CN104639850A

CN104639850A - Image sensing device and black level control method thereof

Info

Publication number: CN104639850A
Application number: CN201310555203.2A
Authority: CN
Inventors: 徐纬
Original assignee: Novatek Microelectronics Corp
Current assignee: Novatek Microelectronics Corp
Priority date: 2013-11-11
Filing date: 2013-11-11
Publication date: 2015-05-20

Abstract

The invention discloses an image sensing device and a black level control method thereof. The black level control method includes providing a conversion relation between analog gain and offset; according to the conversion relation, converting the analog gain into an analog offset; according to first shading data corresponding to a first part of shading pixels, determining whether or not to regulate the analogue offset; according to data of the second part of the shading pixels, calculating digital data offset.

Description

Image sensering device and black rank control method thereof

Technical field

The invention relates to a kind of image processing techniques, and relate to a kind of image sensering device and black rank (black level) control method thereof especially.

Background technology

General with digital camera (digital still camera; DSC) or other image sensering device photographic images time, even without light source incidence to image sensor, the image shot also likely produces noise because of dark current (dark current).Wherein, " heat energy " is for causing the principal element of dark current." heat energy " causes the electronic behavior of chip to aggravate, and the electronics be heated constantly moves and creates electric current, is formed so-called " dark current ".In order to remove the noise that dark current causes from picture signal, be necessary that carrying out black rank (black level) to image sensering device corrects/control.

Summary of the invention

The invention provides a kind of black rank control method and image sensering device of image sensering device, the dark current information that can effectively utilize the shading region in pel array (optical black area) to provide is carried out accurate black rank and is controlled, thus provides preferably output image data.

The present invention proposes a kind of black rank control method of image sensering device, wherein image sensering device at least comprises a pel array, and pel array comprises multiple shading pixel (optical black pixel) and multiple photosensitive pixel (active pixel).The black rank control method of described image sensering device comprises the following steps.There is provided analog gain to side-play amount transformational relation, and utilize analog gain to side-play amount transformational relation, analog-gain value is converted to analog offset.According to the first shading data corresponding to Part I pixel in shading pixel, determine whether adjust this analog offset.Data again according to the Part II pixel in shading pixel go to calculate numerical data side-play amount.

In one embodiment of this invention, above-mentioned provide the step of analog gain to side-play amount transformational relation to be included in Startup calibration during, by the multiple sense datas using different analog-gain value to read shading pixel respectively, to obtain analog gain to side-play amount transformational relation.

In one embodiment of this invention, multiple sense datas of above-mentioned reading shading pixel, to obtain during the step of analog gain to side-play amount transformational relation be included in Startup calibration, by the sense data using different analog-gain value to read shading pixel respectively, and utilize the sense data of linear regression analysis analog-gain value and shading pixel, use obtain analog gain to side-play amount transfer function as analog gain to side-play amount transformational relation.

In one embodiment of this invention, multiple sense datas of above-mentioned reading shading pixel, to obtain during the step of analog gain to side-play amount transformational relation be included in Startup calibration, by the sense data using different analog-gain value to read shading pixel respectively.And utilize the sense data of linear regression analysis analog-gain value and shading pixel, use and obtain analog gain to side-play amount transfer function.Sense data again by using different side-play amounts to read shading pixel respectively, to calculate conversion proportion.According to analog gain, analog gain is obtained to side-play amount transformational relation to side-play amount transfer function and conversion proportion.

In one embodiment of this invention, above-mentionedly according to analog gain, the step of analog gain to side-play amount transformational relation is obtained to side-play amount transfer function and conversion proportion and comprise the product of calculating simulation gain to side-play amount transfer function and conversion proportion as analog gain to side-play amount transformational relation.

In one embodiment of this invention, above-mentionedly provide the step of analog gain to side-play amount transformational relation to comprise look-up table (lookup table) to be provided, wherein to record analog gain in look-up table to side-play amount transformational relation.

In one embodiment of this invention, above-mentioned step analog-gain value being converted to analog offset comprises according to the photosensitivity (ISO) during preview screen, determine analog-gain value, and utilize analog gain to side-play amount transformational relation, analog-gain value is converted to analog offset.

In one embodiment of this invention, the step whether above-mentioned decision adjusts analog offset comprises: after reading the primary signal of the shading pixel in shading pixel, with analog-gain value gain primary signal, with obtain shading pixel through gain signal, and with analog offset adjustment through gain signal, to obtain the first shading data.Determine whether adjust this analog offset according to this first shading data.

In one embodiment of this invention, the step whether above-mentioned decision adjusts analog offset comprises: the multiple primary signals reading the Part I pixel in shading pixel, and with analog-gain value gain primary signal, to obtain the multiple through gain signal of Part I pixel in shading pixel.Then, with analog offset adjustment through gain signal, to obtain the multiple through adjustment signal of Part I pixel in shading pixel.Afterwards, multiple numerical data will be converted to through adjustment signal respectively, and the mean value of calculating numerical data is as the first shading data.Determine whether adjust this analog offset according to this first shading data.

In one embodiment of this invention, the step that whether above-mentioned decision adjusts analog offset comprises: a. judge the first shading data whether in preset range and analog offset whether be 0; B. when the first shading data is not in preset range or when analog offset is 0, adjustment analog offset, and the shading data corresponding to another part pixel obtained according to the analog offset after adjustment in shading pixel is as the first shading data, and again carry out step a.

In one embodiment of this invention, the step whether above-mentioned decision adjusts analog offset also comprises: when the first shading data is in preset range and when analog offset is not 0, determine the picture element signal adjusting this pel array with analog offset.

In one embodiment of this invention, the step whether above-mentioned decision adjusts analog offset comprises: when the first shading data is in preset range and when analog offset is not 0, read multiple primary signals of the remainder pixel in shading pixel, and with the primary signal of remainder pixel described in analog-gain value gain, to obtain the multiple through gain signal of remainder pixel in shading pixel.Then, with analog offset adjust described remainder pixel through gain signal, to obtain the multiple through adjustment signal of remainder pixel in shading pixel.Afterwards, respectively by the multiple numerical datas being converted to the remainder pixel in shading pixel through adjustment signal of described remainder pixel, and the mean value of calculating numerical data is as numerical data side-play amount.

In one embodiment of this invention, above-mentioned black rank control method also comprises: by using analog offset, reads the view data corresponding to photosensitive pixel respectively, and according to the view data of numerical data side-play amount adjustment corresponding to photosensitive pixel.

In one embodiment of this invention, the above-mentioned analog gain that utilizes is to side-play amount transformational relation, step analog-gain value being converted to analog offset also comprises: judge whether analog-gain value changes, and when analog-gain value changes, re-use analog gain to side-play amount transformational relation, analog-gain value is converted to analog offset.

In one embodiment of this invention, the above-mentioned analog gain that utilizes is to side-play amount transformational relation, step analog-gain value being converted to analog offset also comprises: judge whether read picture number of times reaches number of times threshold value, and when reading picture number of times and reaching number of times threshold value, re-use analog gain to side-play amount transformational relation, analog-gain value is converted to analog offset.

In one embodiment of this invention, above-mentioned analog gain comprises linear equation in two unknowns formula to side-play amount transformational relation, or the multinomial of other power and/or its combination.

The present invention proposes a kind of image sensering device.Described image sensering device comprises at least one pel array, view data reading unit and black rank control unit.Wherein, pel array comprises multiple shading pixel and multiple photosensitive pixel.View data reading unit is coupled to pel array.View data reading unit receives the output of pel array, and according to the view data corresponding to analog-gain value and analog offset output pixel array.Black rank control unit is coupled to view data reading unit.Black rank control unit provides analog gain to side-play amount transformational relation, and utilizes analog gain, to side-play amount transformational relation, analog-gain value is converted to analog offset.According to the first shading data corresponding to Part I pixel in shading pixel, black rank control unit determines whether adjust this analog offset.Afterwards, the data according to the Part II pixel in those shading pixels go to calculate numerical data side-play amount.Wherein, analog offset is exported to view data reading unit by black rank control unit, and according to the view data that numerical data side-play amount adjustment view data reading unit exports.

In one embodiment of this invention, above-mentioned black rank control unit during Startup calibration, by the multiple sense datas using different analog-gain value to read shading pixel respectively, to obtain analog gain to side-play amount transformational relation.

In one embodiment of this invention, above-mentioned black rank control unit is during Startup calibration, by the sense data using different analog-gain value to read shading pixel respectively, and utilize the sense data of linear regression analysis analog-gain value and shading pixel, use obtain analog gain to side-play amount transfer function as analog gain to side-play amount transformational relation.

In one embodiment of this invention, above-mentioned black rank control unit is during Startup calibration, by the sense data using different analog-gain value to read shading pixel respectively, and utilize the sense data of linear regression analysis analog-gain value and shading pixel, use and obtain analog gain to side-play amount transfer function, and the sense data by using different side-play amounts to read shading pixel respectively, to calculate conversion proportion, and according to analog gain, analog gain is obtained to side-play amount transformational relation to side-play amount transfer function and conversion proportion.

In one embodiment of this invention, above-mentioned black rank control unit calculating simulation gain to the product of side-play amount transfer function and conversion proportion as analog gain to side-play amount transformational relation.

In one embodiment of this invention, above-mentioned image sensering device also comprises look-up table, wherein records analog gain in look-up table to side-play amount transformational relation.

In one embodiment of this invention, above-mentioned view data reading unit determines analog-gain value according to photosensitivity during preview one picture, and black rank control unit utilizes analog gain to side-play amount transformational relation, and analog-gain value is converted to analog offset.

In one embodiment of this invention, above-mentioned view data reading unit comprises data-sampling circuit, gain circuitry and side-play amount Circuit tuning.Wherein, the data-sampling circuit being coupled to pel array receives the output of pel array, to obtain primary signal.Gain circuitry is coupled to data-sampling circuit to receive described primary signal, and wherein gain circuitry carrys out gain primary signal according to analog gain, to obtain through gain signal.It is described through gain signal to receive that side-play amount Circuit tuning is coupled to gain circuitry, and wherein side-play amount Circuit tuning adjusts through gain signal according to this analog offset, to export through adjustment signal.

