CN207321376U - Solid state image sensor - Google Patents

Solid state image sensor Download PDF

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Publication number
CN207321376U
CN207321376U CN201721382579.8U CN201721382579U CN207321376U CN 207321376 U CN207321376 U CN 207321376U CN 201721382579 U CN201721382579 U CN 201721382579U CN 207321376 U CN207321376 U CN 207321376U
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pixel value
register
analog
pixel
solid state
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颜沁睿
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Shenzhen Horizon Robotics Science and Technology Co Ltd
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Shenzhen Horizon Robotics Science and Technology Co Ltd
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Abstract

It the utility model is related to solid state image sensor.According to an embodiment, there is provided a kind of solid state image sensor, it is characterised in that including：Pel array, has the multiple pixel units being arranged in rows and columns, and each pixel unit has the electrooptical device for converting optical signals into electric signal；Analog-digital converter, the analog electrical signal for each pixel unit to be produced are converted into digital signal to obtain the pixel value of each pixel unit；And output unit, for exporting the difference between current frame pixel value and former frame pixel value.The solid state image sensor of the utility model can only send the pixel value difference to have changed, that is non-zero differential, so as to save data transfer bandwidth, frame per second can be improved, and follow-up image processing operations can be simplified, therefore be especially suitable for video monitoring and the advanced auxiliary driving field of automobile.

Description

Solid state image sensor
Technical field
The utility model relates generally to semiconductor applications, more specifically it relates to a kind of solid state image sensor, it can In the case where not sacrificing resolution ratio and frame per second, volume of transmitted data is substantially reduced, therefore it is auxiliary to be particularly suitable for video monitoring, automobile Help the fields such as driving.
Background technology
Solid state image sensor is had been widely used in daily life, including such as camera, such as mobile phone it Camera, various video monitoring cameras on the portable electric appts of class and being used for of for example being installed on automobile are advanced The shooting of DAS (Driver Assistant System) (ADAS) is first-class.Here, " solid-state " refers to that these imaging sensors are the semiconductor technology systems of being based on Make.Common solid state image sensor includes charge coupling device (CCD) type and complementary metal oxide semiconductor (CMOS) Type, it is to convert optical signals into electric signal using the electrooptical device of such as photodiode etc, so as to obtain figure As data.
The important parameter of solid state image sensor includes resolution ratio and frame per second.Resolution ratio embodies the fine degree of image, Resolution ratio is higher, can more reflect the details of image.Frame per second reflects the time interval between caught different images, and frame per second is got over Height, can more react the slight change between different images.Therefore, in field of image recognition, high resolution ratio and frame per second are beneficial 's.Such as driving field is aided in advanced, when the vehicle runs at a high speed, high resolution ratio and frame per second help to reflect driving environment Details and its at a high speed change, so as to help quickly to form correct driving strategy.
However, the transmission and disposal ability of high resolution ratio and frame per second to data propose challenge.Especially current, rub You soon walk to be at the end law, and the further lifting of hardware capabilities is extremely difficult.High resolution ratio and frame per second can produce Data of raw magnanimity, and need to handle these data, for example, transmission, figure identification and calculation and object (including away from From the calculating of, speed etc.) etc., this is beyond the computing capability of current hardware, and the improvement for only relying on algorithm is to be difficult to solve The certainly problem.Therefore, although existing solid state image sensor has been realized in high resolution ratio and frame per second, in video The fields such as monitoring, the advanced auxiliary driving of automobile, are limited to current hardware computing capability, low resolution and frame per second in can only still selecting Image sensor products.
Therefore, it is still necessary to a kind of imaging sensor, it can realize high resolution ratio and frame per second with a small amount of data, so that Reduce the load of data processing.
Utility model content
For above and other problem of the prior art, the one side of the utility model is that providing a kind of image passes Sensor, it can realize high resolution ratio and frame per second with a small amount of data, and reduce the computational load of successive image processing.
According to an embodiment, there is provided a kind of solid state image sensor, it is characterised in that may include：Pel array, has row Multiple pixel units of row and column are arranged into, each pixel unit has the electrooptical device for converting optical signals into electric signal； Analog-digital converter, the analog electrical signal for each pixel unit to be produced are converted into digital signal to obtain each pixel unit Pixel value；And output unit, for exporting the difference between current frame pixel value and former frame pixel value.
