WO2019153327A1 - Procédé et appareil d'acquisition d'images - Google Patents

Procédé et appareil d'acquisition d'images Download PDF

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Publication number
WO2019153327A1
WO2019153327A1 PCT/CN2018/076437 CN2018076437W WO2019153327A1 WO 2019153327 A1 WO2019153327 A1 WO 2019153327A1 CN 2018076437 W CN2018076437 W CN 2018076437W WO 2019153327 A1 WO2019153327 A1 WO 2019153327A1
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WO
WIPO (PCT)
Prior art keywords
photosensor
light
cells
area
coding
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Application number
PCT/CN2018/076437
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English (en)
Chinese (zh)
Inventor
蒋鹏
汪海翔
凌伟
Original Assignee
深圳市汇顶科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to CN201880000178.2A priority Critical patent/CN108323208A/zh
Priority to PCT/CN2018/076437 priority patent/WO2019153327A1/fr
Publication of WO2019153327A1 publication Critical patent/WO2019153327A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V20/00—Scenes; Scene-specific elements
    • G06V20/50—Context or environment of the image
    • G06V20/52—Surveillance or monitoring of activities, e.g. for recognising suspicious objects
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
    • G06F18/20—Analysing
    • G06F18/24—Classification techniques
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/70—Arrangements for image or video recognition or understanding using pattern recognition or machine learning
    • G06V10/82—Arrangements for image or video recognition or understanding using pattern recognition or machine learning using neural networks

Definitions

  • the present application relates to the field of biometrics, and in particular, to an image acquisition method and apparatus.
  • An optical fingerprinting device applied to a mobile phone device is usually composed of a plurality of laminates.
  • a typical stacked structure is an organic light-emitting diode (OLED) display, a periodic prism array, an optical filter, and a photosensor array. Since the spatial period of the OLED display pixel unit, the spatial period of the prism array hole, and the spatial arrangement period of the photosensor array are relatively close, the fingerprint image outputted by the photosensor array detects the moire fringe. When the moiré fringe is close to the spatial period of the fingerprint pressed on the OLED display screen, the recognition efficiency of the fingerprint is affected. In addition, the structure of the entire laminate may be affected by temperature and pressure, which causes the spatial dispersion of the moiré fringes, which also has a large impact on the fingerprint recognition.
  • the present application provides an image acquisition method and apparatus capable of reducing moiré fringes.
  • the photosensor array is divided into a plurality of photosensor groups including the same number of photosensors, and at least one target photosensor is determined out of order in each photosensor group, the photosensor
  • the target photosensor in the array outputs image data, so that spatially non-periodic sampling can break the law of periodic periodic sampling in the low resolution mode of the existing photosensor array, and can eliminate the moire fringe interference. It can eliminate the moire fringe interference caused by temperature drift.
  • out-of-order sampling with low resolution mode also solves the problem that high-resolution images consume more hardware resources and power consumption when performing digital image processing.
  • the at least one target photosensor is determined out of order, including: The at least one target photosensor is randomly determined in the photosensor group.
  • each of the photosensor groups includes four photosensors.
  • the at least one target photosensor is determined out of order in each photosensor group of the plurality of photosensor groups included in the photosensor array
  • the method includes: determining a target photosensor in each of the photosensor groups, or determining two target photosensors in each of the photosensor groups.
  • an image acquisition method comprises an image acquisition device, the device comprising a light source, an out-of-order spatial coding plate and a photosensor array, the method comprising: reflecting the light emitted by the light source through the object to be tested Up to the out-of-order space coding board; the spot of the light passing through the out-of-order space coding board is spatially arranged out of order by the out-of-order space coding plate; and the photoelectric sensor array collects the object to be tested according to the light spot Image data; according to the image data, an image is acquired.
  • a relative position, an area, and a shape of a transparent region of any two adjacent coding cells in the plurality of coding cells are At least one different.
  • the transparent area of the out-of-order space coded version is a hole in the out-of-order space coded version.
  • the transparent area of the out-of-order space coded version is a transparent medium.
  • the transparent medium is glass or resin.
  • the device further includes a photomask, the photomask is located between the out-of-order spatial coding board and the photosensor array
  • the photomask includes a light-transmissive region and an opaque region that are unevenly distributed, after the spatial patches of the light passing through the out-of-order spatial encoding plate are randomly arranged in space by the out-of-order spatial encoding plate.
  • the method further includes spatially disorderly arranging the spots of the light passing through the photomask through the photomask.
  • the out-of-order spatial coding board is a photomask.
  • the apparatus further includes a periodic prism array located between the light source and the out-of-order spatial coding board, including a light-transmitting region and an opaque region, wherein the light emitted by the light source is reflected by the object to be measured to the disordered spatial code plate, comprising: passing the transparent prism array through the periodic prism array The light is evenly distributed in space.
  • the apparatus further includes a periodic prism array located between the light source and the out-of-order spatial coding board, including a light transmissive area and an opaque area, the method further comprising: passing the periodic prism array before the spatially out-of-sequence arrangement of the light spots of the light passing through the out-of-order spatial coding plate by the out-of-order space coding plate Having the light passing through the light-transmissive region of the periodic prism array uniformly spatially distributed; the spatially-sequentially arranged light spots of the light passing through the out-of-order spatial code plate are randomly arranged in space, including: The out-of-order spatial encoding plate is transmitted to the photosensor array after the received light that has passed through the periodic prism array is redirected.
  • the periodic prism array is divided into a plurality of prism cells having the same shape and area, and each of the plurality of prism cells The cell is divided into a light transmissive area and an opaque area.
  • the relative position and area of the light transmissive area of each prism cell are the same, and the relative position is the position of the light transmissive area relative to the prism cell in which it is located.
  • the out-of-order spatial coding board is a transparent material.
  • the out-of-order spatial coding board is divided into a plurality of coding cells having the same shape and area, and the plurality of coding cells and the multiple Each of the plurality of coding cells includes a concave portion, and at least two of the plurality of coding cells have a relative position, an area, and a shape of the concave portion of the at least two coding cells
  • the relative position is the position of the recessed portion relative to the coded cell in which it is located.
  • At least one of a relative position, an area, and a shape of a recessed portion of any two adjacent coded cells in the plurality of coded cells different.
  • the light transmissive area of the periodic prism array is a hole in the periodic prism array.
  • the transparent region of the periodic prism array is a transparent medium.