In one embodiment of this invention, above-mentioned data-sampling circuit reads the primary signal of the shading pixel in shading pixel, gain circuitry with the primary signal of this shading pixel of analog-gain value gain with obtain shading pixel through gain signal, and by side-play amount Circuit tuning with analog offset adjust this shading pixel through gain signal, to obtain the first shading data.

In one embodiment of this invention, above-mentioned view data reading unit also comprises analog-digital converter.Analog-digital converter is coupled to side-play amount Circuit tuning.

In one embodiment of this invention, above-mentioned black rank control unit also comprises digital averaging counting circuit, and.Digital averaging counting circuit is coupled to analog-digital converter.Wherein, data-sampling circuit reads multiple primary signals of the Part I pixel in shading pixel.Then, gain circuitry with the primary signal of this Part I pixel of analog-gain value gain to obtain the multiple through gain signal of Part I pixel in shading pixel, and by side-play amount Circuit tuning with analog offset adjust this Part I pixel through gain signal to obtain the multiple through adjustment signal of Part I pixel in shading pixel, afterwards, analog-digital converter will be converted to multiple numerical data through adjustment signal respectively, and digital averaging counting circuit calculates the mean value of numerical data as the first shading data.

In one embodiment of this invention, above-mentioned black rank control unit comprises digital averaging counting circuit, decision circuitry and analog offset Circuit tuning.Wherein, digital averaging counting circuit couples view data reading unit, is converted to the first shading data with the shading data exported by view data reading unit.Decision circuitry couples digital averaging counting circuit to receive the first shading data, wherein decision circuitry judge the first shading data whether in preset range and analog offset whether be 0.Analog offset Circuit tuning couples decision circuitry and this view data reading unit, wherein when decision circuitry judges that the first shading data is not in preset range or when analog offset is 0, analog offset Circuit tuning adjustment analog offset is as analog offset, and view data reading unit obtains the shading data corresponding to another part pixel in shading pixel according to analog offset.

In one embodiment of this invention, above-mentionedly judge that the first shading data is in preset range and when analog offset is not 0 when decision circuitry, analog offset Circuit tuning is determined with the picture element signal of analog offset adjustment pel array.

In one embodiment of this invention, above-mentioned view data reading unit, by using analog offset, reads the view data corresponding to photosensitive pixel respectively, and black rank control unit is according to the view data of numerical data side-play amount adjustment corresponding to photosensitive pixel.

In one embodiment of this invention, above-mentioned image sensering device also comprises reset cell.Reset cell is coupled to black rank control unit, and wherein reset cell judges whether analog-gain value changes.When reset cell judges that analog-gain value changes, reset cell triggers black rank control unit and re-uses analog gain to side-play amount transformational relation, thus analog-gain value is converted to analog offset.

In one embodiment of this invention, above-mentioned image sensering device also comprises reset cell.Reset cell is coupled to view data reading unit and black rank control unit, and wherein reset cell judges whether read picture number of times reaches number of times threshold value.When reset cell judges that reading picture number of times reaches number of times threshold value, reset cell triggers black rank control unit and re-uses analog gain to side-play amount transformational relation, thus analog-gain value is converted to analog offset.

Based on above-mentioned, image sensering device and the black rank control method thereof of the embodiment of the present invention obtain analog offset by analog gain to side-play amount transformational relation, and utilize shading data to determine whether adjust analog offset and calculate numerical data side-play amount, and effectively can utilize shading region, thus realize accurate black rank control, and then provide preferably output image data.

For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate institute's accompanying drawings to be described in detail below.

Accompanying drawing explanation

Fig. 1 is the circuit box schematic diagram of the image sensering device illustrated according to one embodiment of the invention.

Fig. 2 A to 2E be according to one embodiment of the invention illustrate sampling from the data voltage distribution schematic diagram of pel array.

Fig. 3 is the schematic flow sheet of the black rank control method of the image sensering device illustrated according to one embodiment of the invention.

Fig. 4 is that the analog gain that illustrates according to one embodiment of the invention is to the example of side-play amount transformational relation.

Fig. 5 is the circuit box schematic diagram of the image sensering device illustrated according to one embodiment of the invention.

Fig. 6 is the schematic flow sheet of the black rank control method of the image sensering device illustrated according to one embodiment of the invention.

Fig. 7 is the circuit box schematic diagram of the view data reading unit illustrated according to one embodiment of the invention.

Fig. 8 is the circuit box schematic diagram of the image sensering device illustrated according to one embodiment of the invention.

Fig. 9 is the schematic flow sheet of the black rank control method of the image sensering device illustrated according to one embodiment of the invention.

Figure 10 is the schematic flow sheet of the black rank control method of the image sensering device illustrated according to one embodiment of the invention.

Figure 11 A, Figure 11 B are the schematic flow sheets of the black rank control method of the image sensering device illustrated according to one embodiment of the invention.

Figure 12 is the circuit box schematic diagram of the image sensering device illustrated according to one embodiment of the invention.

Figure 13 A, Figure 13 B are the schematic flow sheets of the black rank control method of the image sensering device illustrated according to one embodiment of the invention.

Figure 14 is the circuit box schematic diagram of the image sensering device illustrated according to one embodiment of the invention.

[label declaration]

100,500,800,1200,1400: image sensering device

110,510,810,1210,1410: pel array

111,511,811,1211,1411: shading pixel

112,512,812,1212,1412: photosensitive pixel

120,520,720,820,1220,1420: view data reading unit

130,530,830,1230,1430: black rank control unit

210: shading data voltage 220: sensitization data voltage

410: analog gain is to side-play amount transformational relation 521,721,821: data-sampling circuit

522,722,822: gain circuitry 523,723,823: side-play amount Circuit tuning

723a, 823a: the first arithmetic element 723b, 823b: digital analog converter

824: analog-digital converter 831: digital averaging counting circuit

832: decision circuitry 833: analog offset Circuit tuning

840,1240: the second arithmetic elements 1250: reset cell

1460: look-up table

S310 ~ S340, S610 ~ S640, S910 ~ S940, S1010 ~ S1040, S1036a ~ S1036c, S1110 ~ S1160, S1136a ~ S1136c, S1310 ~ S1374, S1336a ~ S1336c: step

A_OFFSET: analog offset ACT_DATA: view data

D_OFFSET: numerical data side-play amount FG: flag

G: analog gain OB_DATA: shading data

TH: higher limit

Embodiment

Use in specification of the present invention in full (comprising claim) " coupling " one word can refer to any connection means directly or indirectly.For example, if describe first device in literary composition to be coupled to the second device, then should be construed as this first device and can be directly connected in this second device, or this first device can be connected to this second device indirectly by other device or certain connection means.In addition, all may part, in graphic and execution mode, use the element/component/step of identical label to represent identical or similar portions.Use identical label in different embodiment or use the element/component/step of identical term can cross-referenced related description.

First the black rank control method of the image sensering device of the embodiment of the present invention utilizes the transformational relation of analog gain to side-play amount to obtain analog offset, and it is whole to carry out preliminary black contrast according to this analog offset to shading data.Afterwards, then via feedback system, and according to through adjustment shading data analog offset is finely tuned.By this, comparatively accurate black rank can be realized and control, and obtain preferably output image data.

The black rank control method of the image sensering device that the embodiment of the present invention proposes will be described in detail below.It is the circuit box schematic diagram of the image sensering device illustrated according to one embodiment of the invention please also refer to Fig. 1, Fig. 1.Image sensering device 100 is such as CMOS (Complementary Metal Oxide Semiconductor) (complementary metal oxide semiconductor; CMOS) sensor, charge coupled device (charge coupled device; CCD) sensor, or the image sensor that the array of other utilization independent pixel sensor is formed, the kind of the present invention's not limited images sensing apparatus.Image sensering device 100 comprises pel array 110, view data reading unit 120 and black rank control unit 130.Wherein, pel array 110 comprises multiple shading pixel (Optical Black Pixel) 111 and multiple photosensitive pixel (Active Pixel) 112.Shading pixel 111 and photosensitive pixel 112 can be implemented by CMOS (Complementary Metal Oxide Semiconductor), charge coupled device or other technology.

Photosensitive pixel 112 may comprise such as red (R), green (G) and blue (B) color pixel, in order to the light signal of reception/sensing image.As for shading pixel 111 by structure same or analogous with photosensitive pixel, and light shield layer (such as metal or other barrier layer) is utilized to cover shading pixel 111 and make it cannot receive/sensor light signal.Because do not have light to irradiate shading pixel 111, therefore the output signal of shading pixel ideally 111 should be the signal level representing " dull thread ".But, because " heat energy " or other factors cause the electronic behavior of pel array 110 to aggravate.The electronics be heated constantly moves and creates electric current, is formed so-called " dark current ".Therefore, the light data that photosensitive pixel 112 senses comprise actual image data and the noise from dark current.The shading pixel 111 not having light to irradiate can be used for detecting dark current.The present embodiment does not limit the layout type of shading pixel 111 and photosensitive pixel 112.Such as, in certain embodiments, shading pixel 111 can via the mode of row (row) and/or row (column) around/be configured at the border of pel array 110, or also can be positioned at other position of pel array 110.

Fig. 2 A to Fig. 2 E be according to one embodiment of the invention illustrate sampling from the data voltage distribution schematic diagram of pel array, wherein the longitudinal axis represents data voltage, and transverse axis represents location of pixels.Please refer to Fig. 1 and Fig. 2 A to Fig. 2 E, view data reading unit 120 is coupled to pel array 110.View data reading unit 120 receives the output of pel array 110, to obtain primary signal (such as shown in Fig. 2 A).View data reading unit 120 can export view data corresponding to this pel array 110 according to analog-gain value G and analog offset A_OFFSET.Such as, in certain embodiments, view data reading unit 120 can carry out gain according to analog-gain value G to the output signal of pel array 110, to obtain through gain signal (such as shown in Fig. 2 B).View data reading unit 120 can adjust through gain signal according to analog offset A_OFFSET, to obtain through adjustment signal (such as shown in Fig. 2 C).Arrow in Fig. 2 C and presentation video data-reading unit 120 to the adjustment carrying out signal level through gain signal, and can obtain through adjustment signal.

