CN110276792A - Model acquisition methods and device based on digital filter - Google Patents
Model acquisition methods and device based on digital filter Download PDFInfo
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- CN110276792A CN110276792A CN201910443724.6A CN201910443724A CN110276792A CN 110276792 A CN110276792 A CN 110276792A CN 201910443724 A CN201910443724 A CN 201910443724A CN 110276792 A CN110276792 A CN 110276792A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/50—Depth or shape recovery
- G06T7/521—Depth or shape recovery from laser ranging, e.g. using interferometry; from the projection of structured light
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10004—Still image; Photographic image
- G06T2207/10012—Stereo images
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- Optics & Photonics (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a kind of model acquisition methods and device based on digital filter, the model acquisition methods are realized by a model acquisition device, model acquisition device includes a camera, a digital filter, a projector and a processor, and model acquisition methods include: that processor demarcates the camera and projector；Projector projects sinusoidal configuration light；Camera shoots sinusoidal configuration photogenerated structure optical image；The digital filter obtains filtering image；Processor obtains absolute phase-shift according to the package phase shift for filtering image capturing sinusoidal configuration light, and according to the package phase shift；The projector projects sinusoidal configuration light on target object；The object image for the target object that camera shooting is projected by sinusoidal configuration light；The processor obtains the threedimensional model of target object according to the absolute phase-shift and object image of sinusoidal configuration light.The present invention has arithmetic speed fast, and the time for obtaining the model of object is short, the higher advantage of model accuracy.
Description
Technical field
The present invention relates to a kind of model acquisition methods and device based on digital filter.
Background technique
Three-dimensional reconstruction refers to the mathematical model established to three-dimension object and be suitble to computer representation and processing, is in computer ring
The basis of its property is handled it, operated and analyzed under border, and establishes the virtual of expression objective world in a computer
The key technology of reality.
It is a kind of three-dimensional reconstruction mode that optical grating projection, which carries out three-dimensional reconstruction, and grating is projected to reference planes respectively and is tested
Body surface, what it is due to reference planes selection is horizontal plane, and the reference grating projected to above will not deform；Work as grating
When projecting to testee surface, grating can generate different degrees of deformation, be that measured object body surface is received due to projection grating
The modulation of face height.The testee height placed is different, and the phase change degree of grating is also different therewith, and two-dimensional surface becomes
The three-dimensional appearance information of body surface is carried in the phase change of shape striped.It therefore, can be with by seeking the changing value of phase
Height of the object at respective point is obtained, to obtain the chamfered shape of three-dimension object.
Slow, the low defect of precision that there are modeling speeds in existing optical grating projection progress three-dimensional reconstruction.
Summary of the invention
The technical problem to be solved by the present invention is to model to overcome existing optical grating projection exist in three-dimensional reconstruction
Speed is slow, the low defect of precision, provides fast with arithmetic speed, and the time for obtaining the model of object is short, and model accuracy is higher
The model acquisition methods and device based on digital filter of advantage.
The present invention is to solve above-mentioned technical problem by following technical proposals:
A kind of model acquisition methods based on digital filter, it is characterized in that, the model acquisition methods pass through a mould
Type acquisition device realizes that the model acquisition device includes a camera, a digital filter, a projector and a processor,
The model acquisition methods include:
The processor demarcates the camera and projector；
The projector projects sinusoidal configuration light；
Camera shoots sinusoidal configuration photogenerated structure optical image；
The low frequency signal and negative frequency signal that the digital filter filters the structure optical image are to obtain filtering image；
The processor and is obtained according to the package phase shift of filtering image capturing sinusoidal configuration light according to the package phase shift
Take absolute phase-shift；
The projector projects sinusoidal configuration light on target object；
The object image for the target object that the camera shooting is projected by sinusoidal configuration light；
The processor obtains the three-dimensional mould of target object according to the absolute phase-shift and object image of sinusoidal configuration light
Type.
Preferably, for the lateral coordinates such as imaging point on the filtering image, the processor according to formula f (x)=
a0+a0cos(2πf0X) the package phase shift of the imaging point is obtained.
Preferably, the processor is separately connected the camera and the projector, the processor is to the camera
And the projector sends trigger signal respectively；
The camera includes a pick-up lens, and the projector includes a projection lens, the shooting side of the pick-up lens
The plane domain is directed to the projecting direction of the projection lens；
The model acquisition methods include:
The plane domain is equipped with a removable calibration pattern；
The plane domain of the camera shooting only calibration pattern is calibration image；
The processor demarcates the camera using the calibration image, and obtains camera calibration data；
The projector projects the calibration picture of at least two brightness to the plane domain；
The calibration picture that the camera shoots each brightness on the plane domain is picture images；
The processor carries out projector and the camera using the camera calibration data and the picture images
Between calibration.
