CN106534633A - Combined photographing system, mobile terminal and image processing method - Google Patents

Combined photographing system, mobile terminal and image processing method Download PDF

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Publication number
CN106534633A
CN106534633A CN201610958484.XA CN201610958484A CN106534633A CN 106534633 A CN106534633 A CN 106534633A CN 201610958484 A CN201610958484 A CN 201610958484A CN 106534633 A CN106534633 A CN 106534633A
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China
Prior art keywords
image
camera head
light
laser
projection device
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Pending
Application number
CN201610958484.XA
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Chinese (zh)
Inventor
黄源浩
刘龙
肖振中
许星
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Shenzhen Orbbec Co Ltd
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Shenzhen Orbbec Co Ltd
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Priority to CN201610958484.XA priority Critical patent/CN106534633A/en
Publication of CN106534633A publication Critical patent/CN106534633A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/90Arrangement of cameras or camera modules, e.g. multiple cameras in TV studios or sports stadiums
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50Constructional details
    • H04N23/55Optical parts specially adapted for electronic image sensors; Mounting thereof
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/31Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Studio Devices (AREA)
  • Image Input (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The invention discloses a combined photographing system, a mobile terminal and an image processing method. The combined photographing system comprises a first photographing device, a second photographing device, a laser projection device and a processor. The laser projection device is used for projecting a structured light pattern of invisible laser to a shared field of view of the first photographing device and the second photographing device. The first photographing device is used for collecting a first visible light color image in the shared field of view. The second photographing device is used for collecting a visible light gray image in the shared field of view. One of the first photographing device and the second photographing device is used for collecting an invisible light image in the shared field of view. The processor is used for synthesizing the first visible light color image and the visible light gray image into a second visible light color image and calculating a depth image through utilization of the invisible light image. According to the system, the mobile terminal and the method, the target high-quality color image and the depth image can be collected with a small size and lower power consumption.

