CN104796651B - A kind of projected image calibration method and projection device - Google Patents
A kind of projected image calibration method and projection device Download PDFInfo
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Abstract
The present invention relates to projection display technique field, a kind of projected image calibration method of offer of the embodiment of the present invention and projection device, this method include：To perspective plane projection calibration image, projected image is formed, wherein include four projection target spots in the projected image；Determine the distance that target spot is each projected in four projection target spots described in the projected image to projection device；According to each projection target spot between the distance of the projection device ratio and default ratio determine the scaling ratio of the projected image, and the projected image is calibrated according to the scaling ratio.
Description
Technical field
The present invention relates to projection display technique field more particularly to a kind of projected image calibration methods and projection device.
Background technology
Projection device is usually the angle of an acquiescence with the angle on perspective plane in projection process, at this time projection device
It can be by the projection of the ratios such as image on the projection surface, if projection device and perspective plane can cause not in the angle of acquiescence
There is shape distortion or distortion in the projected image of projection.For example the projection that an acquiescence is projected perpendicular to perspective plane is set
Standby, after the angulation change given tacit consent to perspective plane, the image that projection goes out just will appear distortion geometrically.
In the prior art, in order to be calibrated to the projected image that projection goes out, mainly pass through manual school
Standard is adjusted the focal length of projection device by the position of manual mobile projector device, to realize calibration projected image, shows
Right this manual calibration is time-consuming and laborious and cannot obtain accurate calibration result.
Invention content
A kind of projected image calibration method of offer of the embodiment of the present invention and projection device, can not be certainly to solve projection device
The problem of dynamic calibration projected image.
An embodiment of the present invention provides a kind of projected image calibration methods, including：
Projection device projects perspective plane, forms projected image, wherein includes four projections in the projected image
Target spot；
Determine the distance that target spot is each projected in four projection target spots described in the projected image to projection device；
According to it is each projection target spot between the distance of the projection lens ratio and default ratio determine the throwing
The scaling ratio of shadow image, and the projected image is calibrated according to the scaling ratio.
An embodiment of the present invention provides a kind of projection devices, including：
Projecting cell forms projected image for being projected to perspective plane, wherein includes four in the projected image
A projection target spot；
Distance measuring unit, for determining that each project target spot in four projection target spots described in the projected image sets to projection
Standby distance；
Alignment unit, for according to each projection target spot between the distance of the projection lens ratio and default compare
Value determines the scaling ratio of the projected image, and is calibrated to the projected image according to the scaling ratio.
The projected image calibration method and projection device provided according to embodiments of the present invention is thrown by measuring in projected image
Distance of the shadow target spot to projection device, it may be determined that whether projected image is distorted.When being determined that projected image is distorted
And after type of distortion, the contracting of projected image is determined to default ratio between the distance of projection device according to each projection target spot
Ratio is put, to realize the calibration to projected image.
Description of the drawings
Fig. 1 is a kind of projected image calibration method flow chart provided in an embodiment of the present invention；
Fig. 2 is a kind of projection target spot schematic diagram provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram of a kind of projection device provided in an embodiment of the present invention and projection target spot；
Fig. 4 is that a kind of projected image provided in an embodiment of the present invention is distorted schematic diagram；
Fig. 5 is the spatial position schematic diagram of a kind of projection device provided in an embodiment of the present invention and projection target spot；
Fig. 6 is a kind of projected image level distortion schematic diagram provided in an embodiment of the present invention；
Fig. 7 is that a kind of projected image provided in an embodiment of the present invention is vertically distorted schematic diagram；
Fig. 8 is a kind of projection device structure chart provided in an embodiment of the present invention.
Specific implementation mode
The embodiment of the present invention is described in detail with reference to the accompanying drawings of the specification.
As shown in Figure 1, a kind of projected image calibration method flow chart provided in an embodiment of the present invention, this method include：
Step 101：Projection device projects perspective plane, forms projected image, wherein include in the projected image
Four projection target spots；
Step 102：It determines in four projection target spots described in the projected image and each projects target spot to projection device
Distance；
Step 103：According to it is each projection target spot between the distance of the projection lens ratio and default ratio it is true
The scaling ratio of the fixed projected image, and the projected image is calibrated according to the scaling ratio.