Preferably, the projector projects the calibration picture of at least two brightness to the plane domain, comprising:
The projector projects the calibration picture of at least two gray scale to the plane domain；Or,
The projector projects at least two in the calibration maps on piece to one calibration picture of plane domain projection
The grayscale image of gray scale.
Preferably, the plane domain includes: equipped with a removable calibration pattern
Calibration pattern, the color changeable of the calibration pattern are shown on the plane domain；
The camera transmits the calibration image of the calibration pattern of at least two color to the processor；
The processor passes through whole calibration images and demarcates the camera.
Preferably, the plane domain includes a power supply module and a display panel, the display panel is equipped with electricity
Chromotropic dye is caused, the power supply module is connect with the electrochromic dyes.
Preferably, the plane domain is a translucent blank, the calibration maps are printed in the front of the translucent blank
Case, the back side of the translucent blank are equipped with several LED light, and the illumination direction of the LED light is directed at the translucent blank；
The model acquisition methods include:
The processor controls the brightness of the LED light；
After the processor also sends adjusting luminance signal to the control chip, Xiang Suoshu camera sends trigger signal.
Preferably, the plane domain is liquid crystal planer region, the liquid crystal planer region shows predetermined pattern, described pre-
If the shape of pattern is identical as the calibration shape of pattern, the color changeable of predetermined pattern.
The present invention also provides a kind of model acquisition device based on digital filter, it is characterized in that, the model obtains
Device includes a camera, a projector and a processor, and the model acquisition device obtains for realizing model as described above
Take method.
Preferably, the processor includes opening for the model DLP LightCrafter4500 of Texas Instruments
Plate is sent out, the model acquisition device includes a shell, and the camera and the projector are set in the shell, the phase
Machine includes a pick-up lens, and the projector includes a projection lens, the pick-up lens and the projection lens and shoots
In the front of the shell.
On the basis of common knowledge of the art, above-mentioned each optimum condition, can any combination to get each preferable reality of the present invention
Example.
The positive effect of the present invention is that:
Model acquisition device based on digital filter of the invention have arithmetic speed it is fast, obtain the model of object when
Between short, the higher advantage of model accuracy.
Detailed description of the invention
Fig. 1 is the flow chart of the model acquisition methods of the embodiment of the present invention 1.
Specific embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.
Embodiment 1
The present embodiment provides a kind of model acquisition device based on digital filter, the model acquisition device include a phase
Machine, a projector, a digital filter and a processor.
The processor includes the development board of the model DLP LightCrafter 4500 of Texas Instruments.
The processor is for demarcating the camera and projector；
The projector is for projecting sinusoidal configuration light；
Camera is for shooting sinusoidal configuration photogenerated structure optical image；
The low frequency signal and negative frequency signal that the digital filter is used to filter the structure optical image are to obtain filtering shadow
Picture；
The processor is used for the package phase shift according to filtering image capturing sinusoidal configuration light, and according to the package phase
It moves and obtains absolute phase-shift；The package phase shift for having passed through multiframe sinusoidal configuration light for obtaining absolute phase-shift obtains, and can also pass through
The mode of space encoding alignment projection obtains the absolute phase-shift.
The projector is used to project sinusoidal configuration light on target object；
The camera is used to shoot the object image of the target object projected by sinusoidal configuration light；
The processor is used to obtain the three of target object according to the package phase shift of sinusoidal configuration light and object image
Dimension module.
Specifically, for the lateral coordinates such as imaging point on the filtering image, the processor according to formula f (x)=
a0+a0cos(2πf0X) the package phase shift of the imaging point is obtained.
The low frequency signal and negative frequency signal that the digital filter filters the structure optical image are led to obtaining filtering image
The expression formula of real and imaginary parts of imaging point, the letter comprising the package phase shift in the imaginary part can be obtained by crossing digital filter
Breath.
The model acquisition device of the present embodiment includes the function of specific calibration for cameras and projector.
The processor is separately connected the camera and the projector, and the processor is to the camera and the throwing
Shadow instrument sends trigger signal respectively；
The camera includes a pick-up lens, and the projector includes a projection lens, the shooting side of the pick-up lens
The plane domain is directed to the projecting direction of the projection lens；
The plane domain is equipped with a removable calibration pattern；
The plane domain that the camera is used to shoot only calibration pattern is calibration image；
The processor is used to demarcate the camera using the calibration image, and obtains camera calibration data；
The projector is used to project the calibration picture of at least two brightness to the plane domain；
The calibration picture that the camera is used to shoot each brightness on the plane domain is picture images；
The processor is used to utilize the camera calibration data and picture images progress projector and described
Calibration between camera.
