CN109743487A - A kind of ultrashort out-of-focus projection's device and its Atomatic focusing method of auto-focusing - Google Patents
A kind of ultrashort out-of-focus projection's device and its Atomatic focusing method of auto-focusing Download PDFInfo
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- CN109743487A CN109743487A CN201910081751.3A CN201910081751A CN109743487A CN 109743487 A CN109743487 A CN 109743487A CN 201910081751 A CN201910081751 A CN 201910081751A CN 109743487 A CN109743487 A CN 109743487A
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Abstract
The invention discloses a kind of ultrashort out-of-focus projection's devices of auto-focusing, including audio-video processing unit, digital optical control element, image processing unit, ultra wide-angle imaging head, power-driven focusing mechanism, ultrashort zoom lens imaging unit and power supply unit；Audio-video processing unit, for receiving, decoding, playing audio-video signal；Digital optical control element is converted to optical signal for realizing data image signal；Image processing unit, for receiving, analyzing image, control ultra wide-angle imaging head, power-driven focusing mechanism work；Ultra wide-angle imaging head, for acquiring the picture of projection；Power-driven focusing mechanism, for driving motor operations, the lens focusing ring rotation of ultrashort zoom lens imaging unit being driven to focus；Ultrashort zoom lens imaging unit, for being imaged；Power supply, for providing voltage required when projection arrangement works normally, electric current.The present invention also provides a kind of Atomatic focusing methods of ultrashort out-of-focus projection's device of auto-focusing；The present invention is easy to use, and system is succinct, reliable performance.
Description
Technical field
The present invention relates to projection display technique field, ultrashort out-of-focus projection's device of especially a kind of auto-focusing and its automatic
Focusing method.
Background technique
Ultrashort zoom lens project the advantage of ratio because of it, have been widely used on home projector, engineering projection arrangement.Mesh
Before, it has been able to achieve auto-focusing in middle focal length projection device, and be equipped with the projection arrangement imaging definition of ultrashort zoom lens
Adjustment also needs observer's viewing projected picture to adjust in real time.
Generally, laser television product is equipped with ultrashort burnt imaging lens, and hundred inch picture can be projected apart from half meter of screen or so
Face.If about 2-3 meters of the distance between camera and screen could shoot complete shadowgraph using the camera of small angle
Face, user is inconvenient to use, and can not be built in laser television；If using bugeye lens camera, (visual angle is greater than 150
Degree), apart from half meter of screen, face picture, complete projected picture can be shot, but the picture shot has barrel distortion.If will
Bugeye lens camera is placed within laser projection device, and camera, which need to rotate greater obliquity, could shoot complete picture, is removed
Outside barrel distortion, the oblique distortions as caused by high inclination-angle shooting influence the judgement of image definition very much.
Summary of the invention
To solve problems of the prior art, the object of the present invention is to provide a kind of easy, low cost, height
The integrated ultrashort out-of-focus projection's device and its Atomatic focusing method with auto-focusing.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of ultrashort out-of-focus projection's device of auto-focusing, packet
Include audio-video processing unit, digital optical control element, image processing unit, ultra wide-angle imaging head, power-driven focusing mechanism, super short-focus mirror
Head imaging unit and power supply unit；
The audio-video processing unit, for receiving, decoding, playing audio-video signal；
The number optical control element, is converted to optical signal for realizing data image signal；
Described image processing unit, for receiving, analyzing image, control ultra wide-angle imaging head, power-driven focusing mechanism work；
Specifically include image flame detection module, characteristic image element extraction module and clarity analysis module；Wherein, described image corrects mould
Block is used for the distortion of correcting image, and the characteristic image element extraction module from complete image for extracting local characteristic pattern
Pixel element；The clarity analysis module is used to analyze the clarity situation of characteristic image element；
The ultra wide-angle imaging head, for acquiring the picture of projection；
The power-driven focusing mechanism, the lens focusing ring for driving motor operations, driving ultrashort zoom lens imaging unit
Rotation is focused；
The ultrashort zoom lens imaging unit, for being imaged；
The power supply, for providing voltage required when projection arrangement works normally, electric current.
As a preferred embodiment, the characteristic image element is lines, character, concentric circles or irregular component
Shape.
As another preferred embodiment, the ultra wide-angle imaging head is built in ultrashort out-of-focus projection's device,
Shooting visual angle is more than or equal to 150 degree, and camera lens axis center and the normal direction of screen have certain angle.
As another preferred embodiment, the focusing function projection ratio of the ultrashort zoom lens imaging unit is less than
0.24。
As another preferred embodiment, image processing unit DSP.