In a step 101, the projected image that projection device carries out projection formation to perspective plane can be any one sub-picture,
It is not limited in the embodiment of the present invention, it is only necessary to four projection target spots are formed in the projected image of formation.It needs to illustrate
It is that the target spot that projection device is formed is can be distinguished with any point in projected image, equipment identification can be projected
Point, each target spot that projects occupy a pixel.
It includes the first projection target spot, the second projection target spot, that projection device forms four projection target spots in projected image
Three projection target spots, the 4th projection target spot, in order to reduce computation complexity when calibration projected image, four target spots difference of formation
Four apex angles of the rectangle formed positioned at four target spots, i.e., the first projection target spot and the second projection target point are located at the projected image
Same one-row pixels in, third projection target spot and the 4th projection target point be located in the same one-row pixels of the projected image；First
Projection target spot is located at third projection target point in the same row pixel of projected image, the second projection target spot and the 4th projection target point
In the same row pixel of projected image.As shown in Fig. 2, a kind of projection target spot schematic diagram provided in an embodiment of the present invention.Fig. 2
In, projection device carries out projection to perspective plane and forms projected image 201, while four projection targets are formed in projected image 201
Point, the respectively first projection target spot 210, second projects target spot 220, third projection target spot the 230, the 4th projects target spot 240, is formed
Four projection target spots between constitute a rectangle, four target spots are located at four corner positions of the rectangle.
After foring four projection target spots in a step 101, determine that each projection target spot is set to projection by step 102
Standby distance.It should be noted that projected by the projection lens for then passing through projection device, therefore for the ease of measuring,
The distance of each of determining projection target spot to projection device is projection lens of each target spot to projection device in the embodiment of the present invention
The distance of head, naturally it is also possible to be the distance of projection device other component.
It is projection lens of each target spot to projection device in the distance of each of determining projection target spot to projection device
Apart from when, determine each target spot to projection device projection lens apart from there are many ways to, for example, the use of projection device
Laser projection camera lens can thus measure the distance for projecting target spot to laser projection camera lens by laser projection camera lens.Due to swashing
Light projection lens is very expensive, so general it is not recommended that using.Common projection lens is used in the embodiment of the present invention, passes through throwing
Shadow camera lens is determined with position relationship of the projection target spot in geometric space at a distance from each target spot to the projection lens of projection device.
In the embodiment of the present invention, positioned at the configuration of the top of projection lens, there are one the first image capture devices in projection device, are located at and throw
There are one the second image capture device, the projection lens of projection device is located at the first Image Acquisition and sets for the lower section configuration of shadow camera lens
Standby, the second image capture device middle, the first image capture device and the second image capture device can be common take the photograph
As head, or Laser video camera head or infrared camera, the embodiment of the present invention do not limit this.Measuring a projection
It is when target spot is at a distance from projection lens, the first image capture device, the second image capture device and projection target spot difference is true
It is set to three vertex of the triangle being made of them, for a projection target spot, the first image capture device is measured described
Using described first image collecting device as the angle of the first interior angle of apex angle in triangle, pass through second image capture device
It measures in the triangle using second image capture device as the angle of the second interior angle of apex angle；In described first
The angle at angle, the angle of second interior angle and the distance between described first image acquisition and second Image Acquisition,
Determine it is described projection target spot to the projection device distance.Specifically, as shown in figure 3, one kind provided in an embodiment of the present invention
The schematic diagram of projection device and projection target spot.In Fig. 3, the first image capture device A, the second image capture device B and projection
The interior angle ∠ BAF that target spot F constitutes triangle △ an ABF, ∠ 1 and triangle △ ABF are mutually remaining, and ∠ 2 and triangle △ ABF's is interior
Angle ∠ ABF are mutually remaining, and projection lens O is located at the middle of the first image capture device A and the second image capture device B.Pass through
One image capture device A can determine the value of ∠ 1, and the value of ∠ 2 can be determined by the second image capture device B, thus can
Determine the value of ∠ BAF and ∠ ABF, and the distance between the first image capture device A and the second image capture device B AB are to determine
, following formula can be obtained according to sine：
It is set to calculate the distance between the first image capture device A and projection target spot F AF and the second Image Acquisition
The distance between standby B and projection target spot F BF.It should be noted that acquiring the side of the value of ∠ 1 or ∠ 2 by image capture device
There are many methods, and this method is technology well known to those skilled in the art, and details are not described herein for the embodiment of the present invention.
