image, respectively the correction graph of each Essential colour is photographed by camera, calculate the compensating value of the distortion composition of the optical characteristics of the camera of each Essential colour respectively.Thus, as the explanation of above-mentioned example variation, when detecting color shift, for the aberration composition that camera chain has, use each projected image light corresponding with the Essential colour of the coloured image of the projector of detected object, calculate compensating value respectively, therefore, can regardless of the dichroism of the projected image light of projector, the aberration composition of correct correction camera chain, can detect the optical characteristics of projected image accurately.
[form D]
In the image detection device of this example, as mentioned above, during detected image distortion, for the aberration composition that photography means have self, use the projected image light of the projector of detected object, calculate compensating value, therefore, can regardless of the dichroism of the projected image light of projector, the aberration composition of the optical system of correct correction photography means, even if a small amount of camera also can be suitable for broader region, the optical characteristics of projected image can be detected accurately.
[form E]
In form D, with the optical illumination correction graph of each Essential colour of formation coloured image, respectively the correction graph of each Essential colour is photographed by camera, calculate the compensating value of the distortion composition of the optical characteristics of the photography means of each Essential colour respectively.Thus, as the explanation of above-mentioned example variation, when detecting color shift, for the aberration composition that camera chain has, use each projected image light corresponding with the Essential colour of the coloured image of the projector of detected object, calculate compensating value respectively, therefore, can regardless of the dichroism of the projected image light of projector, the aberration composition of correct correction camera chain, can detect the optical characteristics of projected image accurately.
[form F]
Use the image detection device of form D or form E, to the projector by detected object project determine figure and carry out photography and obtain projected image, according to the characteristic value of this projected image, inspection projected image quality.Thus, illustrated by model deformation example as implemented, the quality inspection of the image of projector projection can be carried out with the characteristic value of projected image, such as, locate, asperratio, line bends, the inspection of color shift, therefore, compared with visual examination, check result can eliminate deviation.
Above with reference to illustrating example of the present invention, but the present invention is not limited to above-mentioned example.Can do all changes in the technology of the present invention thought range, they all belong to protection scope of the present invention.
Claims (6)
1. an image detecting method, image detection device comprises:
Camera, it is photographed to the projected image be projected, and wherein, is projected in screen by the projector of detected object by the light image be made from the light beam of light source irradiation according to modulate image information; And
Image processing apparatus, resolves the picture signal exported from this camera, calculates the distortion composition of the optical characteristics of projected image;
According to the picture signal exported from this camera, detect the optical characteristics of projected image;
With black and white and with determined figure formation correction graph, rectifying plane parts have the rectifying plane of described correction graph, by the above-mentioned rectifying plane of above-mentioned projector monochromation illumination above-mentioned rectifying plane parts, photographed by the correction graph of above-mentioned camera to above-mentioned rectifying plane, by above-mentioned image processing apparatus, according to the picture signal exported from above-mentioned camera, resolve the position of above-mentioned correction graph, according to resolving the position of above-mentioned correction graph of reality and the relativeness of the position of desirable above-mentioned correction graph that obtain, calculate the compensating value of the distortion composition of the optical characteristics of above-mentioned camera,
By above-mentioned projector by the projector, image projection that generates according to the image information of fixed detection figure on screen, by above-mentioned camera, above-mentioned projected image is photographed, from above-mentioned camera output image signal, according to the compensating value of the distortion composition of the optical characteristics of calculated above-mentioned camera, the above-mentioned picture signal of correction, detects the optical characteristics of above-mentioned projected image according to the picture signal of correction.
2. image detecting method according to claim 1, is characterized in that:
Above-mentioned correction graph and above-mentioned detection figure are identical figure.
3. image detecting method according to claim 1 and 2, is characterized in that:
Use the above-mentioned projector of detected object throw light on above-mentioned correction graph time, the above-mentioned correction graph of optical illumination of each Essential colour of coloured image is formed by projector, respectively the correction graph of the above-mentioned rectifying plane of each Essential colour is photographed by above-mentioned camera, the compensating value of the distortion composition of the optical characteristics of the above-mentioned camera of above-mentioned each Essential colour is calculated respectively by above-mentioned image processing apparatus, when the above-mentioned projector by detected object by the projector, image projection of detection figure to screen time, to project detection figure by above-mentioned each Essential colour, correction is carried out according to each compensating value corresponding with each Essential colour, according in the projected image of each Essential colour, relative position between the coordinate position becoming the detection figure of corresponding relation, calculate the color shift distribution of projected image.