The present invention also provides a kind of Atomatic focusing methods of ultrashort out-of-focus projection's device of auto-focusing as described above, call
When automatic focusing function, ultrashort out-of-focus projection's device output is automatic to focus picture, specifically includes the following steps:
Step 1, image processing unit read parameter from data storage: the camera lens axis center and screen of ultra wide-angle imaging head
Normal angle A, the clarity gate valve value N of curtain；
Step 2, image processing unit control ultra wide-angle imaging head work, acquire Current projection picture P；
Step 3, image processing unit figure rectification module gray processing processing is first carried out to the picture P of acquisition, obtain ash
Degree figure H；Oblique distortions correction is carried out to grayscale image H according to normal angle A again, obtains image J；Then image J is carried out barrel-shaped
Distortion correction obtains image K；
Step 4, the characteristic image element extraction module of image processing unit carry out characteristic element extraction to image K, obtain
Characteristic pattern series T1, T2, T3 ... Tn；
Step 5, the clarity analysis module of image processing unit are analyzed every characteristic pattern T1, T2, T3 ... Tn, are obtained
It is weighted summation to clarity Q1, Q2, Q3 ... Qn, and by projected picture position locating for every characteristic pattern, is entirely projected
The definition values Q-all of picture；
When Q-all is more than or equal to clarity gate valve value N, projected picture is clear, and automatic focus terminates；When Q-all is less than
When clarity gate valve value N, it is clear that projected picture is smudgy, and image processing unit controls power-driven focusing mechanism, the super short-focus mirror of rotation
The focusing ring of head repeats step 2- step 5.
The beneficial effects of the present invention are: ultrashort out-of-focus projection's device provided by the invention with automatic focusing function, with super
Wide-angle camera acquires picture, in conjunction with image flame detection, realizes clarity analysis and the automatic focusing function of projected picture, solves
Large volume, it is difficult integrated the problems such as.Ultrashort out-of-focus projection's device with automatic focusing function of the invention is easy to use, system letter
Clean, reliable performance.
Detailed description of the invention
Fig. 1 is the system block diagram of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the embodiment of the present invention；
Fig. 3 is the automatic focusing picture in the embodiment of the present invention comprising 5 groups of characteristic image elements.
Appended drawing reference: 1, ultrashort zoom lens imaging unit, 2, ultra wide-angle imaging head.
Specific embodiment
The embodiment of the present invention is described in detail with reference to the accompanying drawing.
Embodiment 1
As shown in Figure 1, a kind of ultrashort out-of-focus projection's device of auto-focusing, including audio-video processing unit, the light-operated list of number
Member, image processing unit, ultra wide-angle imaging head, power-driven focusing mechanism, ultrashort zoom lens imaging unit, power supply unit；The sound
Video processing unit, for receiving, decoding, playing audio-video signal；The number optical control element, for realizing digital picture letter
Number be converted to optical signal；Described image processing unit, for receiving, analyzing image, control ultra wide-angle imaging head, electromotion focusing dress
Set work；The ultra wide-angle imaging head, for acquiring the picture of laser projection device projection；The power-driven focusing mechanism, is used for
It drives motor operations, drive the rotation of lens focusing ring；The ultrashort zoom lens imaging unit, for being imaged；The power supply, is used for
Voltage, electric current needed for projection arrangement works normally are provided.
Specifically, image processing unit includes image flame detection module, characteristic image element extraction module, clarity analysis mould
Block etc.；Wherein image flame detection module distorts for correcting image；Characteristic image element extraction module, for from complete image
Extraction part, specific pictorial element, i.e. characteristic image element；Clarity analysis module, for analyzing characteristic image element
Clarity situation.
Specifically, characteristic image element can be some lines, character, can be one group of concentric circles, is also possible to
Irregular figure.
Specifically, ultra wide-angle imaging head is built in ultrashort out-of-focus projection's device, and shooting visual angle is at 150 degree or more, camera lens
Axis center and the normal direction of screen have certain angle, can shoot complete projected picture.
Specifically, the camera lens of ultrashort zoom lens imaging unit has focusing function, and projects ratio less than 0.24.
Specifically, image processing unit DSP.
Embodiment 2
As shown in Fig. 2, a kind of Atomatic focusing method of ultrashort out-of-focus projection's device of auto-focusing as described in Example 1,
When calling automatic focusing function, ultrashort out-of-focus projection's device output is automatic to focus picture, specifically includes the following steps:
Step 1, image processing unit reads parameter from data storage: the camera lens axis center of ultra wide-angle imaging head 2 with
Normal angle A, the clarity gate valve value N of screen；
Step 2, image processing unit control ultra wide-angle imaging head 2 works, and acquires Current projection picture P；
Step 3, the figure rectification module of image processing unit first carries out gray processing processing to the picture P of acquisition, obtains ash
Degree figure H；Oblique distortions correction is carried out to grayscale image H according to included angle A again, obtains image J；Then barrel distortion is carried out to image J
Correction obtains image K；
Step 4, the characteristic image element extraction module of image processing unit carries out characteristic element extraction to image K, obtains
Characteristic pattern series T1, T2, T3, T4, T5；
Step 5, the clarity analysis module of image processing unit every characteristic pattern T1, T2, T3, T4, T5 are analyzed,
It obtains clarity Q1, Q2, Q3, Q4, Q5, and is weighted by the position T1, T2, T3, T4, T5 that (center weight is 1, upper left
Angle, upper right corner weight are 0.8, and the lower left corner, lower right corner weight are 0.8, and other positions weight is 0.9), to obtain entire projected picture
Definition values Q-all.
