CN207589006U - A kind of wide-angle camera module and terminal - Google Patents
A kind of wide-angle camera module and terminal Download PDFInfo
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- CN207589006U CN207589006U CN201721855093.1U CN201721855093U CN207589006U CN 207589006 U CN207589006 U CN 207589006U CN 201721855093 U CN201721855093 U CN 201721855093U CN 207589006 U CN207589006 U CN 207589006U
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Abstract
The utility model discloses a kind of wide-angle camera module, including：Broad angle lens component, curved surface sensor, image signal processing blocks；The bending degree of the curved surface sensor is determined according to the parameter of the broad angle lens component, so as to make the equivalent optical path of light from the object side to the image side；The broad angle lens component includes the first negative lens being arranged in order by object space to image space, the second negative lens, the first positive lens, diaphragm, the second positive lens, third positive lens, optical filter；Described image processing module is used to handle curved surface sensor the image collected information.Wide-angle camera module provided by the utility model can realize the undistorted imaging of wide-angle camera.The invention also discloses a kind of terminals, have above-mentioned advantageous effect.
Description
Technical field
The utility model is related to camera technical field, more particularly to a kind of wide-angle camera module and terminal.
Background technology
With the progress of society, the application of wide-angle lens is more and more wider, such as medical electronic endoscope system, vehicle-mounted prison
Control system, bank, the special monitoring system in classroom and supermarket etc..But the imaging system using wide-angle lens is providing a wide range of imaging
While, also bring more serious pattern distortion so that photographic subjects are difficult to recognize or recognize inaccurate.At present on the market
Basic listing needs more complicated algorithm using the method for image procossing, and algorithm can influence distortion correction influence.
In summary as can be seen that the undistorted imaging of wide-angle camera how to be made to be to have the problem of to be solved at present.
Utility model content
The purpose of this utility model is to provide a kind of wide-angle camera module, and it is abnormal to have solved wide-angle camera in the prior art
Become the problem of serious；The utility model additionally provides a kind of this terminal, has above-mentioned advantageous effect.
In order to solve the above technical problems, the utility model provides a kind of wide-angle camera module, including：Broad angle lens group
Part, curved surface sensor, image signal processing blocks；The bending degree of the curved surface sensor is according to the broad angle lens component
Parameter determines, so as to make the equivalent optical path of light from the object side to the image side；The broad angle lens component include by object space to image space according to
First negative lens of secondary arrangement, the second negative lens, the first positive lens, diaphragm, the second positive lens, third positive lens, optical filter；Institute
Image processing module is stated for handling curved surface sensor the image collected information.
Preferably, the curved surface sensor is curved surface RGB cmos sensors.
Preferably, the curved surface sensor includes：Pel array, analogy signal processing unit, A/D converting units, silicon substrate
Piece；Wherein, the pel array, the analogy signal processing unit, the A/D converting units are integrated on the silicon chip；
The pel array converts optical signals to electric signal after incident ray irradiation is received；The analogy signal processing unit is used
In the sampling and amplification of realizing pixel unit output signal in pel array；The A/D converting units are used to that the mould will to be passed through
Intend the electric signal after signal processing unit processes and be converted to digital signal, so as to fulfill the Digital output of image information.
Preferably, the analogy signal processing unit includes correlated double sampling circuit and operational amplification circuit.
Preferably, the pel array is photo-diode cast active pixel array.
Preferably, the curved surface sensor further includes imaging sensor processor, for passing through the A/D converting units
Obtained digital signal carries out auto-exposure control, removal noise, automatic white balance, color correction, the processing of bad point correct operation.
Preferably, first negative lens, the second negative lens, the first positive lens, the second positive lens and third positive lens are equal
For glass lens.
Preferably, the surface of the optical filter is coated with infrared cutoff filter membrane, for modifying incident ray and filtering incident light
The infrared ray of line.
The utility model additionally provides a kind of terminal, including wide-angle camera module described above.
