CN209120360U - Optical projection system - Google Patents
Optical projection system Download PDFInfo
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- CN209120360U CN209120360U CN201821671374.6U CN201821671374U CN209120360U CN 209120360 U CN209120360 U CN 209120360U CN 201821671374 U CN201821671374 U CN 201821671374U CN 209120360 U CN209120360 U CN 209120360U
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- focusing area
- projector
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- distance
- lens module
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Abstract
The utility model proposes a kind of optical projection systems.Optical projection system includes: projector, has lens module and image is projected to view field along optical axis direction；Image capture unit captures the pick-up image including view field；And processor.Pick-up image is divided into multiple focusing areas by processor, and controls stepper motor to the mobile focusing of the focusing area at edge, to obtain the step number and distance that each focusing area has the maximum stepper motor being clearly worth.Projector distance of the distance between lens module and focusing area.Processor calculates the optical axis direction of projector and the angle of view field according to the distance of the focusing area at edge, and carries out deformation operation to projected picture according to angle.
Description
Technical field
The utility model relates to a kind of optical projection system, and carries out school to projected picture automatically in particular to a kind of
Positive optical projection system.
Background technique
It will cause throwing when projected picture is projected to projection screen by projector, when rotating horizontally to the left or to the right to projector
Shadow picture becomes trapezoidal by rectangle.As shown in Figure 1A to 1D, if projector 100 is rotated horizontally to the right, projected picture 200
The trapezoidal of left short right length can be presented.When Figure 1A is that projection angle θ is presented vertical in top view and side view, projected picture
200 schematic diagram.Figure 1B is the top view of corresponding diagram 1A.When Fig. 1 C is that projection angle θ is not presented vertical in a top view, projection
The schematic diagram of picture 200.Fig. 1 D is the top view of corresponding diagram 1C.Become horizontal for projected picture 200 in Fig. 1 C trapezoidal to ask
Topic, user usually require to judge to adjust projected picture 200 to square by naked eyes using manual horizontal ladder shape calibration function
Shape.It is worth noting that, the projection angle θ of Figure 1B and Fig. 1 D represents optical axis direction and the throwing of the lens module of projector 100
The horizontal sextant angle (that is, angle in top view) of shadow curtain 250.
When projected picture is projected to projection screen by projector, to projector upward or downward vertical rotary when will also result in
Projected picture becomes trapezoidal.As shown in Fig. 2A to 2D, if by the upward vertical rotary of projector 100, projected picture 200 can be presented
Under short upper length it is trapezoidal.Fig. 2A is projection angle θ when top view and side view are all presented vertical, the signal of projected picture 200
Figure.Fig. 2 B is the side view of corresponding diagram 2A.When Fig. 2 C is that projection angle θ is not presented vertical in side view, projected picture 200
Schematic diagram.Fig. 2 D is the side view of corresponding diagram 2C.Aiming at the problem that projected picture 200 becomes vertical trapezium in Fig. 2 C, usually
The angle of projector 100 and ground can be detected by gravity sensor (Gravity Sensor, G-Sensor).It hangs down in projection screen
In the case where straight ground, projection angle θ can be easily computed to carry out corresponding vertical keystone correction function.It is worth noting
, the projection angle θ of Fig. 2 B and Fig. 2 D represent the lens module of projector 100 optical axis direction and projection screen 250 hang down
Straight angle (that is, angle in side view).
General projector can select best projection angle when setting up to put and (projection angle and throw for example, allowing as far as possible
Shadow curtain is vertical) so that rectangle is presented in projected picture.It is put however, being limited to space problem sometimes and may need to tilt projector
It puts.At this point, user must just correct the problem of picture deformation to obtain correct projected picture.
In addition, it is directed to horizontal keystone correction or vertical keystone correction, it can also be by two groups of distance measuring modules (for example, thunder
Penetrate, ultrasonic or infrared module) carry out projector lens to projected picture left side and right side distance measuring.However, laser
The ranging range of module is too short, does not meet the practical application distance of the projector generally projected from front.Ultrasonic or infrared ray
The volume of module is big and is unsuitable for small projector.Therefore, how projected picture to be corrected automatically additional without being arranged
Element is the target that those skilled in the art should endeavour.