Above-mentioned is analogue data form through adjusting signal.The view data reading unit 120 of the present embodiment also can be converted to the view data (such as shown in Fig. 2 D) of digital form, so that late-class circuit (not illustrating) carries out image real time transfer through adjusting signal.Black rank control unit 130 is coupled to view data reading unit 120.Black rank control unit 130 exports analog offset A_OFFSET to view data reading unit 120, goes to carry out skew adjustment to described through gain signal to control image data-reading unit 120.The view data that black rank control unit 130 can also export according to view data reading unit 120 and calculate numerical data side-play amount D_OFFSET.According to numerical data side-play amount D_OFFSET, black rank control unit 130 can also adjust the view data ACT_DATA corresponding to photosensitive pixel 112 that view data reading unit 120 exports.

Please refer to Fig. 2 E, it depicts the sampling example that shading pixel 111 distributes with the data voltage of photosensitive pixel 112 in pel array 110.From aforementioned, the primary signal of shading pixel 111 comprises the noise from dark current, and the primary signal of photosensitive pixel 112 then comprises actual image data and the noise from dark current.Black rank control unit 130 by adjustment analog offset A_OFFSET and the view data of numerical data side-play amount D_OFFSET process photosensitive pixel 112, to remove the noise contribution from dark current.Specifically, as shown in Figure 2 E, sample and comprise noise from dark current from the shading data voltage 210 of shading pixel 111, and sampling includes noise (horizontal dotted line in Fig. 2 E) from dark current and real image data voltage from the sensitization data voltage 220 (solid line in Fig. 2 E) of photosensitive pixel 112.If it is noted that do not adjust described through gain signal in analog domain (analog domain), then when data voltage is converted to numerical data, due to analog-digital converter (Analog to Digital Converter; ADC) restricted to its voltage conversion range, therefore the dark current noise in view data may or make the output of the numeral of view data reading unit 120 occur saturated, causes parts of images loss of information.

Black rank control unit 130 controls image data-reading unit 120 by adjustment analog offset A_OFFSET, make view data reading unit 120 in analog domain, first remove a part (such as reducing the described DC level through gain signal) for described dark current noise in gain signal, saturated to avoid the numeral of view data reading unit 120 to export generation.Via digital processing, it is such as the technology of subtracter, black rank control unit 130 carries out computing both the numeral of numerical data side-play amount D_OFFSET and view data reading unit 120 can being exported, with the other parts of removing dark current noise in numeric field (digital domain).That is, image sensering device 100 can use two benches (analog domain and numeric field) to carry out the correction of black rank.

Fig. 3 is the flow chart of the black rank control method that image sensering device is described according to one embodiment of the invention.The method of the present embodiment is applicable to above-mentioned image sensering device 100, below namely to arrange in pairs or groups each item of image sensering device 100 in Fig. 1, and according to Fig. 3 the detailed process of the present embodiment method and image sensering device 100 and black rank control unit 130 thereof be described make flowing mode in detail.

Please refer to Fig. 1 and Fig. 3, in step S310, black rank control unit 130 can provide " analog gain is to side-play amount transformational relation ".In certain embodiments, analog gain can be linear equation in two unknowns formula to side-play amount transformational relation, and also can be multinomial and/or its combination of other power, the present invention limit this.Described analog gain to side-play amount transformational relation can in advance in be built in black rank control unit 130.

In further embodiments, image sensering device 100 during Startup calibration, by the multiple sense datas using different analog-gain value G to read shading pixel 111 respectively, can be used and obtain analog gain to side-play amount transformational relation.Wherein, black rank control unit 130 can obtain an analog gain and be used as described analog gain to side-play amount transformational relation to side-play amount transfer function during Startup calibration, also can be according to an analog gain to side-play amount transfer function and a conversion proportion to obtain described analog gain to side-play amount transformational relation.For above-mentioned situation, followingly illustrate during Startup calibration for an embodiment, black rank control unit 130 obtains the execution mode of analog gain to side-play amount transformational relation.

In one embodiment, during Startup calibration, image sensering device 100 reads the sense data of those the shading pixels corresponding with each analog-gain value G respectively by view data reading unit 120, and utilize the mode analysis mode yield value of linear regression and the sense data of shading pixel by black rank control unit 130, use and obtain analog gain to side-play amount transfer function, thus as analog gain to side-play amount transformational relation.Such as, Fig. 4 be the analog gain that illustrates according to one embodiment of the invention to the example of side-play amount transformational relation, wherein the longitudinal axis represents side-play amount (shading pixel through gain data), and transverse axis represents analog-gain value G.During Startup calibration, multiple different analog-gain value G can be supplied to view data reading unit 120 by image sensering device 100, and read by view data reading unit 120 pairs of shading pixels, to obtain the multiple sense datas (in such as Fig. 4 small circle those shown) as corresponded to each analog-gain value G in Fig. 4.Each sense data corresponding to different analog-gain value G can be the reading result from identical shading pixel, also can be the average of the sense data corresponding to several shading pixel.Afterwards, then conclude by linear regression analysis mode each sense data that Fig. 4 illustrates, thus obtain analog gain to side-play amount transformational relation 410.Described analog gain is such as linear equation in two unknowns formula to side-play amount transformational relation 410.For example, described analog gain can be following equation 1 to side-play amount transformational relation 410, and wherein A_OFFSET represents side-play amount, and a represents slope, and G represents analog gain, and b represents intercept.Black rank control unit 130 can conclude analog gain described in Fig. 4 to the slope a of side-play amount transformational relation 410 and intercept b.Therefore, during Startup calibration terminate after, black rank control unit 130 can use analog gain to side-play amount transformational relation 410 by analog gain G be converted to side-play amount A_OFFSET.

A_OFFSET=a*G+b equation 1

In other embodiments, when analog gain to side-play amount transformational relation be the multinomial of other power and/or its combination time, black rank control unit 130 also may correspond to and uses polynomial regression or other statistical homing method to obtain analog gain to side-play amount transformational relation.

It is worth mentioning that, due to the impact of processing procedure factor or environmental change, each shading pixel in pel array 110 may have difference to each other.And by the mode of linear regression, the variability between each shading pixel can be considered, such as, above-mentioned analog gain is to the variation information of the intercept b parameter in side-play amount transformational relation namely between implicit each shading pixel.

Please refer to Fig. 1 and Fig. 3, in step S320, black rank control unit 130 utilizes analog gain described in step S310 to side-play amount transformational relation, and analog-gain value G is converted to analog offset A_OFFSET.In the present embodiment, image sensering device 100 according to the photosensitivity (ISO) during preview one picture, and can determine analog-gain value G.In other embodiments, analog-gain value G also can be the built-in preset value of image sensering device 100, set point when analog-gain value G also can be previous shutdown, or analog-gain value G also can be the parameter value manually selected via user and determine.The deciding means of the present embodiment to analog-gain value G does not limit.

After analog-gain value G is determined, black rank control unit 130 can utilize described analog gain to side-play amount transformational relation, and analog-gain value G is converted to analog offset A_OFFSET.At this, black rank control unit 130 can by the analog offset A_OFFSET that obtains through conversion stored in corresponding buffer.When view data reading unit 120 pairs of view data carry out side-play amount adjustment, analog offset A_OFFSET can export to view data reading unit 120 from the buffer of black rank control unit 130.

In step S330, black rank control unit 130, according to the first shading data corresponding to the Part I pixel (one or more shading pixel) in shading pixel 111, determines whether analog offset A_OFFSET described in set-up procedure S320.In certain embodiments, image sensering device 100 can read the sense data of single shading pixel in shading pixel 111 as described first shading data by view data reading unit 120.And if consider the variation that may exist between multiple shading pixel 111 and cause additional noise, in further embodiments, image sensering device 100 also can read the sense data of the multiple shading pixels in shading pixel 111 by view data reading unit 120, then obtains the first corresponding shading data via average mode.After black rank control unit 130 obtains described first shading data, black rank control unit 130 can check described first shading data and determine whether adjust analog offset A_OFFSET.Such as, when the gap of described first shading data and desired value (such as 0 or other reference value) is greater than a certain threshold value (such as 10 or other reference value), black rank control unit 130 can increase analog offset A_OFFSET, to reducing described first shading data.When the gap of described first shading data and described desired value is less than described threshold value, black rank control unit 130 can maintain current analog offset A_OFFSET.

In step S340, black rank control unit 130 according to the data of the Part II pixel (one or more shading pixel) in shading pixel 111, can calculate numerical data side-play amount D_OFFSET.Such as, in the present embodiment, view data reading unit 120 can export the sense data of all the other the shading pixels in shading pixel 111 to black rank control unit 130 according to analog offset A_OFFSET determined in above-mentioned steps S330, and black rank control unit 130 can calculate numerical data side-play amount D_OFFSET according to the sense data of all the other shading pixels described.The sense data of said shading pixel can be from one or more shading pixel.Such as, black rank control unit 130 can be in addition average by the sense data of shading pixel multiple in shading pixel 111, and using this mean value as numerical data side-play amount D_OFFSET.Wherein, read multiple shading pixel and can exempt the difference stemmed between each shading pixel and the noise caused to obtain corresponding numerical data side-play amount.Black rank control unit 130 can according to numerical data side-play amount D_OFFSET correction image data ACT_DATA.

In sum, the black rank control method that proposes of the present embodiment and image sensering device 100 can divide the two-stage to carry out the correction of black rank.In analog domain, the analog offset A_OFFSET that view data reading unit 120 can provide according to black rank control unit 130 carries out rough black rank and corrects, and to avoid view data ACT_DATA, saturated phenomenon occurs.In the digital domain, black rank control unit 130 can carry out careful black rank correction by adjustment numerical data side-play amount D_OFFSET to view data ACT_DATA.Wherein, black rank control unit 130 uses the sense data of the part shading pixel in shading pixel 111 just can determine analog offset A_OFFSET and numerical data side-play amount D_OFFSET.Therefore, the black rank control method that the present embodiment proposes and image sensering device 100 effectively can utilize the shading pixel 111 of limited area, and carry out accurate black rank correction and control.

