CN107465874A

CN107465874A - A kind of dark current processing method and mobile terminal

Info

Publication number: CN107465874A
Application number: CN201710800257.9A
Authority: CN
Inventors: 谢莲花
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2017-09-07
Filing date: 2017-09-07
Publication date: 2017-12-12
Anticipated expiration: 2037-09-07
Also published as: CN107465874B

Abstract

The present invention, which provides a kind of dark current processing method and mobile terminal, this method, to be included：During camera gathers preview image, the current sensor yield value of imaging sensor is obtained；Based on the corresponding relation between the current sensor yield value and default sensor gain and dark current, the dark current value of each dark pixel in the photosensitive pixel region of described image sensor is determined；Wherein, dark pixel is distributed with the photosensitive pixel region.When the present invention gathers preview image by the corresponding relation between default sensor gain and dark current and the camera of terminal, the current sensor yield value of imaging sensor, determine the dark current value of each dark pixel in the photosensitive pixel of imaging sensor, so, when subsequently dark current is deducted and handled, local dark current can be more accurately handled, dark current is avoided the occurrence of and deals with the colour cast problem for causing captured image improperly.

Description

A kind of dark current processing method and mobile terminal

Technical field

The present invention relates to communication technical field, more particularly to a kind of dark current processing method and mobile terminal.

Background technology

Due to impurity, the influence of the reason such as heated, physical device is unlikely to be absolute ideal.As cmos sensor is not having There is illumination to be mapped on pixel cell, can also produce electric charge.By electric current caused by these electric charges dark current.Wherein, dark current With illumination caused by electric charge be difficult distinguish.

At present, the mode for deducting dark current is typically that some sensitive pixel elements screening of sensor internal arrangement is black, is led to Dark current caused by crossing simulation other factors, dark current is counted, calculated and deducted.

Calculated using existing dark current and deduct technology, the medium, heating in different zones pixel cell exist larger During difference, it is difficult to allow each picture area to reach optimum efficiency；Further, with WDR (wide dynamic range, Wide Dynamic Range) the application of sensor, existing dark current calculate and deduct technology, and the region for also resulting in different exposure settings is secretly electric There is colour cast problem because deduction is improper in stream.

The content of the invention

The embodiment of the present invention provides a kind of dark current processing method and mobile terminal, secretly electric to solve conventional images sensor Picture colour cast problem existing for the calculating of stream.

In a first aspect, the embodiment of the present invention provides a kind of dark current processing method, including：

During camera gathers preview image, the current sensor yield value of imaging sensor is obtained；

Based on the corresponding relation between the current sensor yield value and default sensor gain and dark current, it is determined that The dark current value of each dark pixel in the photosensitive pixel region of described image sensor；

Wherein, dark pixel is distributed with the photosensitive pixel region.

Second aspect, the embodiment of the present invention provide a kind of mobile terminal, including：

First acquisition module, for when camera gathers preview image, the current sensor for obtaining imaging sensor to increase Benefit value；

Dark current determining module, for based on the current sensor yield value and default sensor gain and dark current Between corresponding relation, determine the dark current value of each dark pixel in the photosensitive pixel region of described image sensor；Wherein, institute State in photosensitive pixel region and dark pixel is distributed with.

The third aspect, the embodiment of the present invention provide a kind of mobile terminal, including：Memory, processor and it is stored in storage On device and the computer program that can run on the processor, the computer program are realized such as during the computing device The step of dark current processing method that first aspect of the embodiment of the present invention provides.

Fourth aspect, the embodiment of the present invention provide a kind of computer-readable recording medium, the computer-readable storage medium Computer program is stored with matter, is realized when the computer program is executed by processor as first aspect of the embodiment of the present invention carries The step of dark current processing method of confession.

In embodiments of the present invention, the corresponding relation between default sensor gain and dark current and terminal are passed through When camera gathers preview image, the current sensor yield value of imaging sensor, determine in the photosensitive pixel of imaging sensor The dark current value of each dark pixel, so, when subsequently dark current is deducted and handled, it can more accurately handle local dark electricity Stream, avoid the occurrence of dark current and deal with the colour cast problem for causing captured image improperly.

Brief description of the drawings

In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by institute in the description to the embodiment of the present invention The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these accompanying drawings Obtain other accompanying drawings.

Fig. 1 is the flow chart of the dark current processing method of one embodiment of the invention；

Fig. 2 is the dark current process flow figure of another embodiment of the present invention；

Fig. 3 is one of dark pixel distribution schematic diagram in photosensitive pixel region of imaging sensor of the embodiment of the present invention；

Fig. 4 is the dark current process flow figure of the another embodiment of the invention based on Fig. 2；

Fig. 5 is the dark current process flow figure of further embodiment of this invention；

Fig. 6 is the two of the dark pixel distribution schematic diagram in the photosensitive pixel region of the imaging sensor of the embodiment of the present invention；

Fig. 7 is the three of the dark pixel distribution schematic diagram in the photosensitive pixel region of the imaging sensor of the embodiment of the present invention；

Fig. 8 is the dark current process flow figure of the another embodiment of the invention based on Fig. 5；

Fig. 9 is the dark current process flow figure of the another embodiment of the invention based on Fig. 1；

Figure 10 is the dark current process flow figure of the another embodiment of the invention based on Fig. 1；

Figure 11 is the mobile terminal structure schematic diagram that one embodiment of the invention provides；

Figure 12 is the mobile terminal structure schematic diagram that another embodiment of the present invention provides；

Figure 13 is the mobile terminal structure schematic diagram that further embodiment of this invention provides；

Figure 14 is the mobile terminal structure schematic diagram that yet another embodiment of the invention provides.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is part of the embodiment of the present invention, rather than whole embodiments.Based on this hair Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made Example, belongs to the scope of protection of the invention.

As shown in figure 1, the dark current process flow figure for the embodiment of the present invention.Below should figure illustrate the party The implementation process of method.

Step 101, when camera gathers preview image, the current sensor yield value of imaging sensor is obtained.

Step 102, based on corresponding between the current sensor yield value and default sensor gain and dark current Relation, determine the dark current value of each dark pixel in the photosensitive pixel region of described image sensor；Wherein, the photosensitive pixel Dark pixel is distributed with region.

It should be noted that imaging sensor is to utilize surface photoelectric device made of microelectric technique, the light in it is utilized Quick unit (i.e. pixel photosite) array, is converted into electric charge by light by the photoelectric effect of semiconductor and is collected, then Voltage signal is converted further into, so as to form the electronic image corresponding to scenery, each of which photosensitive unit correspondence image In a pixel.

The photosensitive pixel region of the imaging sensor of the present invention is made up of multiple photosensitive units.

Specifically, being hidden black pixel cell in photosensitive pixel region is referred to as dark pixel.

Dark current processing method provided in an embodiment of the present invention, passes through pair between default sensor gain and dark current Should be related to and the camera of terminal collection preview image when, the current sensor yield value of imaging sensor, determine image pass The dark current value of each dark pixel in the photosensitive pixel of sensor, so, can be more accurate when subsequently dark current is deducted and handled The local dark current of ground processing, avoids the occurrence of dark current and deals with the colour cast problem for causing captured image improperly.

As shown in Fig. 2 the dark current process flow figure for another embodiment of the present invention.Below should figure illustrate The implementation process of this method.

Step 201, during camera gathers preview image, the current sensor yield value of imaging sensor is obtained；

Step 202, according to formulaCalculate described image sensor The dark current value of each dark pixel in photosensitive pixel region.

