CN106982328A - Double-core focus image sensor and its focusing control method and imaging device - Google Patents
Double-core focus image sensor and its focusing control method and imaging device Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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Abstract
The invention discloses a kind of double-core focus image sensor and its focusing control method and imaging device, wherein, double-core focus image sensor includes：Photosensitive unit array, it is arranged on the filter unit array on the photosensitive unit array, and the microlens array on the filter unit array, wherein, the microlens array includes the first lenticule and the second lenticule, one first lenticule covers a white filter unit, one white filter unit covers a focusing photosensitive unit, the focusing photosensitive unit includes N*N photosensitive pixel, one photodiode of each photosensitive pixel correspondence, the photodiode is sector, one the second lenticule covers a double-core focusing photosensitive pixel.The double-core focus image sensor of the embodiment of the present invention, by increasing capacitance it is possible to increase the thang-kng amount of focusing pixel, hardware foundation is provided to lift the focusing speed under low luminous environment.
Description
Technical field
The present invention relates to vision facilities technical field, more particularly to a kind of double-core focus image sensor and its focusing control
Method and imaging device.
Background technology
In related focusing technology, double-core both full-pixel focusing technology turns into state-of-the-art focusing technology in the market.
Be compared to contrast focusing, laser focusing and phase focusing technology, double-core both full-pixel focus technology focusing speed faster, it is and right
Burnt scope is wider.Further, since in double-core both full-pixel focusing technology, " double-core " photodiode " merging " in imaging is one
Pixel is exported, and can not influence image quality while focusing performance is ensured.
However, because when use double-core both full-pixel focusing technology is focused, the photodiode of each pixel is by one point
For two, reduce thang-kng amount, and then cause double-core focusing under low luminous environment difficult.
The content of the invention
The purpose of the present invention is intended at least solve one of above-mentioned technical problem to a certain extent.
Therefore, first purpose of the present invention is to propose a kind of focusing control method of double-core focus image sensor,
This method can increase the thang-kng amount of focusing pixel, effectively lift the focusing speed under low luminous environment.
Second object of the present invention is to propose a kind of double-core focus image sensor.
Third object of the present invention is to propose a kind of imaging device.
Fourth object of the present invention is to propose a kind of mobile terminal.
To achieve these goals, first aspect present invention embodiment proposes a kind of focusing of double-core focus image sensor
Control method, wherein, the double-core focus image sensor includes：Photosensitive unit array, it is arranged on the photosensitive unit array
On filter unit array and the microlens array on the filter unit array, wherein, the microlens array bag
The first lenticule and the second lenticule are included, first lenticule covers a white filter unit, the white
Filter unit covers a focusing photosensitive unit, and the focusing photosensitive unit includes N*N photosensitive pixel, each photosensitive pixel pair
A photodiode is answered, the photodiode is sector, and second lenticule covers a double-core focusing photosensitive pixel,
It the described method comprises the following steps：
The photosensitive unit array is controlled to enter focal modes；
Read the poor information of first phase of the focusing photosensitive unit and the second phase of double-core focusing photosensitive pixel
Poor information；
Focusing control is carried out according to the poor information of the first phase and the poor information of the second phase.
The focusing control method of the double-core focus image sensor of the embodiment of the present invention, based on the first lenticule covering
One white filter unit, a white filter unit covers each photosensitive in a focusing photosensitive unit, focusing photosensitive unit
The fan-shaped photodiode of pixel correspondence one, second lenticule covers a double-core focusing photosensitive pixel, passes through reading pair
The poor information of second phase of the poor information of the first phase of burnt photosensitive unit and double-core focusing photosensitive pixel, and it is poor according to first phase
Information and the poor information of second phase carry out focusing control, by increasing capacitance it is possible to increase the thang-kng amount of focusing pixel, are effectively lifted under low luminous environment
Focusing speed.
To achieve these goals, second aspect of the present invention embodiment proposes a kind of double-core focus image sensor, bag
Include：Photosensitive unit array, is arranged on the filter unit array on the photosensitive unit array, and positioned at filter unit battle array
Microlens array on row, wherein, the microlens array includes the first lenticule and the second lenticule, one described first
Lenticule covers a white filter unit, and a white filter unit covers a focusing photosensitive unit, the focusing
Photosensitive unit includes N*N photosensitive pixel, and each photosensitive pixel corresponds to a photodiode, and the photodiode is fan
Shape, second lenticule covers a double-core focusing photosensitive pixel.
The double-core focus image sensor of the embodiment of the present invention, includes the first lenticule and the second lenticule by setting
Microlens array, first lenticule covers a white filter unit, and a white filter unit covers a focusing sense
Each fan-shaped photodiode of photosensitive pixel correspondence one, the second lenticule covering one in light unit, focusing photosensitive unit
Individual double-core focusing photosensitive pixel, by increasing capacitance it is possible to increase the thang-kng amount of focusing pixel, is provided firmly to lift the focusing speed under low luminous environment
Part basis.