After BF and AF is determined, in △ FOB, projection target can be determined by following formula according to the cosine law
The distance OF of point F to projection lens O：
OF2=OB2+FB2-2×OB×FB×COS∠ABF
It is of course also possible to determine OF by △ FOA, details are not described herein.
Pass through above description, so that it may with determine each to project in projected image target spot to projection device projection lens
Distance.
After each projection target spot to the distance of the projection lens of projection device is determined in a step 102, it can pass through
Step 103 determines each projection target spot to the ratio between the distance of the projection lens of projection device.No matter due to projected image
Size be it is how many, it is each project target spot to the ratio between the distance of the projection lens of projection device should be it is constant, such as
Fruit projected image is distorted, then each projection target spot will be sent out to the ratio between the distance of the projection lens of projection device
It is raw to change.As shown in figure 4, a kind of projected image provided in an embodiment of the present invention is distorted schematic diagram.In Fig. 4, projected image occurs
Level distortion, i.e., image inclination does not occur in vertical direction, and image occurs in the horizontal direction and tilts, and projects target spot at this time and arrives
Ratio between the distance of the projection lens of projection device can also change.Therefore, determining each projection target can be passed through
Point is set with each projection target spot to projection to the ratio between the distance of the projection lens of projection device, by the ratio determined
The default ratio of standby distance is compared, so that it is determined that whether projected image is distorted, if it is determined that projected image occurs
Distortion, can according to it is determining each of projection target spot between the distance of the projection lens of projection device ratio and default ratio
Projected image is calibrated.
The distortion of projected image each projects target spot there are many type in projected image caused by the distortion of each type
It will appear certain rule to the ratio between the distance of the projection lens of projection device, for example, occurring in projected image horizontal
When distortion, it is located at ratio and default ratio of the two projection target spots in same row pixel to the distance of the projection lens of projection device
Be worth it is identical, and positioned at two in one-row pixels projection target spots to the distance of the projection lens of projection device ratio with preset
Ratio differs.Therefore, projected image is calibrated in order to accurate and effective, projection device is determining each projection target
After point to the ratio between the distance of the projection lens of projection device, it is thus necessary to determine that the type of distortion of projected image, and according to
Type of distortion goes quickly to calculate the scaling ratio of projected image.The distortion class for how determining projected image is described below in detail
Type.
As shown in figure 5, for a kind of spatial position schematic diagram of projection device and projection target spot provided in an embodiment of the present invention.
In Fig. 5, each target spot that projects is to the default ratio between the distance of projection device：First projection target spot F1 to projection device O
The ratio of third distance OF3 of the first distance OF1 and third projection target spot F3 to projection device O be the first default ratio, the
The 4th distance OF4 of two projection target spot F2 to the second distance OF2 of projection device O and the 4th projection target spot F4 to projection device O
Ratio be the first default ratio, the first default ratio is generally 1:1 or 1:2 etc., it is determined with specific reference to actual conditions；First
The ratio of distance OF1 and second distance OF2 is that the ratio of the second default ratio, third distance OF3 and the 4th distance OF4 are second
Default ratio, the second default ratio are generally 1:1 or 1:2 etc., it is determined with specific reference to actual conditions.Certain first distance OF1,
Default ratio between second distance OF2, third distance OF3, the 4th distance OF4 can be other ratios, the present invention to this simultaneously
It does not limit.When projection target spot in projected image follows the default ratio of foregoing description to the distance between projection device, when sentencing
First distance of the disconnected first projection target spot to the projection device projects target spot to the projection device with the third
The ratio of third distance be equal to the first default ratio, it is described second projection target spot to the projection device second distance with it is described
The ratio of 4th projection target spot to the 4th distance of the projection device is equal to the described first default ratio and first distance
It is not equal to the second default ratio with the ratio of the second distance or the ratio of the third distance and the 4th distance, then really
The image fault type of the fixed projected image is level distortion；
When judging that the ratio of first distance and the second distance is equal to the described second default ratio and the third
The ratio of distance and the 4th distance is equal to the described second default ratio, and the ratio of first distance and the third distance
Value is pre- not equal to described first not equal to the described first default ratio or the second distance and the ratio of the 4th distance
If ratio, it is determined that the image fault type of the projected image is vertical distortion；
When the ratio or the second distance for judging first distance and the third distance and the 4th distance
Ratio be not equal to the described first default ratio, and the ratio of first distance and the second distance or the third away from
Ratio with a distance from the described 4th is not equal to the described second default ratio, it is determined that the image fault type of the projected image
It is distorted for mixing.