Wherein, the photosensitive pixel region includes：M × N number of photosensitive pixel subregion, each photosensitive pixel subregion Interior is distributed with least two dark pixels, and M, N are equal positive integer；OB_rRepresent the dark current of dark pixel in photosensitive pixel subregion； OB_crDemarcation dark current is represented, the demarcation dark current is used to represent under unglazed photographical condition, and corresponding when sensor gain is 1 The photosensitive pixel subregion in dark pixel current value；G represents sensor gain；G_bRepresent the basic gain of sensor；C_rTable Show the coefficient of relationship of the dark current of dark pixel and sensor gain in photosensitive pixel subregion；OBoffset_rRepresent different sensings The dark current difference average value of dark pixel in photosensitive pixel subregion under device gain.

Here, the photosensitive pixel region of imaging sensor is divided into M × N number of photosensitive pixel subregion.Need what is illustrated It is that pixel includes multiple photosensitive pixels (i.e. pixel photosite) in each photosensitive pixel subregion, and it is more that dark pixel is distributed in this In individual photosensitive pixel, as shown in Figure 3.

Specifically, the plurality of photosensitive pixel forms red pixel R passages, green pixel GB passages, green pixel GR passages With blue pixel channel B.

At least one dark pixel is distributed with each pixel access.

The above-mentioned arrangement mode by dark pixel compartmentalization, localization is advantageous to follow-up more accurately to the progress of local dark current Processing, avoids the occurrence of regional area colour cast problem caused by dark current is dealt with improperly.

Further, it is necessary to explanation, OB in above-mentioned dark current calculation formula_rIt is known variables with G, remaining is The amount of knowing, these known quantities are pre-stored within preset memory, such as the OTP that carries of imaging sensor or other are readable writeable Memory.

Preferably, as shown in figure 4, corresponding to dark pixel arrangement mode in this implementation, methods described step 202 it Before, in addition to：

Step 203, according to being distributed in each dark pixel in photosensitive pixel region in the described image sensor being obtained ahead of time Positional information, compensating bad point is carried out to each dark pixel.

Need exist for illustrating, the positional information of each dark pixel in photosensitive pixel region is pre-stored within default deposit In reservoir, such as the OTP or other readable writeable memories that imaging sensor carries.

Here, due to being distributed with dark pixel in each photosensitive pixel subregion, because these dark pixels are not with photosensitive Degree change, is presented the pixel of same color, can so directly affect picture quality, so being compensated to it, carry all the time Image quality is risen to be necessary.

Dead pixel compensation method can have many kinds, such as, it is replaced using the value of same pixel passage adjacent pixel；Or Person is replaced after being averaging using n adjacent pixel of same pixel passage；Or compensating bad point is carried out using median algorithm, finally Complete the compensating bad point to each dark pixel.

Dark current processing method provided in an embodiment of the present invention, include M × N number of photosensitive in the photosensitive pixel of imaging sensor Pixel subregion, at least two dark pixels each are distributed with the photosensitive pixel subregion, when M, N are equal positive integer, lead to When crossing the camera collection preview image of default dark current calculation formula and terminal, the current sensor gain of imaging sensor Value, calculate the dark current value of each dark pixel in the photosensitive pixel of imaging sensor, such dark pixel compartmentalization, localizes Arrangement mode is advantageous to subsequently more accurately handle local dark current, avoids the occurrence of regional area because dark current is handled not The colour cast problem caused by.

As shown in figure 5, the dark current process flow figure for further embodiment of this invention.Below should figure illustrate The implementation process of this method.

Step 301, during camera gathers preview image, the current sensor yield value of imaging sensor is obtained；

Step 302, according to formulaAnd formulaCalculate The dark current value of each dark pixel in the photosensitive pixel region of described image sensor.

Wherein, the photosensitive pixel region includes：Long exposed photosensitive pixel region with presetted pixel arrangement mode and Short exposure photosensitive pixel region；It is distributed with least according to the presetted pixel arrangement mode in the long exposed photosensitive pixel region Two long exposure dark pixel, at least two are distributed with according to the presetted pixel arrangement mode in the short exposure photosensitive pixel region Individual short exposure dark pixel；OB_lRepresent the dark current of long exposure dark pixel；OB_clRepresent the demarcation dark current value of long exposure dark pixel； G represents sensor gain；G_bRepresent the basic gain of sensor；C_lRepresent the long dark current for exposing dark pixel and sensor gain Coefficient of relationship；OBoffset_lRepresent the dark current difference average value of long exposure dark pixel under different sensors gain；OB_sRepresent short Expose the dark current of dark pixel；OB_csRepresent the demarcation dark current value of short exposure dark pixel；C_sRepresent the dark electricity of short exposure dark pixel The coefficient of relationship of stream and sensor gain；OBoffset_sRepresent that the dark current of short exposure dark pixel under different sensors gain is poor Different average value.

Here, presetted pixel arrangement mode has a variety of.Such as the row of the two row short exposure two length exposure in WDR sensor passes Sensor, zigzag length exposed light transducer etc..

Specifically, as shown in fig. 6, in photosensitive pixel region photosensitive pixel according to the row of two row short exposure two grow exposure arrangement, Wherein, dark pixel includes：Short exposure dark pixel and long exposure dark pixel, respectively positioned at the edge in photosensitive pixel region, also according to Two row short exposures and the length exposure arrangement of two rows.

As shown in fig. 7, photosensitive pixel arranges according to the long short exposure of zigzag in photosensitive pixel region, wherein, dark pixel bag Include：Short exposure dark pixel and long exposure dark pixel, are connected respectively zigzag short exposure pixel and the long exposing pixels of zigzag, Arranged according to zigzag pixel arrangements.

To sum up, such dark pixel arrangement mode, i.e., the pixel of different exposure settings connect different dark pixels, Neng Gouzhen Specific dark current processing is carried out to influence of the different exposure settings to picture pixel dark current.Long short exposure can so be avoided Picture dark current is inconsistent but uses colour cast problem caused by the processing of identical dark current.

Further, in above-mentioned two dark current calculation formula, long exposure dark pixel arrangement and the dark picture of short exposure are corresponded to respectively Element arrangement.Wherein it should be noted that OB_l、OB_sIt is known variables with G, remaining is known quantity, and these known quantities prestore In in preset memory, such as the OTP or other readable writeable memories that imaging sensor carries.

Preferably, corresponding to dark pixel arrangement mode in this implementation, as shown in figure 8, methods described step 302 it Afterwards, in addition to：

Step 303, pixel separation, generation are carried out to the original image after long short exposure of described image sensor output Long exposure image and short exposed images.

Here, imaging sensor determines that first pixel is after growing exposure or short exposure, according to zigzag arrangement mode (such as zig zag pattern), each pixel are assured that long exposure or short exposure.So just it can expose picture long Element extracts the one long exposure frame of generation, and short exposure pixel separation is out generated a short exposure frames.

Step 304, picture reconstruction, generation both full-pixel length exposure are carried out to the long exposure image and short exposed images respectively Image and both full-pixel short exposed images, wherein, the number of pixels of the long exposure image and the number of pixels of short exposed images are equal For the half of the number of pixels of the original image；The number of pixels and the both full-pixel of the long exposure image of both full-pixel The number of pixels of short exposed images is equal to the number of pixels of the original image.

It should be noted that because the long short exposure frames generated in step 303 all only have the half of original pixel, so needing Long short exposure frames are redeveloped into both full-pixel.For example short exposure frames recover, it is necessary to which original length is exposed into frame, can use The methods of adjacent pixel of short exposure weights is calculated, while increases directionality judgement, can reach the damage for lowering parsing power The purpose of mistake.