Utility model content
The utility model provides a kind of optical projection system, can be corrected automatically to projected picture.
The utility model proposes a kind of optical projection systems, including projector, image capture unit and processor.Projector has
Lens module.Lens module includes stepper motor.Lens module has optical axis.Projector is used to project image along optical axis direction
To view field.Image capture unit is for capturing the pick-up image including view field.Processor is couple to projector and shadow
As capture device.Pick-up image is divided into multiple focusing areas by processor, and controls stepper motor to the side of at least view field
The mobile focusing of the focusing area of edge, to obtain the step number for the stepper motor for corresponding to each focusing area at a distance from corresponding step number.
Each focusing area is greater than the image under other step numbers of stepper motor in the clear value of the image under the step number of stepper motor
Clear value.Projector distance of the distance between lens module and each focusing area.Processor is according to the edge of view field
Multiple distances of focusing area calculate the optical axis directions of projector and the angles of view field, and according to angle to projected picture
Carry out deformation operation.
Based on above-mentioned, the optical projection system of the utility model can capture the pick-up image greater than view field and by pick-up image
It is divided into multiple focusing areas.Processor is at least to the mobile focusing of the focusing area at the edge of view field to obtain each focusing area
The step number of domain is clearly worth stepper motor corresponding when being maximum, then step number is converted to the camera lens mould of focusing area and projector
The distance of block.Finally, processor calculates at a distance from the lens module of projector according to the focusing area at the edge of view field
The angle of the optical axis direction of projector and view field out carries out deformation operation to projected picture further according to this angle.
In order to make the above-mentioned features and advantages of the utility model more obvious and understandable, special embodiment below, and cooperate attached drawing
It is described in detail below.
Detailed description of the invention
Figure 1A to Fig. 1 D is the schematic diagram of known projector horizontal rotation and projected picture.
Fig. 2A to Fig. 2 D is the schematic diagram of known projector's vertical rotary and projected picture.
Fig. 3 is the block diagram according to the projector system of an embodiment of the present invention.
Fig. 4 is that pick-up image is divided into multiple focusing areas according to the trapezoidal distortion correction method of an embodiment of the present invention
Schematic diagram.
Fig. 5 is the schematic diagram according to the trapezoidal distortion correction method projected focus pattern of an embodiment of the present invention.
Fig. 6 is the flow chart according to the auto-focusing algorithm of an embodiment of the present invention.
Fig. 7 is the top view rotated horizontally according to the projector of an embodiment of the present invention.
Fig. 8 and Fig. 9 is the schematic diagram according to auto-focusing after the projection correction of an embodiment of the present invention.
Specific embodiment
Fig. 3 is the block diagram according to the projector system of an embodiment of the present invention.
Referring to figure 3., the projector system 300 of the utility model includes projector 310.Projector 310 picks including image
Take device 320, processor 330, imaging unit 340, lens module 350 and signal input unit 360.Image capture unit 320
E.g. complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) shadow
As sensor, charge-coupled device (Charge Coupled Device, CCD) Image Sensor or other similar element.Processing
Device 330 is, for example, micro-control unit (Micro Control Unit, MCU), microprocessor (Microprocessor), number
Signal processor (Digital Signal Processor, DSP), image processor or other similar element and combinations thereof.At
As unit 340 is, for example, reflective liquid crystal on silicon (Liquid Crystal on Silicon, LCOS) or digital micro-mirror member
Part (Digital Micro-mirror Device, DMD) etc.；The spatial light modulator of transmission-type, such as light transmitting liquid crystal panel
(Transparent Liquid Crystal Panel)；Light-emitting display panel, such as organic light emitting diode display panel
(Organic light emitting diode display Panel)。
In this present embodiment, image can be formed by imaging unit 340, be projected further along the optical axis direction of lens module 350
To view field 380.Lens module 350 may include stepper motor (not being illustrated in figure).320 fechtable packet of image capture unit
Include the pick-up image 390 of view field 380.That is the area of pick-up image 390 can be bigger than the area of view field 380.