In some instances, the output unit only exports non-zero differential.
In some instances, each column pixel unit is provided with an analog-digital converter, it is every during this is arranged The analog electrical signal that a pixel unit produces is converted into digital signal.
In some instances, the output unit includes：Multiple shift registers, the input terminal of each shift register connect It is connected to corresponding analog-digital converter；Multiple subtracters, an input terminal of each subtracter are connected to corresponding analog-digital converter, Another input terminal is connected to the output terminal of corresponding shift register, so as to export the present frame picture from the analog-digital converter Difference between element value and the former frame pixel value from the shift register；And encoder, it is connected to the multiple subtract Musical instruments used in a Buddhist or Taoist mass, output is encoded by the corresponding pixel address of the difference.
In some instances, the shift length of each shift register in the multiple shift register is equal to respective column Pixel unit quantity.
In some instances, the output unit includes：Shift register, its input terminal are connected to each modulus and turn Parallel operation；Subtracter, one input terminal are connected to each analog-digital converter, and another input terminal is connected to the shift LD The output terminal of device, thus export current frame pixel value from the analog-digital converter with from the previous of the shift register Difference between frame pixel value；And encoder, it is configured to the corresponding pixel address of the difference encoding output.
In some instances, the shift length of the shift register is equal to the number of the pixel unit in the pel array Amount.
In some instances, the output unit includes：The multiple registers set for each column, each register storage There is the former frame pixel value of the pixel unit of respective column；Multiple subtracters, an input terminal of each subtracter are connected to correspondence Analog-digital converter, another input terminal is connected to corresponding register, so as to export the present frame from the analog-digital converter Difference between pixel value and former frame pixel value from the register；Encoder, is connected to the multiple subtracter, with The corresponding pixel address of the difference is encoded into output；And multiple accumulators, it is connected to corresponding subtracter and deposit Device, the difference from the subtracter is added to obtain the present frame with the former frame pixel value in the register Pixel value, and update the former frame pixel value in the register with the current frame pixel value.
In some instances, the output unit includes：Register, for storing the former frame pixel of the pel array Value；Subtracter, one input terminal are connected to each analog-digital converter, and another input terminal is connected to the register, from And export the difference between the current frame pixel value from the analog-digital converter and the former frame pixel value from the register Value；Encoder, is connected to the subtracter, and the corresponding pixel address of the difference is encoded output；And accumulator, The subtracter and the register are connected to, by the former frame in the difference from the subtracter and the register Pixel value is added to obtain the current frame pixel value, and with previous in the current frame pixel value renewal register Frame pixel value.
In some instances, the solid state image sensor further includes：Counter, for the figure exported to the encoder As frame number is counted, and when counting reaches often predetermined frame number, output indication signal；And restorer, in response to from The indication signal of the counter, reset signal is sent to the shift register and the encoder, wherein, in response to described The pixel value wherein stored is reset to predetermined initial value by reset signal, the shift register, and the encoder is output it Next frame image signal be labeled as initial frame.
In some instances, the solid state image sensor further includes：Counter, for the figure exported to the encoder As frame number is counted, and when counting reaches often predetermined frame number, output indication signal；And restorer, in response to from The indication signal of the counter, reset signal is sent to the register and the encoder, wherein, in response to the reset The pixel value wherein stored is reset to predetermined initial value, the next frame that the encoder is output it by signal, the register Picture signal is labeled as initial frame.
The pixel value difference that the solid state image sensor of the utility model has been changed by only sending, i.e. non-zero differential, So as to save data transfer bandwidth, frame per second can be improved, and follow-up image processing operations can be simplified, thus it is very suitable Conjunction uses in video monitoring, the advanced drive assist system of automobile etc..
Brief description of the drawings
Fig. 1 shows the structure diagram of the imaging sensor according to one embodiment of the utility model.
Fig. 2 shows the structure diagram of the output unit of the imaging sensor according to one embodiment of the utility model.
Fig. 3 shows the structure diagram of the output unit of the imaging sensor according to another embodiment of the utility model.
Fig. 4 shows the structure diagram of the output unit of the imaging sensor according to another embodiment of the utility model.
Fig. 5 shows the structure diagram of the output unit of the imaging sensor according to another embodiment of the utility model.