  • the transparent medium is glass or resin.
  • an image acquisition apparatus comprising: a light source, an out-of-order spatial coding board, and a photosensor array, wherein the light source is used for illumination, and the light is reflected by the object to be tested to the out-of-order spatial coding board.
  • the out-of-order spatial coding board is located between the light source and the photosensor array for causing the light passing through the out-of-order spatial coding board to be randomly arranged in a spatial order; the photosensor array is configured to be based on the light spot And collecting image data of the object to be tested.
  • the image acquiring apparatus of the embodiment of the present invention can perform the out-of-order arrangement of the light reflected by the object to be detected to the photosensor array by the out-of-order spatial encoding board, so that the image obtained by the photoelectric sensor array processing can eliminate the moire fringe. .
  • the out-of-order spatial coding board includes a light-transmissive area and an opaque area that are unevenly distributed.
  • a relative position, an area, and a shape of a light transmissive region of any two adjacent coding cells in the plurality of coding cells are At least one different.
  • the transparent area of the out-of-order space coded version is a hole in the out-of-order space coded version.
  • the transparent area of the out-of-order space coded version is a transparent medium.
  • the transparent medium is glass or resin.
  • the device further includes a photomask, the photomask is located between the out-of-order spatial coding board and the photosensor array
  • the photomask includes a light-transmissive region and an opaque region that are unevenly distributed.
  • the out-of-order spatial coding board is a photomask.
  • the light transmittance of the photomask is greater than or equal to 70% and less than or equal to 80%.
  • the apparatus further includes a periodic prism array, the periodic prism array being located between the light source and the out-of-order spatial coding board, including The light transmissive area and the opaque area are used to spatially distribute the light passing through the periodic prism array.
  • the periodic prism array is divided into a plurality of prism cells having the same shape and area, and each of the plurality of prism cells The cell is divided into a light-transmissive area and an opaque area.
  • the relative positions and areas of the light-transmitting areas of the plurality of prism cells are the same, and the relative position is the position of the light-transmitting area relative to the prism cell in which it is located.
  • the transparent region of the periodic prism array is a hole in the periodic prism array.
  • the transparent region of the periodic prism array is a transparent medium.
  • the transparent medium is glass or resin.
  • the image acquiring apparatus of the embodiment of the present invention can perform the out-of-order arrangement of the light reflected by the fingerprint to be detected to the photosensor array by the out-of-order spatial encoding board, so that the image obtained by the photoelectric sensor array processing can eliminate the moire fringe.
  • the device is an optical fingerprint module
  • the thickness of the entire optical fingerprint module can be increased or decreased, which is beneficial to the design of the ultra-thin optical fingerprint recognition sensor module.
  • an image acquisition apparatus comprising: a light source, an out-of-order spatial coding board, and a photosensor array, wherein the light source is used for illumination, and the light is reflected by the object to be tested to the out-of-order spatial coding board.
  • the out-of-order spatial coding board is located between the light source and the photosensor array for causing the light passing through the out-of-order spatial coding board to be randomly arranged in a spatial order; the photosensor array is configured to be based on the light spot And collecting image data of the object to be tested.
  • the apparatus further includes a periodic prism array disposed between the light source and the out-of-order spatial coding plate, including a light transmissive area and being impermeable a light region for spatially evenly distributing light passing through the periodic prism array; the out-of-order spatial encoding plate is configured to transmit to the photosensor after the received light passing through the periodic prism array is redirected Array.
  • a periodic prism array disposed between the light source and the out-of-order spatial coding plate, including a light transmissive area and being impermeable a light region for spatially evenly distributing light passing through the periodic prism array; the out-of-order spatial encoding plate is configured to transmit to the photosensor after the received light passing through the periodic prism array is redirected Array.
  • the out-of-order spatial coding board is a transparent material.
  • the out-of-order spatial coding board is divided into a plurality of coding cells having the same shape and area, and the plurality of coding cells and the multiple Each of the plurality of coding cells includes a concave portion, and at least two of the plurality of coding cells have a relative position, an area, and a shape of the concave portion of the at least two coding cells
  • the relative position is the position of the concave portion relative to the coded cell in which it is located
  • At least one of a relative position, an area, and a shape of a recessed portion of any two adjacent coded cells in the plurality of coded cells different.
  • the transparent region of the periodic prism array is a hole in the periodic prism array.
  • the transparent region of the periodic prism array is a transparent medium.
  • the transparent medium is glass or resin.
  • the image acquiring apparatus of the embodiment of the present invention can perform the out-of-order arrangement of the light reflected by the object to be detected to the photosensor array by the out-of-order spatial encoding board, so that the image obtained by the photoelectric sensor array processing can eliminate the moire fringe.
  • the device is an optical fingerprint module
  • the thickness of the entire optical fingerprint module can be increased or decreased, which is beneficial to the design of the ultra-thin optical fingerprint recognition sensor module.
  • an image acquisition apparatus for performing the method of any of the above first aspect or any of the possible implementations of the first aspect.
  • the apparatus comprises means for performing the method of any of the above-described first aspect or any of the possible implementations of the first aspect.
  • an image obtaining apparatus comprising: a storage unit for storing an instruction, the processor for executing an instruction stored by the memory, and executing, by the processor, the instruction stored in the memory The execution causes the processor to perform the method of the first aspect or any possible implementation of the first aspect.
  • a seventh aspect a computer readable medium for storing a computer program, the computer program comprising instructions for performing the method of the first aspect or any of the possible implementations of the first aspect.
  • a computer program product comprising instructions for performing an image in any of the above-described first aspect or any of the possible implementations of the first aspect when the computer runs the finger of the computer program product Get the method.
  • the computer program product can be run on the image acquisition device of the above third aspect.
  • FIG. 1 is a schematic diagram of an optical fingerprinting module stack in accordance with an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a photosensor array in accordance with an embodiment of the present application.
  • FIG. 4 is an image obtained by a photosensor array in a high resolution mode and a low resolution mode, respectively, according to an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of an image acquisition method according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a randomly determined target photosensor array in accordance with an embodiment of the present application.
  • Figure 13 is a schematic illustration of a photomask according to an embodiment of the present application.
  • FIG. 14 is a schematic illustration of a periodic prism array in accordance with an embodiment of the present application.
  • 15 is a schematic diagram of an out-of-order spatial coding board in accordance with an embodiment of the present application.