Dark current processing method provided in an embodiment of the present invention, include that there is default picture in the photosensitive pixel of imaging sensor During long exposed photosensitive pixel region and short exposure the photosensitive pixel region of plain arrangement mode, by default dark current calculation formula with And terminal camera collection preview image when, the current sensor yield value of imaging sensor, calculate the sense of imaging sensor The dark current value of each dark pixel in light pixel, the pixel of such different exposure settings connect the pixel row of different dark pixels Row mode, influence of the different exposure settings to picture pixel dark current can be directed to and carry out specific dark current processing, so may be used Avoid the picture dark current of long short exposure inconsistent but using colour cast problem caused by the processing of identical dark current.

On the basis of shown in Fig. 1, it is preferred that as shown in figure 9, before step 101, methods described also includes：

Step 103, under unglazed photographical condition, described image sensor is obtained respectively under different sensors gain, institute State the dark current value of each dark pixel in photosensitive pixel region.

Need exist for explanation be, it is necessary first to measure imaging sensor sensor gain be 1 when, the photosensitive pixel The dark current value of each dark pixel in region.It is moreover, each dark in the corresponding photosensitive pixel region when sensor gain is 1 The dark current value of pixel is stored in preset memory as demarcation dark current value, the OTP carried such as imaging sensor or its His readable writeable memory.

Step 104, according to the dark current value of each dark pixel under different sensors gain, different sensors gain is determined Corresponding relation between dark current.

Here, different sensors gain corresponds to the dark current value difference of each dark pixel in photosensitive pixel region.

This step specifically includes：

Step 1041, it is pre- to determine that the difference value between the dark current value of each dark pixel under different sensors gain is more than The dark current value of gating limit value；

Step 1042, it is more than according to the difference value between the dark current value of each dark pixel under different sensors gain pre- The dark current value of gating limit value, determine the coefficient of relationship of different sensors gain and dark current.

The implementation process of 103~step 104 of above-mentioned steps is illustrated with different dark pixel arrangement modes separately below.

1) photosensitive pixel region includes：M × N number of photosensitive pixel subregion, point in each photosensitive pixel subregion At least two dark pixels are furnished with, M, N are equal positive integer.

Specifically, it is 16 × 16 sub-regions by the photosensitive pixel region division of imaging sensor.

First, under unglazed photographical condition, i.e., under total darkness environment, when setting sensor gain is 1 times, claps picture and read Dark current value OB0, OB1, OB2OB255；

Here, the dark current value read in the step is burnt in the OTP that imaging sensor carries, the reading for the later stage Take calling.

Then, to set sensor gain be respectively 2 times, 4 times, 8 times, 12 times, 16 times until maximum sensor gain Under the conditions of clap picture, count the dark current value under the sensor gain that each photosensitive pixel subregion is set more than respectively, Calculate the dark current value difference under same photosensitive pixel subregion different sensors gain；

Here specifically, when dark current difference is less than the threshold value of setting, by the relation of dark current and sensor gain Coefficient is set to 1；When dark current difference is more than the threshold value of setting, then dark current and sensor gain are calculated by these values Coefficient of relationship C；

Here, OBoffset is dark current difference average value.

It should be noted that in this step, the dark current and the coefficient of relationship C and dark current of sensor gain that are calculated Difference average value OBoffset is burnt in the OTP that imaging sensor carries, and the reading for the later stage is called.

Finally, the dark current calculation formula under corresponding different sensors gain is obtained, i.e.,

It should be noted that the positional information of each dark pixel in each photosensitive pixel subregion is also burnt to image biography In the OTP that sensor carries, compensating bad point can be so done to rear end, reduces influence of the bad point to image definition.

2) photosensitive pixel region includes：Long exposed photosensitive pixel region and short exposure sense with presetted pixel arrangement mode Light pixel region；Wherein, at least two are distributed with according to the presetted pixel arrangement mode in the long exposed photosensitive pixel region Individual long exposure dark pixel, at least two are distributed with according to the presetted pixel arrangement mode in the short exposure photosensitive pixel region Short exposure dark pixel.

Here, by taking zigzag pixel arrangement as an example.

First, under unglazed photographical condition, i.e., under total darkness environment, when setting sensor gain is 1 times, claps picture and read The dark current value OB of long short exposure_s0 (short exposure current value), OB_l0 (long exposure current value)；

Then, to set sensor gain be respectively 2 times, 4 times, 8 times, 12 times, 16 times until maximum sensor gain Under the conditions of clap picture, count short exposure and the long dark current value being exposed under the sensor gain of above setting respectively, count respectively Calculate short exposure and the long dark current value difference being exposed under different sensors gain；

Here specifically, when dark current difference is less than the threshold value of setting, by the relation of dark current and sensor gain Coefficient is set to 1；When dark current difference is more than the threshold value of setting, then short exposure dark current and sensing are calculated by these values The coefficient of relationship C of device gain_sWith long exposure dark current and the coefficient of relationship C of sensor gain_l；

Here, OBoffset is dark current difference average value, including short exposure dark current difference average value OBoffset_sWith Long exposure dark current difference average value OBoffset_l。

It should be noted that in this step, the dark current and the coefficient of relationship C of sensor gain that are calculated_s、C_lIt is and dark Current difference average value OBoffset is burnt in the OTP that imaging sensor carries, and the reading for the later stage is called.

On the basis of shown in Fig. 1, it is preferred that as shown in Figure 10, after step 102, methods described also includes：

Step 105, by the dark current value of each dark pixel in the photosensitive pixel region from passing through described image sensor Deducted in each pixel of output.

Here it should be noted that, for it is above-mentioned by photosensitive pixel region division be several photosensitive pixel subregions dark picture In plain arrangement mode, the pixel of each photosensitive pixel subregion deducts the dark current value that the region is calculated.And in order to The dark current difference for avoiding neighboring photosensitive pixel subregion from calculating is too big, causes adjacent pixel deduction value difference different big, and produces Two adjacent row pixels of each region can be used weighted calculation dark current value, ensured by the unsmooth problem of raw color transition Cross flatness.

Long the exposed photosensitive pixel region and short exposure for including presetted pixel arrangement mode for photosensitive pixel region are photosensitive In the dark pixel arrangement mode of pixel region, respectively to each picture in both full-pixel short exposed images and the long exposure image of both full-pixel Element all deducts the dark current value calculated.

It should be noted that the deduction processing to dark current is to lift the matter for the image that imaging sensor captures Amount.

Further, this step is after dark current is deducted, and originally the pixel of saturation can become unsaturated, in order that pixel is still Saturation can so be reached, on the basis of dark current is deducted, multiplied by with a coefficient, allowing the pixel still saturation of saturation itself, and It is 0 pixel after deduction, 0 is remained as after being multiplied by coefficient；So, picture quality can further be lifted.

Step 106, picture signal processing is carried out to the picture signal after deduction dark current value, generates targets preview image.

Specifically, picture signal processing may include：BPC (bad pixel is corrected, Bad Pixel Correction) camera lens is rectified Just etc..

In summary, dark current processing method provided in an embodiment of the present invention, default sensor gain and dark electricity are passed through During the camera collection preview image of corresponding relation and terminal between stream, the current sensor yield value of imaging sensor, The dark current value of each dark pixel in the photosensitive pixel of imaging sensor is determined, so, when subsequently dark current is deducted and handled, Local dark current can be more accurately handled, dark current is avoided the occurrence of and deals with the colour cast problem for causing captured image improperly.