Wide-angle camera module provided by the utility model, including：Broad angle lens component, curved surface sensor, image letter
Number processing module；The bending degree of the curved surface sensor is determined according to the parameter of the broad angle lens component, so as to make light
Equivalent optical path from the object side to the image side；The broad angle lens component includes the first negative lens being arranged in order by object space to image space,
Second negative lens, the first positive lens, diaphragm, the second positive lens, optical filter, third positive lens；Described image processing module is used for
Curved surface sensor the image collected information is handled.Wide-angle lens module provided by the utility model is according to wide
The parameter of angle Lens assembly determines the bending degree of sensor；According to the condition of perfect imaging, i.e.,：If light from object space to
The equivalent optical path of image space, then will be into perfect picture, i.e. image distortion very little in image space, and there is no losses for resolution factor.Therefore originally
Utility model utilizes the structure of curved surface sensor combination wide-angle lens, eliminates wide-angle camera module spherical aberration and the characteristic of distortion,
So as to fulfill the undistorted imaging of wide-angle camera.
Description of the drawings
For the clearer technical solution for illustrating the utility model embodiment or the prior art, below will to embodiment or
Attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
Some embodiments of the utility model, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of structure chart of the specific embodiment of wide-angle camera module provided by the utility model；
Fig. 2 is index path of the light beam through spherical imaging.
Specific embodiment
The core of the utility model is to provide a kind of wide-angle camera module, can realize wide-angle camera it is undistorted into
Picture.The utility model additionally provides a kind of terminal, has above-mentioned advantageous effect.
In order to which those skilled in the art is made to more fully understand the utility model, below in conjunction with the accompanying drawings and it is embodied
The utility model is described in further detail for mode.Obviously, described embodiment is only the utility model part
Embodiment, instead of all the embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not doing
Go out all other embodiments obtained under the premise of creative work, shall fall within the protection scope of the present invention.
Wide-angle lens is that a kind of focal length is shorter than standard lens, visual angle is more than standard lens, focal length is longer than fish eye lens, visual angle
Less than fish-eye photographic mirror.
It please refers to Fig.1, Fig. 1 is a kind of structure chart of wide-angle camera module provided by the utility model；The present embodiment
The wide-angle camera module provided includes：Broad angle lens component, the broad angle lens component are included by object space to image space successively
First negative lens 1 of arrangement, the second negative lens 2, the first positive lens 3, diaphragm 4, the second positive lens 5, third positive lens 6 filter
Piece 7；The wide-angle camera module further includes curved surface sensor 8, image signal processing blocks.The bending of the curved surface sensor
Degree is determined according to the parameter of the broad angle lens component, so as to make the equivalent optical path of light from the object side to the image side；Described image
Processing module is used to handle curved surface sensor the image collected information.
The lens of the broad angle lens component can be glass lens, or resin lens；Due to resin lens
The optical indexes such as light transmittance and photonasty are poor, in the present embodiment, first negative lens 1, second negative lens 2, institute
The first positive lens 3 is stated, second positive lens 5, the third positive lens 6 is glass lens.
The surface of the optical filter 7 is coated with infrared cutoff filter membrane, for modifying incident ray and filtering the red of incident ray
Outside line.
Perfect imaging refer to object and have the variation of size as between and formless variation, i.e. object with as it is complete it is similar
Imaging light path refer to the distance and the product of the medium refraction index that light propagates in the medium.
As illustrated in fig. 2, it is assumed that light pencil is through spherical imaging, A1AA2And A2'A'A1' it is spherical surface with 0 for the centre of sphere, according to etc.
Equation of light formula：A1A1'nGlass=AA'nGlass=A2A2'nGlass；Therefore A2'A'A1' it is known as A1AA2Perfect picture.
But for the object B of the wide light velocity1AB2, there is the object of one fixed width, light path： B1A1nIt is empty+A1A1'nGlass≠A1A1'
nGlass, B2A1nIt is empty+A2A2'nGlass≠A1A1'nGlass, module is not into perfect picture, therefore there are curvature of the images for camera module.It is curved according to image planes
Bent aplanatism formula, we tentatively recognize that the imaging surface of practical picture can be shaped like B2'A'B1', i.e., surrounding protrudes, intermediate recess.If
Imaging sensor is made to the structure of bending spherical surface, it is possible to solve wide-angle camera distortion seriously and quadrangle resolution factor is poor asks
Topic.Therefore the sensor of wide-angle camera is set as curved surface sensor by the present embodiment, using curved surface sensor, is eliminated wide-angle and is taken the photograph
As head mould group spherical aberration and the characteristic of distortion, so as to fulfill the undistorted imaging of wide-angle camera.
It should be noted that the curved surface sensor of wide-angle camera module is that can be curved surface RGB cmos sensors,
Can be curved surface RGB ccd sensors；In the present embodiment, curved surface RGB cmos sensors are selected.