After determining the type of distortion of projected image, so that it may to determine projected image according to the type of distortion of projected image
Scaling ratio, specifically:
The image fault of projected image is determined to the ratio between the distance of the projection lens according to each projection target spot
When type is level distortion, level distortion calibration is proceeded as follows：Determine the length of each row pixel in the projected image
Degree, and the length of a wherein row pixel is determined as reference column length, the projected image is determined according to the reference column length
In each row pixel scaling ratio；
As shown in fig. 6, a kind of projected image level distortion schematic diagram provided in an embodiment of the present invention.In Fig. 6, the first projection
The ratio of the first distance OF1 of target spot F1 to projection device O and the third distance OF3 of third projection target spot F3 to projection device O
Second distance OF2 and the 4th projection target spot F4 for the first default ratio, the second projection target spot F2 to projection device O are set to projection
The ratio of the 4th distance OF4 of standby O is the ratio of the first default ratio, the first distance OF1 and second distance OF2 not equal to second
The ratio of default ratio, third distance OF3 and the 4th distance OF4 is not equal to the second default ratio, and F1, F3 are in projected image
J is arranged, and F2, F4 are in the H row of projected image, and J is less than H.At this point it is possible to determine that the projected image occurred level in Fig. 6 loses
Very.
In order to which the projected image to level distortion is calibrated, Step 1: determining the length of each row pixel in projected image
Degree：For the triangle △ being made of the projection lens O of the first projection target spot F1, third projection target spot F3, projection device
F1OF3 can determine ∠ F1OF3 and ∠ by projection lens or the first image capture device, the second image capture device
The angle of F2OF4, can be determined at this time according to the cosine law between the first projection target spot F1 and third projection target spot F3 away from
From F1F3, the distance between the projection target spots of the second projection target spot F2 and the 4th F4 F2F4 can be similarly calculated.
Assuming that the distance between the first projection target spot F1 and third projection target spot F3 F1F3 and projected image J row pixels
The ratio of total length is m, this ratio be also simultaneously the distance between the second projection target spot F2 and the 4th projection target spot F4 F2F4 and
The ratio of the total length of projected image H row pixels.Therefore the total length that can calculate projected image J row pixels isThe total length of projected image H row pixels isIt can be calculated by the following formula in projected image at this time
The length V of xth row pixelx:
Wherein, x indicates xth row pixel, and the value range of x is 1≤x≤MAX, and MAX is the columns that projected image possesses.
Step 2: the length of a wherein row pixel is determined as reference column length, institute is determined according to the reference column length
State the scaling ratio of each row pixel in projected image：
It is being determined that reference column length is VstdLater, xth row pixel in projected image can be calculated by the following formula
Scale ratio Kx：
In order to ensure that calculated scaling ratio will generally be grown without departing from the amplification limit of projection device when being calibrated
The length of shortest row pixel is spent as reference column length.
