WO2021103427A1 - 图像扫描系统 - Google Patents

图像扫描系统 Download PDF

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Publication number
WO2021103427A1
WO2021103427A1 PCT/CN2020/089675 CN2020089675W WO2021103427A1 WO 2021103427 A1 WO2021103427 A1 WO 2021103427A1 CN 2020089675 W CN2020089675 W CN 2020089675W WO 2021103427 A1 WO2021103427 A1 WO 2021103427A1
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WO
WIPO (PCT)
Prior art keywords
photoelectric conversion
scanning
scanning system
lenses
image scanning
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PCT/CN2020/089675
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English (en)
French (fr)
Inventor
姜利
戚务昌
王培晓
祁秀梅
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威海华菱光电股份有限公司
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Publication of WO2021103427A1 publication Critical patent/WO2021103427A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/45—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from two or more image sensors being of different type or operating in different modes, e.g. with a CMOS sensor for moving images in combination with a charge-coupled device [CCD] for still images
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/90—Arrangement of cameras or camera modules, e.g. multiple cameras in TV studios or sports stadiums

Definitions

  • the present disclosure relates to sensor technology, and in particular, to an image scanning system.
  • FIG. 1 it is a schematic diagram of a simplified structure of an existing industrial camera, which is composed of a frame body 1, a lens 2, a circuit board 4, and an area array photoelectric conversion chip 3 on the circuit board 4.
  • the length of the lens 2 in the main scanning direction is d
  • the length of the area photoelectric conversion chip 3 in the main scanning direction is y'.
  • the scanning system consists of 4 existing industrial cameras, and the 4 cameras are arranged closely and seamlessly. But because each camera has its own size, there will be a certain distance between the lenses of the 4 cameras.
  • the distance between the shots is s.
  • the scanning length range y1 corresponding to the original scanning by the camera is y1.
  • the scanning length range y1 corresponding to the original scanning by the camera should be at least greater than or equal to the camera length L.
  • the data processing system may not have time to process the huge data of multiple cameras, which is prone to data blockage and data loss.
  • data transmission and reception will increase the output channel and receiving software and hardware due to the increase in the number of cameras, and increase the cost of the scanning system.
  • the light source cannot be as close as the lens of the camera, which may cause the scanning system to fail to scan at a specific angle. Therefore, there is an urgent need to develop a long-length high-resolution high-speed scanning imaging system, and the light source can be as close as possible to the lens to achieve large-angle scanning.
  • the main purpose of the present disclosure is to provide an image scanning system to solve the problem of low resolution of the image scanning system in the prior art when seamless scanning is realized.
  • an image scanning system including a scanning unit, the scanning unit including: a plurality of lenses arranged in sequence along a scanning direction, and the scanning direction is The length direction of the target object; a plurality of photoelectric conversion chips, the photoelectric conversion chip and the lens are arranged in a predetermined direction at a relative interval and one-to-one correspondence, any two adjacent imaging areas of the scanning unit are at least connected,
  • the predetermined direction is an extension direction of the optical axis of the plurality of lenses.
  • the projection of the photoelectric conversion chip on a predetermined plane is inside corresponding to the projection of the lens on a predetermined plane, and the predetermined plane is perpendicular to the predetermined direction and parallel to the scanning direction.
  • the distances between any two photoelectric conversion chips and the corresponding lens are equal.
  • a line connecting the optical centers of any two adjacent lenses is parallel to the predetermined plane, and a line connecting the geometric centers of any two adjacent photoelectric conversion chips is parallel to the predetermined plane, And any two adjacent lenses are seamlessly arranged.
  • connection line between the optical centers of any two adjacent lenses is not parallel to the predetermined plane, and the connection line between the optical centers of any two adjacent photoelectric conversion chips is not parallel to the predetermined plane. parallel.
  • any two of the lenses are the same lens, and any two of the photoelectric conversion chips are the same photoelectric conversion chip.
  • the scanning unit further includes a plurality of light sources, the plurality of light sources are arranged at intervals and are located on the side of the lens away from the photoelectric conversion chip, and the projection of the light source on the predetermined plane is located at the The outside of the projection of the lens on the predetermined plane.
  • the scanning unit further includes a frame body having a containing cavity, and a plurality of the lenses and a plurality of the photoelectric conversion chips are all located in the containing cavity.
  • the scanning unit further includes a first circuit board, the first circuit board is located in the accommodating cavity, and a plurality of the photoelectric conversion chips are arranged on the surface of the first circuit board and are located on the Between the first circuit board and the lens, the scanning unit further includes a first interface.
  • the image scanning system further includes a processing unit that includes a second circuit board, a second interface, a third interface, and a control chip, and the second interface, the third interface, and the control chip are located in the On the second circuit board, the scanning unit and the processing unit communicate with the first interface through the second interface.