Fig. 6 shows the structure diagram of the output unit of the imaging sensor according to another embodiment of the utility model.
Embodiment
The exemplary embodiment of the utility model described below with reference to accompanying drawings.It is to be understood that these embodiments are only shown Some particular implementations of the utility model, but the scope of the utility model is not limited in any way.Though for example, Exemplary illustration so is carried out with reference to cmos image sensor in some exemplary embodiments below, however, it is understood that this reality CCD imaging sensors can also be applied to new principle.
Fig. 1 shows the structure diagram of the imaging sensor 100 according to one embodiment of the utility model.As shown in Figure 1, figure Picture sensor 100 includes pel array 110, it has the multiple pixel unit P for being arranged in array.Each pixel unit P bags The photo-electric conversion element for converting optical signals into electric signal, such as photodiode are included, and existing various pictures can be used Plain structure, which is not described herein again.Pixel unit P can be arranged in horizontal line and the array of vertical row.For simplicity, here 4 × 4 arrays of pixel unit P are shown, however, it is understood that pel array 110 can include more or fewer pixel units P, and the line number of pel array 110 and columns can be equal to each other or differ.
Imaging sensor 100 further includes row scanning monitor 120 and column scan controller 130 to drive pel array 110. As shown in the figure, row scanning monitor 120 is connected to each row pixel unit P, column scan control by row signal line R1, R2, R3 and R4 Device 130 processed is connected to each row pixel unit P by column signal line C1, C2, C3 and C4.Therefore, each pixel unit P can be connected In the cross part office of corresponding row and column signal wire, and driven by it, so as to perform various operations, such as reset behaviour Make, read operation etc..In this way, the analog electrical signal that each pixel unit P is generated by opto-electronic conversion can pass through column signal Line C1-C4 and be read.
Every column signal line C1, C2, C3 and C4 are also connected to corresponding analog-digital converter ADC, and pixel unit P is generated Analog signal be converted into digital signal.It is appreciated that in pixel unit P photodiode generation photogenerated charge amount with The amount of its light received is directly proportional, which is read as analog electrical signal, which passes through analog-to-digital conversion Device ADC is converted to the pixel value of corresponding magnitude value, i.e. pixel unit P.In currently used system, pixel value can be The scope of 0-255, therefore analog-digital converter ADC can be 8 ADC (28=256).Certainly, analog-digital converter ADC can also It is the ADC of higher or lower position.
During operation, such as row scanning monitor 120 activates row signal line R1, and column scan controller 130 activates column signal line C1, so that the signal of the pixel unit P of the first row first row is read, and is converted into counting by corresponding analog-digital converter ADC Word value, is exported by output unit 140., can be by each pixel by activating different row signal line and column signal line successively The signal of unit P passes sequentially through output unit 140 and exports.Clock control cell 150 can be row scanning monitor 120, arrange and sweep Retouch controller 130 and output unit 140 provides operation required clock signal, with the operation of synchronous each device.
It is to be understood that pixel unit P generations photogenerated charge described above, photogenerated charge signal are read and are converted into The operation of digital value, can with it is described in the prior those are identical, therefore only schematically illustrate relevant device, knot here Structure and operating process.In the following, the output procedure of the pixel value of the utility model will be described in detail on output unit 140. In some embodiments of the utility model, output unit 140 is configured to only export per frame pixel value and former frame pixel value it Between non-zero differential.That is, when the current frame pixel value of a pixel is identical with former frame pixel value, output unit 140 do not export the present frame pixel value；When the current frame pixel value of a pixel is different from former frame pixel value, output is single Member 140 exports current frame pixel value and the difference of former frame pixel value.
Fig. 2 shows the structure diagram of the output unit 140 of the imaging sensor according to one embodiment of the utility model.Such as figure Shown in 2, in this embodiment, the output of each analog-digital converter ADC may be connected to shift register 142 and subtracter 144.Move The input terminal of bit register 142 is connected to analog-digital converter ADC, and output terminal is connected to subtracter 144, its shift length is equal to The number of the pixel unit P of row corresponding to ADC, such as can be 4 in the present embodiment.When initial, shift register 142 can To be initialized to predetermined initial value, such as every was all 0 (corresponding to normally black mode), or every is all 255 (corresponding In normal white mode), naturally it is also possible to it is other initial values.