To achieve these goals, third aspect present invention embodiment proposes a kind of imaging device, the imaging device bag
Include：The double-core focus image sensor that above-mentioned second aspect embodiment is proposed；And control module, the control module controls described
Photosensitive unit array enters focal modes；Read the poor information of first phase and the double-core focusing sense of the focusing photosensitive unit
The poor information of the second phase of light pixel；Focusing control is carried out according to the poor information of the first phase and the poor information of the second phase
System.
The imaging device of the embodiment of the present invention, covers a white filter unit, one white based on first lenticule
Color filter unit covers each fan-shaped pole of photoelectricity two of photosensitive pixel correspondence one in a focusing photosensitive unit, focusing photosensitive unit
Pipe, second lenticule covers a double-core focusing photosensitive pixel, is believed by the first phase difference for reading photosensitive unit of focusing
The poor information of second phase of breath and double-core focusing photosensitive pixel, and carried out according to the poor information of first phase and the poor information of second phase
Focusing control, by increasing capacitance it is possible to increase the thang-kng amount of focusing pixel, effectively lifts the focusing speed under low luminous environment.
To achieve these goals, fourth aspect present invention embodiment also proposed a kind of mobile terminal, the mobile terminal
Including housing, processor, memory, circuit board and power circuit, wherein, the circuit board is placed in the sky that the housing is surrounded
Between it is internal, the processor and the memory are arranged on the circuit board；The power circuit, for for it is described it is mobile eventually
Each circuit or device at end are powered；The memory is used to store executable program code；The processor is by reading
State the executable program code that stores in memory to run program corresponding with the executable program code, for performing
The focusing control method for the double-core focus image sensor that above-mentioned first aspect embodiment is proposed.
The mobile terminal of the embodiment of the present invention, covers a white filter unit, one white based on first lenticule
Color filter unit covers each fan-shaped pole of photoelectricity two of photosensitive pixel correspondence one in a focusing photosensitive unit, focusing photosensitive unit
Pipe, second lenticule covers a double-core focusing photosensitive pixel, is believed by the first phase difference for reading photosensitive unit of focusing
The poor information of second phase of breath and double-core focusing photosensitive pixel, and carried out according to the poor information of first phase and the poor information of second phase
Focusing control, by increasing capacitance it is possible to increase the thang-kng amount of focusing pixel, effectively lifts the focusing speed under low luminous environment.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and be readily appreciated that, wherein：
Fig. 1 (a) is traditional double-core focus image sensor construction schematic diagram；
Fig. 1 (b) is photodiode opening schematic diagram in traditional double-core focus image sensor；
Fig. 2 is the profile of double-core focus image sensor according to an embodiment of the invention；
Fig. 3 is the top view of double-core focus image sensor according to an embodiment of the invention；
Fig. 4 is photodiode opening signal in double-core focus image sensor according to an embodiment of the invention
Figure；
Fig. 5 is the first lenticule arrangement density profile；
Fig. 6 is the flow chart of the focusing control method of double-core focus image sensor according to an embodiment of the invention；
Fig. 7 is the division effect diagram of 2*2 photosensitive pixel in focusing photosensitive unit according to an embodiment of the invention；
Fig. 8 is the flow chart of the focusing control method of double-core focus image sensor according to another embodiment of the present invention；
Fig. 9 is the schematic diagram that focusing photosensitive unit pixel value is obtained using interpolation algorithm；
Figure 10 is the structural representation of imaging device according to an embodiment of the invention；
Figure 11 is the structural representation of mobile terminal according to an embodiment of the invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
Below with reference to the accompanying drawings describe the embodiment of the present invention double-core focus image sensor and its focusing control method and into
As device.
Double-core both full-pixel focusing technology is state-of-the-art focusing technology, the double-core that the focusing technology is used in the market
Focus shown in sensor construction such as Fig. 1 (a), two photoelectricity two of correspondence under each lenticule (circle represents lenticule in Fig. 1 (a))
Pole pipe.When carrying out imaging, the value of " 1 " with " 2 " is added acquisition single component pixels value.When carrying out focusing process, read respectively
Go out the value of " 1 " and " 2 ", the drive volume and driving direction of camera lens can be calculated by the phase difference calculated between the two.
, it is understood that with the increase of sum of all pixels, " 1 " and " 2 " corresponding photosensitive area diminishes, and subtracts throughput
It is few, cause the phase information under low luminous environment easily to be flooded by noise, focusing is difficult.