The image fault type that projected image is described below is that the calibration of projected image how is carried out when vertical distortion：
The image fault of projected image is determined to the ratio between the distance of the projection lens according to each projection target spot
When type is vertical distortion, proceeds as follows and be vertically distorted into calibration：Determine every one-row pixels in the projected image
Length, and the length of wherein one-row pixels is determined as reference row length, the perspective view is determined according to the reference row length
Scaling ratio as in per one-row pixels；
As shown in fig. 7, a kind of projected image provided in an embodiment of the present invention is vertically distorted schematic diagram.In Fig. 7, the first projection
The ratio of the first distance OF1 of target spot F1 to projection device O and the third distance OF3 of third projection target spot F3 to projection device O
Not equal to the first default ratio, the second projection target spot F2 to the second distance OF2 of projection device O and the 4th projection target spot F4 to throwing
The ratio of the 4th distance OF4 of shadow equipment O is not equal to the first default ratio, the ratio etc. of the first distance OF1 and second distance OF2
It is equal to the second default ratio in the ratio of the second default ratio, third distance OF3 and the 4th distance OF4, F1, F2 are in perspective view
The J rows of picture, F3, F4 are in the H rows of projected image, and J is less than H.At this point it is possible to determine that the projected image in Fig. 7 occurs to hang down
Straight distortion.
In order to be calibrated to the projected image being vertically distorted, Step 1: determining the length in projected image per one-row pixels
Degree：For the triangle △ being made of the projection lens O of the first projection target spot F1, third projection target spot F2, projection device
F1OF2 can determine ∠ F1OF2 and ∠ by projection lens or the first image capture device, the second image capture device
The angle of F3OF4, can be determined at this time according to the cosine law between the projections of the first projection target spot F1 and second target spot F2 away from
From F1F2, the distance between the third projection target spots of projection target spot F3 and the 4th F4 F3F4 can be similarly calculated.
Assuming that the distance between the first projection target spot F1 and the second projection target spot F2 F1F2 and projected image J row pixels
The ratio of total length is q, this ratio be also simultaneously third project the distance between target spot F3 and the 4th projection target spot F4 F3F4 and
The ratio of the total length of projected image H row pixels.Therefore the total length that can calculate projected image J row pixels isThe total length of projected image H row pixels isIt can be calculated by the following formula projected image at this time
In y row pixels length Vy:
Wherein, y indicates y row pixels, and the value range of y is 1≤y≤max, and max is the line number that projected image possesses.
Step 2: the length of wherein one-row pixels is determined as reference row length, institute is determined according to the reference row length
State the scaling ratio per one-row pixels in projected image：
It is being determined that reference row length is VstdyLater, y rows pixel in projected image can be calculated by the following formula
Scaling ratio Ky：
In order to ensure that calculated scaling ratio will generally be grown without departing from the amplification limit of projection device when being calibrated
The length of shortest one-row pixels is spent as reference column length.
The image fault of projected image is determined to the ratio between the distance of the projection lens according to each projection target spot
When type is mixing distortion, the projected image is first subjected to the level distortion calibration, then school will be carried out according to level distortion
The projected image after standard carries out the vertical distortion calibration；Alternatively, the projected image is first carried out the vertical distortion
Calibration, then the projected image after being calibrated according to vertical distortion is subjected to the level distortion calibration.It is specific how into
Row calibration can refer to above description, and details are not described herein.
For above method flow, the embodiment of the present invention also provides a kind of projection device, the particular content of the projection device
It is referred to above method implementation, details are not described herein.
As shown in figure 8, a kind of projection device structure chart provided in an embodiment of the present invention, including：
Projecting cell 801 forms projected image, wherein include in the projected image for being projected to perspective plane
Four projection target spots；
Distance measuring unit 802 each projects target spot to throwing for determining in four projection target spots described in the projected image
The distance of shadow equipment；
Alignment unit 803, for according to each projection target spot to the ratio and in advance between the distance of the projection lens
If ratio determines the scaling ratio of the projected image, and is calibrated to the projected image according to the scaling ratio.
Preferably, four projections target spot includes the first projection target spot, the second projection target spot, third projection target spot, the
Four projection target spots；
The first projection target spot is located at the second projection target point in the same one-row pixels of the projected image, described
Third projects target spot and is located in the same one-row pixels of the projected image with the 4th projection target point；
The first projection target spot is located at the third projection target point in the same row pixel of the projected image, described
Second projection target spot is located at the 4th projection target point in the same row pixel of the projected image.