In any case implementation of the present invention should not be limited to above-described embodiment.Such as, Fig. 5 is the circuit box schematic diagram of the image sensering device illustrated according to another embodiment of the present invention.Image sensering device 500 shown in Fig. 5 comprises pel array 510, view data reading unit 520 and black rank control unit 530.Pel array 510 comprises shading pixel 511 and photosensitive pixel 512.Image sensering device 500 shown in Fig. 5, pel array 510, shading pixel 511, photosensitive pixel 512, view data reading unit 520 can analogize it with reference to the related description of image sensering device 100 shown in Fig. 1, pel array 110, shading pixel 111, photosensitive pixel 112, view data reading unit 120 and black rank control unit 130 with black rank control unit 530.From embodiment illustrated in fig. 1 different be in, the reading unit of view data shown in Fig. 5 520 comprises data-sampling circuit 521, gain circuitry 522 and side-play amount Circuit tuning 523.

Please refer to Fig. 5, data-sampling circuit 521 is coupled to pel array 510, and receives the output of pel array 510, to obtain a primary signal (such as shown in Fig. 2 A).In certain embodiments, data-sampling circuit 521 sample from pel array 510 and charge data is converted to analog voltage export and as primary signal.In certain embodiments, pel array 510 can directly can export analog voltage to gain circuitry 522 in conjunction with data-sampling circuit 521.Application the present embodiment person should configure corresponding data-sampling circuit 521 according to the characteristic of its design requirement and pel array 510, obtains the primary signal corresponding to being stored in pel array 510.Gain circuitry 522 is coupled to data-sampling circuit 521 to receive described primary signal, and carrys out gain primary signal according to analog-gain value G, to obtain through gain signal (such as shown in Fig. 2 B).Gain circuitry 522 is such as programmable gain amplifier (programmable gain amplifier), or the amplifier of other kind.The present embodiment does not limit the component kind and circuit framework that realize gain circuitry 522.

It is described through gain signal to receive that side-play amount Circuit tuning 523 is coupled to gain circuitry 522.Side-play amount Circuit tuning 523 can be described through gain signal according to analog offset A_OFFSET adjustment at analog domain, to obtain through adjustment signal (such as shown in Fig. 2 C).Side-play amount Circuit tuning 523 can also by the described view data ACT_DATA (such as shown in Fig. 2 D) being converted to numeral through adjustment signal.Therefore, the analog offset A_OFFSET that side-play amount Circuit tuning 523 can provide according to black rank control unit 530 in analog domain carries out rough black rank and corrects, and to avoid view data ACT_DATA, saturated phenomenon occurs.

Side-play amount Circuit tuning 523 can obtain the shading data of shading pixel 511 via data-sampling circuit 521 and gain circuitry 522.When the gap of shading data and desired value (such as 0 or other reference value) is greater than a certain threshold value (such as 15 or other reference value), black rank control unit 530 can increase analog offset A_OFFSET, to reducing described shading data.When the gap of described shading data and described desired value is less than described threshold value, black rank control unit 530 can keep current analog offset A_OFFSET.When analog offset A_OFFSET remains unchanged by black rank control unit 530, the view data ACT_DATA that view data reading unit 520 can export corresponding to photosensitive pixel 512 according to analog gain G and analog offset A_OFFSET.

When black rank control unit 530 has determined analog offset A_OFFSET, side-play amount Circuit tuning 523 can obtain the shading data of the part shading pixel (one or more shading pixel) of shading pixel 511 via data-sampling circuit 521 and gain circuitry 522, and this shading data is supplied to black rank control unit 530.Black rank control unit 530 can calculate numerical data side-play amount D_OFFSET according to the shading data of the part shading pixel of shading pixel 511.Such as, black rank control unit 530 can be in addition average by the shading data of shading pixel multiple in shading pixel 511, and using this mean value as numerical data side-play amount D_OFFSET.Via digital processing circuit (being such as subtracter), view data ACT_DATA can be deducted numerical data side-play amount D_OFFSET and correct to the black rank of carrying out numeric field by image sensering device 500.Therefore, black rank control unit 530 can carry out careful black rank correction by adjustment numerical data side-play amount D_OFFSET to view data ACT_DATA in the digital domain.

Fig. 6 is the schematic flow sheet of the black rank control method of the image sensering device illustrated according to another embodiment of the present invention.Step S610 shown in Fig. 6, step S620, step S630 and step S640 can analogize it with reference to the related description of step S310 shown in Fig. 3, step S320, step S330 and step S340.Please refer to Fig. 5 and Fig. 6, in step S610, black rank control unit 530 provides analog gain to side-play amount transformational relation.Then, in step S620, black rank control unit 530 utilizes described analog gain to side-play amount transformational relation, and analog-gain value G is converted to analog offset A_OFFSET.

Sub-step S631 ~ S634 is comprised at the step S630 of the present embodiment.In step S631, the primary signal of part shading pixel in the shading pixel 511 of the data-sampling circuit 521 read pixel array 510 of view data reading unit 520.Then, in step S832, the primary signal that gain circuitry 522 exports with data-sampling circuit 521 described in analog-gain value G gain, with obtain the part shading pixel of described shading pixel 511 through gain signal.Afterwards, in step S633, more described through gain signal with analog offset A_OFFSET adjustment via side-play amount Circuit tuning 523, by this, the first shading data OB_DATA can be obtained.

Black rank control unit 530 will determine whether adjust analog offset A_OFFSET (step S634) according to the first obtained shading data OB_DATA.When black rank control unit 530 has determined analog offset A_OFFSET, black rank control unit 530 can calculate numerical data side-play amount D_OFFSET (step S640) according to the data of the Part II pixel in shading pixel 511.

Fig. 7 is the circuit box schematic diagram of the view data reading unit illustrated according to further embodiment of this invention.The reading unit of view data shown in Fig. 7 720 comprises data-sampling circuit 721, gain circuitry 722 and side-play amount Circuit tuning 723.The reading unit of view data shown in Fig. 7 720, data-sampling circuit 721, gain circuitry 722 and side-play amount Circuit tuning 723 can analogize it with reference to the related description of image sensering device 100 shown in Fig. 1 and view data reading unit 120, and/or are related description with reference to image sensering device 500, view data reading unit 520, data-sampling circuit 521, gain circuitry 522 and side-play amount Circuit tuning 523 shown in Fig. 5 and analogize it.From embodiment illustrated in fig. 5 different be in, the side-play amount Circuit tuning 723 in the reading unit of view data shown in Fig. 7 720 can comprise the first arithmetic element 723a and digital analog converter (Digital to Analog Converter; DAC) 723b.

The input of digital analog converter 723b couples black rank control unit, to receive the analog offset A_OFFSET from black rank control unit.Analog offset A_OFFSET can be converted to analogue data form from digital data form by digital analog converter 723b.The analog offset of analog form is sent to the first arithmetic element 723a by digital analog converter 723b.First arithmetic element 723a couples gain circuitry 722 and digital analog converter 723b.First arithmetic element 723a receive from gain circuitry 722 export through gain signal, and to receive from the analog offset A_OFFSET of the analog form of digital analog converter 723b.First arithmetic element 723a can carry out computing to described through gain signal and analog offset A_OFFSET and obtain adjustment signal at analog domain, and exports to next stage circuit by described through adjustment signal.Such as, the first arithmetic element 723a can deduct analog offset A_OFFSET by described through gain signal, and will subtract each other result as described through adjustment signal.

In addition, in further embodiments, view data reading unit then reads multiple primary signals of the Part I pixel in shading pixel by data-sampling circuit, and multiple numerical datas corresponding for these primary signals are got its average after, use acquisition first shading data.Such as, Fig. 8 is according to the present invention's more circuit box schematic diagram of image sensering device of illustrating of an embodiment.In the present embodiment, image sensering device 800 shown in Fig. 8 comprises pel array 810, view data reading unit 820, black rank control unit 830 and the second arithmetic element 840.Pel array 810 comprises shading pixel 811 and photosensitive pixel 812.Image sensering device 800 shown in Fig. 8, pel array 810, shading pixel 811, photosensitive pixel 812, view data reading unit 820 and black rank control unit 830 can with reference to image sensering devices 100 shown in Fig. 1, pel array 110, shading pixel 111, photosensitive pixel 112, view data reading unit 120 and the related description of black rank control unit 130 and analogize it, also can with reference to image sensering device 500 shown in Fig. 5, pel array 510, shading pixel 511, photosensitive pixel 512, view data reading unit 520 and the related description of black rank control unit 530 and analogize it.

The reading unit of view data shown in Fig. 8 820 comprises data-sampling circuit 821, gain circuitry 822, side-play amount Circuit tuning 823 and analog-digital converter (Analog to Digital Converter; ADC) 824.Data-sampling circuit 821 shown in Fig. 8, gain circuitry 822 can analogize it with reference to the related description of data-sampling circuit 521 shown in Fig. 5, gain circuitry 522 and side-play amount Circuit tuning 523 with side-play amount Circuit tuning 823, also can analogize it with reference to the related description of data-sampling circuit 721 shown in Fig. 7, gain circuitry 722 and side-play amount Circuit tuning 723.The Circuit tuning of side-play amount shown in Fig. 8 823 comprises the first arithmetic element 823a and digital analog converter 823b.First arithmetic element 823a shown in Fig. 8 and digital analog converter 823b can analogize it with reference to the related description of the first arithmetic element 723a and digital analog converter 723b shown in Fig. 7.From Fig. 5 and embodiment illustrated in fig. 7 different be in, the control unit of black rank shown in Fig. 8 830 comprises digital averaging counting circuit 831, decision circuitry 832 and analog offset Circuit tuning 833.