Figure 11 is the mobile terminal structure schematic diagram that one embodiment of the invention provides.As shown in figure 11, the mobile terminal 400 Including：

First acquisition module 401, for when camera gathers preview image, obtaining the current sensor of imaging sensor Yield value；

Dark current determining module 402, for based on the current sensor yield value and default sensor gain and secretly Corresponding relation between electric current, determine the dark current value of each dark pixel in the photosensitive pixel region of described image sensor；Its In, dark pixel is distributed with the photosensitive pixel region.

Preferably, the photosensitive pixel region includes：M × N number of photosensitive pixel subregion, each photosensitive pixel sub-district At least two dark pixels are distributed with domain, M, N are equal positive integer；

On the basis of Figure 11, alternatively, as shown in figure 12, the dark current determining module 402 may include：

First dark current determination sub-module 4021, for according to formulaMeter Calculate the dark current value of each dark pixel in the photosensitive pixel region of described image sensor；

Wherein, OB_rRepresent the dark current of dark pixel in photosensitive pixel subregion；OB_crRepresent demarcation dark current, the demarcation Dark current be used for represent under unglazed photographical condition, and sensor gain be 1 when the corresponding photosensitive pixel subregion in dark picture The current value of element；G represents sensor gain；G_bRepresent the basic gain of sensor；C_rRepresent dark pixel in photosensitive pixel subregion The coefficient of relationship of dark current and sensor gain；OBoffset_rRepresent in the photosensitive pixel subregion under different sensors gain The dark current difference average value of dark pixel.

Preferably, the photosensitive pixel region includes：Long exposed photosensitive pixel region with presetted pixel arrangement mode With short exposure photosensitive pixel region；

The dark current determining module 402 may include：

Second dark current determination sub-module 4022, for according to formulaWith FormulaCalculate each dark picture in the photosensitive pixel region of described image sensor The dark current value of element；

Wherein, at least two length are distributed with according to the presetted pixel arrangement mode in the long exposed photosensitive pixel region Dark pixel is exposed, at least two short exposures are distributed with according to the presetted pixel arrangement mode in the short exposure photosensitive pixel region Brightness pixel；

OB_lRepresent the dark current of long exposure dark pixel；OB_clRepresent the demarcation dark current value of long exposure dark pixel；G represents to pass Sensor gain；G_bRepresent the basic gain of sensor；C_lRepresent the dark current of long exposure dark pixel and the relation system of sensor gain Number；OBoffset_lRepresent the dark current difference average value of long exposure dark pixel under different sensors gain；OB_sRepresent that short exposure is dark The dark current of pixel；OB_csRepresent the demarcation dark current value of short exposure dark pixel；C_sRepresent the dark current and biography of short exposure dark pixel The coefficient of relationship of sensor gain；OBoffset_sRepresent that the dark current difference of short exposure dark pixel under different sensors gain is averaged Value.

Alternatively, the mobile terminal 400 also includes：

Compensating bad point module 403, during gathering preview image in camera, obtain imaging sensor works as forward pass After sensor yield value, based on the corresponding pass between the current sensor yield value and default sensor gain and dark current System, determines in the photosensitive pixel region of described image sensor before the dark current value of each dark pixel, according to what is be obtained ahead of time The positional information of each dark pixel in photosensitive pixel region is distributed in described image sensor, each dark pixel is carried out Compensating bad point.

Alternatively, the mobile terminal 400 also includes：

Pixel separation module 404, for based on the current sensor yield value and default sensor gain and secretly Corresponding relation between electric current, determine each dark pixel in the photosensitive pixel region of described image sensor dark current value it Afterwards, pixel separation is carried out to the original image after long short exposure of described image sensor output, generate long exposure image and Short exposed images；

Picture rebuilds module 405, for carrying out picture reconstruction, generation to the long exposure image and short exposed images respectively The long exposure image of both full-pixel and both full-pixel short exposed images, wherein, the number of pixels and short exposed images of the long exposure image Number of pixels be the original image number of pixels half；The number of pixels of the long exposure image of both full-pixel The number of pixels of the original image is equal to the number of pixels of the both full-pixel short exposed images.

Alternatively, the mobile terminal 400 also includes：

Second acquisition module 406, during gathering preview image in camera, obtain imaging sensor works as forward pass Before sensor yield value, under unglazed photographical condition, described image sensor is obtained respectively under different sensors gain, it is described The dark current value of each dark pixel in photosensitive pixel region；

Corresponding relation determining module 407, for the dark current value according to each dark pixel under different sensors gain, really Determine the corresponding relation between different sensors gain and dark current.

Specifically, the corresponding relation determining module 407 may include：

3rd dark current determination sub-module 4071, for determining the dark current of each dark pixel under different sensors gain Difference value between value is more than the dark current value of predetermined threshold value；

Corresponding relation determination sub-module 4072, for the dark current value according to each dark pixel under different sensors gain Between difference value be more than the dark current value of predetermined threshold value, determine the coefficient of relationship of different sensors gain and dark current.

Alternatively, the mobile terminal 400 also includes：

Module 408 is deducted, for based on the current sensor yield value and default sensor gain and dark current Between corresponding relation, determine in the photosensitive pixel region of described image sensor after the dark current value of each dark pixel, will The dark current value of each dark pixel is detained from each pixel exported by described image sensor in the photosensitive pixel region Remove；

Image processing module 409, for carrying out picture signal processing to the picture signal after deduction dark current value, generate mesh Mark preview image.

Mobile terminal provided in an embodiment of the present invention, dark current determining module pass through default sensor gain and dark current Between corresponding relation and the first acquisition module obtain terminal camera collection preview image when, imaging sensor work as Front sensor yield value, the dark current value of each dark pixel in the photosensitive pixel of imaging sensor is determined, so, subsequently dark When electric current deducts processing, can more accurately handle local dark current, avoid the occurrence of dark current deal with improperly cause it is captured The colour cast problem of image.

The embodiment of the present invention also provides a kind of mobile terminal, including processor, memory, is stored on the memory simultaneously The computer program that can be run on the processor, above-mentioned dark electricity is realized when the computer program is by the computing device Each process of method for stream processing embodiment, and identical technique effect can be reached, to avoid repeating, repeat no more here.

The embodiment of the present invention also provides a kind of computer-readable recording medium, and meter is stored with computer-readable recording medium Calculation machine program, the computer program realize each process of above-mentioned dark current processing method embodiment when being executed by processor, And identical technique effect can be reached, to avoid repeating, repeat no more here.Wherein, described computer-readable recording medium, Such as read-only storage (Read-Only Memory, abbreviation ROM), random access memory (Random Access Memory, letter Claim RAM), magnetic disc or CD etc..

As shown in figure 13, the mobile terminal structure schematic diagram provided for further embodiment of this invention.Movement shown in Figure 13 Terminal 500, including：

At least one processor 501, memory 502, camera 506, at least one network interface 504 and user interface 503.Each component in mobile terminal 500 is coupled by bus system 505.It is understood that bus system 505 is used in fact Connection communication between these existing components.Bus system 505 is in addition to including data/address bus, in addition to power bus, control are always Line and status signal bus in addition.But for the sake of clear explanation, various buses are all designated as bus system 505 in fig. 13.

Wherein, user interface 503 can include display, keyboard or pointing device (for example, mouse, trace ball (trackball), touch-sensitive plate or touch-screen etc..

Wherein, camera 506 can include camera lens, motor, colour filter, base, imaging sensor 5061, motor driving core The periphery such as piece, circuit base plate, connector, electric capacity component.