Description

A kind of combination shot system, mobile terminal and image processing method
【Technical field】
The present invention relates to optical measurement and electronic applications, more particularly to a kind of combination shot system, mobile terminal and image Processing method.
【Background technology】
RGB image is able to record that the color characteristic of object, has been widely used in terms of pattern recognition, such as people Face identification, Articles detecting etc..Recently as the development of depth survey technology, the development of structured light technique is based particularly on, profit Further carry out the applications such as motion sensing manipulation, 3D reconstructions, tracking and avoidance also gradually to obtain with depth camera Measuring Object depth information To attention.
Color camera is equipped with the computing device and depth camera causes equipment to have more extensive function, but consider To mobile device as, in mobile phone, the less computing device of flat board equal-volume, many cameras of setting are unadvisable, are on the one hand occupied Substantial amounts of space;On the other hand also bring along bigger power consumption.
【The content of the invention】
In order to overcome the deficiencies in the prior art, the invention provides at a kind of combination shot system, mobile terminal and image Reason method, realizes high-quality Color Image Acquisition and depth image collection with fewer resource.
A kind of combination shot system, including the first camera head, the second camera head, laser projection device and processor;
The laser projection device is used for, and the total visual field to first camera head and the second camera head projects not The structured light patterns of visible laser;
First camera head is used for, and gathers the first otherwise visible light color image in the total visual field;
Second camera head is used for, and gathers the visible ray gray level image in the total visual field;
One of first camera head and the second camera head be additionally operable to gather in the total visual field can not See light image;
The processor is used for, visible using first otherwise visible light color image and the synthesis second of visible ray gray level image Light coloured image, and depth image is calculated using the black light image.
Preferably, the laser projection device is used for alternately projecting the structured light patterns and pass to the total visual field Close the projection structured light patterns;
Gathering one of described black light image in first camera head and the second camera head is used for, described Laser projection device gathers the first black light image during projecting the structured light patterns, closes in the laser projection device The second black light image is gathered during projecting the structured light patterns;
The processor is used for, using the first black light image and the difference image meter of the second black light image Calculate the depth image.
Preferably, project in the cycle of the structured light patterns in the laser projection device alternating projection and closing, throw The duration of the structured light patterns is penetrated more than the duration for closing the projection structured light patterns.
Preferably, the focal length of lens of first camera head is different from the focal length of lens of second camera head.
Preferably, the invisible laser is infrared ray laser.
Preferably, the laser projection device is arranged between first camera head and the second camera head.
Present invention also offers a kind of mobile terminal, including described combination shot system.
Present invention also offers a kind of image acquiring method, comprises the steps:
Projection step:Laser projection device is invisible to the total visual field projection of the first camera head and the second camera head The structured light patterns of laser;
First acquisition step:First camera head gathers the first otherwise visible light color image in the total visual field, Second camera head gathers the visible ray gray level image in the total visual field;
Second acquisition step:One of first camera head and the second camera head also gather the total visual field In black light image;
Process step:The processor utilizes first otherwise visible light color image and visible ray gray level image synthesis second Otherwise visible light color image, and depth image is calculated using the black light image.
Preferably, in the projection step:
The laser projection device alternately projects the structured light patterns to the total visual field and closes described in projection Structured light patterns;
In first acquisition step:
One of described black light image is gathered in first camera head and the second camera head, in the laser Projection arrangement gathers the first black light image during projecting the structured light patterns, closes in the laser projection device and projects The second black light image is gathered during the structured light patterns;
In the process step:
The processor utilizes the first black light image and the difference image of the second black light image to calculate institute State depth image.
Preferably, project in the cycle of the structured light patterns in the laser projection device alternating projection and closing, throw The duration of the structured light patterns is penetrated more than the duration for closing the projection structured light patterns.
The invention has the beneficial effects as follows:
Compared to prior art, the present invention can realize the high-quality colour to target with less volume, lower power consumption The collection of image and depth image.
【Description of the drawings】
Fig. 1 is the combination shot system schematic of an embodiment of the present invention
Fig. 2 is the structural representation of the camera head of an embodiment of the present invention
Fig. 3 is the optical filter schematic diagram of first camera head of an embodiment of the present invention
Fig. 4 is the optical filter schematic diagram of the second camera head of another kind embodiment of the invention
Fig. 5 is the projection sequential chart of the laser projection device of an embodiment of the present invention
Fig. 6 is the mobile terminal schematic diagram of an embodiment of the present invention
【Specific embodiment】
Preferred embodiment to inventing is described in further detail below.
As shown in figure 1, a kind of combination shot system of embodiment, including the first camera head, the second camera head, laser Projection arrangement and processor, processor are electrically connected with the first camera head, the second camera head and laser projection device respectively.
The laser projection device is used for, and the total visual field to first camera head and the second camera head projects not The structured light patterns of visible laser;First camera head is used for, and gathers the first otherwise visible light color in the total visual field Image, second camera head are used for, and gather the visible ray gray level image in the total visual field;First camera head It is additionally operable to gather the black light image in the total visual field with one of the second camera head;The processor is used for, Synthesize the second otherwise visible light color image using first otherwise visible light color image and visible ray gray level image, and using described Black light image calculates depth image.
In Fig. 1, FOV represents the visual angle of the first camera head and the second camera head, the projection scope of laser projection device Cover the total visual field of the first camera head and the second camera head.
As shown in Fig. 2 the typical structure schematic diagram of camera head, including imageing sensor 1, optical filter 2 and lens 3, light Through lens 3 convergence again after optical filter 3 by imageing sensor gather.Optical filter 2 is for by the light of specific wavelength, figure As sensor 1 is used for converting light to digital electric signal.
The Baeyer optical filter that common RGB camera is adopted, optical filter is with identical with image sensor pixel quantity and one One corresponding filter unit, Baeyer optical filter have for respectively by the filter unit of HONGGUANG, green glow and blue light, light process The pixel of imageing sensor corresponding with the filter unit is incided after certain filter unit.It is quicker to green glow in view of human eye Sense, therefore be R (25%) generally by the ratio setting of three:G (50%):B (25%).
As shown in figure 3, in a kind of embodiment, the first camera head is used for gathering the first otherwise visible light color image and can not See light image, the second camera head is only used for gathering visible ray gray level image.Such as the first camera head adopts RGB-IR cameras, The optical filter which adopts is different from Baeyer optical filter, and the optical filter of the present embodiment is made up of four kinds of different filter units, respectively R, G, B and infrared light (IR) component can be passed through, four ratio is R (25%):G (25%):B (25%):IR (25%), By using this optical filter 2, the first camera head can both gather otherwise visible light color image, it is also possible to gather sightless red Outer light image.It is of course also possible to use the filter unit of other black lights substitutes IR filter units, to coordinate laser projection to fill Put other invisible laser of projection.The arrangement mode of each filter unit of the optical filter of the present embodiment and each component accounting are not Uniquely, it is possibility to have other arrangements and distribution mode.