  • a processing unit that includes a second circuit board, a second interface, a third interface, and a control chip, and the second interface, the third interface, and the control chip are located in the On the second circuit board, the scanning unit and the processing unit communicate with the first interface through the second interface.
  • control chip includes a first control section, a second control section, and a signal processing section.
  • the first control section is used to control the operation of the photoelectric conversion chip
  • the second control section is used to control the operation of the photoelectric conversion chip.
  • the signal processing unit is used to process the electrical signal output by the photoelectric conversion chip.
  • the image scanning system further includes a terminal device, and the processing unit communicates with the terminal device through the third interface.
  • the scanning unit includes a plurality of lenses and a plurality of photoelectric conversion chips, and the imaging regions of any two adjacent photoelectric conversion chips in the scanning direction partially overlap, so that The image scanning system realizes seamless scanning.
  • the distance between any two adjacent lenses that is, the two can be infinitely close in the scanning direction, even touched or partially overlapped, compared to multiple area scan cameras in the prior art.
  • the distance between the photoelectric conversion chip and the lens in the predetermined direction can be small, so there is no need to reduce the magnification of the scanned image, and it can also ensure that the imaging areas of any two adjacent photoelectric conversion chips partially overlap in the scanning direction. That is, the system guarantees a high resolution of scanned images while achieving seamless scanning.
  • Figure 1 shows a schematic structural diagram of an industrial camera in the prior art
  • Figure 2 shows a schematic structural diagram of a scanning system including multiple industrial cameras in the prior art
  • Fig. 3 shows a schematic structural diagram of a scanning unit of an image scanning system according to an embodiment of the present disclosure
  • FIG. 4 shows a schematic structural diagram of a scanning unit of an image scanning system according to another embodiment of the present disclosure
  • FIG. 5 shows a top view of the scanning unit of the image scanning system in FIG. 3;
  • Fig. 6 shows a schematic structural diagram of a processing unit of an image scanning system according to an embodiment of the present disclosure.
  • the present disclosure proposes an image scanning system.
  • FIG. 3 and 4 are schematic structural diagrams of an image scanning system according to an embodiment of the present disclosure.
  • the image scanning system includes a scanning unit, and the above-mentioned scanning unit includes:
  • a plurality of lenses 10, the plurality of lenses 10 are arranged in sequence along a scanning direction, and the scanning direction is the length direction of the target object 100;
  • a plurality of photoelectric conversion chips 20, the photoelectric conversion chips 20 and the lens 10 are arranged at a predetermined distance in a predetermined direction and correspond to each other, any two adjacent imaging areas of the scanning unit are at least connected, and the predetermined directions are multiple The direction in which the optical axis of the lens 10 extends.
  • the scanning unit includes a plurality of lenses and a plurality of photoelectric conversion chips, and the imaging regions of any two adjacent photoelectric conversion chips 20 in the scanning direction are partially overlapped, so that the image scanning system realizes no Seam scan.
  • the distance between any two adjacent lenses that is, the two can be infinitely close in the scanning direction, even touched or partially overlapped, compared to multiple area scan cameras in the prior art.
  • the distance between the photoelectric conversion chip and the lens in the predetermined direction can be small, so there is no need to reduce the magnification of the scanned image, and it can also ensure that the imaging areas of any two adjacent photoelectric conversion chips partially overlap in the scanning direction. That is, the system guarantees a high resolution of scanned images while achieving seamless scanning.
  • any two adjacent photoelectric conversion chips 20 in the scanning direction are connected in the first case.
  • the imaging areas of any two adjacent photoelectric conversion chips in the scanning direction are connected.
  • any two adjacent photoelectric conversion chips are in the scanning direction. There are no gaps between the imaging areas in the scanning direction described above.
  • the projection of the photoelectric conversion chip 20 on a predetermined plane corresponds to the projection of the lens 10 on the predetermined plane, and the predetermined plane is perpendicular to the predetermined direction and Parallel to the above scanning direction.
  • This structure can ensure that the photoelectric conversion chip is arranged near the optical axis of the corresponding lens, thereby facilitating the photoelectric conversion chip to receive the reflected light of the target object through the corresponding lens, and further ensuring the imaging area of any two adjacent photoelectric conversion chips in the scanning direction Partially overlap to achieve seamless scanning.
  • the distances between any two of the photoelectric conversion chips 20 and the corresponding lens 10 are equal, so that the scanning image of each photoelectric conversion chip has the same reduction factor. Therefore, it is ensured that the resolution of the image scanning of each photoelectric conversion chip is the same, which facilitates subsequent integration of the images scanned by each photoelectric conversion chip into a complete image.
  • connection line of the optical centers of any two adjacent lenses 10 is parallel to the predetermined plane, and the geometric shapes of any two adjacent photoelectric conversion chips 20 are
  • the central line is parallel to the above-mentioned predetermined plane, which simplifies the arrangement of the lens and the photoelectric conversion chip, makes the image scanning system simple in structure and convenient for maintenance and replacement, and any two adjacent lenses are seamlessly arranged to achieve seamless In the case of scanning, the resolution of the scanned image is further improved.