It is appreciated that the memory 502 in the embodiment of the present invention can be volatile memory or nonvolatile memory, Or it may include both volatibility and nonvolatile memory.Wherein, nonvolatile memory can be read-only storage (Read- Only Memory, ROM), programmable read only memory (Programmable ROM, PROM), the read-only storage of erasable programmable Device (Erasable PROM, EPROM), Electrically Erasable Read Only Memory (Electrically EPROM, EEPROM) or Flash memory.Volatile memory can be random access memory (Random Access Memory, RAM), and it is used as outside high Speed caching.By exemplary but be not restricted explanation, the RAM of many forms can use, such as static RAM (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), Synchronous Dynamic Random Access Memory (Synchronous DRAM, SDRAM), double data speed synchronous dynamic RAM (Double Data Rate SDRAM, DDRSDRAM), enhanced Synchronous Dynamic Random Access Memory (Enhanced SDRAM, ESDRAM), synchronized links Dynamic random access memory (Synch link DRAM, SLDRAM) and direct rambus random access memory (Direct Rambus RAM, DRRAM).The memory 502 of system and method described herein be intended to including but not limited to these and it is any its It is adapted to the memory of type.

In some embodiments, memory 502 stores following element, can perform module or data structure, or Their subset of person, or their superset：Operating system 5021 and application program 5022.

Wherein, operating system 5021, comprising various system programs, such as ccf layer, core library layer, driving layer etc., it is used for Realize various basic businesses and the hardware based task of processing.Application program 5022, include various application programs, such as media Player (Media Player), browser (Browser) etc., for realizing various applied business.Realize the embodiment of the present invention The program of method may be embodied in application program 3022.

In embodiments of the present invention, mobile terminal 500 also includes：It is stored in memory 502 and can be transported on processor 501 Capable computer program, can be the computer program in application program 5022, computer program is by processor specifically 501 realize following steps when performing：During camera gathers preview image, the current sensor for obtaining imaging sensor increases Benefit value；Based on the corresponding relation between the current sensor yield value and default sensor gain and dark current, institute is determined State the dark current value of each dark pixel in the photosensitive pixel region of imaging sensor；Wherein, it is distributed in the photosensitive pixel region There is dark pixel.

Explanation is needed exist for, the corresponding relation between sensor gain and dark current can be stored in memory 502, Processor 501 can call the corresponding relation between sensor gain and dark current in memory 502.

Alternatively, the processor 501 is used for：According to formulaMeter Calculate the dark current value of each dark pixel in the photosensitive pixel region of described image sensor；

Need exist for explanation, demarcation dark current, the basic gain of sensor, in photosensitive pixel subregion dark pixel dark electricity The dark current of stream and dark pixel in the photosensitive pixel subregion under the coefficient of relationship of sensor gain and different sensors gain Difference average value can be stored in memory 502, and processor 501 can call demarcation dark current, sensor in memory 502 basic In gain, photosensitive pixel subregion under the dark current of dark pixel and the coefficient of relationship of sensor gain and different sensors gain Photosensitive pixel subregion in dark pixel dark current difference average value.

Alternatively, the processor 501 is used for：According to formulaAnd formulaCalculate each dark pixel in the photosensitive pixel region of described image sensor Dark current value；

Need exist for explanation, the demarcation dark current value of long exposure dark pixel, the demarcation of short exposure dark pixel secretly, electric current It is worth coefficient of relationship, the dark electricity of short exposure dark pixel of the basic gain of sensor, the dark current of long exposure dark pixel and sensor gain Stream is with the dark current difference average value of long exposure dark pixel under the coefficient of relationship of sensor gain, different sensors gain and not Dark current difference average value with short exposure dark pixel under sensor gain can be stored in memory 502, and processor 501 is adjustable With the long demarcation dark current value for exposing dark pixel in memory 502, the demarcation of short exposure dark pixel is dark, current value sensor is basic Coefficient of relationship, the dark current and sensor of short exposure dark pixel of gain, the dark current of long exposure dark pixel and sensor gain The dark current difference average value of long exposure dark pixel and different sensors increase under the coefficient of relationship of gain, different sensors gain The dark current difference average value of the lower short exposure dark pixel of benefit.

Alternatively, the processor 501 is used for：Photosensitive pixel is distributed in according in the described image sensor being obtained ahead of time The positional information of each dark pixel in region, compensating bad point is carried out to each dark pixel.

Explanation is needed exist for, the positional information of each dark pixel can be stored in memory 502, and processor 501 can Call the positional information of each dark pixel in memory 502.

Alternatively, the processor 501 is used for：To the original image after long short exposure of described image sensor output Pixel separation is carried out, generates long exposure image and short exposed images；The long exposure image and short exposed images are carried out respectively Picture is rebuild, the long exposure image of generation both full-pixel and both full-pixel short exposed images；Wherein, the number of pixels of the long exposure image Number of pixels with short exposed images is the half of the number of pixels of the original image；The long exposure diagram of both full-pixel The number of pixels of picture and the number of pixels of the both full-pixel short exposed images are equal to the number of pixels of the original image.

Alternatively, the processor 501 is used for：Under unglazed photographical condition, described image sensor is obtained respectively not With under sensor gain, the dark current value of each dark pixel in the photosensitive pixel region；According under different sensors gain The dark current value of each dark pixel, determines the corresponding relation between different sensors gain and dark current.

Alternatively, the processor 501 is used for：Determine each dark pixel under different sensors gain dark current value it Between difference value be more than predetermined threshold value dark current value；According to the dark current value of each dark pixel under different sensors gain Between difference value be more than the dark current value of predetermined threshold value, determine the coefficient of relationship of different sensors gain and dark current.

Explanation is needed exist for, predetermined threshold value can be stored in memory 502, and processor 501 can call memory Predetermined threshold value in 502.

Alternatively, the processor 501 is used for：By the dark current value of each dark pixel in the photosensitive pixel region from logical Cross in each pixel of described image sensor output and deduct；Picture signal after deduction dark current value is carried out at picture signal Reason, generate targets preview image.

The terminal of the present invention such as can be mobile phone, tablet personal computer, personal digital assistant (Personal Digital Assistant, PDA) or vehicle-mounted computer etc. mobile terminal.

Mobile terminal 500 can realize each process that terminal is realized in previous embodiment, to avoid repeating, here no longer Repeat.

The mobile terminal 500 of the embodiment of the present invention, computer program realize following steps when being performed by processor 501： During camera collection preview image, the current sensor yield value of imaging sensor is obtained；Based on the current sensor Corresponding relation between yield value and default sensor gain and dark current, determine the photosensitive pixel area of described image sensor The dark current value of each dark pixel in domain；Wherein, dark pixel is distributed with the photosensitive pixel region, it is more accurate to so, it is possible The local dark current of ground processing, avoids the occurrence of dark current and deals with the colour cast problem for causing captured image improperly.

The method that the embodiments of the present invention disclose can apply in processor 501, or real by processor 501 It is existing.Processor 501 is probably a kind of IC chip, has the disposal ability of signal.In implementation process, the above method Each step can be completed by the integrated logic circuit of the hardware in processor 501 or the instruction of software form.Above-mentioned place Reason device 501 can be general processor, digital signal processor (Digital Signal Processor, DSP), special integrated Circuit (Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field Programmable Gate Array, FPGA) either other PLDs, discrete gate or transistor logic, Discrete hardware components.It can realize or perform disclosed each method, step and the logic diagram in the embodiment of the present invention.It is general Processor can be microprocessor or the processor can also be any conventional processor etc..With reference to institute of the embodiment of the present invention The step of disclosed method, can be embodied directly in hardware decoding processor and perform completion, or with the hardware in decoding processor And software module combination performs completion.Software module can be located at random access memory, flash memory, read-only storage, may be programmed read-only In the ripe computer-readable recording medium in this area such as memory or electrically erasable programmable memory, register.The meter Calculation machine readable storage medium storing program for executing is located at memory 502, and processor 501 reads the information in memory 502, is completed with reference to its hardware The step of stating method.Specifically, screenshotss processing routine is stored with the computer-readable recording medium, screenshotss processing routine is located Manage each step realized when device 501 performs such as above-mentioned screenshotss embodiment of the method.