During operation, when ADC exports the pixel value P of first pixel unit P corresponding with the first frame, the row11When, displacement Whole legacy datas in register 142 are moved rearwards one, pixel value P11It is stored in first of shift register 142 In, and last position of shift register 142 is output, and output valve is predetermined value such as 0 at this time.At subtracter 144, as Plain value P11The predetermined value of the output of shift register 142 is subtracted, and by difference (P11- 0) encoder 146 is supplied to for coding Output.
And so on, when ADC is sequentially output the picture of the second to the 4th pixel unit P in, the row corresponding with the first frame Plain value P12-P14When, pixel value P14-P11Stored successively into shift register 142, wherein P14Positioned at first, P11It is located at Last position, and subtracter 144 has been sequentially output pixel value P11-P14With the difference (P of initial value 011-0)、(P12-0)、 (P13- 0) and (P14- 0) for the coding output of encoder 146.
Next, when ADC exports the pixel value P of first pixel unit P corresponding with the second frame, the row21When, displacement Total data P in register 14214-P11One is moved rearwards, pixel value P21It is stored in first of shift register 142 In, and last position of shift register 142 is output, and output valve is P at this time11.At subtracter 144, the second frame pixel Value P21Subtract the first frame pixel value P11, and the difference (P21-P11) encoder 146 is provided to so that coding exports.
And so on, when ADC is sequentially output the picture of the second to the 4th pixel unit P in, the row corresponding with the second frame Plain value P22-P24When, pixel value P24-P21Stored successively into shift register 142, wherein P24Positioned at first, P21It is located at Last position, and subtracter 144 has been sequentially output the second frame pixel value P21-P24With the first frame pixel value P11-P14Difference (P21-P11)、(P22-P12)、(P23-P13) and (P24-P14) for the coding output of encoder 146.
In this way, by performing aforesaid operations, the current frame pixel value of each column pixel is stored in shift register 142, And subtracter 144 is outputed between the current frame pixel value of each pixel and former frame pixel value (or predetermined initial value) Difference for encoder 146 encode export.
When encoder 146 receives the difference, it is first determined whether the difference is zero.When the difference is zero, show this The pixel value of pixel does not change, then encoder 146 abandons the pixel value, does not carry out coding output to it.If the difference Value is not zero, and shows that the pixel value of the pixel is changed, then encoder 146 carries out coding output to the difference.Encode defeated Go out including by the difference and its corresponding address (coordinate value in other words), such as pixel row number and column number etc., being compiled into pre- Fix formula, and exports to external equipment.For example, it may include frame beginning flag, frame end mark in the signal that encoder 146 exports Will and each pixel value difference positioned there between and corresponding pixel coordinate value etc..In the signal that encoder 146 exports It can also include other marks, such as the mark of some attributes (for example whether being initial frame) of the mark present frame described below Will.
In the figure 2 example, illustrating each ADC only has an output line, it is connected to a displacement and posts Storage 142 and subtracter 144, in fact, each ADC can have a plurality of output line.For example, for common 8 ADC, its It is enough for 256 gray scale images, then with 8 output lines.At this time, 8 output lines can be connected respectively to 8 it is corresponding Shift register 142, and 8 minuend input ports of subtracter 144 are connected to, while 8 corresponding shift registers 142 are connected respectively to another 8 minuend input ports of subtracter 144, so as to complete 8 present frames in subtracter 144 The subtraction of pixel value and former frame pixel value.Certainly, the digit depending on ADC, it is possibility to have the output of other numbers Line.