  • the magnification of the camera lens is M1 max . Therefore, the image scanning system of the present disclosure improves the scanning resolution while realizing seamless scanning.
  • the line connecting the optical centers of any two adjacent lenses 10 is not parallel to the predetermined plane, and any two adjacent photoelectric conversion chips 20 are not parallel to the predetermined plane.
  • the line of the optical center is not parallel to the above-mentioned predetermined plane.
  • the multiple lenses are arranged closely and staggered along the scanning direction, so that on the basis of achieving seamless scanning, the reduction factor of the scanned image can be further reduced, and the resolution of the image scanning system can be improved.
  • any two of the above-mentioned lenses are the same lens, that is, the parameters such as size, shape, and material are the same, and any two of the above-mentioned photoelectric conversion chips are the same photoelectric conversion chip, that is, the two are exactly the same.
  • Photoelectric conversion chip The same lens and the same photoelectric conversion chip are used for image scanning, so that the resolution of the image scanning of each photoelectric conversion chip is the same, which is convenient for subsequent image processing.
  • a plurality of the aforementioned lenses can also be different lenses
  • a plurality of the aforementioned photoelectric conversion chips can also be different photoelectric conversion chips.
  • those skilled in the art can adjust the lens and the corresponding photoelectric conversion chip according to the actual situation.
  • the distance of the conversion chip makes the resolution of the image scanning of each photoelectric conversion chip the same.
  • the scanning unit further includes a plurality of light sources 40, the light emitted by the light sources 40 is irradiated on the target object 100, and the reflected light of the target object 100 passes through the lens 10.
  • a plurality of the light sources 40 are arranged at intervals and located on the side of the lens 10 away from the photoelectric conversion chip 20, and the projection of the light source 40 on the predetermined plane is located on the lens 10 in the predetermined plane.
  • multiple light sources 40 are provided around the lens 10, and the distance between any two adjacent light sources 40 is equal, so that the light emitted by the multiple light sources 40 uniformly irradiates the target object. 100, so as to ensure that the brightness of each part of the scanned image is the same.
  • the scanning unit further includes a frame body 30, the frame body 30 has an accommodating cavity, and the plurality of lenses 10 and the plurality of photoelectric conversion chips 20 are both Located in the above-mentioned containing cavity.
  • a plurality of the above-mentioned lenses and a plurality of the above-mentioned photoelectric conversion chips are arranged in the accommodating cavity of one frame.
  • one camera corresponds to one frame, which breaks the limitation of the distance between the lenses and further realizes seamless Improve the resolution on the basis of scanning.
  • the light source is arranged in the housing cavity of the frame, and the light source can also be arranged on the surface of the frame or outside the frame without contacting the frame, so as to realize the various light sources.
  • the scanning unit further includes a first circuit board 50, the first circuit board 50 is located in the accommodating cavity, and a plurality of the photoelectric conversion chips 20 are arranged On the surface of the first circuit board 50 and between the first circuit board 50 and the lens 10.
  • a plurality of the photoelectric conversion chips are integrated on a first circuit board, and the scanning unit further includes a first interface 51, and the first interface 51 is electrically connected to the light source 40 and the first circuit board 50 to facilitate the alignment
  • Multiple photoelectric conversion chips and multiple light sources provide uniform power supply, thereby simplifying the structure of the image scanning system.
  • the above-mentioned image scanning system further includes a processing unit.
  • the above-mentioned processing unit includes a second circuit board 60, a second interface 61, a third interface 62, and a control chip 70.
  • the second interface 61, the third interface 62, and the control chip 70 are located on the second circuit board 60, and the scanning unit and the processing unit communicate through the second interface 61 and the first interface 51.
  • the second interface and the first interface may be connected by a cable, so as to realize the communication between the control chip and the processing unit, so that the control chip controls the work of the processing unit and performs processing on the electrical signals output by the processing unit. deal with.
  • the above-mentioned first control unit controls a plurality of photoelectric conversion chips.
  • the above-mentioned second control unit performs the wiring of the light source, so that the light emission of the light source is synchronized with the frame signal and the line signal of the photoelectric conversion chip.
  • the aforementioned control signal processing unit adopts a parallel hardware data processing method, which improves the data processing speed compared to the sequential processing method in which multiple camera data are processed by a computer in the prior art.
  • control chip of the processing unit may be an FPGA chip to meet the data processing needs of multiple high-resolution photoelectric conversion chips.
  • the control chip is not limited to the FPGA chip. The personnel can also choose the appropriate control chip according to the actual situation.
  • the control chip 70 includes a first control section 71, a second control section 72, and a signal processing section 73.
  • the first control section 71 is used to control the photoelectric conversion chip.
  • the second control unit 72 is used to control the operation of the light source, and the signal processing unit 73 is used to process the electrical signal output by the photoelectric conversion chip.