It is understood that embodiments described herein can use hardware, software, firmware, middleware, microcode or its Combine to realize.Realized for hardware, processing unit can be realized in one or more application specific integrated circuit (Application Specific Integrated Circuits, ASIC), digital signal processor (Digital Signal Processing, DSP), digital signal processing appts (DSP Device, DSPD), programmable logic device (Programmable Logic Device, PLD), field programmable gate array (Field-Programmable Gate Array, FPGA), general processor, In controller, microcontroller, microprocessor, other electronic units for performing herein described function or its combination.

Realize, can be realized herein by performing the module (such as process, function etc.) of function described herein for software Described technology.Software code is storable in memory and passes through computing device.Memory can within a processor or Realized outside processor.

As shown in figure 14, the mobile terminal structure schematic diagram provided for yet another embodiment of the invention.Movement shown in Figure 14 Terminal 600, including：

Radio frequency (Radio Frequency, RF) circuit 610, memory 620, input block 630, display unit 640, take the photograph As first 650, processor 660, voicefrequency circuit 670, WiFi (Wireless Fidelity) modules 680 and power supply 690.

Wherein, input block 630 can be used for the numeral or character information for receiving user's input, and produce and terminal 600 User set and function control it is relevant signal input.Specifically, in the embodiment of the present invention, the input block 630 can be with Including contact panel 631.Contact panel 631, also referred to as touch-screen, collect touch operation (ratio of the user on or near it Such as user uses the operation of finger, any suitable object of stylus or annex on contact panel 631), and according to setting in advance Fixed formula drives corresponding attachment means.Optionally, contact panel 631 may include touch detecting apparatus and touch controller two Individual part.Wherein, the touch orientation of touch detecting apparatus detection user, and the signal that touch operation is brought is detected, signal is passed Give touch controller；Touch controller receives touch information from touch detecting apparatus, and is converted into contact coordinate, then Give the processor 660, and the order sent of reception processing device 660 and can be performed.Furthermore, it is possible to using resistance-type, electricity The polytypes such as appearance formula, infrared ray and surface acoustic wave realize contact panel 631.Except contact panel 631, input block 630 Can also include other input equipments 632, other input equipments 632 can include but is not limited to physical keyboard, function key (such as Volume control button, switch key etc.), trace ball, mouse, the one or more in action bars etc..

Wherein, display unit 640 can be used for display by the information of user's input or be supplied to the information and terminal of user 600 various menu interfaces.Display unit 640 may include display panel 641, optionally, can use LCD or organic light emission two The forms such as pole pipe (Organic Light-Emitting Diode, OLED) configure display panel 641.

It should be noted that contact panel 631 can cover display panel 641, touch display screen is formed, when the touch display screen is examined After measuring the touch operation on or near it, processor 660 is sent to determine the type of touch event, is followed by subsequent processing device 660 provide corresponding visual output according to the type of touch event in touch display screen.

Wherein, camera 650 can include camera lens, motor, colour filter, base, imaging sensor 651, motor driving core The periphery such as piece, circuit base plate, connector, electric capacity component.

Touch display screen includes Application Program Interface viewing area and conventional control viewing area.The Application Program Interface viewing area And arrangement mode of the conventional control viewing area does not limit, can be arranged above and below, left-right situs etc. can distinguish two it is aobvious Show the arrangement mode in area.The Application Program Interface viewing area is displayed for the interface of application program.Each interface can be with The interface element such as the icon comprising at least one application program and/or widget desktop controls.The Application Program Interface viewing area It can also be the empty interface not comprising any content.The conventional control viewing area is used to show the higher control of utilization rate, for example, Application icons such as settings button, interface numbering, scroll bar, phone directory icon etc..

Wherein processor 660 is the control centre of mobile terminal 600, utilizes various interfaces and connection whole mobile phone Various pieces, by running or performing the software program and/or module that are stored in first memory 621, and call storage Data in second memory 622, the various functions and processing data of mobile terminal 600 are performed, so as to mobile terminal 600 Carry out integral monitoring.Optionally, processor 660 may include one or more processing units.

In embodiments of the present invention, mobile terminal 600 also includes：It is stored in first memory 621 and can be in processor 660 The dark current processing routine of upper operation and the data that can be called in second memory 622 and by processor 660 are stored in, specifically Ground, dark current processing routine realize following steps when being performed by processor 660：During camera gathers preview image, obtain Take the current sensor yield value of imaging sensor；Based on the current sensor yield value and default sensor gain and secretly Corresponding relation between electric current, determine the dark current value of each dark pixel in the photosensitive pixel region of described image sensor；Its In, dark pixel is distributed with the photosensitive pixel region.

Explanation is needed exist for, the corresponding relation between sensor gain and dark current can be stored in second memory In 622, processor 660 can call the corresponding relation between sensor gain and dark current in second memory 622.

Alternatively, the processor 660 is used for：According to formulaMeter Calculate the dark current value of each dark pixel in the photosensitive pixel region of described image sensor；

Need exist for explanation, demarcation dark current, the basic gain of sensor, in photosensitive pixel subregion dark pixel dark electricity The dark current of stream and dark pixel in the photosensitive pixel subregion under the coefficient of relationship of sensor gain and different sensors gain Difference average value can be stored in second memory 622, processor 660 can call demarcation dark current in second memory 622, The dark current of dark pixel and the coefficient of relationship of sensor gain and different sensings in the basic gain of sensor, photosensitive pixel subregion The dark current difference average value of dark pixel in photosensitive pixel subregion under device gain.

Alternatively, the processor 660 is used for：According to formulaAnd formulaCalculate each dark pixel in the photosensitive pixel region of described image sensor Dark current value；

Need exist for explanation, the demarcation dark current value of long exposure dark pixel, the demarcation of short exposure dark pixel secretly, electric current It is worth coefficient of relationship, the dark electricity of short exposure dark pixel of the basic gain of sensor, the dark current of long exposure dark pixel and sensor gain Stream is with the dark current difference average value of long exposure dark pixel under the coefficient of relationship of sensor gain, different sensors gain and not Dark current difference average value with short exposure dark pixel under sensor gain can be stored in second memory 622, processor 660 Can call the demarcation dark current value of the long exposure dark pixel in second memory 622, short exposure dark pixel demarcation secretly, current value Coefficient of relationship, the dark current of short exposure dark pixel of the basic gain of sensor, the dark current of long exposure dark pixel and sensor gain The dark current difference average value and difference of long exposure dark pixel under coefficient of relationship, different sensors gain with sensor gain The dark current difference average value of short exposure dark pixel under sensor gain.

Alternatively, the processor 660 is used for：Photosensitive pixel is distributed in according in the described image sensor being obtained ahead of time The positional information of each dark pixel in region, compensating bad point is carried out to each dark pixel.

Explanation is needed exist for, the positional information of each dark pixel can be stored in second memory 622, processor 660 can call the positional information of each dark pixel in second memory 622.

Alternatively, the processor 660 is used for：To the original image after long short exposure of described image sensor output Pixel separation is carried out, generates long exposure image and short exposed images；The long exposure image and short exposed images are carried out respectively Picture is rebuild, the long exposure image of generation both full-pixel and both full-pixel short exposed images；Wherein, the number of pixels of the long exposure image Number of pixels with short exposed images is the half of the number of pixels of the original image；The long exposure diagram of both full-pixel The number of pixels of picture and the number of pixels of the both full-pixel short exposed images are equal to the number of pixels of the original image.