  • FIG. 16 is a schematic block diagram of an image acquisition device according to another embodiment of the present application.
  • FIG. 17 is a schematic diagram of an out-of-order spatial coding board according to another embodiment of the present application.
  • the display screen 101 may be an OLED display screen, and the display screen includes a light-emitting display pixel, which may provide a light source for the fingerprint detection process, and the light emitted by the display screen 101 illuminates the finger to be detected and is reflected by the finger to be detected.
  • a light-emitting display pixel which may provide a light source for the fingerprint detection process, and the light emitted by the display screen 101 illuminates the finger to be detected and is reflected by the finger to be detected.
  • an adhesive layer 102 which may be a foam frame glue, which is glued under the display screen 101 by the foam frame, and the adhesive layer 102 forms a hollow structure.
  • a periodic prism array 103 which can be used to adjust the optical path, ie to adjust the light reflected by the finger, to eliminate the interference of stray light in the non-vertical direction, through the periodic prism array
  • the light after 103 is periodically arranged in space.
  • An optical filter 104 can be placed under the periodic prism array 103 for optical filtering.
  • a photosensor array 105 is placed under the optical filter 104.
  • each photosensor 2 can be regarded as a photosensor array in a high resolution mode, in which each photosensor senses an optical signal and processes the sensed optical signal to output fingerprint image data, according to the output
  • the fingerprint image obtains a fingerprint image for fingerprint recognition, and each pixel of the fingerprint image may correspond to each photosensor in the photosensor array.
  • each photosensor group also includes four photosensors, which adopt spatial periodic sampling, that is, a photosensor array. Inducing the optical signal, but only one photosensor in each photosensor group outputs fingerprint image data, for example, only the first photosensor output in each photosensor group in FIG. 3, and the fingerprint image obtained according to the fingerprint image data,
  • Each pixel in the fingerprint image corresponds to each photosensor group in FIG. 3 .
  • the data of each pixel in the fingerprint image comes from the photosensor 1 in the corresponding photosensor group.
  • Figure 4 shows images obtained by the photosensor array in high resolution mode and low resolution mode, respectively, in which the moire fringes appear in the low resolution mode of spatial periodic sampling, that is, when low resolution is applied.
  • an optical fingerprint recognition module of the laminated configuration shown in FIG. 1 may have moire fringes.
  • moiré fringes usually results in a grating with a relatively close period of two periods of staggered formation and a bright and dark streak.
  • Aliasing occurs when two closely spaced stacks are stacked, such as between the display screen and the periodic prism array, or between the periodic prism array and the photosensor array.
  • the periods are assumed to be ⁇ 1 and ⁇ 2 , respectively, and for the one-dimensional signal sig, it can be represented by (1), where A represents the amplitude, Indicates the phase between the stacks corresponding to ⁇ 1 and ⁇ 2 .
  • the optical fingerprint module When the optical fingerprint module is in high resolution mode, there will be dense pinstripes, about two pixels in size. For example, the density of the pinstripes in the high resolution mode is about 100um, and for the undersampling mode. In low resolution mode, the density of the thick diagonal stripes is about 350um.
  • the optical fingerprint module image on the left side of FIG. 4 the optical fingerprint module imaging image in the low-resolution mode on the right side of FIG. 4, and moire fringes appear in the low-resolution mode.
  • the fringe representation is characterized by a superposition of denser two-dimensional moiré fringes and coarsely slanted one-dimensional moiré fringes.
  • the CMOS pixel unit is in the undersampling mode in the low resolution mode, and the moire fringes caused by the aliasing are coarse.
  • ⁇ causes the density of the moire fringes to be in the same spatial period as the density of the fingerprint, the recognition of the fingerprint is greatly affected.
  • the Moire fringe may have a phase shift along with the displacement of the optical module and the change of the optical path, and may also affect the fingerprint recognition rate.
  • the weak displacement of the optical fingerprint recognition module may be caused by temperature, pressure, Acceleration and other factors.
  • the embodiment of the present application proposes a general method for eliminating moiré of a multi-stack optical fingerprint sensor, and eliminates moire fringes without affecting the fingerprint image.
  • the terminal device involved in the embodiments of the present application may be a computer, a mobile phone, a tablet, a computer with wireless transceiver function, a virtual reality (VR) terminal device, and augmented reality ( Augmented reality, AR) terminal equipment, wireless terminals in industrial control, wireless terminals in transport safety, and the like.
  • VR virtual reality
  • AR Augmented reality
  • the apparatus for performing the method 200 includes a photosensor array that can include a plurality of photosensor groups.
  • each photosensor group may include an equal number of photosensors.
  • the photosensor array is divided into a plurality of photosensor groups, that is, a thick wire frame as shown in FIG. 2, and each photosensor group may include the same number of photosensors.
  • Each photoelectric sensor group includes four photoelectric sensors as an example, that is, corresponding to four numbered thin wire frames included in each thick wire frame in FIG.
  • At least one photosensor may be determined as a target photosensor in an out-of-order manner in each photosensor group according to a certain preset rule, so that the plurality of photosensor groups The relative position and/or number of target photosensors of at least two photosensor groups are different, wherein the relative position indicates the relative position of the photosensor group in which the target photosensor is located. And acquiring image data outputted by all the target photosensors of the plurality of photosensor groups, breaking the law of spatial periodic sampling, and obtaining an image for fingerprint recognition according to the image data, for example, the image may be a fingerprint image, and the acquiring The fingerprint image can be used.
  • the pixels of the obtained image have a corresponding relationship with the image data output by the target photosensor of the photosensor group, so that spatially periodic sampling can be used to break the spatial periodicity in the low resolution mode of the existing photosensor array.
  • the sampling law can eliminate the moire fringe interference, and can also eliminate the moire fringe interference caused by temperature drift.
  • the out-of-sequence sampling using the low resolution mode also solves the high-resolution image when doing digital image processing. The problem of consuming more hardware resources and power consumption.
  • each photosensor group at least one photosensor is determined to be a target photosensor in an out-of-order manner, wherein the preset rule may be a random selection, that is, for any one of the photoelectric sensor arrays.
  • the sensor group randomly selects at least one photosensor among all photosensors included therein as at least one target photosensor of the photosensor group.
  • the preset rule may also be randomly selected if a certain condition is met, and the embodiment of the present application is not limited thereto.