Preferably, the projection device further includes the first image capture device and the second image capture device；
The distance measuring unit 802 is specifically used for：
For a projection target spot, the first image capture device in projection target spot and the projection device and the
Two image capture devices constitute a triangle, are measured in the triangle with described by described first image collecting device
First image capture device is the angle of the first interior angle of apex angle, and the triangle is measured by second image capture device
Using second image capture device as the angle of the second interior angle of apex angle in shape；
According to the angle of first interior angle, the angle of second interior angle and described first image acquisition and described the
The distance between two Image Acquisition, determine it is described projection target spot to the projection device distance.
Preferably, the alignment unit 803 is specifically used for：
The image of the projected image is determined to the ratio between the distance of the projection lens according to each projection target spot
When type of distortion is level distortion, level distortion calibration is proceeded as follows：Determine each row pixel in the projected image
Length, and the length of a wherein row pixel is determined as reference column length, the projection is determined according to the reference column length
The scaling ratio of each row pixel in image；
The image of the projected image is determined to the ratio between the distance of the projection lens according to each projection target spot
When type of distortion is vertical distortion, proceeds as follows and be vertically distorted into calibration：It determines in the projected image per a line picture
The length of element, and the length of wherein one-row pixels is determined as reference row length, the throwing is determined according to the reference row length
Scaling ratio in shadow image per one-row pixels；
The image of the projected image is determined to the ratio between the distance of the projection lens according to each projection target spot
When type of distortion is mixing distortion, the projected image is first subjected to the level distortion calibration, then will according to level distortion into
The projected image after row calibration carries out the vertical distortion calibration；Alternatively, first the projected image is carried out described vertical
Distortion calibration, then the projected image after being calibrated according to vertical distortion is subjected to the level distortion calibration.
Preferably, the alignment unit 803 in the following manner according to each projection target spot to the projection device away from
Ratio and default ratio between determine the type of distortion of the projected image:
When judging the first projection target spot to the first distance of the projection device and third projection target spot to institute
The ratio for stating the third distance of projection device is equal to the first default ratio, the second projection target spot to the of the projection device
The ratio of two distances and fourth distance of the 4th projection target spot to the projection device equal to the described first default ratio and
First distance is not equal to second with the ratio of the second distance or the ratio of the third distance and the 4th distance
Default ratio, it is determined that the image fault type of the projected image is level distortion；
When judging that the ratio of first distance and the second distance is equal to the described second default ratio and the third
The ratio of distance and the 4th distance is equal to the described second default ratio, and the ratio of first distance and the third distance
Value is pre- not equal to described first not equal to the described first default ratio or the second distance and the ratio of the 4th distance
If ratio, it is determined that the image fault type of the projected image is vertical distortion；
When the ratio or the second distance for judging first distance and the third distance and the 4th distance
Ratio be not equal to the described first default ratio, and the ratio of first distance and the second distance or the third away from
Ratio with a distance from the described 4th is not equal to the described second default ratio, it is determined that the image fault type of the projected image
It is distorted for mixing.
In conclusion the projected image calibration method and projection device that provide according to embodiments of the present invention, are thrown by measuring
Distance of the projection target spot to projection device in shadow image, it may be determined that whether projected image is distorted.When perspective view is determined
After distortion and type of distortion occurs, thrown according to each projection target spot to ratio determination is preset between the distance of projection device
The scaling ratio of shadow image, to realize the calibration to projected image.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, the present invention can be used in one or more wherein include computer usable program code computer
The shape for the computer program product implemented in usable storage medium (including but not limited to magnetic disk storage and optical memory etc.)
Formula.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
Instruct the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine so that the instruction executed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of projected image calibration method, which is characterized in that this method includes：
Projection device projects perspective plane, forms projected image, wherein includes four projection targets in the projected image
Point；
Determine the projection lens that target spot is each projected in four projection target spots described in the projected image to the projection device
Distance；
According to each projection target spot between the distance of the projection lens ratio and default ratio determine the distortion of image
Type determines the scaling ratio of the projected image according to the type of distortion of described image, and according to the scaling ratio to institute
It states projected image to be calibrated, the type of distortion of wherein described image includes：Level distortion, vertical distortion and mixing distortion.