  • the socket is powered on, the second control unit controls the light source to start working, and the first control unit controls the photoelectric conversion chip to work, that is, the image scanning system starts image scanning, and the light emitted by the light source is evenly irradiated on the target object,
  • the photoelectric conversion chip receives the reflected light of the target object through a corresponding lens, and converts the optical signal into an electrical signal.
  • the electrical signal is processed by the signal processing unit to obtain a scanned image of the target object.
  • the above-mentioned image scanning system further includes a terminal device, and the above-mentioned processing unit communicates with the above-mentioned terminal device through the above-mentioned third interface.
  • the third interface communicates with the terminal device through a cable, so as to transmit the scanned image obtained by the processing unit to the terminal device.
  • the subsequent terminal device can also process the scanned image, and the original data or data can be transferred through a single interface.
  • the data processing result is sent to the terminal, reducing the number of channels and the software and hardware costs of data reception.
  • the scanning unit includes a plurality of lenses and a plurality of photoelectric conversion chips, and the imaging regions of any two adjacent photoelectric conversion chips 20 in the scanning direction partially overlap, so that the image scanning system Achieve seamless scanning.
  • the distance between any two adjacent lenses that is, the two can be infinitely close in the scanning direction, even touched or partially overlapped, compared to multiple area scan cameras in the prior art.
  • the distance between the photoelectric conversion chip and the lens in the predetermined direction can be small, so there is no need to reduce the magnification of the scanned image, and it can also ensure that the imaging areas of any two adjacent photoelectric conversion chips partially overlap in the scanning direction. That is, the system guarantees a high resolution of scanned images while achieving seamless scanning.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Facsimile Heads (AREA)