  • the preset condition includes the same number of target photosensors randomly selected by each photosensor group, that is, each photosensor in a plurality of photosensor groups randomly A predetermined number of photosensors are selected as the target photosensors, and the relative positions of the target photosensors of the at least two photosensor groups in the plurality of photosensor groups are different.
  • each photosensor group includes four photosensors, and one photosensor can be selected as a target photosensor in each photosensor group, and the random selection satisfies at least two of the plurality of photosensor groups.
  • the position of the target photosensor of the photosensor group is different.
  • the random selection may be different for the relative positions of the target photosensors of any two adjacent photosensor groups including horizontal and vertical. Adjacent. As shown in FIG. 6, taking the first photosensor group in the first row as an example, the first photosensor group in the first row determines the first photosensor as the target photosensor, and the first row is the first one.
  • the photosensor group of the photoelectric sensor group is adjacent to the photoelectric sensor group of the first row, and the first photosensor of the first photoelectric sensor group of the first row and the first photoelectric sensor group of the first row
  • the relative positions of the target photosensors are the same, so that a photoelectric sensor other than the first photosensor can be selected in the second photosensor group of the first row, for example, the first row and the second photosensor group are shown in FIG.
  • the target photosensor is a fourth photosensor that is different from the relative position of the target photosensor of the first photosensor group of the first row; similarly, vertically adjacent to the first photosensor group of the first row
  • the photoelectric sensor group is the first photoelectric sensor group of the second row, and the first photoelectric sensor of the first photoelectric sensor group of the second row is also the first photoelectric transmission with the first row
  • the relative positions of the target photosensors of the group are the same, so that photoelectric sensors other than the first photosensor can be selected in the first photoelectric sensor group of the second row, for example, as shown in FIG. 6, the second row is the first
  • the target photosensor of the photosensor group is the second photosensor, which also satisfies the position of the target photosensor of the first photosensor group of the first row.
  • each photosensor group includes n photosensors, n takes an integer greater than 2, and more than one and less than n photosensors are selected as target photosensors in each photosensor group, and each The number of the target photosensors of the photosensor group is the same, and the random selection also satisfies the different relative positions of the target photosensors in which the at least two photosensor groups are present in the plurality of photosensor groups.
  • n takes an integer greater than 2
  • n photosensors are selected as target photosensors in each photosensor group
  • each The number of the target photosensors of the photosensor group is the same, and the random selection also satisfies the different relative positions of the target photosensors in which the at least two photosensor groups are present in the plurality of photosensor groups.
  • Each photosensor group includes four photosensors as an example, and two photosensors are selected in each photosensor group.
  • the relative positions of the target photosensors of the two photosensor groups are different: the relative positions of one or two target photosensors in one of the two photosensor groups are different from those in the other group.
  • the relative positions of the target photosensors of the two photosensor groups are different: the relative positions of one or two target photosensors in one of the two photosensor groups are different from those in the other group.
  • it may be referred to as a first photosensor group and a second photosensor group, assuming four photosensors included in the first photosensor group.
  • the number of target photosensors randomly selected by each photosensor group may also be different, that is, randomly in each of the plurality of photosensor groups.
  • An arbitrary number of photosensors are selected as the target photosensors, that is, the number of target photosensors in which at least two photosensor groups are present among the plurality of photosensor groups is different.
  • any two photosensor groups of the plurality of photosensor groups may be the same at the same position of one or more target photosensors, or the relative position of the target photosensor may be the same; if any two photosensor groups include target photosensors The number of the photosensors included in the two photosensor groups may be different or the same.
  • the photosensor array shown in FIG. 2 is still taken as an example.
  • Each photosensor group includes four photosensors, but the number of target photosensors determined by each photosensor group is different.
  • it may be referred to as a first photosensor group and a second photosensor group, when the number of target photosensors determined by the first photosensor group and the second photosensor group is different.
  • the first photosensor group determines that the first and second photosensors are target photosensors, and the second photosensor group determines only one photosensor, then for the second photosensor group, the first photosensor can be determined
  • the photoelectric sensor of the same position of the target photoelectric sensor in the group that is, the first photoelectric sensor or the second photoelectric sensor is determined as the target photoelectric sensor; or, the target photoelectric sensor in the first photoelectric sensor group may be determined.
  • the photoelectric sensors having different relative positions are determined to determine that the third or fourth photoelectric sensor in the second photoelectric sensor group is the target photoelectric sensor.
  • the relative positions of the target photosensors of the sensor group and the second photosensor group may be the same or different. For example, assuming that both the first photosensor group and the second photosensor group comprise two target photosensors, and the target photosensors of the first photosensor group are the first and second photosensors, then the second photosensor group
  • the target photosensor can be any two of the four photosensors.
  • the number of target photosensors of any two adjacent photosensor groups may be different. Further, the relative positions of the target photosensors of any two adjacent photosensor groups may be Also different, wherein the adjacent two photosensor groups may include laterally adjacent and vertically adjacent.
  • image data outputted by each target photosensor is acquired according to at least one photosensor target photosensor of each photosensor group in the determined photosensor array, and an image is acquired according to the image data, wherein the image
  • Each of the pixels corresponds to a plurality of photosensor groups in the photosensor array, that is, any one pixel of the image corresponds to one of the plurality of photosensor groups, and the pixel is output according to the target photosensor in the photosensor group.
  • the image data is determined.
  • FIG. 7 shows images obtained in the high resolution mode, the low resolution mode, and the out-of-sequence sampling mode, respectively, as shown in FIG. 7, and the left figure shows the high resolution using the prior art.
  • the image obtained by the photosensor array in the rate mode has no moire fringes in the image; for the image obtained by using the photosensor array in the low resolution mode in the prior art, the image has obvious moiré in the image.
  • the out-of-image sampling mode that is, using the image acquisition method of the embodiment of the present application, the target photosensors are randomly determined in the photosensor array, and images are acquired by using the target photosensors, and the images do not exist in the image.
  • the image acquisition method of the embodiment of the present application can eliminate the moire fringe interference, and can also eliminate the moire fringe interference caused by the temperature drift, and additionally, the out-of-sequence sampling using the lower resolution mode. It also solves the problem that high-resolution images consume more hardware resources and power consumption when doing digital image processing.
  • FIG. 8 shows a fingerprint image obtained in the high resolution mode and the out-of-sequence sampling mode, as shown in FIG. 8, the fingerprint image obtained in comparison with the high-resolution mode on the left side, and the right side is according to the embodiment of the present application.