4. an image detection device, comprising:
Camera, it is photographed to the projected image be projected, and wherein, is projected in screen by the projector of detected object by the light image be made from the light beam of light source irradiation according to modulate image information; And
Image processing apparatus, resolves the picture signal exported from this camera, calculates the distortion composition of the optical characteristics of projected image;
According to the picture signal exported from this camera, detect the optical characteristics of projected image;
With black and white and with determined figure formation correction graph, rectifying plane parts have the rectifying plane of described correction graph, by the above-mentioned rectifying plane of above-mentioned projector monochromation illumination above-mentioned rectifying plane parts, are photographed to above-mentioned rectifying plane by above-mentioned camera;
Above-mentioned image processing apparatus is according to the picture signal exported from above-mentioned camera, resolve the position of above-mentioned correction graph, according to resolving the position of above-mentioned correction graph of reality and the relativeness of the position of desirable above-mentioned correction graph that obtain, calculate the compensating value of the distortion composition of the optical characteristics of above-mentioned camera;
Generate projected image by above-mentioned projector according to the image information of fixed detection figure, replace with above-mentioned rectifying plane parts, be projected on above-mentioned screen, above-mentioned camera is photographed to above-mentioned projected image;
The compensating value of the distortion composition of the optical characteristics of the above-mentioned camera that above-mentioned image processing apparatus obtains according to precalculating, the picture signal that correction exports from above-mentioned camera, detects the optical characteristics of above-mentioned projected image according to the picture signal of correction.
5. image detection device according to claim 4, is characterized in that:
The above-mentioned camera above-mentioned correction graph of optical illumination of each Essential colour being formed coloured image by above-mentioned projector, photographs to the correction graph of the above-mentioned rectifying plane of each Essential colour respectively;
Above-mentioned image processing apparatus calculates the compensating value of the distortion composition of the optical characteristics of the above-mentioned camera of above-mentioned each Essential colour respectively;
Above-mentioned camera is when making the projected image of above-mentioned projector projection detection figure of detected object, to project detection figure by above-mentioned each Essential colour, correction is carried out according to each compensating value corresponding with each Essential colour, according in the projected image of each Essential colour, relative position between the coordinate position of the detection figure that becomes corresponding relation, calculate the color shift distribution of projected image.
6. an image testing device, is characterized in that:
Use the image detection device that claim 4 or 5 is recorded, determine figure photography according to the institute projected to the above-mentioned projector by detected object and the characteristic value of projected image that obtains, inspection projected image quality.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-131185 | 2011-06-13 | ||
| JP2011131185 | 2011-06-13 | ||
| JP2012-086258 | 2012-04-05 | ||
| JP2012086258A JP2013021674A (en) | 2011-06-13 | 2012-04-05 | Image measuring method, image measuring device and image inspection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102829956A CN102829956A (en) | 2012-12-19 |
| CN102829956B true CN102829956B (en) | 2015-04-15 |
Family
ID=47333170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210199854.8A Active 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) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113271447B (en) * | 2021-05-25 | 2022-10-25 | 青岛海信激光显示股份有限公司 | Laser projection apparatus 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 |
Citations (3)
| 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 |
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2012
- 2012-06-13 CN CN201210199854.8A patent/CN102829956B/en active Active
Patent Citations (3)
| 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102829956A (en) | 2012-12-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107343130B (en) | High dynamic imaging module based on DMD dynamic light splitting | |
| 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 | |
| JP3937024B2 (en) | Detection of misalignment, pattern rotation, distortion, and misalignment using moiré fringes | |
| KR20000071453A (en) | Rangefinder | |
| US6760096B2 (en) | Lens-evaluating method and lens-evaluating apparatus | |
| US10444162B2 (en) | Method of testing an object and apparatus for performing the same | |
| 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 | |
| US20120081678A1 (en) | Projection display apparatus and image adjustment method | |
| US7834996B2 (en) | Inspection apparatus and method | |
| JP2005331585A (en) | Projector having device for measuring distance and tilt angle | |
| US20080279458A1 (en) | Imaging system for shape measurement of partially-specular object and method thereof | |
| CN108848358B (en) | Method and device for correcting color convergence errors | |
| JP2006084286A (en) | Three-dimensional measuring method and its measuring device | |
| JP2013019886A (en) | Image measurement device | |
| WO2018079030A1 (en) | Distance measurement apparatus, distance measurement method, and distance measurement program | |
| CN112815846A (en) | 2D and 3D composite high-precision vision device and measuring method | |
| CN111982025A (en) | Point cloud data acquisition method and system for mold detection | |
| TW202113344A (en) | Appearance inspection device, appearance inspection device calibration method, and program | |
| CN214333663U (en) | 2D and 3D combined high-precision vision device | |
| CN109655005B (en) | Film thickness measuring apparatus, substrate inspecting apparatus, film thickness measuring method, and substrate inspecting method | |
| KR101877548B1 (en) | Image generation system for projection on curved surface and generation method therefor | |
| KR101000855B1 (en) | Height measuring apparatus of an object to be measured |
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 |