Specifically, the projector projects the calibration picture of at least two brightness to the plane domain.
The calibration picture of two brightness can by two ways one of obtain.
The projector projects the calibration picture of at least two gray scale to the plane domain；Or,
The projector projects at least two in the calibration maps on piece to one calibration picture of plane domain projection
The grayscale image of gray scale.
The plane domain is equipped with a removable calibration pattern
Calibration pattern, the color changeable of the calibration pattern are shown on the plane domain；
The camera is used to transmit the calibration image of the calibration pattern of at least two color to the processor；
The processor is used to demarcate the camera by whole calibration images.
The function of the calibration pattern variable color can be realized by following 3 kinds of modes:
Mode one, the plane domain include a power supply module and a display panel, and the display panel is equipped with electricity
Chromotropic dye is caused, the power supply module is connect with the electrochromic dyes.
Mode two, the plane domain are a translucent blank, and the calibration maps are printed in the front of the translucent blank
Case, the back side of the translucent blank are equipped with several LED light, and the illumination direction of the LED light is directed at the translucent blank；
The model acquisition methods include:
The processor controls the brightness of the LED light；
After the processor also sends adjusting luminance signal to the control chip, Xiang Suoshu camera sends trigger signal.
Mode three, the plane domain are liquid crystal planer region, and the liquid crystal planer region shows predetermined pattern, described pre-
If the shape of pattern is identical as the calibration shape of pattern, the color changeable of predetermined pattern.
Fig. 1, using above-mentioned model acquisition device, the present embodiment also provides a kind of model acquisition methods, comprising:
Step 100, the processor demarcate the camera and projector；
Step 101, the projector projects sinusoidal configuration light；
Step 102, camera shoot sinusoidal configuration photogenerated structure optical image；
The low frequency signal and negative frequency signal that step 103, the digital filter filter the structure optical image are to obtain filter
Wave image；
Step 104, the processor are according to the package phase shift of filtering image capturing sinusoidal configuration light, and according to the packet
It wraps up in phase shift and obtains absolute phase-shift；
Step 105, the projector project sinusoidal configuration light on target object；
The object image for the target object that step 106, camera shooting are projected by sinusoidal configuration light；
Step 107, the processor obtain target object according to the absolute phase-shift and object image of sinusoidal configuration light
Threedimensional model.
In step 103, for lateral coordinates such as the imaging points filtered on image, the processor is according to formula f (x)
=a0+a0cos(2πf0X) the package phase shift of the imaging point is obtained.
Wherein the camera of step 100 and the scaling method of projector include:
Plane domain is equipped with a removable calibration pattern；
The plane domain of the camera shooting only calibration pattern is calibration image；
The processor demarcates the camera using the calibration image, and obtains camera calibration data；
The projector projects the calibration picture of at least two brightness to the plane domain；
The calibration picture that the camera shoots each brightness on the plane domain is picture images；
The processor carries out projector and the camera using the camera calibration data and the picture images
Between calibration.
The projector projects the calibration picture of at least two brightness to the plane domain, comprising:
The projector projects the calibration picture of at least two gray scale to the plane domain；
Furthermore it is also possible to by the projector to one calibration picture of plane domain projection, and in the calibration maps
On piece projects the grayscale image of at least two gray scale.Namely think that the mode of calibration maps on piece polishing obtains the calibration of two brightness
Picture.
The plane domain is equipped with a removable calibration pattern
Calibration pattern, the color changeable of the calibration pattern are shown on the plane domain；
The camera transmits the calibration image of the calibration pattern of at least two color to the processor；
The processor passes through whole calibration images and demarcates the camera.
The color changeable of the calibration pattern may include by following 3 kinds of implementation methods:
The plane domain includes a power supply module and a display panel, and the display panel is contaminated equipped with electrochromism
Material, the power supply module are connect with the electrochromic dyes.
The plane domain is a translucent blank, and the calibration pattern is printed in the front of the translucent blank, described
The back side of translucent blank is equipped with several LED light, and the illumination direction of the LED light is directed at the translucent blank；
The model acquisition methods include:
The processor controls the brightness of the LED light；
After the processor also sends adjusting luminance signal to the control chip, Xiang Suoshu camera sends trigger signal.