  • the fingerprint image obtained by the image acquisition method has been able to eliminate the influence of the moire fringe and obtain a clear fingerprint image. Therefore, the out-of-sequence sampling using the lower resolution mode can also solve the problem of eliminating the moire fringe interference.
  • High-resolution images consume more hardware resources and power consumption when doing digital image processing.
  • the photosensor array is divided into a plurality of photosensor groups including a plurality of photosensors, and at least one target photosensor is determined out of order in each photosensor group, through which the photosensor is
  • the target photosensor in the array outputs image data, so that spatially non-periodic sampling can break the law of periodic periodic sampling in the low resolution mode of the existing photosensor array, and can eliminate the moire fringe interference. It can eliminate the moire fringe interference caused by temperature drift.
  • out-of-order sampling with low resolution mode also solves the problem that high-resolution images consume more hardware resources and power consumption when performing digital image processing.
  • the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not be applied to the embodiment of the present application.
  • the implementation process constitutes any limitation.
  • FIG. 9 is a schematic block diagram of an image obtaining apparatus according to an embodiment of the present application, which may be a terminal device or located in a terminal device, and specifically, the terminal device may include an optical fingerprint recognition module, the image The acquiring device may be an optical fingerprinting module in the terminal device, and the fingerprint image may be acquired by the optical fingerprinting module. Alternatively, the image acquiring device may be used in other devices in the terminal device, such as imaging or shooting, for Get other images. As shown in FIG. 9, the image obtaining apparatus 300 according to an embodiment of the present application includes: a determining unit 310 and an obtaining unit 320.
  • the determining unit 310 is configured to: in each of the plurality of photosensor groups included in the photosensor array, determine at least one target photosensor out of order, and at least two of the plurality of photosensor groups exist The relative position and/or the number of the target photosensors of the sensor group are different, the relative position is the position of the target photosensor relative to the photosensor group in which it is located; the obtaining unit 320 is configured to: according to the at least the photosensor group Image data acquired by a target photoelectric sensor to acquire an image.
  • the determining unit 310 is specifically configured to: randomly determine the at least one target photosensor in each of the photosensor groups.
  • each photosensor group includes the same number of photosensors.
  • each of the photosensor groups includes four photosensors.
  • the determining unit 310 is specifically configured to: determine one target photosensor in each photosensor group, or determine two target photosensors in each photosensor group.
  • the image obtaining apparatus 300 may correspond to the method 200 in the embodiment of the present application, and the above and other operations and/or functions of the respective units in the apparatus 300 are respectively implemented in order to implement FIGS. 1 to 8 .
  • the corresponding processes of each method in the following are not repeated here for brevity.
  • the image acquiring apparatus of the embodiment of the present application divides the photosensor array into a plurality of photosensor groups including a plurality of photosensors, and sequentially determines at least one target photosensor in each photosensor group, through which the photosensor is
  • the target photosensor in the array outputs image data, so that spatially non-periodic sampling can break the law of periodic periodic sampling in the low resolution mode of the existing photosensor array, and can eliminate the moire fringe interference. It can eliminate the moire fringe interference caused by temperature drift.
  • out-of-order sampling with low resolution mode also solves the problem that high-resolution images consume more hardware resources and power consumption when performing digital image processing.
  • FIG. 10 shows a schematic block diagram of an image acquisition device 400 according to an embodiment of the present application.
  • the device 400 includes a processor 410 and a transceiver 420.
  • the processor 410 is connected to the transceiver 420, and is optional.
  • the device 400 also includes a memory 430 that is coupled to the processor 410.
  • the processor 410, the memory 430, and the transceiver 420 communicate with each other through internal connection paths, and the data signals are transmitted and/or controlled.
  • the memory 430 can be used to store instructions, and the processor 410 is configured to execute the storage of the memory 430.
  • the processor 410 is configured to: in each of the plurality of photosensor groups included in the photosensor array, determine at least one target photosensor out of order, wherein The relative position and/or the number of the target photosensors of the at least two photosensor groups in the plurality of photosensor groups are different, the relative position being the position of the target photosensor relative to the photosensor group in which it is located; according to each photosensor The image data collected by the at least one target photoelectric sensor of the group acquires an image.
  • the processor 410 is configured to randomly determine the at least one target photosensor in each of the photosensor groups.
  • each of the photosensor groups includes the same number of photosensors.
  • each of the photosensor groups includes four photosensors.
  • the processor 410 is configured to: determine a target photosensor in each of the photosensor groups, or determine two target photosensors in each of the photosensor groups.
  • the image obtaining device 400 may correspond to the image acquiring device 300 in the embodiment of the present application, and may correspond to executing the corresponding body in the method 200 according to the embodiment of the present application, and in the device 400
  • the above and other operations and/or functions of the respective units are respectively omitted in order to implement the corresponding processes in the respective methods in FIG. 1 to FIG. 8 for brevity.
  • the image acquisition device of the embodiment of the present application divides the photosensor array into a plurality of photosensor groups including a plurality of photosensors, and determines at least one target photosensor in an out-of-order manner in each photosensor group, through which the photosensor is
  • the target photosensor in the array outputs image data, so that spatially non-periodic sampling can break the law of periodic periodic sampling in the low resolution mode of the existing photosensor array, and can eliminate the moire fringe interference. It can eliminate the moire fringe interference caused by temperature drift.
  • out-of-order sampling with low resolution mode also solves the problem that high-resolution images consume more hardware resources and power consumption when performing digital image processing.
  • the above method embodiments of the present application may be applied to a processor or implemented by a processor.
  • the processor may be an integrated circuit chip with signal processing capabilities.
  • each step of the foregoing method embodiment may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software.
  • the above processor may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or the like.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • Programming logic devices, discrete gates or transistor logic devices, discrete hardware components The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method.
  • the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read only memory (ROMM), an erasable programmable read only memory (erasable PROM, EPROM), or an electrical Erase programmable EPROM (EEPROM) or flash memory.
  • the volatile memory can be a random access memory (RAM) that acts as an external cache.
  • RAM random access memory
  • RAM random access memory
  • many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (Synchronous DRAM).
  • SDRAM double data rate synchronous DRAM
  • DDR SDRAM double data rate synchronous DRAM
  • ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM synchronously connected dynamic random access memory
  • DR RAM direct memory bus random access memory
  • FIG. 11 shows a schematic flow diagram of an image acquisition method 500, which may be performed by an image acquisition device, including a light source, an out-of-order spatial encoding plate, and a photosensor array, in accordance with an embodiment of the present application.