2. the method as described in claim 1, which is characterized in that four projections target spot includes the first projection target spot, second
Project target spot, third projection target spot, the 4th projection target spot；
The first projection target spot is located at the second projection target point in the same one-row pixels of the projected image, the third
Projection target spot is located at the 4th projection target point in the same one-row pixels of the projected image；
The first projection target spot is located at the third projection target point in the same row pixel of the projected image, and described second
Projection target spot is located at the 4th projection target point in the same row pixel of the projected image.
3. the method as described in claim 1, which is characterized in that four projection target spots described in the determination projected image
In each project target spot to the projection lens of the projection device distance, including：
For a projection target spot, the projection target spot and the first image capture device and the second figure in the projection device
As collecting device one triangle of composition, measured in the triangle with described first by described first image collecting device
Image capture device is the angle of the first interior angle of apex angle, is measured in the triangle by second image capture device
Using second image capture device as the angle of the second interior angle of apex angle；
According to the acquisition of the angle of first interior angle, the angle of second interior angle and described first image and second figure
As acquisition the distance between, determine it is described projection target spot to the projection device distance.
4. method as claimed in claim 2, which is characterized in that the basis each project target spot to the projection lens away from
Ratio and default ratio between determine the type of distortion of image, and the projection is determined according to the type of distortion of described image
The scaling ratio of image, including:
The image fault of the projected image is determined to the ratio between the distance of the projection lens according to each projection target spot
When type is level distortion, level distortion calibration is proceeded as follows：Determine the length of each row pixel in the projected image
Degree, and the length of a wherein row pixel is determined as reference column length, the projected image is determined according to the reference column length
In each row pixel scaling ratio；
The image fault of the projected image is determined to the ratio between the distance of the projection lens according to each projection target spot
When type is vertical distortion, proceeds as follows and be vertically distorted into calibration：Determine every one-row pixels in the projected image
Length, and the length of wherein one-row pixels is determined as reference row length, the perspective view is determined according to the reference row length
Scaling ratio as in per one-row pixels；
The image fault of the projected image is determined to the ratio between the distance of the projection lens according to each projection target spot
When type is mixing distortion, the projected image is first subjected to the level distortion calibration, then school will be carried out according to level distortion
The projected image after standard carries out the vertical distortion calibration；Alternatively, the projected image is first carried out the vertical distortion
Calibration, then the projected image after being calibrated according to vertical distortion is subjected to the level distortion calibration.
5. method as claimed in claim 4, which is characterized in that in the following manner according to each projection target spot to the projection
Ratio and default ratio between the distance of equipment determine the type of distortion of the projected image：
When judging the first projection target spot to the first distance of the projection device and third projection target spot to the throwing
The ratio of the third distance of shadow equipment be equal to the first default ratio, it is described second projection target spot to the projection device second away from
From with the ratio with a distance from the 4th projection target spot to the 4th of the projection device equal to the described first default ratio and described
First distance and the ratio of the second distance or the ratio of the third distance and the 4th distance are default not equal to second
Ratio, it is determined that the image fault type of the projected image is level distortion；
When judging that the ratio of first distance and the second distance is equal to the described second default ratio and the third distance
It is equal to the described second default ratio with the ratio of the 4th distance, and the ratio of first distance and the third distance is not
Equal to the described first default ratio or the ratio ratio default not equal to described first of the second distance and the 4th distance
Value, it is determined that the image fault type of the projected image is vertical distortion；
When the ratio of the ratio or the second distance and the 4th distance that judge first distance and the third distance
Value is not equal to the described first default ratio, and the ratio of first distance and the second distance or the third distance with
The ratio of 4th distance is not equal to the described second default ratio, it is determined that the image fault type of the projected image is mixed
Close distortion.
6. a kind of projection device, which is characterized in that the projection device includes：
Projecting cell forms projected image for being projected to perspective plane, wherein includes four throwings in the projected image
Shadow target spot；
Distance measuring unit each projects target spot to projection device for determining in four projection target spots described in the projected image
Distance；
Alignment unit, the distortion for determining image to the ratio between the distance of the projection device according to each projection target spot
Type determines the scaling ratio of the projected image according to the type of distortion of described image, and according to the scaling ratio to institute
It states projected image to be calibrated, the type of distortion of wherein described image includes：Level distortion, vertical distortion and mixing distortion.