Please refer to Fig. 8, the input of analog-digital converter 824 is coupled to the output of the first arithmetic element 823a of side-play amount Circuit tuning 823.What the first arithmetic element 823a can export by analog-digital converter 824 is converted to corresponding numerical data through adjustment signal.The input of digital averaging counting circuit 831 is coupled to analog-digital converter 824.Digital averaging counting circuit 831 can the mean value of many stroke numerals data that exports of calculating simulation digital quantizer 824 as the first shading data OB_DATA, or the mean value of other many stroke numerals data that calculating simulation digital quantizer 824 exports is as numerical data side-play amount D_OFFSET.

Fig. 9 is the schematic flow sheet of the black rank control method of the image sensering device illustrated according to further embodiment of this invention.Step S910 shown in Fig. 9, step S920, step S930 and step S940 can analogize it with reference to the related description of step S310 shown in Fig. 3, step S320, step S330 and step S340, also can analogize it with reference to the related description of step S610 shown in Fig. 6, step S620, step S630 and step S640.Please refer to Fig. 8 and Fig. 9, in step S910, black rank control unit 830 provides analog gain to side-play amount transformational relation.Then, in step S920, black rank control unit 830 utilizes the analog gain of step S910 to side-play amount transformational relation, and analog-gain value G is converted to analog offset A_OFFSET.Sub-step S931 ~ S936 is comprised at the step S930 of the present embodiment.

In step S931, the data-sampling circuit 821 of view data reading unit 820 reads multiple primary signals of the Part I pixel in shading pixel 811.Afterwards, in step S932, the primary signal that gain circuitry 822 exports with data-sampling circuit 821 described in analog-gain value G gain, to obtain the multiple through gain signal of Part I pixel in shading pixel 811.On the other hand, the analog offset A_OFFSET of digital form can be converted to the analog offset A_OFFSET of analog form by digital analog converter 823b.In step S933, first arithmetic element 823a of side-play amount Circuit tuning 823 analog offset A_OFFSET in an analogue form adjust that gain circuitry 822 provides these through gain signal, use the multiple through adjustment signal of the Part I pixel obtained in shading pixel 811.Afterwards, in step S934, analog-digital converter 824 respectively the first arithmetic element 823a is provided these be converted to multiple numerical data through adjustment signal, and export these numerical datas to digital averaging counting circuit 831.And in step S935, the mean value of these numerical datas provided by digital averaging counting circuit 831 calculating simulation digital quantizer 824, uses the first shading data OB_DATA as the Part I pixel in shading pixel 811.

Such as, the primary signal gain G of the shading pixel of 8 in shading pixel 811 doubly can be obtained 8 through gain signal by gain circuitry 822.First arithmetic element 823a these 8 of gain circuitry 822 can be provided deduct after analog offset A_OFFSET through gain signal and obtain 8 through adjustment signal.Analog-digital converter 824 these 8 of the first arithmetic element 923a can be provided are converted to 8 stroke numeral data through adjustment signal.Digital averaging counting circuit 831 can the mean value of these 8 stroke numeral data that provides of calculating simulation digital quantizer 824, as the first shading data OB_DATA of 8 shading pixels described in shading pixel 811.

Afterwards, in step S936, the decision circuitry 832 of black rank control unit 830 will determine according to the first obtained shading data OB_DATA whether control simulation side-play amount Circuit tuning 833 goes to adjust analog offset A_OFFSET.Such as, when the gap of described first shading data OB_DATA and desired value (such as 0 or other reference value) is greater than a certain threshold value (such as 20 or other reference value), decision circuitry 832 can be ordered about analog offset Circuit tuning 833 and be gone to adjust and increase analog offset A_OFFSET.Because analog offset A_OFFSET is adjusted increasing, so the data exported at upper once view data reading unit 820 can be lowered.When the gap of described first shading data OB_DATA and described desired value is less than described threshold value, decision circuitry 832 can be ordered about analog offset Circuit tuning 833 and be gone to keep current analog offset A_OFFSET.So far, black rank control unit 830 completes and corrects on the rough black rank of analog domain.

When the decision circuitry 832 of black rank control unit 830 has determined analog offset A_OFFSET, the digital averaging counting circuit 831 of black rank control unit 830 can carry out step S940.In step S940, gain circuitry 822 the primary signal gain G of the Part II pixel in shading pixel 811 doubly can be obtained the described Part II pixel in shading pixel 811 through gain signal.Such as, described Part II pixel can be other 8 (or other quantity) shading pixels, or is not yet read other shading pixel in shading pixel 811.This Part II pixel that gain circuitry 822 can provide by the first arithmetic element 823a through gain signal deduct to obtain after analog offset A_OFFSET this Part II pixel through adjustment signal.The data being converted to this Part II pixel through adjustment signal of this Part II pixel that the first arithmetic element 823a can provide by analog-digital converter 824.Digital averaging counting circuit 831 can calculate numerical data side-play amount D_OFFSET according to the data of this Part II pixel in shading pixel 811 in step S940.Such as, digital averaging counting circuit 831 can the mean value of the numerical data of this Part II pixel that provides of calculating simulation digital quantizer 824, as numerical data side-play amount D_OFFSET.

After black rank control unit 830 determines analog offset A_OFFSET and numerical data side-play amount D_OFFSET, view data reading unit 820 can read the raw image data of photosensitive pixel 812, and adjusts the raw image data of photosensitive pixel 812 according to analog gain G and analog offset A_OFFSET and obtain view data ACT_DATA.This numerical data side-play amount D_OFFSET that second arithmetic element 840 can provide according to digital averaging counting circuit 831 and adjust the view data ACT_DATA that view data reading unit 820 provides.Such as, view data ACT_DATA can be deducted numerical data side-play amount D_OFFSET and obtain the view data corrected through black rank by the second arithmetic element 840.So far, black rank control unit 830 can carry out careful black rank correction by adjustment numerical data side-play amount D_OFFSET to view data ACT_DATA in the digital domain.

From the above, the analog offset A_OFFSET of digital form can be converted to the analog offset A_OFFSET of analog form by digital analog converter 823b, carries out rough black rank correct for the first arithmetic element 823a at analog domain.But if consider actual state, digital analog converter 823b may have error.Therefore, black rank control unit 830 in step S910 except analog gain shown in aforesaid equation 1 can be provided except side-play amount transformational relation, different analog offset A_OFFSET can also be provided during Startup calibration to digital analog converter 823b, to calculate the conversion proportion DAC_ratio of digital analog converter 823b.View data reading unit 820 can read the shading data of different pixels in shading pixel 811 with different analog offset A_OFFSET, and by analog-digital converter 824, these shading data of shading pixel 811 is supplied to black rank control unit 830.Such as, when the numerical data of analog offset A_OFFSET is set as In0 in step S910 by black rank control unit 830, it is Out0 that analog-digital converter 824 exports corresponding digital shading data.When the numerical data of analog offset A_OFFSET is set as In1 by black rank control unit 830, it is Out1 that analog-digital converter 824 exports corresponding digital shading data.Therefore, black rank control unit 830 can calculate the conversion proportion DAC_ratio of digital analog converter 823b according to following equation 2 in step S910.

DAC_ratio=(In0-IN1)/(Out0-Out1) equation 2

Black rank control unit 830 according to analog gain shown in aforesaid equation 1 to conversion proportion DAC_ratio shown in side-play amount transfer function and equation 2, thus can dope the initial value of analog offset A_OFFSET in step S920.Such as, black rank control unit 830 can calculate following equation 3 in step S920.Wherein, pixel_V represents the primary signal/data of certain pixel in pel array 810, and G represents the analog gain when reading pixel_Voltage, and a represents the slope of equation 1, and b represents the intercept of equation 1.

A_OFFSET=(pixel_V*G)-[(a*G+b) * DAC_ratio] equation 3

Figure 10 is according to the present invention's more schematic flow sheet of the black rank control method of image sensering device of illustrating of an embodiment.Step S1010 shown in Figure 10, S1020, S1030, S1031, S1032, S1033, S1034, S1035, S1036 and S1040 can analogize it with reference to the related description of step S910 shown in Fig. 9, S920, S930, S931, S932, S933, S934, S935, S936 and step S940.In the present embodiment, step S1036 shown in Figure 10 comprises sub-step S1036a ~ S1036c.

Please refer to Fig. 8 and Figure 10, in step S1036a, decision circuitry 832 judges the first shading data OB_DATA whether in a preset range, and whether analog offset A_OFFSET is 0.This preset range can determine it according to design requirement, such as, be set as between 0 to higher limit TH by described preset range, and wherein higher limit TH is real number.Described preset range can determine according to the input voltage permissible range of analog-digital converter 824.

When the first shading data OB_DATA is not in described preset range, or when analog offset A_OFFSET is 0, decision circuitry 832 can carry out step S1036b.In step S1036b, decision circuitry 832 can be gone to adjust analog offset A_OFFSET by control simulation side-play amount Circuit tuning 833, such as, increase analog offset A_OFFSET.Specifically, in one embodiment, analog offset Circuit tuning 833 adjusts the mode of analog offset A_OFFSET can be finely tune analog offset A_OFFSET according to a ratio (5% of such as analog offset A_OFFSET).Or, in another embodiment, analog offset Circuit tuning 833 also can be a use definite value/step value to adjust analog offset A_OFFSET, do not limit the adjustment mode of analog offset A_OFFSET at this.In step S1036b, shading data OB_DATA corresponding to another part pixel in shading pixel 811 can be exported to decision circuitry 832 according to the analog offset A_OFFSET after adjusting with digital averaging counting circuit 831 by view data reading unit 820, and again carries out above-mentioned determining step S1036a by decision circuitry 832.

When the first shading data OB_DATA falls within described preset range, and when analog offset A_OFFSET is not 0, decision circuitry 832 can carry out step S1036c.In step S1036c, current analog offset A_OFFSET can remain unchanged by control simulation side-play amount Circuit tuning 833 by decision circuitry 832.So far, analog offset Circuit tuning 833 can be determined with this analog offset A_OFFSET to adjust the picture element signal of photosensitive pixel 812 in pel array 810.By this, image sensering device 800 can carry out comparatively accurate black rank control according to this analog offset A_OFFSET in analog domain.