  • Image Input (AREA)
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Abstract

本公开提供了一种图像扫描系统，该图像扫描系统包括扫描单元，扫描单元包括：多个透镜，多个透镜沿扫描方向依次排列，扫描方向为目标物体的长度方向；多个光电转换芯片，光电转换芯片与透镜在预定方向上相对间隔地设置且一一对应，扫描单元的任意两个相邻的成像区域至少连接，预定方向为多个透镜的光轴的延伸方向，从而使得该图像扫描系统实现无缝扫描，且任意两个相邻的透镜之间距离没有限制，相比现有技术中的多个面阵相机，光电转换芯片与透镜在预定方向上的距离可以较小，不需要将扫描图像的放大倍数变小，也可以保证任意两个相邻的光电转换芯片在扫描方向上的成像区域部分重叠，即该系统在实现无缝扫描的同时保证了扫描图像的分辨率较高。

Description

图像扫描系统
本公开以2019年11月29日递交的、申请号为201911204651.1且名称为“图像扫描系统”的专利文件为优先权文件，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及传感器技术，具体而言，涉及一种图像扫描系统。
背景技术
现有面阵相机，无论是CCD相机，还是CMOS相机，无论是卷帘曝光相机还是全局曝光相机，因相机体积较大，不可避免地造成相机成像分辨率的下降。如图1所示，是一个现有工业相机的简略构成示意图，由框体1、透镜2、线路板4及线路板4上的面阵光电转换芯片3构成。其中透镜2在主扫描方向上的长度为d，面阵光电转换芯片3主扫描方向上的长度为y’。我们都知道几乎所有的工业用面阵相机应用都是成一个比原稿缩小的像，本公开中将缩小也描述为放大，缩小比率用放大倍数来表示，只不过这个放大倍数小于1。
如图2所示，扫描系统由4个现有工业相机组成，4个相机间紧密无缝隙排例。但因为各自的相机都有各自的体积，4个相机的镜头间就会有一定的间距。假设镜头间的间距为s。在主扫描方向上，相机长度为L，那么L＝d+s/2+s/2＝d+s。相机扫描对应原稿侧扫描长度范围为y1，为了保证相机在主扫描方向上无缝扫描，相机扫描对应原稿侧扫描长度范围y1至少要大于或者等于相机长度L。面阵相机芯片的长度为y’，在这里为了便于理解，我们认为面阵相机芯片的成像长度即为面阵相机芯片的长度y’，这样相机的放大倍数M1为，M1＝y’/y1。要保证M1大，面阵相机芯片的长度y’固定，只能使y1尽可能小。
为了保证相机在主扫描方向上无缝扫描，相机扫描对应原稿侧扫描长度范围y1至少要大于或者等于相机长度L。所以此时相机的放大倍数只能做到最大为M1 max＝y’/y1＝y’/L＝y’/d+s的放大倍数。只有提高放大倍数，相机分辨率才能越高。但现有长尺相机阵列的放大倍数因为相机自身的体积限制无法提高，因此需要开发能提高相机放大倍数即高分辨率的长尺状相机。同时现有的各个相机的输出传输都是各个相机单独与数据处理系统相连，相机越多，数据处理系统需要处理的数据量就越大。高速扫描时，数据处理系统有可能来不及对多个相机庞大的数据进行处理，容易发生数据阻塞，造成数据丢失。同时数据的传输和接收，会因为相机数量的增加，导致输出通道和接收软硬件的增加，增加扫描系统的成本。同时因为相机的体积及外观限制，光源无法极限接近相机的透镜，这样就可能导致扫描系统无法实现特定角度的扫描。因此急需开发一种长尺状高分辨率高速扫描成像系统，且光源可以与透镜尽量靠近，实现大角度扫描。
在背景技术部分中公开的以上信息只是用来加强对本文所描述技术的背景技术的理解，因此，背景技术中可能包含某些信息，这些信息对于本领域技术人员来说并未形成在本国已知的现有技术。
发明内容
本公开的主要目的在于提供一种图像扫描系统，以解决现有技术中图像扫描系统在实现无缝扫描的情况下分辨率较低的问题。
为了实现上述目的，根据本公开的一个方面，提供了一种图像扫描系统，包括扫描单元，所述扫描单元包括：多个透镜，多个所述透镜沿扫描方向依次排列，所述扫描方向为目标物体的长度方向；多个光电转换芯片，所述光电转换芯片与所述透镜在预定方向上相对间隔地设置且一一对应，所述扫描单元的任意两个相邻的成像区域至少连接，所述预定方向为多个所述透镜的光轴的延伸方向。
可选地，所述光电转换芯片在预定平面上的投影在对应所述透镜在预定平面上的投影的内部，所述预定平面与所述预定方向垂直且与所述扫描方向平行。
可选地，任意两个所述光电转换芯片与对应的所述透镜的距离均相等。
可选地，任意两个相邻的所述透镜的光心的连线与所述预定平面平行，任意两个相邻的所述光电转换芯片的几何中心的连线与所述预定平面平行，且任意两个相邻的所述透镜无缝设置。
可选地，任意两个相邻的所述透镜的光心的连线与所述预定平面不平行，任意两个相邻的所述光电转换芯片的光心的连线与所述预定平面不平行。
可选地，任意两个所述透镜为相同的透镜，任意两个所述光电转换芯片为相同的光电转换芯片。
可选地，所述扫描单元还包括多个光源，多个所述光源间隔设置且位于所述透镜远离所述光电转换芯片的一侧，且所述光源在所述预定平面上的投影位于所述透镜在所述预定平面上的投影的外部。
可选地，所述扫描单元还包括框体，所述框体具有容纳腔，多个所述透镜和多个所述光电转换芯片均位于所述容纳腔内。