7. projection device as claimed in claim 6, which is characterized in that it is described four projection target spot include first projection target spot,
Second projection target spot, third projection target spot, the 4th projection target spot；
The first projection target spot is located at the second projection target point in the same one-row pixels of the projected image, the third
Projection target spot is located at the 4th projection target point in the same one-row pixels of the projected image；
The first projection target spot is located at the third projection target point in the same row pixel of the projected image, and described second
Projection target spot is located at the 4th projection target point in the same row pixel of the projected image.
8. projection device as claimed in claim 6, which is characterized in that the projection device further includes the first image capture device
And second image capture device；
The distance measuring unit is specifically used for：
For a projection target spot, the projection target spot and the first image capture device and the second figure in the projection device
As collecting device one triangle of composition, measured in the triangle with described first by described first image collecting device
Image capture device is the angle of the first interior angle of apex angle, is measured in the triangle by second image capture device
Using second image capture device as the angle of the second interior angle of apex angle；
According to the acquisition of the angle of first interior angle, the angle of second interior angle and described first image and second figure
As acquisition the distance between, determine it is described projection target spot to the projection device distance.
9. projection device as claimed in claim 7, which is characterized in that the alignment unit is specifically used for：
The image fault of the projected image is determined to the ratio between the distance of the projection lens according to each projection target spot
When type is level distortion, level distortion calibration is proceeded as follows：Determine the length of each row pixel in the projected image
Degree, and the length of a wherein row pixel is determined as reference column length, the projected image is determined according to the reference column length
In each row pixel scaling ratio；
The image fault of the projected image is determined to the ratio between the distance of the projection lens according to each projection target spot
When type is vertical distortion, proceeds as follows and be vertically distorted into calibration：Determine every one-row pixels in the projected image
Length, and the length of wherein one-row pixels is determined as reference row length, the perspective view is determined according to the reference row length
Scaling ratio as in per one-row pixels；
The image fault of the projected image is determined to the ratio between the distance of the projection lens according to each projection target spot
When type is mixing distortion, the projected image is first subjected to the level distortion calibration, then school will be carried out according to level distortion
The projected image after standard carries out the vertical distortion calibration；Alternatively, the projected image is first carried out the vertical distortion
Calibration, then the projected image after being calibrated according to vertical distortion is subjected to the level distortion calibration.
10. projection device as claimed in claim 9, which is characterized in that the alignment unit is in the following manner according to each
Projection target spot between the distance of the projection device ratio and default ratio determine the type of distortion of the projected image:
When judging the first projection target spot to the first distance of the projection device and third projection target spot to the throwing
The ratio of the third distance of shadow equipment be equal to the first default ratio, it is described second projection target spot to the projection device second away from
From with the ratio with a distance from the 4th projection target spot to the 4th of the projection device equal to the described first default ratio and described
First distance and the ratio of the second distance or the ratio of the third distance and the 4th distance are default not equal to second
Ratio, it is determined that the image fault type of the projected image is level distortion；
When judging that the ratio of first distance and the second distance is equal to the described second default ratio and the third distance
It is equal to the described second default ratio with the ratio of the 4th distance, and the ratio of first distance and the third distance is not
Equal to the described first default ratio or the ratio ratio default not equal to described first of the second distance and the 4th distance
Value, it is determined that the image fault type of the projected image is vertical distortion；
When the ratio of the ratio or the second distance and the 4th distance that judge first distance and the third distance
Value is not equal to the described first default ratio, and the ratio of first distance and the second distance or the third distance with
The ratio of 4th distance is not equal to the described second default ratio, it is determined that the image fault type of the projected image is mixed
Close distortion.
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| CN107105210A (en) * | 2017-05-25 | 2017-08-29 | 歌尔股份有限公司 | Projection correction's method and device |
| CN112327471B (en) * | 2018-10-30 | 2022-10-14 | 深圳市真迈生物科技有限公司 | Microscope system, adjusting method thereof and sequencing system |
| CN111061421B (en) * | 2019-12-19 | 2021-07-20 | 北京澜景科技有限公司 | Picture projection method and device and computer storage medium |
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