In addition, in correlation technique, the photodiode used in double-core focus image sensor be usually it is square, such as
Shown in Fig. 1 (b), the photosensitive area of photodiode can not be made full use of when carrying out thang-kng using square photodiode, is made
Logical deficiency in light quantity under low luminous environment, and then influence the focusing speed under low luminous environment.
Therefore, in order to solve existing double-core both full-pixel focusing technology focused under low luminous environment difficulty the problem of, the present invention
Propose a kind of focusing control method of double-core focus image sensor, by increasing capacitance it is possible to increase the thang-kng amount of focusing pixel, effectively lifting
Focusing speed under low luminous environment.
Double-core pair needed for focusing control method first to realizing double-core focus image sensor proposed by the present invention below
Burnt imaging sensor is introduced.
Fig. 2 is the profile of double-core focus image sensor according to an embodiment of the invention, and Fig. 3 is according to this hair
The top view of the double-core focus image sensor of bright one embodiment.
As shown in Figures 2 and 3, the double-core focus image sensor 100 includes photosensitive unit array 10, filter unit array
20 and microlens array 30.
Wherein, filter unit array 20 is arranged on photosensitive unit array 10, and microlens array 30 is located at filter unit battle array
On row 20.Microlens array 30 includes the first lenticule 31 and the second lenticule 32.One the first lenticule 31 covers one
White filter unit 21, a white filter unit 21 covers a focusing photosensitive unit 11, and second lenticule 32 is covered
One filter unit 22 a, filter unit 22 covers a double-core focusing photosensitive pixel 12.
In an embodiment of the present invention, double-core focusing photosensitive pixel 12 is arranged as Bayer array (Bayer pattern).
Picture signal can be handled to the algorithm of Bayer structure using conventional needle using Bayer structure, without being done on hardware configuration
Big adjustment.Double-core focusing photosensitive pixel 12 has two photodiodes, respectively the first photodiode 121 and the second light
Electric diode 122, corresponds respectively to " 1 " and " 2 " of each double-core focusing photosensitive pixel 12 in Fig. 3.
In an embodiment of the present invention, focusing photosensitive unit 11 includes N*N photosensitive pixel 110 (in pair as shown in Figure 3
In the burnt image sensor architecture of verification, focusing photosensitive unit 11 includes 2*2 photosensitive pixel 110), a white filter unit 21
One focusing photosensitive unit 11 of covering, i.e., the N*N white filter unit 21 of the correspondence of photosensitive pixel 110 one.
Put it briefly, in the double-core focus image sensor 100 of the embodiment of the present invention, the N*N composition of photosensitive pixel 110 one
Group simultaneously shares first lenticule 31, and the group is the one white filter of the correspondence of photosensitive pixel 110 focused in photosensitive unit 11
Light unit 21.
In an embodiment of the present invention, one photodiode of each photosensitive pixel correspondence in focusing photosensitive unit 11, and
Photodiode is sector, as shown in the grey sector portion in Fig. 3 and Fig. 4 in white portion.Shown in Fig. 1 (b)
Square photodiode photosensitive area, the photosensitive area of the fan-shaped photodiode shown in Fig. 4 is bigger, therefore the present invention
Fan-shaped photodiode disclosed in embodiment used in double-core focus image sensor can obtain bigger thang-kng amount, more sharp
Focusing process under low luminous environment.
In one embodiment of the invention, microlens array 30 includes horizontal center line and vertical center line, and first is micro-
Lens 31 are multiple.Multiple first lenticules 31 include being arranged on first group of first lenticule 31 of horizontal center line and are arranged on
Second group of first lenticule 31 of vertical center line.
In one embodiment of the invention, microlens array 30 can also include four sidelines, and now, multiple first is micro-
Lens 31 also include the 3rd group of first lenticule 31 for being arranged on four sidelines.
When microlens array 30 includes horizontal center line, vertical center line and four sidelines, first group of first lenticule
31 and the lens density of second group of first lenticule 31 be more than the lens density of the 3rd group of first lenticule 31.
In order to make it easy to understand, illustrating the arrangement mode of the first lenticule 31 in microlens array 30 below in conjunction with the accompanying drawings.Fig. 5
It is the first lenticule arrangement density profile.As shown in figure 5, the white filter unit 21 covered by the first lenticule 31, that is, scheme
Middle W, scattered distribution, accounts for the 3%~5% of total number of pixels in whole double-core focus image sensor, in microlens array 30
Horizontal center line and vertical center line on W distribution it is more dense, on four sidelines W distribution it is more sparse, pay the utmost attention to picture
The focusing accuracy and speed of intermediate region, in the case where not influenceing image quality, effectively lift focusing speed.
It should be noted that the W in Fig. 3 and Fig. 5 represents the first lenticule 31 covering in double-core focus image sensor
Filter unit is white filter unit 21, and bigger thang-kng amount is resulted in during using white filter unit 21.First lenticule
The filter unit of 31 coverings can also be that the W in green filter unit, i.e. Fig. 3 and Fig. 5 could alternatively be G, using green filter
During unit, available information during imaging is more.It should be appreciated that in the embodiment of the present invention only using white filter unit as
Example is illustrated, and cannot function as limitation of the present invention.