可选地，所述扫描单元还包括第一线路板，所述第一线路板位于所述容纳腔内，多个所述光电转换芯片设置在所述第一线路板的表面上且位于所述第一线路板和所述透镜之间，所述扫描单元还包括第一接口。
可选地，所述图像扫描系统还包括处理单元，所述处理单元包括第二线路板、第二接口、第三接口和控制芯片，所述第二接口、第三接口和控制芯片位于所述第二线路板上，所述扫描单元与所述处理单元通过所述第二接口和所述第一接口通信。
可选地，所述控制芯片包括第一控制部、第二控制部和信号处理部，所述第一控制部用于控制所述光电转换芯片的工作，所述第二控制部用于控制所述光源的工作，所述信号处理部用于对所述光电转换芯片输出的电信号进行处理。
可选地，所述图像扫描系统还包括终端设备，所述处理单元通过所述第三接口与所述终端设备通信。
应用本公开的技术方案，上述图像扫描系统中，扫描单元包括多个透镜和多个光电转换芯片，且任意两个相邻的上述光电转换芯片在上述扫描方向上的成像区域部分重叠，从而使得该图像扫描系统实现无缝扫描。并且，该图像扫描系统中，任意两个相邻的透镜之间距离没有限制，即可以将二者在扫描方向上无限靠近甚至接触或者部分重叠，相比现有技术中的多个面阵相机，光电转换芯片与透镜在预定方向上的距离可以较小，所以不需要将扫描图像的放大倍数变小，也可以保证任意两个相邻的光电转换芯片在扫描方向上的成像区域部分重叠，即该系统在实现无缝扫描的同时保证了扫描图像的分辨率较高。
附图说明
构成本公开的一部分的说明书附图用来提供对本公开的进一步理解，本公开的示意性实施例及其说明用于解释本公开，并不构成对本公开的不当限定。在附图中：
图1示出了现有技术中的一种工业相机的结构示意图；
图2示出了现有技术中的一种包括多个工业相机的扫描系统的结构示意图；
图3示出了根据本公开的一种实施例的图像扫描系统的扫描单元的结构示意图；
图4示出了根据本公开的另一种实施例的图像扫描系统的扫描单元的结构示意图；
图5示出了图3中的图像扫描系统的扫描单元的俯视图；以及
图6示出了根据本公开的一种实施例的图像扫描系统的处理单元的结构示意图。
其中，上述附图包括以下附图标记：
1、框体；2、透镜；3、光电转换芯片；4、线路板；10、透镜；20、光电转换芯片；30、框体；40、光源；50、第一线路板；51、第一接口；60、第二线路板；61、第二接口；62、第三接口；70、控制芯片；71、第一控制部；72、第二控制部；73、信号处理部；100、目标物体。
具体实施方式
需要说明的是，在不冲突的情况下，本公开中的实施例及实施例中的特征可以相互组合。下面将参考附图并结合实施例来详细说明本公开。
为了使本技术领域的人员更好地理解本公开方案，下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分的实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本公开保护的范围。
需要说明的是，本公开的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本公开的实施例。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
应该理解的是，当元件(诸如层、膜、区域、或衬底)描述为在另一元件“上”时，该元件可直接在该另一元件上，或者也可存在中间元件。而且，在说明书以及权利要求书中，当描述有元件“连接”至另一元件时，该元件可“直接连接”至该另一元件，或者通过第三元件“连接”至该另一元件。
正如背景技术所介绍的，现有技术中的实现无缝扫描的情况下分辨率较低，为了解决如上的技术问题，本公开提出了一种图像扫描系统。
图3和图4是根据本公开实施例的图像扫描系统的结构示意图，该图像扫描系统包括扫描单元，上述扫描单元包括：
多个透镜10，多个上述透镜10沿扫描方向依次排列，上述扫描方向为目标物体100的长度方向；
多个光电转换芯片20，上述光电转换芯片20与上述透镜10在预定方向上相对间隔地设置且一一对应，上述扫描单元的任意两个相邻的成像区域至少连接，上述预定方向为多个上述透镜10的光轴的延伸方向。
上述图像扫描系统中，扫描单元包括多个透镜和多个光电转换芯片，且任意两个相邻的上述光电转换芯片20在上述扫描方向上的成像区域部分重叠，从而使得该图像扫描系统实现无缝扫描。并且，该图像扫描系统中，任意两个相邻的透镜之间距离没有限制，即可以将二者在扫描方向上无限靠近甚至接触或者部分重叠，相比现有技术中的多个面阵相机，光电转换芯片与透镜在预定方向上的距离可以较小，所以不需要将扫描图像的放大倍数变小，也可以保证任意两个相邻的光电转换芯片在扫描方向上的成像区域部分重叠，即该系统在实现无缝扫描的同时保证了扫描图像的分辨率较高。
需要说明的是，任意两个相邻的上述光电转换芯片20在上述扫描方向上的成像区域至少连接包括两种情况，第一种情况，任意两个相邻的上述光电转换芯片在上述扫描方向上的成 像区域部分重叠，第二种情况，任意两个相邻的上述光电转换芯片在上述扫描方向上的成像区域连接，在这两种情况下，任意两个相邻的上述光电转换芯片在上述扫描方向上的成像区域之间没有缝隙。