In one embodiment, image capture unit 320 is configured at projector 310 and neighbour sets lens module 350, wherein image capture unit
320 optical axis direction is parallel to the optical axis direction of lens module 350, but not limited to this.In other embodiments, image capture
Device 320 is configured in the other positions of projector 310 or is set to outside projector 310, as long as image capture unit 320 can be picked
Take the pick-up image 390 including view field 380.Signal input unit 360 can receive source image signal, and source
Video signal can be converted into the accessible data formats of processor 330, and then pass through imaging unit 340 and lens module 350
Project to view field 380.View field 380 is e.g. for projection on projection screen, on a face wall or at other
In plane.
Fig. 4 is that pick-up image is divided into multiple focusing areas according to the trapezoidal distortion correction method of an embodiment of the present invention
Schematic diagram.Fig. 5 is the schematic diagram according to the trapezoidal distortion correction method projected focus pattern of an embodiment of the present invention.Fig. 6 is root
According to the flow chart of the auto-focusing algorithm of an embodiment of the present invention.
Please with reference to Fig. 4 and Fig. 5, pick-up image 390 first can be divided into multiple focusing areas by processor 330, such as right
Burnt region 391 arrive focusing area 397, and by imaging unit 340 formed image after, by lens module 350 by image along mirror
The optical axis direction of head module 350 projects to view field 380, wherein the image includes focusing patterns 500.It is noticeable
It is that the focusing patterns of Fig. 5 are only illustrative purposes, also other kinds of focusing patterns of projectable in other embodiments, such as
At least in the edge projection focusing patterns of view field 380.Then, stepper motor is controlled at least projecting by processor 330
The mobile focusing of these focusing areas at the edge in region, step when the clear value to obtain the image in each focusing area is maximum
Into motor step number at a distance from the corresponding step number.Wherein, the clear value maximum refers to each focusing area in stepping horse
The clear value of image under the step number reached is greater than the clear value of the image under other step numbers of stepper motor.In this implementation
Example in, processor 330 need to obtain the image in each focusing area 391~397 clear value be maximum when, each focusing area
The step number of stepper motor corresponding to 391~397.Specifically, the auto-focusing algorithm of each focusing area 391~397
Process is as shown in Figure 6.
Fig. 6 is please referred to, in step s 601, starts auto-focusing.
In step S602, the clear value of the image in focusing area is obtained from lens module 350.
In step S603, if found maximum clear value.
If being much to seek maximum clear value adjusts the step number of stepper motor in step s 604, and returns to step S602.
If having found maximum clear value, in step s 605, the step number of the corresponding maximum stepper motor being clearly worth is recorded.
In step S606, auto-focusing is completed.
In the present embodiment, processor 330 only needs to control stepper motor from starting step number to be moved to final step number primary,
The step number of stepper motor corresponding when the clear value of each focusing area 391~397 is maximum can be obtained one by one.Implement one
In example, the starting step number and final step number of stepper motor can respectively correspond farthest focal distance and nearest focal distance.Another
In one embodiment, the starting step number and final step number of stepper motor can respectively correspond nearest focal distance and farthest focusing
From.
The corresponding stepping horse when the clear value that processor 330 obtains the image of each focusing area 391~397 is maximum
After the step number reached, processor 330 can obtain each focusing area 391~397 and mirror according to the step number stored in advance apart from table
The distance between head module 350 (that is, projector distance).Step number is apart from the step number pass corresponding with distance that table can record stepper motor
System.Above-mentioned distance can be considered the predetermined point (for example, central point) of each focusing area 391~397 to the one pre- of lens module 350
Pinpoint the distance of (for example, optical axis center point or optical center point of lens module 350).