Such as, view data reading unit 820 can read the primary signal of 32 shading pixels in shading pixel 811, and adjusts the primary signal of these 32 shading pixels according to analog gain G and analog offset A_OFFSET and obtain the shading data of these 32 shading pixels.Digital averaging counting circuit 831 calculates the mean value of the shading data of these 32 shading pixels and obtains the first shading data OB_DATA.Suppose that the first shading data OB_DATA now corresponding to these 32 shading pixels is 11 at this, and the higher limit TH of above-mentioned preset range is set to 10.Therefore, in step S1036a, decision circuitry 832 judges that the first shading data OB_DATA is not in described preset range, so that step S1036b is performed.In step S1036b, analog offset Circuit tuning 833 can increase analog offset A_OFFSET, such as, increase 5% of analog offset A_OFFSET.View data reading unit 820 can adjust the primary signal of other 32 the shading pixels in shading pixel 811 according to analog gain G and analog offset A_OFFSET through increasing in step S1036b and obtain the shading data of described other 32 shading pixels, and digital averaging counting circuit 831 can calculate the mean value of the shading data of described other 32 shading pixels and obtain the first new shading data OB_DATA in step S1036b.Step S1036a and step S1036b can be performed repeatedly, until the first shading data OB_DATA falls in described preset range.When decision circuitry 832 judges that the first shading data OB_DATA is in described preset range, analog offset Circuit tuning 833 can be determined to control to the black rank of carrying out analog domain with analog offset A_OFFSET now.

Again such as, view data reading unit 820 can adjust the primary signal of 32 shading pixels in shading pixel 811 according to analog gain G and analog offset A_OFFSET and obtain the shading data of these 32 shading pixels.Digital averaging counting circuit 831 calculates the mean value of the shading data of these 32 shading pixels and obtains the first shading data OB_DATA.At the first shading data OB_DATA of this hypothesis now corresponding to these 32 shading pixels for being less than 0, and the lower limit of above-mentioned preset range is set to 0.Therefore, in step S1036a, decision circuitry 832 judges that the first shading data OB_DATA is not in described preset range, so that step S1036b is performed.In step S1036b, analog offset Circuit tuning 833 can downgrade analog offset A_OFFSET, such as, reduce 5% of analog offset A_OFFSET.View data reading unit 820 can adjust the primary signal of other 32 the shading pixels in shading pixel 811 according to analog gain G and analog offset A_OFFSET through downgrading in step S1036b and obtain the shading data of described other 32 shading pixels, and digital averaging counting circuit 831 can calculate the mean value of the shading data of described other 32 shading pixels and obtain the first new shading data OB_DATA in step S1036b.Step S1036a and step S1036b can be performed repeatedly, until the first shading data OB_DATA falls in described preset range.

It should be noted that, in one embodiment, if the first shading data OB_DATA that view data reading unit 820 reads is 0, the situation whole in order to avoid excessive black contrast occurs, analog offset Circuit tuning 833 can reduce analog offset A_OFFSET (such as downgrading 5% of former analog offset A_OFFSET) slightly, and view data reading unit 820 and digital averaging counting circuit 831 can adjust according to this after analog offset A_OFFSET and providing fall within the first shading data OB_DATA1 in described preset range to decision circuitry 832.So far, namely black rank control unit 830 completes the adjustment of analog offset A_OFFSET.

In the present embodiment, decision circuitry 832 can use comparator to judge, for used comparator kind, or other possesses circuit or the element of similar functions, and the present invention does not limit.As for analog offset Circuit tuning 833 by such as taking advantage of adder or other combinational circuit with similar calculation function realizes.To this, the present invention does not limit the circuit kind and implementation thereof that realize adjustment analog offset A_OFFSET.

Figure 11 A and Figure 11 B is the schematic flow sheet of the black rank control method of the image sensering device illustrated according to yet another embodiment of the invention.Step S1110, S1120 shown in Figure 11 A and Figure 11 B, S1130, S1131, S1132, S1133, S1134, S1135, S1136, S1136a, S1136b, S1136c and S1140 can analogize it with reference to the related description of step S1010 shown in Figure 10, S1020, S1030, S1031, S1032, S1033, S1034, S1035, S1036, S1036a, S1036b, S1036c and S1040.The step S1140 of Figure 11 A and Figure 11 B comprises sub-step S1141 ~ S1145.

Please refer to Fig. 8, Figure 11 A and Figure 11 B, as mentioned above, step S1130 can use/read the one part of pixel in shading pixel 811 to adjust analog offset A_OFFSET.After the analog offset Circuit tuning 833 of black rank control unit 830 determines to adjust the analog offset A_OFFSET of picture signal in step S1136c, image sensering device 800 then can carry out step S1141.In step S1141, data-sampling circuit 821 reads multiple primary signals of the remainder pixel in shading pixel 811.Then, in step S1142, gain circuitry 822 with the primary signal of remainder pixel described in analog-gain value G gain, to obtain the multiple through gain signal of described remainder pixel in shading pixel 811.In step S1143, first arithmetic element 823a can go with the analog offset A_OFFSET after step S1130 adjustment to adjust that gain circuitry 822 exports is described through gain signal, to obtain the multiple through adjustment signal of described remainder pixel in shading pixel 811.Wherein, the analog offset A_OFFSET after adjustment reoffers to the first arithmetic element 823a after first transferring it to analog form from digital form via digital analog converter 823b.Afterwards, in step S1144, the described multiple numerical datas being converted to the described remainder pixel in shading pixel 811 through adjustment signal that the first arithmetic element 823a exports by analog-digital converter 824 respectively.In step S1145, digital averaging counting circuit 831 calculates the mean value of described numerical data as numerical data side-play amount D_OFFSET.

After analog offset A_OFFSET after obtaining adjustment and numerical data side-play amount D_OFFSET, image sensering device 800 will carry out the correction of black rank to the view data ACT_DATA of photosensitive pixel 812 according to this.Such as in step S1150, view data reading unit 820, by using analog gain G and analog offset A_OFFSET, reads the view data ACT_DATA corresponding to photosensitive pixel 812 respectively.Then, in step S1160, numerical data side-play amount D_OFFSET is transferred to the second arithmetic element 840 by black rank control unit 830, and the second arithmetic element 840 adjusts the view data ACT_DATA corresponding to photosensitive pixel 812 according to numerical data side-play amount D_OFFSET.Such as, in one embodiment, view data ACT_DATA can be deducted numerical data side-play amount D_OFFSET by the second arithmetic element 840 (being such as subtracter), uses the composition removing black rank signal from view data ACT_DATA, and thus obtains preferably output image data.In other embodiments, image sensering device 800 also can realize the above-mentioned subtraction for view data and numerical data side-play amount D_OFFSET by other circuit form, and the present invention does not limit the circuit element kind realizing subtraction.

By this, by the black rank control method proposed in the invention described above embodiment, image sensering device can obtain the numerical data side-play amount D_OFFSET of the analog offset A_OFFSET after adjustment and its correspondence.Analog offset A_OFFSET can revise the rough black rank of the view data ACT_DATA of photosensitive pixel in analog domain.Numerical data side-play amount D_OFFSET can revise the careful black rank of the view data ACT_DATA of photosensitive pixel in the digital domain.Base this, the black rank control method proposed in above-mentioned all embodiments and image sensering device can realize accurate black rank and control.

In further embodiments, image sensering device also can comprise reset cell, uses when analog-gain value G changes, in time adjusts corresponding side-play amount, thus realizes accurate dynamic black rank control.Such as, Figure 12 is according to the present invention's more circuit box schematic diagram of image sensering device of illustrating of an embodiment.Image sensering device 1200 shown in Figure 12 comprises pel array 1210, view data reading unit 1220, black rank control unit 1230, second arithmetic element 1240 and reset cell 1250.Pel array 1210 comprises shading pixel 1211 and photosensitive pixel 1212.Image sensering device 1200 shown in Figure 12, pel array 1210, shading pixel 1211, photosensitive pixel 1212, view data reading unit 1220, black rank control unit 1230 and the second arithmetic element 1240 can analogize it with reference to the related description of image sensering device 800 shown in Fig. 8, pel array 810, shading pixel 811, photosensitive pixel 812, view data reading unit 820, black rank control unit 830 and the second arithmetic element 840.Be different from part embodiment illustrated in fig. 8 to be, in the embodiment of Figure 12, image sensering device 1200 also comprises reset cell 1250.Reset cell 1250 is coupled to black rank control unit 1230.

Figure 13 A and Figure 13 B is the schematic flow sheet of the black rank control method of the image sensering device illustrated according to yet another embodiment of the invention.Step S1310 shown in Figure 13 A and Figure 13 B, S1320, S1330, S1331, S1332, S1333, S1334, S1335, S1336, S1336a, S1336b, S1336c, S1340, S1341, S1342, S1343, S1344, S1345, S1350 and S1360 can with reference to step S1110 shown in Figure 11 A and Figure 11 B, S1120, S1130, S1131, S1132, S1133, S1134, S1135, S1136, S1136a, S1136b, S1136c, S1140, S1141, S1142, S1143, S1144, S1145, the related description of S1150 and S1160 and analogize it.Figure 13 A and Figure 13 B also comprises step S1371 ~ S1374.

Please refer to Figure 12 and Figure 13 A and Figure 13 B, black rank control unit 1230 provide in step S1310 analog gain to side-play amount transformational relation after, reset cell 1250 can utilize a flag FG to judge whether to want adjustment analog offset A_OFFSET and numerical data side-play amount D_OFFSET.Such as, when reset cell 1250 detects that analog-gain value G changes, reset cell 1250 can set flag FG and 1 trigger black rank control unit 1230 and go the adjustment carrying out analog offset A_OFFSET and numerical data side-play amount D_OFFSET to operate; And when reset cell 1250 detects that analog-gain value G does not change, then can set flag FG be 0 make black rank control unit 1230 go keep current analog offset A_OFFSET and current numerical data side-play amount D_OFFSET.For the setting means of above-mentioned flag FG, the present invention is not limited.