The curved surface RGB cmos sensors include pel array, analogy signal processing unit, A/D converting units, silicon substrate
Piece；The pel array, the analogy signal processing unit, the A/D converting units are integrated on the silicon chip；The picture
Pixel array converts optical signals to electric signal after incident ray irradiation is received；The analogy signal processing unit is used to implement
The sampling and amplification of pixel unit output signal in pel array；The A/D converting units are used to that the analog signal will to be passed through
Electric signal after processing unit processes is converted to digital signal, so as to fulfill the Digital output of image information.
Difference of the pel array of the curved surface RGB cmos image sensors according to cellular construction, can be by pixel unit
It is divided into passive pixel cell PPS (passive pixel schematic), active pixel cell APS (activepixel
) and logarithmic pixel unit schematic；Active pixel cell APS can be divided into photodiode type APS, grating type APS again.
Photo-diode cast active pixel array is selected in the present embodiment.Pel array can be by the photodiode of M rows × N row
(PD APS) array forms, i.e., M × N includes pixel unit in the pel array of imaging sensor, and each pixel unit
Include a photodiode.Photodiode uses the PN junction photodiode of N traps/substrate P type.
The analogy signal processing unit is mainly used to realize the sampling and holding of pixel unit output signal, and it is accurate to obtain
Reflect the analog voltage of light intensity magnitude and reduce the energy supply of fixed pattern noise.The analogy signal processing unit includes related double
Sample circuit (Correlated Double Sampling CDS) and operational amplification circuit.In the present embodiment using row grade
Simulation process signal element structure, i.e., an each row pixel corresponding sampling and holding circuit and operation jointly in pel array
Amplifying circuit.For row grade analog signal processing circuit module, selected entire row of pixels information can be collected CDS simultaneously
It is handled in circuit.Due to the method that analogy signal processing unit described in the present embodiment uses correlated-double-sampling, so for one
The cmos image sensor array of a N row, alignment need to connect by 2 × M sampling holding capacitor and M for reducing letter
The circuit module that the amplifier of number noise is formed.1/f noise, KTC noise and fixed pattern noise (FPN) are cmos image sensings
Most important noise source in device reading circuit in order to improve the signal-to-noise ratio of output signal and dynamic range, needs to realize using CDS
Noise suppressed.
The A/D converting units are the voltage directly proportional to light intensity in pixel for analogy signal processing unit to be exported
Signal is converted to digital signal, so as to fulfill the Digital output of picture signal.In the curved surface RGB that the present embodiment is provided
Cmos image sensor may be used：Each pixel unit in Pixel-level ADC, i.e. pel array includes an ADC；Row grade
ADC, i.e., each row pixel share an ADC for being located at array bottom；Chip-scale ADC, i.e., the pel array of entire sensor is only
Use an adc circuit.
Described image sensor processor, it is automatic for being carried out to the digital signal obtained by the A/D converting units
The place of the functions such as spectrum assignment (AEC), removal noise, automatic white balance (AWB), color correction (CCM), bad point correction (DPC)
Reason
Under different scenes, the intensity of illumination has very big difference.Human eye has adaptive ability therefore can be quickly
Adjustment, allow oneself to sense suitable brightness.And imaging sensor does not have this adaptive ability, it is therefore necessary to
Ensure that the photo of shooting obtains accurately exposure so as to suitable brightness using automatic exposure function.The realization of dynamic exposure
Generally comprise three steps：Luminous intensity measurement, scene analysis and exposure compensating.The process of luminous intensity measurement is believed using the exposure of image
Cease the process to obtain current light information.According to the difference of statistical, it is divided into global statistics, central weight is counted or added
Weight average statistical etc..Global statistics mode refers to all count into image whole pixel, and central weight statistics refers to only
Statistical picture middle section, this main part for being primarily due to normal conditions hypograph are all located at the middle section of image；Add
The statistical of weight average refers to for image to be divided into different parts, and each section assigns different weights, such as middle section
Weight limit is assigned, corresponding marginal portion then assigns smaller weight, and the result that statistics obtains in this way can be more accurate.Scene
Analysis refers to the processing carried out to obtain the special circumstances of current light, such as either with or without the strong light of backlight illumination or front
Etc. under scenes.Analysis to these information can promote the ease for use of imaging sensor, and can increase substantially the matter of image
Amount, this is technology the most key in automatic exposure.The technology of currently used scene analysis mainly has fuzzy logic and artificial
Neural network algorithm.These algorithms survey light algorithm compared with fixed partition has higher reliability, is primarily due in fuzzy rule
Then various different illumination conditions are already had accounted in the training process of formulation or neural network.Completing luminous intensity measurement and field
It comes into force after scape analysis it is necessary to control corresponding parameter so that exposing and adjusting.Mainly increased by setting time for exposure and exposure
Benefit is realized.It is obtained by the illumination and yield value of the present image obtained during luminous intensity measurement and the comparison of target brightness value
The time for exposure that should be set and amount of gain adjustment.In practical situations, camera usually can also use aperture/shutter system of camera lens
It unites to increase photosensitive range.