  • the device may be a terminal device, or the device is located in the terminal device.
  • the device may be used to obtain a fingerprint image, that is, the device may be an optical fingerprint recognition module included in the terminal device, which may be The optical fingerprinting module performs the method 500, and in particular, can be performed by a multi-layer optical fingerprinting module as shown in FIG.
  • the method 500 includes: S510, the light emitted by the light source is reflected by the object to be tested to the out-of-order spatial coding board; and S520, the out-of-order space coding plate passes through the out-of-order spatial coding board.
  • the light spots are arranged in a random order in space; S530, the image data of the object to be tested is acquired according to the light spot by the photoelectric sensor array; and S540, according to the image data, the image is acquired.
  • the image obtaining apparatus for performing the method 500 may be a terminal device or located at the terminal device.
  • FIG. 12 shows a schematic block diagram of an image acquisition device 600 according to an embodiment of the present application.
  • the image acquisition device 600 includes a light source 610 for emitting light to an object to be tested.
  • the object to be tested is reflected to the out-of-order space coding board.
  • the light source 610 can be a display screen 101 similar to the optical fingerprint identification module 100 shown in FIG. 1 , and the display screen can be an OLED display screen, and the display screen includes a light-emitting display pixel, which can provide a fingerprint detection process.
  • the light source that is, the light emitted by the light-emitting display pixels of the display screen illuminates the object to be detected, that is, the finger, and is reflected by the finger to be detected.
  • the image acquiring apparatus 600 further includes an out-of-order spatial encoding board 620.
  • the light emitted by the light source 610 is reflected back to the out-of-order spatial encoding board 620 by the object to be tested, and the out-of-order spatial encoding board 620, the reflected light passing through the out-of-order spatial coding board is spatially arranged in an out-of-order manner.
  • the out-of-order spatial coding board 620 may include a light-transmissive area and an opaque area that are unevenly distributed.
  • the light region can transparently reflect the light reflected by the object to be tested, but the opaque region on the out-of-order space coding board 620 blocks the reflected light due to the transparent region of the out-of-order spatial code plate 620 and
  • the distribution of the light-transmitting regions is not uniform, so the light passing through the out-of-order spatial encoding plate 620 is spatially arranged in an out-of-order manner.
  • the light-transmitting area and the opaque area of the out-of-order space coding board 620 are unevenly distributed, and may be continuous or discontinuous. Detailed descriptions of the continuous and discontinuous conditions of the light-transmitting region will be respectively made below.
  • the out-of-order spatial coding board 620 can be a photomask.
  • the photomask includes a partially distributed transparent region and a remaining opaque region, wherein the transparent region can be For transparent media, the opaque area is opaque. Since the opaque regions of the photomask are randomly distributed, as shown in FIG. 13, most of the regions of the light-transmitting regions can be regarded as continuous irregular shapes.
  • the light transmittance of the photomask can be set to 70%-80% in consideration of practical application effects.
  • the image acquisition device 600 may further include an array of periodic prisms.
  • the periodic prism array is located between the light source 610 and the out-of-order spatial coding board 620.
  • the image acquisition device 600 may be an optical fingerprint recognition module 500. That is, similar to the optical fingerprint recognition module shown in FIG. 1, the periodic prism array and the display screen can be connected by an adhesive layer.
  • the periodic prism array includes a uniformly distributed light-transmitting region and an opaque region, and the light-transmitting region is configured to send the light reflected by the object to be detected to the out-of-order spatial encoding plate 620 to the out-of-order spatial encoding plate 620, without being transparent.
  • the area blocks the light reflected by the object to be detected, so that the light of the occlusion portion cannot be transmitted to the out-of-order space coding board 620, and the light passing through the periodic prism array is spatially distributed periodically.
  • the light transmissive area of the out-of-order spatial coding board 620 further transmits the light passing through the transparent region of the periodic prism array to the photosensor array, and the opaque area of the out-of-order spatial coding board 620 blocks the periodic prism.
  • the light in the light transmissive region of the array causes the light passing through the out-of-order spatial encoding plate 620 to become spatially non-periodic.
  • the periodic prism array may be divided into a plurality of prism cells, each prism cell including a light transmissive region and a continuous opaque region, and the relative positions of the light transmissive regions of the plurality of prism cells, The shape and the area are equal, wherein the relative position refers to the position of the light-transmitting region relative to the prism cell in which it is located, that is, the light-transmitting region is spatially periodically distributed, so that the light transmitted through the periodic prism array is also in space. Arrange periodically. Taking FIG. 14 as an example, FIG.
  • each set of prism cells including nine prism cells, wherein the circle of the positive central region of each prism cell is The light-transmissive area of the prism cell is indicated, and the remaining areas are opaque areas, and each circle has the same size.
  • the light transmissive area of each prism cell is a fixed-size circle, and may be other shapes, for example, all squares, or all rectangles, or all other polygons, and the sizes are equal.
  • the light transmission area of each prism cell is located at the center position or at other positions.
  • the light transmission area of each prism cell is a fixed size square, the square may be located in the upper left corner, or other positions.
  • the relative positions of the light-transmitting regions satisfying each prism cell are the same. However, embodiments of the present application are not limited thereto.
  • the light transmissive area in the periodic prism array may be a hole in the periodic prism array, and the hole may be an aperture of any shape, that is, the light transmission area is an air medium; or, in the periodic prism array
  • the light transmissive area may also be other transparent media such as glass or resin.
  • the transparent area of the out-of-order space coding board 620 is discontinuous, that is, the transparent areas are obviously distributed as independent areas.
  • the out-of-order spatial coding board 620 can be divided into a plurality of coding cells, each coding cell includes a transparent area and an opaque area, and at least two coding cells exist in the plurality of coding cells.
  • the light-transmitting region satisfies a preset condition, where the preset condition includes at least one of a relative position, an area, and a shape of the light-transmitting region of the at least two coded cells, wherein the relative position represents a code of the light-transmitting region relative to the coded region The location of the cell.
  • out-of-order spatial encoding board 620 can replace the periodic prism array in the optical fingerprinting module as shown in FIG. 1 such that the light passing through the out-of-order spatial encoding board 620 spatially exhibits a non-periodic arrangement.