As described above, only exported according to the imaging sensor 100 of one embodiment of the utility model per it is in two field picture, with before One two field picture compares the pixel change difference of those pixels to have changed.If the pixel value of certain pixel front and rear two frame it Between do not change, then can not export the pixel value of the pixel.With the biography of every two field picture of traditional output all pixels Sensor is compared, and the imaging sensor 100 of the utility model has the advantages that some.First, it is highly suitable for video monitoring and takes the photograph As head.Video monitoring camera is usually used in fixed surveillance scene, its visual field seldom changes, therefore the Background in scene As also seldom changing.If applying the imaging sensor of the utility model in this kind of camera, can be greatly decreased The number for the pixel value to be transmitted, so as to reduce data transfer bandwidth and memory space requirements, and can also reduce number in per frame According to processing procedure.And on the other hand, the complete image of present frame can be easily recovered based on initial value and these differences, because This will not damage the resolution ratio of image.In addition, the imaging sensor 100 of the utility model be also very suitable for be used as it is advanced drive it is auxiliary The vehicle-mounted camera in auxiliary system field.In addition to foregoing reduction data transfer bandwidth and memory space requirements, the utility model Principle can also put forward high frame rate, such as can reach 100FPS or more frame speed, so as to detect pair of high-speed motion in time As so as to make correct driving strategy.In addition, the image processing process in advanced drive assist system field, it is often necessary to The pixel value difference between sequential frame image is calculated, this can expend substantial amounts of computing capability, and the imaging sensor of the utility model Output data be exactly pixel value difference, therefore the computing capability of this aspect can be saved.Certainly, the image sensing of the utility model Device also can be suitably used for many other fields, and produce corresponding good technique effect, this is right under the teaching of the utility model It is obvious for those skilled in the relevant art.
Fig. 3 shows the structure diagram of the output unit 140 of the imaging sensor according to another embodiment of the utility model.Figure The principle of 3 output unit 140 is similar with Fig. 2, therefore will only describe its different piece below.
In the structure diagram of Fig. 2, each ADC is connected to corresponding shift register 142 and subtracter 144；And in Fig. 3 Structure diagram in, all ADC may be connected to public shift register 142 and subtracter 144.Therefore, the shifting in Fig. 3 The length of bit register 142 should be the sum of length of all shift registers 142 in Fig. 2.In other words, each shifting in Fig. 2 Bit register 142 only needs to store the pixel value of each column pixel；And the shift register 142 in Fig. 3 needs to store all row pictures The pixel value of element, that is, need to store the pixel value of complete frame pixel.But the output unit 140 of Fig. 3 only needs to use one A subtracter 144, and the digit of subtracter 144 can be identical with the embodiment of Fig. 2, therefore the embodiment of Fig. 3 reduces The use of subtracter 144, so as to simplify circuit.
The operation of the output unit 140 of Fig. 3 and Fig. 2 are essentially identical, and difference part is only that the pixel value of each column pixel all It is stored in same shift register 142, therefore is not repeated herein and describes its specific operation process.
Fig. 4 shows the structure diagram of the output unit 140 of the imaging sensor according to another embodiment of the utility model.With Embodiment shown in Fig. 2 and Fig. 3 is different, and the output unit 140 shown in Fig. 4 is no to use shift register, and uses commonly Register 152.
As shown in figure 4, the current frame pixel value of each ADC outputs is provided to subtracter 144, in each register 152 It is stored with the former frame pixel value of the pixel of respective column.In subtracter 144, the current frame pixel of a certain pixel of ADC outputs Value subtracts the former frame pixel value of the pixel stored in register 152, and gained difference is exported to encoder 146 for coding Output.In addition, gained difference is accumulated to the former frame pixel value of the pixel stored in register 152 by accumulator 154 On, so as to be updated to current frame pixel value, it is ready for the calculating of next frame pixel value.The operation of encoder 146 with Previous embodiment is identical, and details are not described herein again.
Fig. 5 shows the structure diagram of the output unit 140 of the imaging sensor according to another embodiment of the utility model.With The embodiment of Fig. 3 is similar, in the 5 embodiment of figure 5, all ADC is connected to public subtracter 144, and all pixels Use public register 152 and accumulator 154.In the fig. 4 embodiment, each register 152 only needs to be enough to store pair The address space for the pixel value that should be arranged；And in the 5 embodiment of figure 5, register 152 needs to be enough to store whole pel array The address space of pixel value.Compared with the embodiment of Fig. 4, the embodiment of Fig. 5 saves of subtracter 144 and accumulator 154 Number, therefore make circuit more simplified.The operation of encoder 146 is identical with previous embodiment, and details are not described herein again.
In embodiment described above, by only output pixel changing value, many benefits are brought, such as save data Transmission bandwidth, put forward high frame rate etc..But when the pixel value of a certain frame mistake occurs because of certain reason, after may result in Continuous mistake can all occur in the pixel value for continuing all frames.In order to avoid such case, in some embodiments of the utility model, Also introduce reset mechanism.