Image is obtained using CMOS sensor, light levels and Sensor Problem are the masters for generating much noise in image
Want factor.Meanwhile when signal passes through ADC, and some other noise can be introduced.These noises can make image integrally become mould
Paste, and many details are lost, so the method traditional to image progress denoising space denoising is needed to have mean filter, height
This filtering etc..But general gaussian filtering mainly considers the space length relationship between pixel when being sampled, not
Consider the similarity degree between pixel value, therefore the fuzzy result obtained in this way is typically that whole pictures one are fuzzy.So one
As using non-linear Denoising Algorithm, such as two-sided filter not only considers relationship of the pixel on space length, together in sampling
When add similarity degree between pixel and consider, thus the substantially piecemeal of original image can be kept, and then keep edge.
Human visual system has the characteristics that color constancy, therefore the mankind can not be by light source face to the observation of things
The influence of color.But imaging sensor in itself and without this color constancy the characteristics of, therefore, clapped under different light
The image taken the photograph can be influenced by light source colour and be changed.Such as the image taken under bright day may
It is partially blue, and the object color taken under candle light can be partially red.Therefore, imaging sensor is imaged in order to eliminate light source colour
Influence, automatic white balance (AWB Automatic White Balance) function is exactly to simulate the face of human visual system
Color shape constancy feature eliminates influence of the light source colour to image.
Color correction (CCM Color Correction Matrix) mainly for correct at filter each color block it
Between the color error that brings of color penetration.The process of general color correction is the figure taken first with the imaging sensor
As compared with standard picture, a correction matrix is calculated with this.The matrix is exactly the color school of the imaging sensor
Positive matrices.During the image sensor application and the matrix can be utilized to all captured by the imaging sensor
Image is corrected, to obtain the image closest to object true colors.Under normal circumstances, the corrected mistake to color
Journey can all be accompanied by the adjustment to color saturation.The saturation degree of color refers to the purity of color, and the purity of certain color is higher,
Then its performance is distincter；Purity is lower, performance it is then dulller.The trichromatic saturation degrees of RGB are higher, then displayable
Color Range is more extensive.
The array processes existing defects or optical signal that the point of each light acquisition is formed on sensor in imaging sensor
Occur mistake during being converted, can cause on image that the information of some pixels is wrong, lead to pixel value in image not
Accurately, these defective pixels are dead pixel points of images (Bad pixel).Due to coming from different process technology and sensor manufacture
Quotient, the dead pixel points of images number of different sensors are different.In addition, if sensor is for a long time, under hot environment, bad point can also be got over
Come it is more, so as to destroy the clarity of image and integrality.(DPC Defect Pixel are corrected by ISP bad points
Correction it is) method that solves the problems, such as this, bad point includes：Static bad point and dynamic bad point；Static bad point includes bright spot
And dim spot；In general the brightness value of pixel is proportional to incident light, and the brightness value of bright spot is significantly greater than incident light and multiplies
With corresponding proportion, and with the increase of time for exposure, the brightness of the point can dramatically increase；Dim spot is no matter under what incident light
Value is always close to 0；In certain pixel coverage, dynamic bad point is acted normally, and more than this range, the ratio week of dynamic bad point
It is bright to enclose pixel.
The utility model utilize curved surface sensor combination wide-angle lens structure, solve wide-angle camera distortion seriously,
The defects of photographic subjects identification is unclear；Wide-angle camera module spherical aberration and the characteristic of distortion are eliminated, so as to fulfill wide-angle camera
Undistorted imaging.