Based on the structure of double-core focus image sensor in Fig. 2-Fig. 5, the double-core focusing to the embodiment of the present invention below is schemed
As the focusing control method of sensor is illustrated.Fig. 6 is double-core focus image sensor according to an embodiment of the invention
The flow chart for control method of focusing, as shown in fig. 6, this method comprises the following steps：
S61, control photosensitive unit array enters focal modes.
When being taken pictures using camera, if feeling, the image definition of display is not enough, at this point it is possible to control photosensitive unit
Array enters focal modes, to improve the definition of photo by focusing.
S62, reads the poor information of first phase of focusing photosensitive unit and the second phase difference letter of double-core focusing photosensitive pixel
Breath.
In an embodiment of the present invention, after focal modes are entered, the of focusing photosensitive unit can further be read
The poor information of second phase of one phase information and double-core focusing photosensitive pixel.
Alternatively, in one embodiment of the invention, the poor information of first phase of focusing photosensitive unit is read, can be wrapped
Include：Read focusing photosensitive unit in a part of photosensitive pixel output valve and be used as the first output valve；Read focusing photosensitive unit
The output valve of middle another part photosensitive pixel is simultaneously used as the second output valve；First is obtained according to the first output valve and the second output valve
Phase information.
Below so that photosensitive unit of focusing is including 2*2 photosensitive pixel as an example, focusing photosensitive unit is entered from different angles
Row is divided, as shown in fig. 7,3 width figures shown in Fig. 7 are from left and right sides, upper and lower sides and diagonal respectively to focusing photosensitive unit
The division that side is carried out, is described as follows：
Example one, is divided to focusing photosensitive unit from left and right sides.
In this example, 2*2 photosensitive pixel in focusing photosensitive unit is divided into two parts of left and right sides, photosensitive unit of focusing
In a part of photosensitive pixel can be left in two photosensitive pixels on the left of 2*2 photosensitive pixel, the photosensitive unit that will focus
Focused as the first output valve, the then output valve of two " 2 " on right side in photosensitive unit of the output valve of two " 1 " of side is used as the
Two output valves.
Example two, is divided to focusing photosensitive unit from upper and lower sides.
In this example, 2*2 photosensitive pixel in focusing photosensitive unit is divided into two parts of upper and lower sides, photosensitive unit of focusing
In a part of photosensitive pixel can be in two photosensitive pixels on the upside of 2*2 photosensitive pixel, the photosensitive unit that will focus on
Focused as the first output valve, the then output valve of two " 2 " of downside in photosensitive unit of the output valve of two " 1 " of side is used as the
Two output valves.
Example three, is divided to focusing photosensitive unit from diagonal line side.
In this example, 2*2 photosensitive pixel in focusing photosensitive unit is divided into two parts according to two diagonal, will be left
The photosensitive pixel at upper angle and the photosensitive pixel in the lower right corner are as a part therein, the upper left corner and the right side in the photosensitive unit that will focus
The output valve of two " 1 " of inferior horn is used as second as the first output valve, the then output valve of two " 2 " in the lower left corner and the upper right corner
Output valve.
In an embodiment of the present invention, after it have read the first output valve and the second output valve, you can defeated according to first
Go out value and the second output valve obtains the poor information of first phase.
For example, with the output valve point for the photosensitive pixel for reading the 2*2 photosensitive pixel left and right sides of focusing photosensitive unit
Exemplified by not as the first output valve and the second output valve, the output valve in left side two " 1 " in focusing photosensitive unit can be first calculated
And as first phase information, then calculate in focusing photosensitive unit two " 2 " the output valve on right side and as the second phase
Position information, the poor information of first phase is used as eventually through the difference calculated between first phase information and second phase information.
In an embodiment of the present invention, by photosensitive unit of focusing 2*2 photosensitive pixel left and right sides photosensitive pixel it is defeated
Go out value respectively as the first output valve and the second output valve, the poor information of first phase of left and right directions can be detected；By focusing sense
In light unit above and below 2*2 photosensitive pixel the output valve of both sides photosensitive pixel respectively as the first output valve and the second output valve,
The poor information of first phase of above-below direction can be detected；By the output of the photosensitive pixel in photosensitive unit of focusing on two diagonal
Value can detect the poor information of oblique first phase respectively as the first output valve and the second output valve.
Alternatively, in one embodiment of the invention, the poor information of second phase of double-core focusing photosensitive pixel is read, can
With including：The output valve of the first photodiode is read, the 3rd output valve is used as；The output valve of the second photodiode is read,
It is used as the 4th output valve；The poor information of second phase is obtained according to the 3rd output valve and the 4th output valve.