Fig. 6 shows the structure diagram for the output unit 140 for including reset mechanism.As can be seen that the embodiment of Fig. 6 is to be based on Embodiment shown in Fig. 3, introduces reset mechanism, however, it is understood that reset mechanism can also be applied to shown in Fig. 2,4 and 5 in fact Apply in any embodiment in example.
With reference to Fig. 6, in addition to including shift register 142, subtracter 144 and encoder 146, output unit 140 is also It may include counter 162 and restorer 164.The number of image frames that counter 162 can export output unit 140 counts, Predetermined number destination frame, such as 8 frames, 10 frames or 16 frames etc. are often exported, just send an indication signal to restorer 164.Restorer 164 in response to counter 162 indication signal, send reset signal to shift register 142 and encoder 146.Shift LD The data wherein stored are all reset to predetermined initial value in response to reset signal by device 142, such as 0 above illustrated. Encoder 146 in its coding output sets flag to indicate that the frame is initial frame or follow-up (non-in response to reset signal Initially) frame.If initial frame, when recovering original pixel value based on pixel value difference, it is only necessary to plus predetermined initial value； If subsequent frame, then need to add former frame pixel value, in other words difference above all since initial frame and predetermined The accumulated value of initial value.In this way, by periodically resetting operation, even if mistake occurs in some pixel value, it can also be when resetting Corrected, without continuing up to follow-up all picture frames.
It is similar with the embodiment shown in Fig. 6, can be with when introducing regular reset mechanism in the embodiment shown in Figure 4 and 5 When counter 162 count down to predetermined frame number, restorer 164 sends reset signal.In response to the reset signal, make register The pixel value stored in 152 is reset to predetermined initial value, and encoder 146 is referred to when coding exports next frame pixel value It is initial frame to show the frame pixel value.In this way, also achieving the regular reset of output signal, the pixel value mistake in certain frame is avoided Continuous mistake caused by possible.
The basic principle of the application is described above in association with specific embodiment, however, it is desirable to, it is noted that in this application The advantages of referring to, advantage, effect etc. are only exemplary rather than limiting, it is impossible to which it is the application to think these advantages, advantage, effect etc. Each embodiment is prerequisite.In addition, detail disclosed above is merely to exemplary effect and the work readily appreciated With, and it is unrestricted, above-mentioned details is not intended to limit the application as that must be realized using above-mentioned concrete details.
The block diagram of device, device, equipment, system involved in the application only illustratively the example of property and is not intended to It is required that or hint must be attached in the way of square frame illustrates, arrange, configure.As it would be recognized by those skilled in the art that , it can connect, arrange by any-mode, configuring these devices, device, equipment, system.Such as " comprising ", "comprising", " tool Have " etc. word be open vocabulary, refer to " including but not limited to ", and can be used interchangeably with it.Vocabulary used herein above "or" and " and " refer to vocabulary "and/or", and can be used interchangeably with it, unless it is not such that context, which is explicitly indicated,.Here made Vocabulary " such as " refers to phrase " such as, but not limited to ", and can be used interchangeably with it.
It may also be noted that in device, apparatus and method in the application, each component or each step are to decompose And/or reconfigure.These decompose and/or reconfigure the equivalents that should be regarded as the application.
The above description of disclosed aspect is provided so that any person skilled in the art can make or use this Application.Various modifications in terms of these are readily apparent to those skilled in the art, and are defined herein General Principle can be applied to other aspect without departing from scope of the present application.Therefore, the application is not intended to be limited to Aspect shown in this, but according to the widest range consistent with principle disclosed herein and novel feature.
In order to which purpose of illustration and description has been presented for above description.In addition, this description is not intended to the reality of the application Apply example and be restricted to form disclosed herein.Although already discussed above multiple exemplary aspects and embodiment, this area skill Art personnel will be recognized that its some modifications, modification, change, addition and sub-portfolio.

Claims (11)

  1. A kind of 1. solid state image sensor, it is characterised in that including：
    Pel array, has the multiple pixel units being arranged in rows and columns, and each pixel unit, which has, converts optical signals into electricity The electrooptical device of signal；
    Analog-digital converter, the analog electrical signal for each pixel unit to be produced are converted into digital signal to obtain each pixel The pixel value of unit；And
    Output unit, for exporting the difference between current frame pixel value and former frame pixel value.