  • FIG. 15 shows four groups of coding cells in the out-of-order spatial coding board 620.
  • Each group of coding cells includes nine coding cells, wherein each coding cell includes a light-transmitting region.
  • an opaque area for example, a circle in each coded cell in FIG. 15 indicates a light-transmitting area of the coded cell, and the remaining area is an opaque area.
  • the light-transmitting regions in each of the coded cells are all circular, or the light-transmitting region of each coded cell of the out-of-order spatial code plate 620 may be other shapes.
  • a square, or a rectangle, or other regular or irregular polygons and the shapes of the light-transmitting regions of different coded cells may be different, for example, the light-transmissive regions of the partially coded cells are circular and partially square, but the present application The embodiment is not limited to this.
  • the area of the light-transmitting area in each coded cell in FIG. 15 is equal, or the area of the light-transmitting area of different coded cells may be different, for example, the light-transmitting area of each coded cell
  • the shapes are all circular, and the radii of the light-transmissive regions of different coded cells may be different; for example, the shapes of the light-transmissive regions of different coded cells are different, and the areas of different shapes are also different.
  • the relative positions of the light-transmitting regions in each of the coded cells in FIG. 15 are different.
  • the relative positions of the light-transmitting regions of each coded cell may be randomly determined. Specifically, if the shape and the area of the light-transmitting area of each coding cell are equal, the relative position of the light-transmitting area of at least two coded cells exists in the out-of-order space coding board 620 when the relative position is randomly determined.
  • the light-transmitting regions of any two adjacent coded cells may be different, wherein the adjacent may include laterally adjacent and vertically adjacent. As shown in FIG.
  • the light transmission area is close to the upper left corner, and the light transmission area of the second coding cell of the first row laterally adjacent to the coding cell is Near the upper right corner, the light transmissive area of the first coding cell of the first row satisfies the relative position; likewise, for the second coding unit of the second row vertically adjacent to the first coding cell of the first row The light transmission area is close to the lower left corner, and the light transmission area of the first coded cell in the first row also satisfies the relative position.
  • the transparent area in the out-of-order space coding board 620 may be a hole in the out-of-order space coding board 620, and the out-of-order space coding board 620 is a hollow structure, that is, the light transmission area is an air medium;
  • the light transmissive area may also be other transparent medium such as glass or resin.
  • a photomask may be further included between the out-of-order spatial encoding board 620 and the photosensor.
  • the photomask may be a photomask as shown in FIG. 13, and the photomask includes a light-transmissive region and an opaque region are distributed unevenly, and the light-transmitting region of the photomask can transmit light passing through the light-transmitting region of the disordered spatial code plate to the photosensor array, and the photomask is not
  • the light-transmitting region can block the light passing through the light-transmitting region of the disordered space code plate.
  • the light-transmitting region can be a transparent medium, and the non-light-transmitting region is an opaque material. The embodiment of the present application is not limited thereto.
  • the light passing through the out-of-order spatial coding board 620 is spatially arranged in an out-of-order manner to eliminate moiré, and the photosensor array 640 senses the out-of-order light, thereby outputting image data according to the image.
  • the data acquisition image for example, the image may be a fingerprint image, which may be used for fingerprint recognition.
  • FIG. 16 shows a schematic block diagram of an image acquisition device 700 according to another embodiment of the present application.
  • the image acquisition device 700 can also be used to perform the method 500, for example, the device.
  • the device. 700 can be a terminal device or located at the terminal device.
  • the apparatus 700 can include a light source 710, a periodic prism array 720, an out-of-order spatial encoding plate 730, and a photosensor array 740.
  • the device 700 includes a light source 710 for providing a light source for acquiring an image of an object to be detected, the object to be detected being capable of reflecting light emitted by the light source 710; the periodic prism array 720 is located under the light source 710 Above the out-of-order space coding board 730, the periodic prism array 720 includes a light-transmitting area and an opaque area, and the light-transmissive area can transmit the light reflected by the object to be detected to the out-of-order spatial code board 730.
  • the opaque region is capable of blocking light reflected by the object to be detected, and the light passing through the periodic prism array 720 is spatially evenly distributed;
  • the out-of-order spatial encoding plate 730 is located under the periodic prism array 720, and the photoelectric Above the sensor array 740, the out-of-order spatial encoding plate 730 is configured to transmit to the photosensor array 740 after the received light passing through the periodic prism array 720 is redirected, and is refracted by the out-of-order spatial encoding plate 730.
  • the light is spatially unevenly distributed; the photosensor array 740 is configured to receive and process light refracted by the out-of-order spatial encoding plate 730 to obtain the image data, An image can be acquired based on the image data.
  • the device 700 includes a light source 710, optionally, a display screen 101 similar to the optical fingerprint recognition module 100 shown in FIG. 1 , and the display screen may be an OLED display screen, and the display screen includes a light emitting
  • the display pixel can provide a light source for the fingerprint detection process, and the light emitted by the light-emitting display pixel of the display screen illuminates the finger to be detected and is reflected by the finger to be detected.
  • the periodic prism array 720 of the device 700 is located between the light source 710 and the out-of-order spatial coding board 730, specifically, a periodic prism array similar to the optical fingerprint recognition module shown in FIG. 103.
  • the periodic prism array and the display screen may be connected by an adhesive layer.
  • the periodic prism array 720 includes a uniformly distributed light-transmitting area for transmitting light reflected by the object to be detected, and an opaque area for reflecting the object to be detected. The light and the light passing through the periodic prism array 720 are spatially distributed periodically.
  • the periodic prism array 720 can be divided into a plurality of prism cells, each prism cell including a light transmissive region and a continuous opaque region, and the relative positions of the light transmissive regions of the plurality of prism cells The shape and the area are equal, wherein the relative position refers to the position of the light-transmitting region relative to the prism cell in which it is located, that is, the light-transmitting region is spatially periodically distributed, so that the light transmitted through the periodic prism array 720 is also Arrange periodically in space.
  • FIG. 14 shows a periodic prism array 720.
  • FIG. 14 shows four sets of prism cells in the periodic prism array 720, each set of prism cells including nine prisms.
  • the light-transmissive area of each prism cell is a fixed-size circle, and may be other shapes, for example, may be square, or all rectangles, or all other polygons, and the sizes are equal.
  • the light transmission area of each prism cell is located at the center position or at other positions.