Stating plane domain is liquid crystal planer region, and the liquid crystal planer region shows predetermined pattern, the predetermined pattern
Shape is identical as the calibration shape of pattern, the color changeable of predetermined pattern.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that these
It is merely illustrative of, protection scope of the present invention is defined by the appended claims.Those skilled in the art is not carrying on the back
Under the premise of from the principle and substance of the present invention, many changes and modifications may be made, but these are changed
Protection scope of the present invention is each fallen with modification.
Claims (10)
1. a kind of model acquisition methods based on digital filter, which is characterized in that the model acquisition methods pass through a model
Acquisition device realizes that the model acquisition device includes a camera, a digital filter, a projector and a processor, institute
Stating model acquisition methods includes:
The processor demarcates the camera and projector；
The projector projects sinusoidal configuration light；
Camera shoots sinusoidal configuration photogenerated structure optical image；
The low frequency signal and negative frequency signal that the digital filter filters the structure optical image are to obtain filtering image；
The processor obtains absolutely according to the package phase shift for filtering image capturing sinusoidal configuration light, and according to the package phase shift
To phase shift；
The projector projects sinusoidal configuration light on target object；
The object image for the target object that the camera shooting is projected by sinusoidal configuration light；
The processor obtains the threedimensional model of target object according to the absolute phase-shift and object image of sinusoidal configuration light.
2. model acquisition methods as described in claim 1, which is characterized in that for cross such as the imaging points filtered on image
To coordinate, the processor is according to formula f (x)=a0+a0cos(2πf0X) the package phase shift of the imaging point is obtained.
3. model acquisition methods as described in claim 1, which is characterized in that the processor be separately connected the camera and
The projector, the processor send trigger signal to the camera and the projector respectively；
The camera include a pick-up lens, the projector include a projection lens, the shooting direction of the pick-up lens with
The projecting direction of the projection lens is directed at the plane domain；
The model acquisition methods include:
The plane domain is equipped with a removable calibration pattern；
The plane domain of the camera shooting only calibration pattern is calibration image；
The processor demarcates the camera using the calibration image, and obtains camera calibration data；
The projector projects the calibration picture of at least two brightness to the plane domain；
The calibration picture that the camera shoots each brightness on the plane domain is picture images；
The processor is carried out between projector and the camera using the camera calibration data and the picture images
Calibration.
4. model acquisition methods as claimed in claim 3, which is characterized in that the projector is projected to the plane domain
The calibration picture of few 2 brightness, comprising:
The projector projects the calibration picture of at least two gray scale to the plane domain；Or,
The projector projects at least two gray scale in the calibration maps on piece to one calibration picture of plane domain projection
Grayscale image.
5. model acquisition methods as claimed in claim 3, which is characterized in that the plane domain is equipped with a removable mark
Determining pattern includes:
Calibration pattern, the color changeable of the calibration pattern are shown on the plane domain；
The camera transmits the calibration image of the calibration pattern of at least two color to the processor；
The processor passes through whole calibration images and demarcates the camera.
6. model acquisition methods as claimed in claim 5, which is characterized in that the plane domain include a power supply module and
One display panel, the display panel are equipped with electrochromic dyes, and the power supply module is connect with the electrochromic dyes.
7. model acquisition methods as claimed in claim 5, which is characterized in that the plane domain is a translucent blank, institute
The calibration pattern is printed in the front for stating translucent blank, and the back side of the translucent blank is equipped with several LED light, the LED
The illumination direction of lamp is directed at the translucent blank；
The model acquisition methods include:
The processor controls the brightness of the LED light；
After the processor also sends adjusting luminance signal to the control chip, Xiang Suoshu camera sends trigger signal.
8. model acquisition methods as claimed in claim 5, which is characterized in that the plane domain is liquid crystal planer region, institute
It states liquid crystal planer region and shows predetermined pattern, the shape of the predetermined pattern is identical as the calibration shape of pattern, presets figure
The color changeable of case.
9. a kind of model acquisition device based on digital filter, which is characterized in that the model acquisition device include a camera,
One projector and a processor, the model acquisition device is for realizing mould as claimed in any of claims 1 to 8 in one of claims
Type acquisition methods.
10. model acquisition device as claimed in claim 9, which is characterized in that the processor includes Texas Instruments's public affairs
The development board of the model DLP LightCrafter 4500 of department, the model acquisition device include a shell, the camera with
And the projector is set in the shell, the camera includes a pick-up lens, and the projector includes a projection lens,
The pick-up lens and the projection lens are simultaneously shot in the front of the shell.
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