Still by taking Fig. 3 as an example, in Fig. 3, the calculation of the poor information of second phase of all double-core focusing photosensitive pixels is identical,
Only it is illustrated herein exemplified by calculating the poor information of the second phase in Fig. 3 at Gr.The output valve conduct of " 1 " at Gr is read first
3rd output valve, then the output valve for reading at Gr " 2 " are obtained as the 4th output valve according to the 3rd output valve and the 4th output valve
Second phase difference information, such as, can be used as second phase by calculating the difference between the 3rd output valve and the 4th output valve
Poor information.
S63, focusing control is carried out according to the poor information of first phase and the poor information of second phase.
In an embodiment of the present invention, it is photosensitive in the poor information of first phase that have read focusing photosensitive unit and double-core focusing
After the poor information of the second phase of unit, you can carry out focusing control according to the poor information of first phase and the poor information of second phase.
It is typically the output according to two photodiodes in double-core focusing photosensitive pixel in related double-core focusing technology
Value calculates phase difference, thus calculates the drive volume and driving direction of camera lens, and then realize focusing.Under low luminous environment, focusing
Speed is slower.
And in an embodiment of the present invention, a white filter unit being covered based on the first lenticule, a white filters
Unit covers a focusing photosensitive unit, by using white filter unit, remains to obtain bigger thang-kng amount under low luminous environment
The poor information of first phase supply focusing process, and then lift the focusing speed under low luminous environment.
The focusing control method of the double-core focus image sensor of the embodiment of the present invention, based on the first lenticule covering
One white filter unit, a white filter unit covers each photosensitive in a focusing photosensitive unit, focusing photosensitive unit
The fan-shaped photodiode of pixel correspondence one, second lenticule covers a double-core focusing photosensitive pixel, passes through reading pair
The poor information of second phase of the poor information of the first phase of burnt photosensitive unit and double-core focusing photosensitive pixel, and it is poor according to first phase
Information and the poor information of second phase carry out focusing control, by increasing capacitance it is possible to increase the thang-kng amount of focusing pixel, are effectively lifted under low luminous environment
Focusing speed.
It should be appreciated that the purpose of focusing is to obtain the photo that definition is higher.In actual applications, complete
After focusing process, generally also include further imaging process, so that, as shown in figure 8, on the basis of shown in above-mentioned Fig. 6,
Also include after step S63：
S81, control photosensitive unit array enters imaging pattern.
In an embodiment of the present invention, after focusing control is completed, further control photosensitive unit array enters imaging
Pattern.
S82, control photosensitive unit array is exposed, and reads the output valve of photosensitive unit array, to obtain photosensitive list
The pixel value of element array is so as to generate image.
Wherein, the pixel value of focusing photosensitive unit is obtained by interpolation retrieving algorithm.
In an embodiment of the present invention, after photosensitive unit array enters imaging pattern, control photosensitive unit array enters
Row exposure, and the output valve of photosensitive unit array is read, and then obtain the pixel value generation image of photosensitive unit array.
In one embodiment of the invention, read the output valve of photosensitive unit array and then obtain photosensitive unit array
Pixel value, can include：Read in double-core focusing photosensitive pixel after the output valve of two photodiodes, by two poles of photoelectricity two
The output valve of pipe is added the pixel value for obtaining double-core focusing photosensitive pixel；Focusing photosensitive unit is obtained using interpolation retrieving algorithm
Pixel value, wherein, interpolation retrieving algorithm can be that arest neighbors interpolation algorithm, bilinear interpolation algorithm and cube sum are calculated
Any one in method.
For the sake of simplicity, the pixel value of focusing photosensitive unit can be obtained using arest neighbors interpolation algorithm, that is, select from this pair
The gray value of the input pixel of the position that burnt photosensitive unit is be mapped to recently is as interpolation result, that is, the photosensitive list of the focusing
The pixel value of member.
Fig. 9 is the schematic diagram that focusing photosensitive unit pixel value is obtained using interpolation algorithm.
As shown in figure 9, comprising four photosensitive pixels in white filter unit (white portion in figure), in order to export picture
The preferable image of matter is needed to calculate and obtains each light-sensitive image, it is necessary to enter row interpolation reduction to the output valve of each photosensitive pixel
The rgb value of element.Can using the pixel average of neighborhood territory pixel as the photosensitive pixel pixel value.To calculate white filter unit
Exemplified by the rgb value at the middle upper left corner " 1 " place, for convenience of description, the R pixel values at the upper left corner " 1 " place are designated as R10, G pixel values are designated as
G10, B pixel values are designated as B10, calculation formula is distinguished as follows：
It should be noted that in white filter unit the lower left corner " 1 " place, the upper right corner " 2 " place and the lower right corner " 2 " place RGB
The interpolation restoring method of value similarly, is taken from adjacent pixel and enters row interpolation with the rgb value restoring method at the upper left corner " 1 " place
Reduction, it is unnecessary to avoid, no longer illustrate one by one herein.