  • each prism cell is a fixed size square, the square may be located in the upper left corner, or other positions.
  • the relative positions of the light-transmitting regions satisfying each prism cell are the same.
  • embodiments of the present application are not limited thereto.
  • the light transmissive area in the periodic prism array may be a hole in the periodic prism array, and the hole may be an aperture of any shape, that is, the light transmission area is an air medium; or, in the periodic prism array
  • the light transmissive area may also be other transparent media such as glass or resin.
  • the light passing through the light-transmitting region of the periodic prism array 720 is spatially distributed periodically, and the periodically distributed light is further irradiated onto the out-of-order spatial encoding plate 730.
  • Plate 730 can change the direction of the periodically distributed light and then be transmitted to photosensor array 740.
  • the out-of-order spatial encoding plate 730 may be a light transmissive material, and the light transmission direction is changed by different thicknesses at different positions, so that the light passing through the out-of-order spatial encoding plate 730 is refracted.
  • the scrambled space code plate 730 may be made of glass material, resin material or the like.
  • the out-of-order spatial coding board 730 can be divided into a plurality of coding cells having the same shape and area, and the plurality of coding cells are in one-to-one correspondence with the plurality of prism cells included in the periodic prism array 720, and the plurality of Each of the coding cells includes a concave portion, and at least one of a relative position, an area, and a shape of the concave portion of the plurality of coding cells having at least two coding cells is different, wherein the relative position is a concave portion Relative to the location of the encoding cell in which it is located.
  • the coded cell is used to change the direction of the light transmitted through the light-transmitting region of the corresponding prism cell, that is, The coding cell refracts light passing through the coded cell by including the recessed portion.
  • FIG. 17 the diagram on the left side of FIG. 17 shows an arbitrary set of coding cells in the out-of-order spatial coding board 730, the set of coding cells including 9 coding cells, wherein each coding cell includes A recessed portion, such as any one of the coded cells shown on the right side of Fig. 17, the square recessed portion of the lower left corner of the coded cell represents the recessed portion of the coded cell.
  • the concave portion in each coding cell is a square, or the concave portion of each coding cell of the out-of-order spatial coding board 730 may be other shapes, such as a circle. , or a ring, or a rectangle, or other regular or irregular polygons, and the shape of the concave portion of the different coding cells may also be different, for example, the concave portion of the partially coded cell is circular and the portion is square, but the present application The embodiment is not limited to this.
  • the recessed portions in each coded cell in FIG. 17 are all continuous regions, or the recessed portion of each coded cell of the out-of-order spatial code plate 730 may further include a plurality of non-contiguous small region.
  • the concave portion of any one of the coding cells of the out-of-order space coding board 730 is a discontinuous area, the concave portion may include a plurality of irregular or regular shapes randomly distributed on the coding unit.
  • the area of the concave portion in each coding cell in FIG. 17 is equal in size, or the area of the concave portion of different coding cells may be different.
  • the shape of the concave portion of each coding cell is Squares, the lengths of the recessed portions of different coded cells may be different; for example, when the shapes of the depressed portions of different coded cells are different, the areas of different shapes may be different.
  • the depths of the recessed portions in each of the coded cells in FIG. 17 are equal, or the depths of the recessed portions of each of the coded cells of the out-of-order spatial code plate 730 may not be equal.
  • the depths of the recessed portions of the different coded cells may be different, and the depths of the different positions of the recessed portions of the same coded cell may also be different.
  • the relative positions of the recessed portions in each of the coded cells in FIG. 17 are different, and for example, the relative positions of the recessed portions of each of the coded cells may be randomly determined. Specifically, if the shape and the area of the concave portion of each coding cell are equal, when the relative position is randomly determined, the relative positions of the concave portions of the at least two coding cells in the out-of-order spatial coding board 730 are different. Further, considering the out-of-order effect, the difference in the recessed portions of any two adjacent coded cells may be made, wherein the neighbors may include laterally adjacent and vertically adjacent. As shown in the left diagram of FIG.
  • the concave portion is in the upper left corner, and the concave portion of the second coding cell of the first row laterally adjacent to the coding cell Then in the lower left corner, the concave portion of the first coding cell of the first row satisfies the relative position; likewise, for the second coding unit that is vertically adjacent to the first coding cell of the first row
  • the recessed portion is also in the lower left corner, and the recessed portion of the first coded cell in the first row also satisfies the relative position.
  • the light passing through the out-of-order space coding board 730 is refracted and spatially arranged in an out-of-order manner, and the photosensor array 740 senses the out-of-order light, thereby outputting image data, and acquiring the image data according to the image data.
  • the image for example, may be a fingerprint image that can be fingerprinted such that moiré on the image can be eliminated.
  • the image acquisition method and apparatus of the embodiment of the present invention can perform the out-of-order arrangement of the light reflected by the object to be detected to the photosensor array through the out-of-order spatial coding board in the image acquisition device, so that the photoelectric sensor array is processed.
  • the image can eliminate the moire fringe.
  • the device is an optical fingerprint module
  • the thickness of the entire optical fingerprint module can be increased or decreased, which is beneficial to the design of the ultra-thin optical fingerprint sensor module.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program code. .

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Abstract

Les modes de réalisation de la présente invention concernent un procédé et un appareil d'acquisition d'images. Le procédé comporte les étapes consistant à: déterminer, dans le désordre et dans chaque groupe de capteurs photoélectriques parmi des groupes multiples de capteurs photoélectriques compris dans un réseau de capteurs photoélectriques, au moins un capteur photoélectrique cible, les positions relatives et/ou les nombres des capteurs photoélectriques cibles dans au moins deux groupes de capteurs photoélectriques parmi les groupes multiples de capteurs photoélectriques étant différents; et acquérir une image d'après des données d'image recueillies par le ou les capteurs photoélectriques cibles dans chaque groupe de capteurs photoélectriques. Le procédé et l'appareil d'acquisition d'images selon les modes de réalisation de la présente invention peuvent éliminer les franges de Moiré.
PCT/CN2018/076437 2018-02-12 2018-02-12 Procédé et appareil d'acquisition d'images WO2019153327A1 (fr)

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CN201880000178.2A CN108323208A (zh) 2018-02-12 2018-02-12 图像获取方法和装置
PCT/CN2018/076437 WO2019153327A1 (fr) 2018-02-12 2018-02-12 Procédé et appareil d'acquisition d'images

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