  2. 2. solid state image sensor as claimed in claim 1, it is characterised in that the output unit only exports non-zero differential.
  3. 3. solid state image sensor as claimed in claim 1, it is characterised in that each column pixel unit is provided with an institute Analog-digital converter is stated, the analog electrical signal that each pixel unit during this is arranged produces is converted into digital signal.
  4. 4. solid state image sensor as claimed in claim 3, it is characterised in that the output unit includes：
    Multiple shift registers, the input terminal of each shift register are connected to corresponding analog-digital converter；
    Multiple subtracters, an input terminal of each subtracter are connected to corresponding analog-digital converter, and another input terminal is connected to The output terminal of corresponding shift register, so as to export the current frame pixel value from the analog-digital converter and come from the shifting Difference between the former frame pixel value of bit register；And
    Encoder, is connected to the multiple subtracter, and the corresponding pixel address of the difference is encoded output.
  5. 5. solid state image sensor as claimed in claim 4, it is characterised in that each shifting in the multiple shift register The shift length of bit register is equal to the quantity of the pixel unit of respective column.
  6. 6. solid state image sensor as claimed in claim 3, it is characterised in that the output unit includes：
    Shift register, its input terminal are connected to each analog-digital converter；
    Subtracter, one input terminal are connected to each analog-digital converter, and another input terminal is connected to the shift LD The output terminal of device, thus export current frame pixel value from the analog-digital converter with from the previous of the shift register Difference between frame pixel value；And
    Encoder, for the corresponding pixel address of the difference to be encoded output.
  7. 7. solid state image sensor as claimed in claim 6, it is characterised in that the shift length of the shift register is equal to The quantity of pixel unit in the pel array.
  8. 8. solid state image sensor as claimed in claim 3, it is characterised in that the output unit includes：
    The multiple registers set for each column, each register are stored with the former frame pixel value of the pixel unit of respective column；
    Multiple subtracters, an input terminal of each subtracter are connected to corresponding analog-digital converter, and another input terminal is connected to Corresponding register, so as to export the current frame pixel value from the analog-digital converter and the former frame from the register Difference between pixel value；
    Encoder, is connected to the multiple subtracter, and the corresponding pixel address of the difference is encoded output；And
    Multiple accumulators, are connected to corresponding subtracter and register, and the difference from the subtracter is posted with described Former frame pixel value in storage is added to obtain the current frame pixel value, and described in current frame pixel value renewal Former frame pixel value in register.
  9. 9. solid state image sensor as claimed in claim 3, it is characterised in that the output unit includes：
    Register, for storing the former frame pixel value of the pel array；
    Subtracter, one input terminal are connected to each analog-digital converter, and another input terminal is connected to the register, from And export the difference between the current frame pixel value from the analog-digital converter and the former frame pixel value from the register Value；
    Encoder, is connected to the subtracter, and the corresponding pixel address of the difference is encoded output；And
    Accumulator, is connected to the subtracter and the register, by the difference from the subtracter and the deposit Former frame pixel value in device is added to obtain the current frame pixel value, and is posted described in current frame pixel value renewal Former frame pixel value in storage.
  10. 10. the solid state image sensor as described in claim 4 or 6, it is characterised in that further include：
    Counter, the number of image frames for being exported to the encoder count, and when counting reaches often predetermined frame number, Output indication signal；And
    Restorer, in response to the indication signal from the counter, sends multiple to the shift register and the encoder Position signal,
    Wherein, the pixel value wherein stored is reset to predetermined initial value in response to the reset signal, the shift register, Next frame image signal that the encoder is output it is labeled as initial frame.
  11. 11. solid state image sensor as claimed in claim 8 or 9, it is characterised in that further include：
    Counter, the number of image frames for being exported to the encoder count, and when counting reaches often predetermined frame number, Output indication signal；And
    Restorer, in response to the indication signal from the counter, reset letter is sent to the register and the encoder Number,
    Wherein, in response to the reset signal, the pixel value wherein stored is reset to predetermined initial value by the register, described Next frame image signal that encoder is output it is labeled as initial frame.
CN201721382579.8U 2017-10-25 2017-10-25 Solid state image sensor Active CN207321376U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107635086A (en) * 2017-10-25 2018-01-26 深圳地平线机器人科技有限公司 Solid state image sensor and image-sensing method

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