Based on above-described embodiment, terminal provided by the utility model can include the wide-angle that above-described embodiment is provided and take the photograph
As head mould group.The terminal utilize wide-angle camera combination curved surface sensor structure, eliminate wide-angle camera module spherical aberration with
The characteristic of distortion.
The other devices and workflow of the imaging sensor for the camera module that the present embodiment is provided can refer to
The introduction of above-described embodiment, details are not described herein.
A kind of wide-angle camera module provided by the utility model and terminal are described in detail above.Herein
In apply specific case the principle and embodiment of the utility model be expounded, the explanation of above example is only used
Understand the method and its core concept of the utility model in help.It should be pointed out that for those skilled in the art
For, under the premise of the utility model principle is not departed from, can also to the utility model, some improvement and modification can also be carried out, these
Improvement and modification are also fallen into the protection domain of the utility model claims.
Claims (9)
1. a kind of wide-angle camera module, which is characterized in that including：Broad angle lens component, curved surface sensor, picture signal processing
Module；
The bending degree of the curved surface sensor determines according to the parameter of the broad angle lens component, so as to make light from object space to
The equivalent optical path of image space；
The broad angle lens component includes the first negative lens being arranged in order by object space to image space, and the second negative lens, first just thoroughly
Mirror, diaphragm, the second positive lens, third positive lens, optical filter；
Described image processing module is used to handle curved surface sensor the image collected information.
2. wide-angle camera module as described in claim 1, which is characterized in that the curved surface sensor is curved surface RGB CMOS
Sensor.
3. wide-angle camera module as claimed in claim 2, which is characterized in that the curved surface sensor includes：Pel array,
Analogy signal processing unit, A/D converting units, silicon chip；
Wherein, the pel array, the analogy signal processing unit, the A/D converting units are integrated on the silicon chip；
The pel array converts optical signals to electric signal after incident ray irradiation is received；
The analogy signal processing unit is used to implement the sampling and amplification of pixel unit output signal in pel array；
The A/D converting units are for will treated that electric signal is converted to digital letter by the analogy signal processing unit
Number, so as to fulfill the Digital output of image information.
4. wide-angle camera module as claimed in claim 3, which is characterized in that the analogy signal processing unit includes correlation
Dual-sampling circuit and operational amplification circuit.
5. wide-angle camera module as claimed in claim 3, which is characterized in that the pel array has for photo-diode cast
Active pixel array.
6. wide-angle camera module as claimed in claim 3, which is characterized in that the curved surface sensor further includes image sensing
Device processor, for the digital signal obtained by the A/D converting units is carried out auto-exposure control, removal noise, from
Dynamic white balance, color correction, the processing of bad point correct operation.
7. wide-angle camera module as described in claim 1, which is characterized in that first negative lens, the second negative lens,
One positive lens, the second positive lens and third positive lens are glass lens.
8. wide-angle camera module as claimed in claim 7, which is characterized in that the surface of the optical filter is coated with infrared cutoff
Filter membrane, for modifying incident ray and filtering the infrared ray of incident ray.
9. a kind of terminal, which is characterized in that including such as claim 1 to 8 any one of them wide-angle camera module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721855093.1U CN207589006U (en) | 2017-12-25 | 2017-12-25 | A kind of wide-angle camera module and terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721855093.1U CN207589006U (en) | 2017-12-25 | 2017-12-25 | A kind of wide-angle camera module and terminal |
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| CN207589006U true CN207589006U (en) | 2018-07-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111427173A (en) * | 2020-04-02 | 2020-07-17 | 深圳益实科技有限公司 | L CD display screen online monitoring system and method based on super wide-angle image sampling |
| CN114125238A (en) * | 2021-11-30 | 2022-03-01 | 维沃移动通信有限公司 | Image sensor, camera module and electronic equipment |
-
2017
- 2017-12-25 CN CN201721855093.1U patent/CN207589006U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111427173A (en) * | 2020-04-02 | 2020-07-17 | 深圳益实科技有限公司 | L CD display screen online monitoring system and method based on super wide-angle image sampling |
| CN111427173B (en) * | 2020-04-02 | 2023-06-13 | 深圳益实科技有限公司 | LCD display screen on-line monitoring system and method based on ultra-wide angle image sampling |
| CN114125238A (en) * | 2021-11-30 | 2022-03-01 | 维沃移动通信有限公司 | Image sensor, camera module and electronic equipment |
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