In step S1371, flag FG is set as initial value (such as initial value is 1) by reset cell 1250.In step S1372, black rank control unit 1230 judges whether flag FG is 1.When reset cell 1250 judges that flag FG is 1, reset cell 1250 just can trigger black rank control unit 1230 and analog-gain value G is converted to analog offset A_OFFSET (step S1320), and carries out step S1330 and step S1340 and find out analog offset A_OFFSET and numerical data side-play amount D_OFFSET.Therefore after system completes initialization, step S1371 can allow black rank control unit 1230 go the adjustment carrying out analog offset A_OFFSET and numerical data side-play amount D_OFFSET to operate, and makes image sensering device 1200 can obtain analog offset A_OFFSET and numerical data side-play amount D_OFFSET after power-up first.After acquisition analog offset A_OFFSET and numerical data side-play amount D_OFFSET, black rank control unit 1230 can carry out the correction of black rank to the view data ACT_DATA of photosensitive pixel 1212.

It is worth mentioning that, when reset cell 1250 judges/detects that analog-gain value G changes, reset cell 1250 can be set to 1 by flag FG, and the adjustment carrying out analog offset A_OFFSET and numerical data side-play amount D_OFFSET again to trigger black rank control unit 1230 operates (i.e. step S1320, S1330 and S1340).During the adjustment carrying out analog offset A_OFFSET and numerical data side-play amount D_OFFSET operates, flag FG can be set as 0 (step S1373) by black rank control unit 1230, the execution frequency operated with the adjustment reducing analog offset A_OFFSET and numerical data side-play amount D_OFFSET.

When flag FG is 0, represent that analog-gain value G does not change, therefore image sensering device 1200 can the A_OFFSET of adjustment analog offset again and numerical data side-play amount D_OFFSET.Therefore, when step S1372 judges that flag FG is 0, image sensering device 1200 was ignored step S1320, S1330 and S1340 and carried out step S1350 and S1360.In step S1350 and S1360, it is whole that image sensering device 1200 uses the analog offset A_OFFSET through determining and numerical data side-play amount D_OFFSET through determining to carry out black contrast to the sense data of photosensitive pixel 1212 respectively in analog domain and numeric field, to obtain the view data ACT_DATA corresponding to photosensitive pixel 1212.

After completing steps S1360, reset cell 1250 also can the number of times of image frame (image frame) of computed image sensing apparatus 1200 read pixel array 1210, and judge described number of times whether reach threshold value (step S1374).When described number of times not yet reaches threshold value, image sensering device 1200 can be ignored step S1320, S1330 and S1340 (also remaining unchanged by analog offset A_OFFSET and numerical data side-play amount D_OFFSET) and carry out step S1350 and S1360.When step S1374 judges that described number of times reaches threshold value, flag FG can also be set to 1 by reset cell 1250, and the adjustment carrying out analog offset A_OFFSET and numerical data side-play amount D_OFFSET again to trigger black rank control unit 1230 operates (i.e. step S1320, S1330 and S1340).Therefore, image sensering device 1300 can the in time corresponding analog offset A_OFFSET of dynamic conditioning and numerical data side-play amount D_OFFSET according to analog-gain value G instantly at set intervals, use after avoiding image sensering device 1300 to use for a long time and may rise and increase the situation of dark current noise by Yin Wendu, thus realize accurate dynamic black rank control.In other words, the present embodiment reflects by reading picture number of times the change that temperature is possible, and then the impact that release temperature change causes black rank control accuracy.Reset cell 1250 in the present embodiment can comprise in order to calculate the counter reading picture number of times, and utilizes the described number of times gone out described in the more described threshold value of comparator and counter, uses and judges whether read picture number of times reaches number of times threshold value.In another embodiment, judge that reading picture number of times can also use mode reciprocal to count, such as image sensering device 1200 is predeterminable often to be read 10 images and is namely again converted into analog offset A_OFFSET according to analog-gain value G instantly, realizes the function of reset of the present embodiment by this.

The present embodiment does not limit the implementation of step S1374 in Figure 13 A and Figure 13 B.Such as, in other embodiments, reset cell 1350 can replace reading picture number of times with the time in step S1374.That is, reset cell 1350 can be able to count from previous adjustment analog offset A_OFFSET and numerical data side-play amount D_OFFSET time so far in step S1374, and judged whether the time counted reaches time threshold value.When reset cell 1250 judges that the time counted does not reach time threshold value, analog offset A_OFFSET and numerical data side-play amount D_OFFSET can remain unchanged and carry out step S1350 and S1360 by image sensering device 1200.When reset cell 1250 judges that the time counted reaches time threshold value, flag FG just can be set to 1 by reset cell 1250, and the adjustment carrying out analog offset A_OFFSET and numerical data side-play amount D_OFFSET again to trigger black rank control unit 1230 operates (i.e. step S1320, S1373, S1330 and S1340).

In addition, in certain embodiments, image sensering device can also comprise look-up table, wherein records analog gain described in step S1310 in look-up table to side-play amount transformational relation.By this, namely black rank control unit directly obtains analog gain to side-play amount transformational relation by look-up table.Such as, Figure 14 is the circuit box schematic diagram of the image sensering device illustrated according to yet another embodiment of the invention.In the present embodiment, image sensering device 1400 comprises pel array 1410, view data reading unit 1420, black rank control unit 1430 and look-up table 1460.Image sensering device 1400 shown in Figure 14, pel array 1410, shading pixel 1411, photosensitive pixel 1412, view data reading unit 1420 can analogize it with reference to the related description of image sensering device 100 shown in Fig. 1, pel array 110, shading pixel 111, photosensitive pixel 112, view data reading unit 120 and black rank control unit 130 with black rank control unit 1430.Please refer to Figure 14, in the present embodiment, look-up table 1460 can be stored in the storage element of image sensering device 1400.Analog gain is record to side-play amount transformational relation in look-up table 1460.Analog-gain value G according to the analog gain in look-up table 1460 to side-play amount transformational relation, and can be converted to analog offset A_OFFSET by black rank control unit 1430, uses and realizes the control of black rank.

In sum, the image sensering device of the embodiment of the present invention and black rank control method thereof by obtaining analog gain during Startup calibration to side-play amount transformational relation, or obtain analog gain to side-play amount transformational relation from look-up table.Utilize described analog gain to side-play amount transformational relation, analog gain G can be converted to corresponding analog offset A_OFFSET by black rank control unit.In addition, the embodiment of the present invention also utilizes the shading data of shading pixel determine whether adjustment analog offset A_OFFSET and calculate numerical data side-play amount D_OFFSET, thus carries out accurate black rank control.By this, the adjustment that image sensering device described in the embodiment of the present invention and black rank control method thereof can effectively utilize shading region to carry out analog offset A_OFFSET and numerical data side-play amount D_OFFSET operates.In analog gain G change or when causing dark current noise to change when variations in temperature, image sensering device described in the embodiment of the present invention and black rank control method thereof can possess function of reset and in good time dynamic conditioning analog offset A_OFFSET and numerical data side-play amount D_OFFSET, and and then provide preferably output image data.

Although the present invention discloses as above with embodiment; so itself and be not used to limit the present invention; have in any art and usually know the knowledgeable; without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on the appended right person of defining.

Claims

1. a black rank control method for image sensering device, this image sensering device at least comprises pel array, and this pel array comprises multiple shading pixel and multiple photosensitive pixel, and this black rank control method comprises:

There is provided analog gain to side-play amount transformational relation;

Utilize this analog gain to side-play amount transformational relation, analog-gain value is converted to analog offset;

According to the first shading data corresponding to the Part I pixel in the plurality of shading pixel, determine whether adjust this analog offset; And

According to the data of the Part II pixel in the plurality of shading pixel, calculate numerical data side-play amount.

2. black rank according to claim 1 control method, the wherein said step of this analog gain to side-play amount transformational relation that provide comprises:

During Startup calibration, by the multiple sense datas using different analog-gain value to read the plurality of shading pixel respectively, to obtain this analog gain to side-play amount transformational relation.

3. black rank according to claim 2 control method, multiple sense datas of wherein said reading the plurality of shading pixel, comprise to obtain the step of this analog gain to side-play amount transformational relation:

During this Startup calibration, by the sense data using different analog-gain value to read the plurality of shading pixel respectively; And

Utilize the sense data of those analog-gain value of linear regression analysis and the plurality of shading pixel, use obtain analog gain to side-play amount transfer function as this analog gain to side-play amount transformational relation.

4. black rank according to claim 2 control method, multiple sense datas of wherein said reading the plurality of shading pixel, comprise to obtain the step of this analog gain to side-play amount transformational relation:

During this Startup calibration, by the sense data using different analog-gain value to read the plurality of shading pixel respectively;

Utilize the sense data of those analog-gain value of linear regression analysis and the plurality of shading pixel, use and obtain analog gain to side-play amount transfer function;

By the sense data using different side-play amounts to read the plurality of shading pixel respectively, to calculate conversion proportion; And

According to this analog gain, this analog gain is obtained to side-play amount transformational relation to side-play amount transfer function and this conversion proportion.

5. black rank according to claim 4 control method, wherein saidly obtains the step of this analog gain to side-play amount transformational relation according to this analog gain to side-play amount transfer function and this conversion proportion and comprises:

Calculate the product of this analog gain to side-play amount transfer function and this conversion proportion as this analog gain to side-play amount transformational relation.

6. black rank according to claim 1 control method, the wherein said step of this analog gain to side-play amount transformational relation that provide comprises:

Look-up table is provided, wherein records this analog gain in this look-up table to side-play amount transformational relation.

7. black rank according to claim 1 control method, the wherein said step this analog-gain value being converted to this analog offset comprises:

According to photosensitivity during preview screen, determine this analog-gain value; And

Utilize this analog gain to side-play amount transformational relation, this analog-gain value is converted to this analog offset.