在本公开的一种实施例中，如图5所示，上述光电转换芯片20在预定平面上的投影在对应上述透镜10在预定平面上的投影的内部，上述预定平面与上述预定方向垂直且与上述扫描方向平行。该结构可以保证光电转换芯片设置在对应透镜的光轴附近，从而便于光电转换芯片通过对应的透镜接收目标物体的反射光，进一步保证任意两个相邻的光电转换芯片在扫描方向上的成像区域部分重叠，从而实现无缝扫描。
在本公开的一种实施例中，如图3和图4所示，任意两个上述光电转换芯片20与对应的上述透镜10的距离均相等，使得各光电转换芯片的扫描图像的缩小倍数相同，从而保证各光电转换芯片图像扫描的分辨率均相同，便于后续将各光电转换芯片扫描的图像整合为一个完整的图像。
在本公开的一种实施例中，如图3所示，任意两个相邻的上述透镜10的光心的连线与上述预定平面平行，任意两个相邻的上述光电转换芯片20的几何中心的连线与上述预定平面平行，从而简化了透镜和光电转换芯片的排列方式，使得图像扫描系统结构简单，便于维修更换，且任意两个相邻的上述透镜无缝设置，在实现无缝扫描的情况下，进一步提高了扫描图像的分辨率。
具体地，如图3所示，各光电转换芯片的长度均为y’，将各光电转换芯片的成像长度近似为各光电转换芯片的长度y’，因此，各光电转换芯片对应的透镜的放大倍数M2＝y’/y2，为了保证扫描单元在主扫描方向上无缝扫描，上述扫描单元的各相邻的成像区域在扫描方向的长度均为y2，需要y2大于或者等于透镜长度d，因此，透镜的最大放大倍数M2 max＝y’/d。相比现有技术的技术方案，本公开的透镜的最大放大倍数M2 max＝y’/d>M1 max＝y’/d+s，即本公开的透镜的放大倍数M2 max大于现有技术中相机透镜的放大倍数M1 max，因此，本公开的图像扫描系统在实现无缝扫描的情况下提高了扫描分辨率。
在本公开的另一种实施例中，如图4所示，任意两个相邻的上述透镜10的光心的连线与上述预定平面不平行，任意两个相邻的上述光电转换芯片20的光心的连线与上述预定平面不平行。具体地，将多个透镜沿扫描方向紧密错位排列，从而可以在可以实现无缝扫描的基础上，进一步减小扫描图像的缩小倍数，提高图像扫描系统的分辨率。
在本公开的一种实施例中，任意两个上述透镜为相同的透镜，即大小、形状以及材料等参数均相同，任意两个上述光电转换芯片为相同的光电转换芯片，即二者为一模一样的光电转换芯片。采用相同的透镜和相同的光电转换芯片进行图像扫描，使得各光电转换芯片图像扫描的分辨率均相同，便于之后的图像处理。
需要说明的是，多个上述透镜也可以为不同的透镜，多个上述光电转换芯片也可以为不同的光电转换芯片，在这种情况下，本领域技术人员根据实际情况调整透镜与对应的光电转换芯片的距离，使得各光电转换芯片图像扫描的分辨率均相同。
在本公开的一种实施例中，如图3至5所示，上述扫描单元还包括多个光源40，上述光源40发出的光照射在目标物体100上，目标物体100的反射光通过透镜10后被对应的光电转换芯片20接收，多个上述光源40间隔设置且位于上述透镜10远离上述光电转换芯片20的一侧，且上述光源40在上述预定平面上的投影位于上述透镜10在上述预定平面上的投影的外部，以避免光源40阻挡目标物体100的反射光，使得目标物体100的反射光可以毫无阻碍地通过透镜10照射到光电转换芯片20上，这样可以进一步保证扫描结果的准确性。
具体地，如图5所示，上述透镜10的周围设有多个光源40，任意两个相邻的光源40之间的距离均相等，使得多个光源40发出的光均匀地照射在目标物体100上，从而保证扫描图像各部分的亮度相同。
在本公开的一种实施例中，如图3至图5所示，上述扫描单元还包括框体30，上述框体30具有容纳腔，多个上述透镜10和多个上述光电转换芯片20均位于上述容纳腔内。将多个上述透镜和多个上述光电转换芯片设置在一个框体的容纳腔内，相比于现有技术中一个相机对应一个框体，打破了透镜之间的距离限制，进一步在实现无缝扫描的基础上提高分辨率。
需要说明的是，如图3和图4所示，光源设置框体的容纳腔内，光源还可以设置框体的表面上或者设置在框体外部且与框体不接触，从而实现光源的各种角度扫描。
在本公开的一种实施例中，如图3和图4所示，上述扫描单元还包括第一线路板50，上述第一线路板50位于上述容纳腔内，多个上述光电转换芯片20设置在上述第一线路板50的表面上且位于上述第一线路板50和上述透镜10之间。上述结构中，多个上述光电转换芯片集成在第一线路板上，且上述扫描单元还包括第一接口51，上述第一接口51与上述光源40和上述第一线路板50电连接，便于对多个光电转换芯片和多个光源统一供电，从而简化了图像扫描系统的结构。
本公开的一种实施例中，如图6所示，上述图像扫描系统还包括处理单元，上述处理单元包括第二线路板60、第二接口61、第三接口62和控制芯片70，上述第二接口61、第三接口62和控制芯片70位于上述第二线路板60上，上述扫描单元与上述处理单元通过上述第二接口61和上述第一接口51通信。具体地，上述第二接口和上述第一接口之间可以通过电缆连接，从而实现上述控制芯片与上述处理单元通信，使得上述控制芯片控制处理单元的工作，并且对上述处理单元输出的电信号进行处理。
具体地，上述第一控制部对多个光电转化芯片进行控制，相比于现有技术中对各个相机分别控制，减少了处理单元与扫描单元之间的信号线的数量，从而简化了处理单元的布线，上述第二控制部对光源进行，使得光源的发光与光电转换芯片的帧信号和行信号同步，相比于现有技术中的光源常亮点灯方式，更容易控制光源的发光时序和发光光量，上述控制信号处理部采用并行硬件数据处理方式，相比于现有技术中多个相机数据通过电脑的顺序处理方式，提高了数据处理速度。