After imageing sensor in first camera head obtains the optical information of each component (such as R, G, B, IR), due to Each optical information all only occupies the pixel of part, so that recovering other three kinds points in each pixel by way of interpolation The intensity information of amount, so that finally realize synchronous acquisition RGB image and IR images.The method of interpolation has various, such as plus Weight average etc., due to for prior art thus do not described in detail here.
The second camera head in the present embodiment is gray scale camera, and its optical filter is transparent, or does not have optical filter. Due to not filtering the light of some wavelength, thus stronger optical signal can be collected, even if under gloomy environment Also preferable image effect has been can guarantee that.
As shown in figure 4, in another embodiment, the first camera head is used only for gathering the first otherwise visible light color figure Picture, the second camera head are used for gathering visible ray gray level image and black light image.Fig. 4 second is taken the photograph in a kind of embodiment As the optical filter that device is adopted, wherein IR represent infrared filtering unit, W represents white light filter element i.e. transparent cell, Ke Yitong Cross the light of any wavelength.
Laser projection device is different according to the structured light patterns of projection, and its structure is also different.The present embodiment is with speckle particle Illustrate as a example by structured light patterns.Laser projection device is typically by light source, collimating lens and diffraction optical element (DOE) group Into.In the present embodiment, light source is iraser, can be that single edge emitting LASER Light Source, or vertical-cavity surface-emitting swash Optical arrays light source.As the light that LASER Light Source sends has certain angle of divergence so that using collimating lens collimated with Launch the light beam of focal length.Laser beam is expanded into multiple laser Jing after DOE, and forms speckle particle pattern in space.
In much using scene, it is to gather image under the irradiation of the light sources such as sunlight, these light sources are usually contained There is black light identical black light (such as infrared light) projected with laser projection device, the light note of this part is to collection Black light image produce impact, particularly in the case of light source is more strong, the black light image for gathering can be caused The unfavorable situation such as contrast is relatively low, noise is big.In one embodiment, it is spaced to total visual field by controlling laser projection device Projection structure light pattern is eliminating this adverse effect.As shown in figure 5, being a kind of interval throwing of laser projection device of embodiment Shadow sequential chart, such as closes laser projection device projection in the T1 time periods, and gathers corresponding black light pattern I1, and in phase The adjacent T2 time periods open laser projection device projection, and gather corresponding black light pattern I2... by that analogy.When adjacent Between section spacing frequency be not more than black light image frequency acquisition, you can once can not with only gathering in a period of time See light image, it is also possible to gather multiple black light image.To illustrate how to below eliminate with frequency identical situation The impact of black light image of the black light that light source is produced to gathering.
In the T1 time periods, laser projection device is closed, and the black light image I1 of acquisition is only comprising invisible in light source Light composition.In the T2 time periods, the black light image I2 of acquisition black light then simultaneously comprising laser projection device projection into Point and light source black light composition.A kind of processing method is, it is assumed that the illumination of two neighboring time period inner light source does not become Change and collected object is not moved, now can be eliminated the effects of the act by infrared-difference:Differentiated black light figure As I2 '=I2-I1, such black light image I2 ' has more high-contrast.In another kind of processing method, it is possible to use in front and back At least two width black light images doing difference, such as:I2 '=I2- (I3+I1)/2.Concrete calculus of finite differences processing method also has many Kind.
It is as laser projection device is to close within a period of time, therefore under conditions of frequency acquisition is constant, overall The quantity of the black light image of acquisition is reduced, and causes certain impact to the follow-up depth image that calculates.In order to reduce this impact, The length of the length more than projection shut-in time section of projection opening time section, in the switch periods of laser projection device, is set (such as T2 is more than T1), obtain the collection frame number of higher black light image.
In one embodiment, a kind of image acquiring method, comprises the steps:
S1, laser projection device project invisible laser to the total visual field of the first camera head and the second camera head Structured light patterns.
S2, first camera head gather the first otherwise visible light color image in the total visual field, and described second takes the photograph As device gathers the visible ray gray level image in the total visual field.
One of S3, first camera head and second camera head also gather invisible in the total visual field Light image.
S4, the processor utilize first otherwise visible light color image and visible ray gray level image synthesis high-quality the Two otherwise visible light color images.
In the present embodiment, the first camera head is identical with the size and resolution of the image acquisition device of the second camera head, this Sample visible ray gray level image and the first otherwise visible light color image only need to consider two image acquisition devices due to position in synthesis The image registration problem that difference causes.The parameter of the first camera head and the second camera head can also in other embodiments Differ.Image registration algorithm is known technology more ripe at present, is not elaborated here.Due to visible ray gray-scale maps Seem not filter through optical filter and directly receive acquired in visible ray, thus its light sensitivitys is stronger, can with first by which See that light coloured image carries out synthesis and can realize following effect:
Details strengthens.Under half-light environment, many details in the first otherwise visible light color image relatively will be obscured, now It will be seen that after in light gray level image, the details of the part is synthesized with the first otherwise visible light color image, the second visible ray of formation Coloured image will possess the image effect for becoming apparent from.
Image zoom.First camera head and the focal length of lens of the second camera head are set to different, are such as respectively It is near burnt with remote Jiao.As the first otherwise visible light color image is obtained under remote focal length, thus the subject image in image nearby compares It is fuzzy, and visible ray gray level image is obtained under nearly focal length mode, now with the information in visible ray gray level image mending The part obscured in repaying the first otherwise visible light color image, ultimately forms the second relatively sharp otherwise visible light color image.
S5, the processor calculate depth image using the black light image.
May be constructed based on the trigon depth survey unit of structure light by the first camera head and laser projection device.Obtain The principle for taking depth information is the black light image that will collect to be carried out matching primitives with the reference picture that accesses in system and obtains Capture element deviation value, then just can be with using the one-to-one relationship of pixel deviation value and actual grade value by principle of triangulation Obtain the depth image of object space.Here reference picture is by gathering in the plane of depth camera known depth value Black light image and obtain.
As shown in fig. 6, a kind of mobile terminal 7 containing this combination shot system of embodiment, including processor, a shooting Device 4, laser projection device 5 and the second camera head 6.First camera head 4, laser projection device 5 and the second camera head 6 Can be arranged on the same surface of mobile terminal, laser projection device 5 is preferably provided at the first camera head 4 and second and takes the photograph As, between device 6, the first camera head 4, laser projection device 5 and the second camera head 6 are preferably provided on same straight line. Processor etc. can be made up of one or more in the CPU in mobile terminal, application specific processor, microelectronic component etc..It is mobile Terminal can be mobile phone, flat board, computer etc..
Above content is with reference to specific preferred implementation further description made for the present invention, it is impossible to assert The present invention be embodied as be confined to these explanations.For general technical staff of the technical field of the invention, On the premise of without departing from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the present invention by The scope of patent protection that the claims submitted to determine.