It should be noted that the above-mentioned description to obtaining the algorithm for photosensitive unit pixel value of focusing is only used for illustrating this
Invention, and cannot function as limitation of the present invention.During actual treatment, to obtain more accurate pixel value, adjacent several pixels
Pixel value may be used to interpolation reduction, be not limited solely to the pixel value of adjacent pixel, wherein, the pixel value distribution for adjusting the distance near
Higher weight, the pixel value for adjusting the distance remote distributes relatively low weight, i.e. pixel value weight shared in interpolation retrieving algorithm
It is inversely proportional with the distance that is reduced pixel.
In an embodiment of the present invention, by after the pixel value reduction for photosensitive unit of focusing, you can according to photosensitive unit array
In each pixel pixel value generation image.
The focusing control method of the double-core focus image sensor of the embodiment of the present invention, the Perceived control after focusing control is completed
Light unit array enters imaging pattern, and controls photosensitive unit array to be exposed, by the output for reading photosensitive unit array
Value is to obtain the pixel value of photosensitive unit array so as to generating image, it is possible to increase image quality.
In order to realize above-described embodiment, the invention also provides a kind of double-core focus image sensor, Fig. 2 is according to this hair
The profile of the double-core focus image sensor of bright one embodiment, Fig. 3 is double-core according to an embodiment of the invention
The top view of focus image sensor.
Scheme it should be noted that being focused in the focusing control method embodiment of foregoing double-core focus image sensor to double-core
As the relevant explanation of sensor illustrates the double-core focus image sensor that is also applied for the embodiment of the present invention, its realization principle class
Seemingly, here is omitted.
The double-core focus image sensor of the embodiment of the present invention, includes the first lenticule and the second lenticule by setting
Microlens array, first lenticule covers a white filter unit, and a white filter unit covers a focusing sense
Each fan-shaped photodiode of photosensitive pixel correspondence one, the second lenticule covering one in light unit, focusing photosensitive unit
Individual double-core focusing photosensitive pixel, by increasing capacitance it is possible to increase the thang-kng amount of focusing pixel, is provided firmly to lift the focusing speed under low luminous environment
Part basis.
In order to realize above-described embodiment, the invention also provides a kind of imaging device, Figure 10 is according to an implementation of the invention
The structural representation of the imaging device of example.
As shown in Figure 10, the imaging device 1000 includes the double-core focus image sensor 100 and control of above-described embodiment
Module 1010.Wherein,
The control photosensitive unit array of control module 1010 enters focal modes, and the first phase for reading focusing photosensitive unit is poor
The poor information of second phase of information and double-core focusing photosensitive pixel, is carried out according to the poor information of first phase and the poor information of second phase
Focusing control.
Alternatively, in one embodiment of the invention, control module 1010 is used to read in focusing photosensitive unit one
Divide the output valve of photosensitive pixel and as the first output valve, read the output valve of another part photosensitive pixel in focusing photosensitive unit
And as the second output valve, the poor information of first phase is obtained according to the first output valve and the second output valve.
In an embodiment of the present invention, the double-core focusing photosensitive pixel in double-core focus image sensor 100 has two
Photodiode, respectively the first photodiode and the second photodiode.Therefore, control module 1010 is additionally operable to reading
The output valve of one photodiode, as the 3rd output valve, reads the output valve of the second photodiode, is used as the 4th output
Value, the poor information of second phase is obtained according to the 3rd output valve and the 4th output valve.
It should be appreciated that the purpose of focusing is to obtain the photo that definition is higher.In actual applications, complete
After focusing process, generally also include further imaging process, therefore, in one embodiment of the invention, control module
1010, which are additionally operable to control photosensitive unit array, enters imaging pattern, and control photosensitive unit array is exposed, and reads photosensitive list
The output valve of element array, to obtain the pixel value of photosensitive unit array so as to generate image, wherein, the pixel for photosensitive unit of focusing
Value is obtained by interpolation retrieving algorithm.
The imaging device of the embodiment of the present invention, covers a white filter unit, one white based on first lenticule
Color filter unit covers each fan-shaped pole of photoelectricity two of photosensitive pixel correspondence one in a focusing photosensitive unit, focusing photosensitive unit
Pipe, second lenticule covers a double-core focusing photosensitive pixel, is believed by the first phase difference for reading photosensitive unit of focusing
The poor information of second phase of breath and double-core focusing photosensitive pixel, and carried out according to the poor information of first phase and the poor information of second phase
Focusing control, by increasing capacitance it is possible to increase the thang-kng amount of focusing pixel, effectively lifts the focusing speed under low luminous environment.