本公开的一种具体的实施例中，上述处理单元的控制芯片可以为FPGA芯片，以满足多个高分辨率的光电转换芯片的数据处理需要，当然，控制芯片不限于FPGA芯片，本领域技 术人员还可以根据实际情况选择合适的控制芯片。
本公开的一种实施例中，如图6所示，上述控制芯片70包括第一控制部71、第二控制部72和信号处理部73，上述第一控制部71用于控制上述光电转换芯片的工作，上述第二控制部72用于控制上述光源的工作，上述信号处理部73用于对上述光电转换芯片输出的电信号进行处理。
具体地，将上述插座通电，上述第二控制部控制上述光源开始工作，上述第一控制部控制上述光电转换芯片工作，即图像扫描系统开始图像扫描，光源发出的光均匀照射在目标物体上，光电转换芯片通过对应的透镜接收目标物体的反射光，并将光信号转换为电信号，电信号经过信号处理部处理得到目标物体的扫描图像。
本公开的一种实施例中，上述图像扫描系统还包括终端设备，上述处理单元通过上述第三接口与上述终端设备通信。具体地，上述第三接口通过电缆与上述终端设备通信，从而将处理单元得到的扫描图像传输至终端设备中，后续终端设备还可以对扫描图像进行处理，并且通过单个接口就可以将原始数据或者数据处理结果发送给终端，减少了通道数量和数据接收的软硬件成本。
从以上的描述中，可以看出，本公开上述的实施例实现了如下技术效果：
本公开的图像扫描系统中，扫描单元包括多个透镜和多个光电转换芯片，且任意两个相邻的上述光电转换芯片20在上述扫描方向上的成像区域部分重叠，从而使得该图像扫描系统实现无缝扫描。并且，该图像扫描系统中，任意两个相邻的透镜之间距离没有限制，即可以将二者在扫描方向上无限靠近甚至接触或者部分重叠，相比现有技术中的多个面阵相机，光电转换芯片与透镜在预定方向上的距离可以较小，所以不需要将扫描图像的放大倍数变小，也可以保证任意两个相邻的光电转换芯片在扫描方向上的成像区域部分重叠，即该系统在实现无缝扫描的同时保证了扫描图像的分辨率较高。
以上所述仅为本公开的优选实施例而已，并不用于限制本公开，对于本领域的技术人员来说，本公开可以有各种更改和变化。凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (12)

  1. 一种图像扫描系统，其特征在于，包括扫描单元，所述扫描单元包括：
    多个透镜，多个所述透镜沿扫描方向依次排列，所述扫描方向为目标物体的长度方向；
    多个光电转换芯片，所述光电转换芯片与所述透镜在预定方向上相对间隔地设置且一一对应，所述扫描单元的任意两个相邻的成像区域至少连接，所述预定方向为多个所述透镜的光轴的延伸方向。
  2. 根据权利要求1所述的图像扫描系统，其特征在于，所述光电转换芯片在预定平面上的投影在对应所述透镜在预定平面上的投影的内部，所述预定平面与所述预定方向垂直且与所述扫描方向平行。
  3. 根据权利要求2所述的图像扫描系统，其特征在于，任意两个所述光电转换芯片与对应的所述透镜的距离均相等。
  4. 根据权利要求2所述的图像扫描系统，其特征在于，任意两个相邻的所述透镜的光心的连线与所述预定平面平行，任意两个相邻的所述光电转换芯片的几何中心的连线与所述预定平面平行，且任意两个相邻的所述透镜无缝设置。
  5. 根据权利要求3所述的图像扫描系统，其特征在于，任意两个相邻的所述透镜的光心的连线与所述预定平面不平行，任意两个相邻的所述光电转换芯片的光心的连线与所述预定平面不平行。
  6. 根据权利要求3所述的图像扫描系统，其特征在于，任意两个所述透镜为相同的透镜，任意两个所述光电转换芯片为相同的光电转换芯片。
  7. 根据权利要求2所述的图像扫描系统，其特征在于，所述扫描单元还包括多个光源，多个所述光源间隔设置且位于所述透镜远离所述光电转换芯片的一侧，且所述光源在所述预定平面上的投影位于所述透镜在所述预定平面上的投影的外部。
  8. 根据权利要求7所述的图像扫描系统，其特征在于，所述扫描单元还包括框体，所述框体具有容纳腔，多个所述透镜和多个所述光电转换芯片均位于所述容纳腔内。
  9. 根据权利要求8所述的图像扫描系统，其特征在于，所述扫描单元还包括第一线路板，所述第一线路板位于所述容纳腔内，多个所述光电转换芯片设置在所述第一线路板的表面上且位于所述第一线路板和所述透镜之间，所述扫描单元还包括第一接口。
  10. 根据权利要求9所述的图像扫描系统，其特征在于，所述图像扫描系统还包括处理单元，所述处理单元包括第二线路板、第二接口、第三接口和控制芯片，所述第二接口、第三接口和控制芯片位于所述第二线路板上，所述扫描单元与所述处理单元通过所述第二接口和所述第一接口通信。
  11. 根据权利要求10所述的图像扫描系统，其特征在于，所述控制芯片包括第一控制部、第二控制部和信号处理部，所述第一控制部用于控制所述光电转换芯片的工作，所述第二控制部用于控制所述光源的工作，所述信号处理部用于对所述光电转换芯片输出的电信号进行处理。
  12. 根据权利要求10所述的图像扫描系统，其特征在于，所述图像扫描系统还包括终端设备，所述处理单元通过所述第三接口与所述终端设备通信。
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