Alternatively, the processor 660 is used for：Under unglazed photographical condition, described image sensor is obtained respectively not With under sensor gain, the dark current value of each dark pixel in the photosensitive pixel region；According under different sensors gain The dark current value of each dark pixel, determines the corresponding relation between different sensors gain and dark current.

Alternatively, the processor 660 is used for：Determine each dark pixel under different sensors gain dark current value it Between difference value be more than predetermined threshold value dark current value；According to the dark current value of each dark pixel under different sensors gain Between difference value be more than the dark current value of predetermined threshold value, determine the coefficient of relationship of different sensors gain and dark current.

Explanation is needed exist for, predetermined threshold value can be stored in second memory 622, and processor 660 can call the Predetermined threshold value in two memories 622.

Alternatively, the processor 660 is used for：By the dark current value of each dark pixel in the photosensitive pixel region from logical Cross in each pixel of described image sensor output and deduct；Picture signal after deduction dark current value is carried out at picture signal Reason, generate targets preview image.

Mobile terminal 600 provided in an embodiment of the present invention, following step is realized when computer program is performed by processor 660 Suddenly：During camera gathers preview image, the current sensor yield value of imaging sensor is obtained；Work as forward pass based on described Corresponding relation between sensor yield value and default sensor gain and dark current, determine the light-sensitive image of described image sensor The dark current value of each dark pixel in plain region；Wherein, dark pixel is distributed with the photosensitive pixel region, so, it is possible more Local dark current is handled exactly, is avoided the occurrence of dark current and is dealt with the colour cast problem for causing captured image improperly.

Mobile terminal 600 can realize each process that terminal is realized in previous embodiment, to avoid repeating, here no longer Repeat.

Those of ordinary skill in the art are it is to be appreciated that the list of each example described with reference to the embodiments described herein Member and algorithm steps, it can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually Performed with hardware or software mode, application-specific and design constraint depending on technical scheme.Professional and technical personnel Described function can be realized using distinct methods to each specific application, but this realization is it is not considered that exceed The scope of the present invention.

It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.

In embodiment provided herein, it should be understood that disclosed apparatus and method, others can be passed through Mode is realized.For example, device embodiment described above is only schematical, for example, the division of the unit, is only A kind of division of logic function, can there is an other dividing mode when actually realizing, for example, multiple units or component can combine or Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual Between coupling or direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, device or unit Connect, can be electrical, mechanical or other forms.

The unit illustrated as separating component can be or may not be physically separate, show as unit The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs 's.

In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also That unit is individually physically present, can also two or more units it is integrated in a unit.

If the function is realized in the form of SFU software functional unit and is used as independent production marketing or in use, can be with It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words The part to be contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter Calculation machine software product is stored in a storage medium, including some instructions are causing a computer equipment (can be People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the present invention. And foregoing storage medium includes：USB flash disk, mobile hard disk, ROM, RAM, magnetic disc or CD etc. are various can be with store program codes Medium.

One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with The hardware of correlation is controlled to complete by computer program, described program can be stored in a computer read/write memory medium In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access Memory, RAM) etc..

Term " first ", " second " in description and claims of this specification etc. are for distinguishing similar pair As without for describing specific order or precedence.It should be appreciated that the data so used in the appropriate case can be with Exchange, so as to embodiments of the invention described herein, such as can be with addition to those for illustrating or describing herein Order is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover it is non-exclusive include, For example, contain that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly to list A little steps or unit, but may include not list clearly or for intrinsic its of these processes, method, product or equipment Its step or unit.

Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications It should be regarded as protection scope of the present invention.

Claims

A kind of 1. dark current processing method, it is characterised in that including：

During camera gathers preview image, the current sensor yield value of imaging sensor is obtained；

Based on the corresponding relation between the current sensor yield value and default sensor gain and dark current, it is determined that described The dark current value of each dark pixel in the photosensitive pixel region of imaging sensor；

Wherein, dark pixel is distributed with the photosensitive pixel region.
2. dark current processing method according to claim 1, it is characterised in that the photosensitive pixel region includes：M×N Individual photosensitive pixel subregion, at least two dark pixels each are distributed with the photosensitive pixel subregion, M, N are just whole Number；

The corresponding relation based between the current sensor yield value and default sensor gain and dark current, it is determined that In the photosensitive pixel region of described image sensor the step of the dark current value of each dark pixel, including：

According to formulaCalculate the photosensitive pixel region of described image sensor The dark current value of interior each dark pixel；

Wherein, OB_rRepresent the dark current of dark pixel in photosensitive pixel subregion；OB_crRepresent demarcation dark current, the dark electricity of demarcation Flow for representing under unglazed photographical condition, and dark pixel in corresponding photosensitive pixel subregion when sensor gain is 1 Current value；G represents sensor gain；G_bRepresent the basic gain of sensor；C_rRepresent the dark electricity of dark pixel in photosensitive pixel subregion The coefficient of relationship of stream and sensor gain；OBoffset_rRepresent dark picture in the photosensitive pixel subregion under different sensors gain The dark current difference average value of element.
3. dark current processing method according to claim 1, it is characterised in that the photosensitive pixel region includes：Have Long exposed photosensitive pixel region and short exposure the photosensitive pixel region of presetted pixel arrangement mode；

The corresponding relation based between the current sensor yield value and default sensor gain and dark current, it is determined that In the photosensitive pixel region of described image sensor the step of the dark current value of each dark pixel, including：

According to formulaAnd formulaMeter Calculate the dark current value of each dark pixel in the photosensitive pixel region of described image sensor；

Wherein, the exposure of at least two length is distributed with according to the presetted pixel arrangement mode in the long exposed photosensitive pixel region Dark pixel, it is dark according to the presetted pixel arrangement mode at least two short exposures to be distributed with the short exposure photosensitive pixel region Pixel；

OB_lRepresent the dark current of long exposure dark pixel；OB_clRepresent the demarcation dark current value of long exposure dark pixel；G represents sensor Gain；G_bRepresent the basic gain of sensor；C_lRepresent the dark current of long exposure dark pixel and the coefficient of relationship of sensor gain； OBoffset_lRepresent the dark current difference average value of long exposure dark pixel under different sensors gain；OB_sRepresent the dark picture of short exposure The dark current of element；OB_csRepresent the demarcation dark current value of short exposure dark pixel；C_sRepresent the dark current and sensing of short exposure dark pixel The coefficient of relationship of device gain；OBoffset_sRepresent the dark current difference average value of short exposure dark pixel under different sensors gain.
4. dark current processing method according to claim 2, it is characterised in that gather preview image process in camera In, after the step of obtaining the current sensor yield value of imaging sensor, based on the current sensor yield value and default Sensor gain and dark current between corresponding relation, determine each dark picture in the photosensitive pixel region of described image sensor Before the step of dark current value of element, methods described also includes：

It is right according to the positional information that each dark pixel in photosensitive pixel region is distributed in the described image sensor being obtained ahead of time Each dark pixel carries out compensating bad point.
5. dark current processing method according to claim 3, it is characterised in that described to be based on the current sensor gain Value and the corresponding relation between default sensor gain and dark current, are determined in the photosensitive pixel region of described image sensor After the step of dark current value of each dark pixel, methods described also includes：

Pixel separation is carried out to the original image after long short exposure of described image sensor output, generate long exposure image and Short exposed images；