In order to realize above-described embodiment, the invention also provides a kind of mobile terminal, Figure 11 is according to an implementation of the invention
The structural representation of the mobile terminal of example.
As shown in figure 11, the mobile terminal 1 100 includes housing 1101, processor 1102, memory 1103, circuit board
1104 and power circuit 1105, wherein, circuit board 1104 is placed in the interior volume that housing 1101 is surrounded, and processor 1102 and deposits
Reservoir 1103 is arranged on circuit board 1104；Power circuit 1105, for being powered for each circuit or device of mobile terminal；Deposit
Reservoir 1103 is used to store executable program code；Processor 1102 is by reading the executable program stored in memory 1103
Code runs program corresponding with executable program code, for performing the double-core focus image sensing in above-described embodiment
The focusing control method of device.
The mobile terminal of the embodiment of the present invention, covers a white filter unit, one white based on first lenticule
Color filter unit covers each fan-shaped pole of photoelectricity two of photosensitive pixel correspondence one in a focusing photosensitive unit, focusing photosensitive unit
Pipe, second lenticule covers a double-core focusing photosensitive pixel, is believed by the first phase difference for reading photosensitive unit of focusing
The poor information of second phase of breath and double-core focusing photosensitive pixel, and carried out according to the poor information of first phase and the poor information of second phase
Focusing control, by increasing capacitance it is possible to increase the thang-kng amount of focusing pixel, effectively lifts the focusing speed under low luminous environment.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
Represent in flow charts or logic and/or step described otherwise above herein, for example, being considered use
In the order list for the executable instruction for realizing logic function, it may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system including the system of processor or other can be held from instruction
The system of row system, device or equipment instruction fetch and execute instruction) use, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium " can any can be included, store, communicate, propagate or pass
Defeated program is for instruction execution system, device or equipment or the dress for combining these instruction execution systems, device or equipment and using
Put.The more specifically example (non-exhaustive list) of computer-readable medium includes following：Electricity with one or more wirings
Connecting portion (electronic installation), portable computer diskette box (magnetic device), random access memory (RAM), read-only storage
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, can even is that can be in the paper of printing described program thereon or other are suitable for computer-readable medium
Medium, because can then enter edlin, interpretation or if necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each several part of the present invention can be realized with hardware, software, firmware or combinations thereof.Above-mentioned
In embodiment, the software that multiple steps or method can in memory and by suitable instruction execution system be performed with storage
Or firmware is realized.If, and in another embodiment, can be with well known in the art for example, realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, the application specific integrated circuit with suitable combinational logic gate circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
It should be noted that in the description of this specification, reference term " one embodiment ", " some embodiments ", " show
The description of example ", " specific example " or " some examples " etc. mean to combine the specific features of the embodiment or example description, structure,
Material or feature are contained at least one embodiment of the present invention or example.In this manual, above-mentioned term is shown
The statement of meaning property is necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the spy of description
Point can in an appropriate manner be combined in any one or more embodiments or example.In addition, in the case of not conflicting,
Those skilled in the art can be by the not be the same as Example or example and non-be the same as Example described in this specification or example
Feature is combined and combined.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (18)
1. a kind of focusing control method of double-core focus image sensor, it is characterised in that the double-core focus image sensor
Including：Photosensitive unit array, the filter unit array being arranged on the photosensitive unit array and positioned at the filter unit battle array
Microlens array on row, wherein, the microlens array includes the first lenticule and the second lenticule, one described first
Lenticule covers a white filter unit, and a white filter unit covers a focusing photosensitive unit, the focusing
Photosensitive unit includes N*N photosensitive pixel, and each photosensitive pixel corresponds to a photodiode, and the photodiode is fan
Shape, second lenticule covers a double-core focusing photosensitive pixel, the described method comprises the following steps：
The photosensitive unit array is controlled to enter focal modes；
Read the poor information of first phase of the focusing photosensitive unit and the second phase difference letter of double-core focusing photosensitive pixel
Breath；
Focusing control is carried out according to the poor information of the first phase and the poor information of the second phase.
2. the method as described in claim 1, it is characterised in that read the poor information of first phase of the focusing photosensitive unit,
Including：
Read it is described focusing photosensitive unit in a part of photosensitive pixel output valve and be used as the first output valve；
Read it is described focusing photosensitive unit in another part photosensitive pixel output valve and be used as the second output valve；
The poor information of the first phase is obtained according to first output valve and the second output valve.
3. the method as described in claim 1, it is characterised in that the double-core focusing photosensitive pixel has two poles of photoelectricity two
Pipe, the first photodiode and the second photodiode, read the poor information of second phase of the double-core focusing photosensitive pixel, bag
Include：
The output valve of first photodiode is read, the 3rd output valve is used as；
The output valve of second photodiode is read, the 4th output valve is used as；
The poor information of the second phase is obtained according to the 3rd output valve and the 4th output valve.