Claims (10)

1. a kind of combination shot system, is characterized in that, including the first camera head, the second camera head, laser projection device and Processor;
The laser projection device is used for, and the total visual field projection to first camera head and the second camera head is invisible The structured light patterns of laser;
First camera head is used for, and gathers the first otherwise visible light color image in the total visual field;
Second camera head is used for, and gathers the visible ray gray level image in the total visual field;
One of first camera head and the second camera head are additionally operable to gather the black light in the total visual field Image;
The processor is used for, and synthesizes the second visible brilliance using first otherwise visible light color image and visible ray gray level image Color image, and depth image is calculated using the black light image.
2. combination shot system as claimed in claim 1, is characterized in that,
The laser projection device is used for alternately projecting the structured light patterns and closing to the total visual field projecting described Structured light patterns;
Gathering one of described black light image in first camera head and the second camera head is used for, in the laser Projection arrangement gathers the first black light image during projecting the structured light patterns, closes in the laser projection device and projects The second black light image is gathered during the structured light patterns;
The processor is used for, and calculates institute using the difference image of the first black light image and the second black light image State depth image.
3. combination shot system as claimed in claim 1, is characterized in that,
Within the cycle of the laser projection device alternating projection and the closing projection structured light patterns, the structure light is projected The duration of pattern is more than the duration for closing the projection structured light patterns.
4. combination shot system as claimed in claim 1, is characterized in that,
The focal length of lens of first camera head is different from the focal length of lens of second camera head.
5. combination shot system as claimed in claim 1, is characterized in that,
The invisible laser is infrared ray laser.
6. combination shot system as claimed in claim 1, is characterized in that,
The laser projection device is arranged between first camera head and the second camera head.
7. a kind of mobile terminal, is characterized in that, including the combination shot system as described in claim 1-6 is arbitrary.
8. a kind of image acquiring method, is characterized in that, comprise the steps:
Projection step:Laser projection device projects invisible laser to the total visual field of the first camera head and the second camera head Structured light patterns;
First acquisition step:First camera head gathers the first otherwise visible light color image in the total visual field, described Second camera head gathers the visible ray gray level image in the total visual field;
Second acquisition step:One of first camera head and the second camera head are also gathered in the total visual field Black light image;
Process step:The processor utilizes first otherwise visible light color image and the synthesis second of visible ray gray level image visible Light coloured image, and depth image is calculated using the black light image.
9. image acquiring method as claimed in claim 8, is characterized in that,
In the projection step:
The laser projection device alternately projects the structured light patterns to the total visual field and closes the projection structure Light pattern;
In first acquisition step:
One of described black light image is gathered in first camera head and the second camera head, in the laser projection Device gathers the first black light image during projecting the structured light patterns, closes projection in the laser projection device described The second black light image is gathered during structured light patterns;
In the process step:
The processor utilizes the first black light image and the difference image of the second black light image to calculate the depth Degree image.
10. image acquiring method as claimed in claim 9, is characterized in that,
Within the cycle of the laser projection device alternating projection and the closing projection structured light patterns, the structure light is projected The duration of pattern is more than the duration for closing the projection structured light patterns.
CN201610958484.XA 2016-10-27 2016-10-27 Combined photographing system, mobile terminal and image processing method Pending CN106534633A (en)

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CN114284306A (en) * 2021-12-15 2022-04-05 武汉新芯集成电路制造有限公司 Depth and image sensor device, manufacturing method thereof and depth and image sensor chip

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