Picture reconstruction, the long exposure image of generation both full-pixel and both full-pixel are carried out to the long exposure image and short exposed images respectively Short exposed images；

Wherein, the number of pixels of the long exposure image and the number of pixels of short exposed images are the pixel of the original image The half of number；The number of pixels of the long exposure image of both full-pixel and the number of pixels of the both full-pixel short exposed images It is equal to the number of pixels of the original image.
6. dark current processing method according to claim 1, it is characterised in that gather preview image process in camera In, before the step of obtaining the current sensor yield value of imaging sensor, methods described also includes：

Under unglazed photographical condition, described image sensor is obtained respectively under different sensors gain, the photosensitive pixel area The dark current value of each dark pixel in domain；

According to the dark current value of each dark pixel under different sensors gain, determine between different sensors gain and dark current Corresponding relation.
7. dark current processing method according to claim 6, it is characterised in that according to each under different sensors gain The dark current value of dark pixel, the step of determining the corresponding relation between different sensors gain and dark current, including：

Determine that the difference value between the dark current value of each dark pixel under different sensors gain is more than the dark of predetermined threshold value Current value；

The dark of predetermined threshold value is more than according to the difference value between the dark current value of each dark pixel under different sensors gain Current value, determine the coefficient of relationship of different sensors gain and dark current.
8. dark current processing method according to claim 1, it is characterised in that described to be based on the current sensor gain Value and the corresponding relation between default sensor gain and dark current, are determined in the photosensitive pixel region of described image sensor After the dark current value step of each dark pixel, methods described also includes：

By the dark current value of each dark pixel in the photosensitive pixel region from each picture exported by described image sensor Deducted in element；

Picture signal processing is carried out to the picture signal after deduction dark current value, generates targets preview image.
A kind of 9. mobile terminal, it is characterised in that including：

First acquisition module, for when camera gathers preview image, obtaining the current sensor yield value of imaging sensor；

Dark current determining module, for based between the current sensor yield value and default sensor gain and dark current Corresponding relation, determine the dark current value of each dark pixel in the photosensitive pixel region of described image sensor；Wherein, the sense Dark pixel is distributed with region in light pixel.
10. mobile terminal according to claim 9, it is characterised in that the photosensitive pixel region includes：M × N number of photosensitive Pixel subregion, at least two dark pixels each are distributed with the photosensitive pixel subregion, M, N are equal positive integer；

The dark current determining module includes：

First dark current determination sub-module, for according to formulaCalculate institute State the dark current value of each dark pixel in the photosensitive pixel region of imaging sensor；

Wherein, OB_rRepresent the dark current of dark pixel in photosensitive pixel subregion；OB_crRepresent demarcation dark current, the dark electricity of demarcation Flow for representing under unglazed photographical condition, and dark pixel in corresponding photosensitive pixel subregion when sensor gain is 1 Current value；G represents sensor gain；G_bRepresent the basic gain of sensor；C_rRepresent the dark electricity of dark pixel in photosensitive pixel subregion The coefficient of relationship of stream and sensor gain；OBoffset_rRepresent dark picture in the photosensitive pixel subregion under different sensors gain The dark current difference average value of element.
11. mobile terminal according to claim 9, it is characterised in that the photosensitive pixel region includes：With default picture Long exposed photosensitive pixel region and short exposure the photosensitive pixel region of plain arrangement mode；

The dark current determining module includes：

Second dark current determination sub-module, for according to formulaAnd formulaCalculate each dark pixel in the photosensitive pixel region of described image sensor Dark current value；

Wherein, the exposure of at least two length is distributed with according to the presetted pixel arrangement mode in the long exposed photosensitive pixel region Dark pixel, it is dark according to the presetted pixel arrangement mode at least two short exposures to be distributed with the short exposure photosensitive pixel region Pixel；

OB_lRepresent the dark current of long exposure dark pixel；OB_clRepresent the demarcation dark current value of long exposure dark pixel；G represents sensor Gain；G_bRepresent the basic gain of sensor；C_lRepresent the dark current of long exposure dark pixel and the coefficient of relationship of sensor gain； OBoffset_lRepresent the dark current difference average value of long exposure dark pixel under different sensors gain；OB_sRepresent the dark picture of short exposure The dark current of element；OB_csRepresent the demarcation dark current value of short exposure dark pixel；C_sRepresent the dark current and sensing of short exposure dark pixel The coefficient of relationship of device gain；OBoffset_sRepresent the dark current difference average value of short exposure dark pixel under different sensors gain.
12. mobile terminal according to claim 10, it is characterised in that the mobile terminal also includes：

Compensating bad point module, during gathering preview image in camera, the current sensor for obtaining imaging sensor increases After benefit value, based on the corresponding relation between the current sensor yield value and default sensor gain and dark current, really Determine in the photosensitive pixel region of described image sensor before the dark current value of each dark pixel, according to the figure being obtained ahead of time Positional information as being distributed in each dark pixel in photosensitive pixel region in sensor, bad point benefit is carried out to each dark pixel Repay.
13. mobile terminal according to claim 11, it is characterised in that the mobile terminal also includes：

Pixel separation module, for based between the current sensor yield value and default sensor gain and dark current Corresponding relation, determine in the photosensitive pixel region of described image sensor after the dark current value of each dark pixel, to described The original image after long short exposure of imaging sensor output carries out pixel separation, generates long exposure image and short exposure figure Picture；

Picture rebuilds module, for carrying out picture reconstruction to the long exposure image and short exposed images respectively, generates both full-pixel Long exposure image and both full-pixel short exposed images；

Wherein, the number of pixels of the long exposure image and the number of pixels of short exposed images are the pixel of the original image The half of number；The number of pixels of the long exposure image of both full-pixel and the number of pixels of the both full-pixel short exposed images It is equal to the number of pixels of the original image.
14. mobile terminal according to claim 9, it is characterised in that the mobile terminal also includes：

Second acquisition module, during gathering preview image in camera, the current sensor for obtaining imaging sensor increases Before benefit value, under unglazed photographical condition, described image sensor is obtained respectively under different sensors gain, the light-sensitive image The dark current value of each dark pixel in plain region；

Corresponding relation determining module, for the dark current value according to each dark pixel under different sensors gain, it is determined that different Corresponding relation between sensor gain and dark current.
15. mobile terminal according to claim 14, it is characterised in that the corresponding relation determining module includes：

3rd dark current determination sub-module, between the dark current value for determining each dark pixel under different sensors gain Difference value is more than the dark current value of predetermined threshold value；

Corresponding relation determination sub-module, for the difference between the dark current value according to each dark pixel under different sensors gain Different value is more than the dark current value of predetermined threshold value, determines the coefficient of relationship of different sensors gain and dark current.
16. mobile terminal according to claim 9, it is characterised in that the mobile terminal also includes：

Module is deducted, for based on pair between the current sensor yield value and default sensor gain and dark current It should be related to, determine in the photosensitive pixel region of described image sensor after the dark current value of each dark pixel, will be described photosensitive The dark current value of each dark pixel deducts from each pixel exported by described image sensor in pixel region；

Image processing module, for carrying out picture signal processing to the picture signal after deduction dark current value, generate targets preview Image.
A kind of 17. mobile terminal, it is characterised in that including：Processor, memory and it is stored on the memory and can be in institute The computer program run on processor is stated, the computer program is realized such as claim 1 to 8 during the computing device Any one of dark current processing method the step of.
18. a kind of computer-readable recording medium, it is characterised in that be stored with computer on the computer-readable recording medium Program, the dark current processing method as any one of claim 1 to 8 is realized when the computer program is executed by processor The step of.