It is worth noting that, although above embodiments illustrate to carry out stepper motor mobile focusing to obtain all focusings
The step number and projector distance of the corresponding stepper motor in region 391~397, but the utility model is not limited thereto.In another reality
It applies in example, processor 330 can also only obtain the corresponding stepper motor of focusing area 391~396 at 380 edge of view field
Step number and projector distance.In this way, when pick-up image 390 is divided into more focusing areas and carries out subsequent meter by processor 330
When calculation, a large amount of calculating time can be saved.
Fig. 7 is the top view rotated horizontally according to the projector of an embodiment of the present invention.
After obtaining the corresponding projector distance of each focusing area 391~397, processor 330 can calculate lens module 350
The horizontal sextant angle α of optical axis direction and view field 380 (that is, projection plane where view field 380).
Specifically,
It can be derived from from two above equation:
Wherein,WithLength can respectively correspond in Fig. 4 the focusing area of neighbouring 380 left edge of view field
The focusing area 394 (that is, right focusing area) of 393 (that is, left focusing areas) and neighbouring 380 right hand edge of view field arrives camera lens
The distance of module 350, therefore can table look-up and obtain apart from table from step number.β is between the maximum light-emitting angle of lens module 350 and optical axis
Folded angle, since the maximum light-emitting angle of lens module 350 will receive the influence of light source Yu lens module 350, and projector
310 have determined that selected light source and lens module 350 when factory, therefore β can be the factory setting value of projector 310.Cause
This, processor 330 can be according to horizontal sextant angle α to the horizontal trapezoidal school of 380 progress of view field after acquiring horizontal sextant angle α
Just.
Similar to horizontal keystone correction method, processor 330 can also calculate optical axis direction and the projected area of lens module 350
The vertical angle in domain 380 carries out vertical keystone correction to view field 380 further according to vertical angle.Processor 330 can be according to right
Burnt region 391 (that is, upper focusing area) is counted at a distance from focusing area 395 (that is, lower focusing area) to lens module 350
Vertical angle is calculated, or camera lens is arrived according to focusing area 392 (that is, upper focusing area) and focusing area 396 (that is, lower focusing area)
The distance of module 350 calculates vertical angle.In simple terms, processor 330 can be according to the left focusing area for being located at same level
Domain and right focusing area calculate horizontal sextant angle to the distance of lens module 350, and according to the upper focusing area of same vertical plane
And lower focusing area calculates vertical angle to the distance of lens module 350.When pick-up image 390 is divided into more by processor 330
When more focusing areas, calculated horizontal sextant angle α and/or vertical angle will be more accurate.
When processor 330 calculates horizontal sextant angle α and/or vertical angle, processor 330 can according to horizontal sextant angle α and/
Or vertical angle carries out deformation operation to source image signal to be projected out the projected picture of rectangle on projection screen.
Fig. 8 and Fig. 9 is the schematic diagram according to auto-focusing after the projection correction of an embodiment of the present invention.
Fig. 8 and Fig. 9 is please referred to, after having executed horizontal keystone correction and/or vertical keystone correction, if projector 310 is still
Make auto-focusing (for example, focusing according to the central point A of imagery zone 880 before correcting), meeting to correct preceding imagery zone 880
Cause imagery zone 881 after the correction with central point A ' out of focus.Wherein, the periphery of imagery zone 880 is that image is picked before correcting
Take the pick-up image 890 of device 320.Therefore, processor 330 can be thrown after horizontal keystone correction and/or vertical keystone correction
One focusing picture of shadow imagery zone 881 after calibration, as shown in figure 9, allowing imagery zone after the detecting correction of lens module 350
It simultaneously focuses to this focusing picture position.In this way, which projected picture can be solved by horizontal keystone correction and/or vertical ladder
Problem out of focus after the deformation operations such as shape correction.
In conclusion the optical projection system of the utility model can capture the pick-up image greater than view field and by pick-up image
It is divided into multiple focusing areas.Processor at least to the focusing area at the edge of view field by the mobile focusing of stepper motor with
It obtains the step number of stepper motor corresponding when the clear value of the image of each focusing area is maximum, then step number is converted to pair
Burnt region is at a distance from the lens module of projector.Finally, focusing area and projection of the processor according to the edge of view field
The distance of the lens module of machine calculates the optical axis direction of projector and the angle of view field, further according to this angle to shadowgraph
Face carries out deformation operation.After carrying out deformation operation to projected picture, processor can also carry out weight to deformed projected picture
New focusing, to avoid incorrect problem of focusing after deformation operation.