When Q-all is more than or equal to clarity gate valve value N, projected picture is clear, and auto-focusing terminates；When Q-all is less than
When clarity gate valve value N, it is clear that projected picture is smudgy, and image processing unit controls power-driven focusing mechanism, the super short-focus mirror of rotation
The focusing ring of head repeats step 2- step 5.
In the present embodiment, image processing unit DSP.
In the present embodiment, the visual angle of ultra wide-angle imaging head 2 is 150 degree.
In the present embodiment, it is 0.23 that the projection of ultrashort zoom lens imaging unit 1, which is compared,.
After the projection device works normally, projected picture is substantially rectangular, when calling automatic focusing function, ultrashort burnt throwing
Image device output automatic focusing picture as shown in Figure 3.
A specific embodiment of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.
Claims (6)
1. a kind of ultrashort out-of-focus projection's device of auto-focusing, which is characterized in that including audio-video processing unit, the light-operated list of number
Member, image processing unit, ultra wide-angle imaging head, power-driven focusing mechanism, ultrashort zoom lens imaging unit and power supply unit；
The audio-video processing unit, for receiving, decoding, playing audio-video signal；
The number optical control element, is converted to optical signal for realizing data image signal；
Described image processing unit, for receiving, analyzing image, control ultra wide-angle imaging head, power-driven focusing mechanism work；Specifically
Including image flame detection module, characteristic image element extraction module and clarity analysis module；Wherein, described image rectification module is used
In the distortion of correcting image, the characteristic image element extraction module from complete image for extracting local characteristic pattern pixel
Element；The clarity analysis module is used to analyze the clarity situation of characteristic image element；
The ultra wide-angle imaging head, for acquiring the picture of projection；
The power-driven focusing mechanism, the lens focusing ring rotation for driving motor operations, driving ultrashort zoom lens imaging unit
It focuses；
The ultrashort zoom lens imaging unit, for being imaged；
The power supply, for providing voltage required when projection arrangement works normally, electric current.
2. ultrashort out-of-focus projection's device of auto-focusing according to claim 1, which is characterized in that the characteristic image element
For lines, character, concentric circles or irregular figure.
3. ultrashort out-of-focus projection's device of auto-focusing according to claim 1, which is characterized in that the ultra wide-angle imaging head
It is built in ultrashort out-of-focus projection's device, shooting visual angle is more than or equal to 150 degree, and camera lens axis center and the normal direction of screen have one
Fixed angle.
4. ultrashort out-of-focus projection's device of auto-focusing according to claim 1, which is characterized in that the ultrashort zoom lens at
As the focusing function projection ratio of unit is less than 0.24.
5. ultrashort out-of-focus projection's device of auto-focusing according to claim 1, which is characterized in that image processing unit is
DSP。
6. a kind of Atomatic focusing method of ultrashort out-of-focus projection's device of auto-focusing as described in claim 1, which is characterized in that
When calling automatic focusing function, ultrashort out-of-focus projection's device output is automatic to focus picture, specifically includes the following steps:
Step 1, image processing unit read parameter from data storage: the camera lens axis center of ultra wide-angle imaging head and screen
Normal angle A, clarity gate valve value N；
Step 2, image processing unit control ultra wide-angle imaging head work, acquire Current projection picture P；
Step 3, image processing unit figure rectification module gray processing processing is first carried out to the picture P of acquisition, obtain grayscale image
H；Oblique distortions correction is carried out to grayscale image H according to normal angle A again, obtains image J；Then barrel distortion is carried out to image J
Correction obtains image K；
Step 4, the characteristic image element extraction module of image processing unit carry out characteristic element extraction to image K, obtain feature
Scheme series T1, T2, T3 ... Tn；
Step 5, the clarity analysis module of image processing unit are analyzed every characteristic pattern T1, T2, T3 ... Tn, are obtained clearly
Clear degree Q1, Q2, Q3 ... Qn, and it is weighted summation by projected picture position locating for every characteristic pattern, obtain entire projected picture
Definition values Q-all；
When Q-all is more than or equal to clarity gate valve value N, projected picture is clear, and automatic focus terminates；When Q-all is less than clearly
When spending gate valve value N, it is clear that projected picture is smudgy, and image processing unit controls power-driven focusing mechanism, rotates ultrashort zoom lens
Focusing ring repeats step 2- step 5.
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| CN110324596A (en) * | 2019-07-30 | 2019-10-11 | 歌尔股份有限公司 | Clarity detection method and detection device |
| CN112505994A (en) * | 2020-12-11 | 2021-03-16 | 四川长虹电器股份有限公司 | Ultra-short focus projection system and automatic focusing method thereof |
| CN113867092A (en) * | 2021-08-19 | 2021-12-31 | 闽南理工学院 | Novel intelligent adjustment and calibration system for curved-surface reflection cup of ultra-short-focus display lens |
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Application publication date: 20190510 |