4. the method as described in claim 1, it is characterised in that the double-core focusing photosensitive pixel is arranged as Bayer array.
5. the method as described in claim 1, it is characterised in that the microlens array includes horizontal center line and vertical center
Line, first lenticule is multiple, and the multiple first lenticule includes：
It is arranged on first group of first lenticule of the horizontal center line；With
It is arranged on second group of first lenticule of the vertical center line.
6. method as claimed in claim 5, it is characterised in that the microlens array includes four sidelines, the multiple the
One lenticule also includes：
It is arranged on the 3rd group of first lenticule in four sidelines.
7. method as claimed in claim 6, it is characterised in that first group of first lenticule and it is described second group first it is micro-
The lens density of lens is more than the lens density of the 3rd group of first lenticule.
8. the method as described in claim 1, it is characterised in that methods described also includes：
The photosensitive unit array is controlled to enter imaging pattern；
Control the photosensitive unit array to be exposed, and read the output valve of the photosensitive unit array, to obtain the sense
The pixel value of light unit array so as to generate image, wherein, the pixel value of the focusing photosensitive unit passes through interpolation retrieving algorithm
Obtain.
9. a kind of double-core focus image sensor, it is characterised in that including：
Photosensitive unit array；
It is arranged on the filter unit array on the photosensitive unit array；
Microlens array on the filter unit array；
Wherein, the microlens array includes the first lenticule and the second lenticule, the first lenticule covering covering
One white filter unit, a white filter unit covers a focusing photosensitive unit, the focusing photosensitive unit bag
N*N photosensitive pixel is included, each photosensitive pixel corresponds to a photodiode, and the photodiode is sector, one second
Lenticule covers a double-core focusing photosensitive pixel.
10. double-core focus image sensor as claimed in claim 9, it is characterised in that the double-core focusing photosensitive pixel row
It is classified as Bayer array.
11. double-core focus image sensor as claimed in claim 9, it is characterised in that the microlens array includes level
Center line and vertical center line, first lenticule are multiple, and the multiple first lenticule includes：
It is arranged on first group of first lenticule of the horizontal center line；With
It is arranged on second group of first lenticule of the vertical center line.
12. double-core focus image sensor as claimed in claim 11, it is characterised in that the microlens array includes four
Sideline, the multiple first lenticule also includes：
It is arranged on the 3rd group of first lenticule in four sidelines.
13. double-core focus image sensor as claimed in claim 12, it is characterised in that first group of first lenticule and
The lens density of second group of first lenticule is more than the lens density of the 3rd group of first lenticule.
14. a kind of imaging device, it is characterised in that including：
Double-core focus image sensor as described in claim any one of 9-13；With
Control module, the control module controls the photosensitive unit array to enter focal modes；
Read the poor information of first phase of the focusing photosensitive unit and the second phase difference letter of double-core focusing photosensitive pixel
Breath；
Focusing control is carried out according to the poor information of the first phase and the poor information of the second phase.
15. imaging device as claimed in claim 14, it is characterised in that the control module specifically for：
Read it is described focusing photosensitive unit in a part of photosensitive pixel output valve and be used as the first output valve；
Read it is described focusing photosensitive unit in another part photosensitive pixel output valve and be used as the second output valve；
The poor information of the first phase is obtained according to first output valve and the second output valve.
16. imaging device as claimed in claim 14, it is characterised in that the double-core focusing photosensitive pixel has two photoelectricity
Diode, the first photodiode and the second photodiode, the control module specifically for：
The output valve of first photodiode is read, the 3rd output valve is used as；
The output valve of second photodiode is read, the 4th output valve is used as；
The poor information of the second phase is obtained according to the 3rd output valve and the 4th output valve.
17. imaging device as claimed in claim 14, it is characterised in that the control module is additionally operable to：
The photosensitive unit array is controlled to enter imaging pattern；
Control the photosensitive unit array to be exposed, and read the output valve of the photosensitive unit array, to obtain the sense
The pixel value of light unit array so as to generate image, wherein, the pixel value of the focusing photosensitive unit passes through interpolation retrieving algorithm
Obtain.
18. a kind of mobile terminal, including housing, processor, memory, circuit board and power circuit, wherein, the circuit board peace
The interior volume surrounded in the housing is put, the processor and the memory are arranged on the circuit board；The power supply
Circuit, for being powered for each circuit or device of the mobile terminal；The memory is used to store executable program code；
The processor is run and the executable program code by reading the executable program code stored in the memory
Corresponding program, for performing the focusing control of the double-core focus image sensor as any one of claim 1 to 8
Method.
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