Although the utility model is disclosed above with embodiment, so it is not intended to limit the utility model, any ability
Field technique personnel, without departing from the spirit and scope of the utility model, when can make a little change and modification, therefore this is practical new
Subject to the protection scope of type ought be defined depending on appended claims.
Description of symbols
100: projector
200: projected picture
250: projection screen
300: optical projection system
310: projector
320: image capture unit
330: processor
340: imaging unit
350: lens module
360: signal input unit
380: view field
390: pick-up image
391~397: focusing area
500: focusing patterns
S601~S606: auto-focusing algorithm process
880: imagery zone before correcting
881: imagery zone after correction
890: pick-up image
α: horizontal sextant angle
β: folded angle between lens module maximum light-emitting angle and optical axis.
Claims (6)
1. a kind of optical projection system, which is characterized in that the optical projection system includes projector, image capture unit and processor,
Wherein:
The projector has lens module, and the lens module includes stepper motor, wherein the lens module has light
Axis, the projector are used to image projecting to view field along the optical axis direction；
The image capture unit is for capturing the pick-up image including the view field；And
The processor is couple to the projector and the image capture unit, wherein
The pick-up image is divided into multiple focusing areas by the processor, and controls the stepper motor at least described projection
The mobile focusing of the multiple focusing area at the edge in region, to obtain the institute of each of corresponding the multiple focusing area
The step number of stepper motor is stated at a distance from the corresponding step number, wherein each of the multiple focusing area is in the stepping
The clear value of the image under the step number of motor is greater than the image under other step numbers of the stepper motor
Clear value, projector distance of the distance between each of the lens module and the multiple focusing area,
The processor is according to multiple distance calculating of the multiple focusing area at the edge of the view field
The optical axis direction of projector and the angle of the view field, and the projected picture is deformed according to the angle
Operation.
2. optical projection system according to claim 1, which is characterized in that the lens module is to the institute after the deformation operation
Projected picture is stated to be focused again.
3. optical projection system according to claim 1, which is characterized in that the multiple focusing area includes the neighbouring projection
The right focusing area of the left focusing area of the left edge in region and the right hand edge of the neighbouring view field, and the processor root
According between the left focusing area and the lens module the distance and the right focusing area and the lens module it
Between the distance calculate the optical axis direction of the projector and the horizontal sextant angle of the view field, and according to the water
Flat angle carries out the deformation operation to the projected picture.
4. optical projection system according to claim 1, which is characterized in that the multiple focusing area includes the neighbouring projection
The lower focusing area of the upper focusing area of the top edge in region and the lower edge of the neighbouring view field, and the processor root
According between the upper focusing area and the lens module the distance and the lower focusing area and the lens module it
Between the distance calculate the optical axis direction of the projector and the vertical angle of the view field, and hung down according to described
Straight angle carries out the deformation operation to the projected picture.
5. optical projection system according to claim 1, which is characterized in that the processor according to step number apart from table to obtain
State the distance of the corresponding step number of each of multiple focusing areas.
6. optical projection system according to claim 1, which is characterized in that the image includes focusing patterns, and the focusing
Pattern is displayed at least the edge of the view field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821671374.6U CN209120360U (en) | 2018-10-16 | 2018-10-16 | Optical projection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821671374.6U CN209120360U (en) | 2018-10-16 | 2018-10-16 | Optical projection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209120360U true CN209120360U (en) | 2019-07-16 |
Family
ID=67201020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821671374.6U Active CN209120360U (en) | 2018-10-16 | 2018-10-16 | Optical projection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209120360U (en) |
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2018
- 2018-10-16 CN CN201821671374.6U patent/CN209120360U/en active Active
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