8. black rank according to claim 1 control method, the step whether wherein said decision adjusts this analog offset comprises:

Read the primary signal of the shading pixel in the plurality of shading pixel;

With primary signal described in this analog-gain value gain, with obtain this shading pixel through gain signal;

Described through gain signal with the adjustment of this analog offset, to obtain this first shading data; And

According to this first shading data, determine whether adjust this analog offset.

9. black rank according to claim 1 control method, the step whether wherein said decision adjusts this analog offset comprises:

Read multiple primary signals of this Part I pixel in the plurality of shading pixel;

With the plurality of primary signal of this analog-gain value gain, to obtain the multiple through gain signal of this Part I pixel in the plurality of shading pixel;

The plurality of through gain signal with the adjustment of this analog offset, to obtain the multiple through adjustment signal of this Part I pixel in the plurality of shading pixel;

Multiple numerical data is converted to through adjustment signal respectively by the plurality of;

Calculate the mean value of the plurality of numerical data as this first shading data; And

10. black rank according to claim 1 control method, the step whether wherein said decision adjusts this analog offset comprises:

A. judge this first shading data whether in preset range and this analog offset whether be 0; And

B. when this first shading data is not in this preset range or when this analog offset is 0, adjust this analog offset, and obtain in the plurality of shading pixel corresponding to another part pixel shading data as this first shading data according to this analog offset after adjustment, and again carry out described step a.

11. black rank according to claim 10 control methods, the step whether wherein said decision adjusts this analog offset also comprises:

When this first shading data is in this preset range and when this analog offset is not 0, determine the picture element signal adjusting this pel array with this analog offset.

12. black rank according to claim 10 control methods, the step of this numerical data side-play amount of wherein said calculating comprises:

When this first shading data is in this preset range and when this analog offset is not 0, read multiple primary signals of the remainder pixel in the plurality of shading pixel;

With the described primary signal of remainder pixel described in this analog-gain value gain, to obtain the multiple through gain signal of described remainder pixel in the plurality of shading pixel;

The described through gain signal of described remainder pixel is adjusted, to obtain the multiple through adjustment signal of described remainder pixel in the plurality of shading pixel with this analog offset;

Respectively by the described multiple numerical datas being converted to the described remainder pixel in the plurality of shading pixel through adjustment signal of described remainder pixel; And

Calculate the mean value of the plurality of numerical data as this numerical data side-play amount.

13. black rank according to claim 1 control methods, also comprise:

By using this analog offset, read the view data corresponding to the plurality of photosensitive pixel respectively; And

The view data corresponding to the plurality of photosensitive pixel is adjusted according to this numerical data side-play amount.

14. black rank according to claim 1 control methods, the step that this analog-gain value is converted to this analog offset, to side-play amount transformational relation, also comprises by wherein said this analog gain that utilizes:

Judge whether this analog-gain value changes; And

When this analog-gain value changes, re-use this analog gain to side-play amount transformational relation, this analog-gain value is converted to this analog offset.

15. black rank according to claim 1 control methods, the step that this analog-gain value is converted to this analog offset, to side-play amount transformational relation, also comprises by wherein said this analog gain that utilizes:

Judge whether read picture number of times reaches number of times threshold value; And

When this reading picture number of times reaches this number of times threshold value, re-use this analog gain to side-play amount transformational relation, this analog-gain value is converted to this analog offset.

16. black rank according to claim 1 control methods, wherein this analog gain comprises linear equation in two unknowns formula to side-play amount transformational relation, or the multinomial of other power and/or its combination.

17. 1 kinds of image sensering devices, comprising:

At least one pel array, this pel array comprises multiple shading pixel and multiple photosensitive pixel;

View data reading unit, is coupled to this pel array, and wherein this view data reading unit receives the output of this pel array, and exports the view data corresponding to this pel array according to analog-gain value and analog offset; And

Black rank control unit, be coupled to this view data reading unit, wherein this black rank control unit provides analog gain to side-play amount transformational relation, utilize this analog gain, to side-play amount transformational relation, this analog-gain value is converted to an analog offset, determine whether adjusting this analog offset according to the first shading data corresponding to the Part I pixel in the plurality of shading pixel, and go to calculate numerical data side-play amount according to the data of the Part II pixel in the plurality of shading pixel

Wherein this analog offset is exported to this view data reading unit by this black rank control unit, and adjusts according to this numerical data side-play amount the view data that this view data reading unit exports.

18. image sensering devices according to claim 17, wherein said black rank control unit is during Startup calibration, by the multiple sense datas using different analog-gain value to read the plurality of shading pixel respectively, to obtain this analog gain to side-play amount transformational relation.

19. image sensering devices according to claim 18, wherein said black rank control unit is during this Startup calibration, by the sense data using different analog-gain value to read the plurality of shading pixel respectively, and utilize the sense data of those analog-gain value of linear regression analysis and the plurality of shading pixel, use obtain analog gain to side-play amount transfer function as this analog gain to side-play amount transformational relation.

20. image sensering devices according to claim 18, wherein said black rank control unit is during this Startup calibration, by the sense data using different analog-gain value to read the plurality of shading pixel respectively, and utilize the sense data of those analog-gain value of linear regression analysis and the plurality of shading pixel, use and obtain analog gain to side-play amount transfer function, and the sense data by using different side-play amounts to read the plurality of shading pixel respectively, to calculate conversion proportion, and according to this analog gain, this analog gain is obtained to side-play amount transformational relation to side-play amount transfer function and this conversion proportion.

21. image sensering devices according to claim 20, wherein said black rank control unit calculates the product of this analog gain to side-play amount transfer function and this conversion proportion as this analog gain to side-play amount transformational relation.

22. image sensering devices according to claim 17, wherein said image sensering device also comprises:

Look-up table, wherein records this analog gain to side-play amount transformational relation in this look-up table.

23. image sensering devices according to claim 17, wherein said view data reading unit determines this analog-gain value according to photosensitivity during preview screen, and this black rank control unit utilizes this analog gain to side-play amount transformational relation, and this analog-gain value is converted to this analog offset.

24. image sensering devices according to claim 17, wherein said view data reading unit comprises:

Data-sampling circuit, is coupled to this pel array, and wherein this data-sampling circuit receives the output of this pel array, to obtain primary signal;

Gain circuitry, be coupled to this data-sampling circuit to receive described primary signal, wherein this gain circuitry carrys out primary signal described in gain according to this analog gain, to obtain through gain signal; And

Side-play amount Circuit tuning, is coupled to this gain circuitry described through gain signal to receive, and wherein this side-play amount Circuit tuning is described through gain signal according to the adjustment of this analog offset, to export through adjustment signal.

25. image sensering devices according to claim 24, wherein said data-sampling circuit reads the primary signal of the shading pixel in the plurality of shading pixel, this gain circuitry with the described primary signal of this this shading pixel of analog-gain value gain with obtain this shading pixel through gain signal, and adjust the described through gain signal of this shading pixel by this side-play amount Circuit tuning with this analog offset, to obtain this first shading data.

26. image sensering devices according to claim 24, wherein said view data reading unit also comprises:

Analog-digital converter, this analog-digital converter couples this side-play amount Circuit tuning.

27. image sensering devices according to claim 26, wherein said black rank control unit comprises:

Digital averaging counting circuit, this digital averaging counting circuit couples this analog-digital converter;

Wherein this data-sampling circuit reads multiple primary signals of this Part I pixel in the plurality of shading pixel, this gain circuitry with the described primary signal of this this Part I pixel of analog-gain value gain to obtain the multiple through gain signal of this Part I pixel in the plurality of shading pixel, this side-play amount Circuit tuning with this analog offset adjust this Part I pixel described through gain signal to obtain the multiple through adjustment signal of this Part I pixel in the plurality of shading pixel, this analog-digital converter is converted to multiple numerical data by described through adjustment signal respectively, and this digital averaging counting circuit calculates the mean value of described numerical data as this first shading data.

28. image sensering devices according to claim 17, wherein said black rank control unit comprises:

Digital averaging counting circuit, couples this view data reading unit, is converted to this first shading data with the shading data exported by this view data reading unit;

Decision circuitry, couples this digital averaging counting circuit to receive this first shading data, wherein this decision circuitry judge this first shading data whether in preset range and this analog offset whether be 0; And

Analog offset Circuit tuning, couple this decision circuitry and this view data reading unit, wherein when this decision circuitry judges that this first shading data is not in this preset range or when this analog offset is 0, this analog offset Circuit tuning adjusts this analog offset, and this view data reading unit obtains the shading data corresponding to another part pixel in the plurality of shading pixel according to this analog offset.

29. image sensering devices according to claim 28, wherein when this decision circuitry judges that this first shading data is in this preset range and when this analog offset is not 0, this analog offset Circuit tuning determines the picture element signal adjusting this pel array with this analog offset.

30. image sensering devices according to claim 17, wherein said view data reading unit is by using this analog offset, read the view data corresponding to the plurality of photosensitive pixel respectively, and this black rank control unit adjusts the view data corresponding to the plurality of photosensitive pixel according to this numerical data side-play amount.

31. image sensering devices according to claim 17, wherein said image sensering device also comprises:

Reset cell, be coupled to this black rank control unit, wherein this reset cell judges whether this analog-gain value changes, and when this reset cell judges that this analog-gain value changes, this reset cell triggers this black rank control unit and re-uses this analog gain to side-play amount transformational relation, thus this analog-gain value is converted to this analog offset.

32. image sensering devices according to claim 17, wherein said image sensering device also comprises:

Reset cell, be coupled to this black rank control unit, wherein this reset cell judges whether read picture number of times reaches number of times threshold value, and when this reset cell judges that this reading picture number of times reaches this number of times threshold value, this reset cell triggers this black rank control unit and re-uses this analog gain to side-play amount transformational relation, thus this analog-gain value is converted to this analog offset.

33. image sensering devices according to claim 17, wherein said analog gain comprises linear equation in two unknowns formula to side-play amount transformational relation, or the multinomial of other power and/or its combination.