WO2024098916A1 - 成像装置和成像方法 - Google Patents

成像装置和成像方法 Download PDF

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Publication number
WO2024098916A1
WO2024098916A1 PCT/CN2023/116740 CN2023116740W WO2024098916A1 WO 2024098916 A1 WO2024098916 A1 WO 2024098916A1 CN 2023116740 W CN2023116740 W CN 2023116740W WO 2024098916 A1 WO2024098916 A1 WO 2024098916A1
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Prior art keywords
fill light
aiming
unit
image
brightness
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PCT/CN2023/116740
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English (en)
French (fr)
Inventor
王冬生
姜涛
王祯玺
韩子骞
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无锡盈达聚力科技有限公司
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Publication of WO2024098916A1 publication Critical patent/WO2024098916A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10712—Fixed beam scanning
    • G06K7/10722—Photodetector array or CCD scanning
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K2207/00—Other aspects
    • G06K2207/1011—Aiming

Definitions

  • the present application relates to the field of image acquisition, and in particular to an imaging device and an imaging method.
  • Optical information acquisition based on image scanning includes the acquisition of various machine-readable optical information.
  • Common machine-readable optical information includes one-dimensional codes, two-dimensional codes, OCR graphics, ultraviolet anti-counterfeiting codes, infrared anti-counterfeiting codes, etc.
  • an illumination source is often used to illuminate the optical information to be scanned, and an aiming light source is used to project an aiming light spot to aim at the optical information.
  • the traditional illumination method is that the illumination source is always on, and the brightness of the illumination source is constant.
  • a lighting source with variable brightness is required. For example, in order to increase the depth of field, the brightness of the lighting source is increased when collecting distant optical information, and the brightness of the lighting source is reduced when collecting nearby optical information.
  • the aiming light spot is easily submerged by the illumination source, making it difficult for the human eye to distinguish the position of the aiming light spot, and thus making it impossible to accurately aim at the optical information, resulting in a poor indication effect.
  • the purpose of the invention of the present application is to provide an imaging device and an imaging method in which the fill light brightness of a fill light unit can be adjusted and the brightness of an aiming pattern projected by an aiming unit can be adjusted simultaneously.
  • the present application provides an imaging device, characterized in that it includes: an image sensor, used to collect an image of an optical mark; a fill light unit, used to provide fill light to illuminate the optical mark when the image sensor collects the image; an aiming unit, used to project an aiming pattern to aim at the optical mark; a control unit, electrically connecting the image sensor, the fill light unit and the aiming unit to adjust the fill light brightness of the fill light unit, and simultaneously adjust the brightness of the aiming pattern projected by the aiming unit.
  • simultaneously adjusting the brightness of the aiming pattern of the aiming unit includes: when the fill light brightness of the fill light unit increases, simultaneously increasing the output power of the aiming unit.
  • the image sensor is used to collect multiple frames of images continuously, the fill light unit is turned on during the exposure time of each frame of image and turned off during the output time, and the aiming unit is turned on during the exposure time of each frame of image.
  • the invention relates to a method for controlling a plurality of image frames to be closed at a predetermined time and turned on at an output time, wherein the exposure time of a next frame of image is adjusted based on a previous frame of image in a continuous plurality of frames of image, and the turn-on time of the fill light unit is adjusted based on the exposure time of the next frame of image, and the turn-on time and output power of the aiming unit are adjusted according to the exposure time of the next frame of image.
  • the output power of the targeting unit is increased when the exposure time of the next frame of image is lengthened, and the output power of the targeting unit is reduced when the exposure time of the next frame of image is shortened.
  • the fill light unit includes a near depth of field fill light and a far depth of field fill light
  • the near depth of field fill light provides a larger and darker lighting field than the far depth of field fill light
  • adjusting the fill light brightness of the fill light unit includes switching between the near depth of field fill light and the far depth of field fill light
  • simultaneously adjusting the brightness of the aiming pattern of the aiming unit includes: increasing the brightness of the aiming pattern when switching from the near depth of field fill light to the far depth of field fill light.
  • the present application provides an imaging method, characterized in that it includes: providing fill light through a fill light unit to illuminate an optical marker; projecting an aiming pattern through an aiming unit to aim at the optical marker; collecting an image of the optical marker through an image sensor; adjusting the fill light brightness of the fill light unit, and simultaneously adjusting the brightness of the aiming pattern projected by the aiming unit.
  • simultaneously adjusting the brightness of the aiming pattern of the aiming unit includes: when the fill light brightness of the fill light unit increases, simultaneously increasing the output power of the aiming unit.
  • the image sensor is used to capture multiple consecutive frames of images
  • the fill light unit is turned on at the exposure time of each frame of image and turned off at the output time
  • the aiming unit is turned off at the exposure time of each frame of image and turned on at the output time
  • the exposure time of the next frame of image is adjusted based on the previous frame of image in the multiple consecutive frames of image
  • the start-up time of the fill light unit is adjusted based on the exposure time of the next frame of image
  • the start-up time and output power of the aiming unit are adjusted according to the exposure time of the next frame of image.
  • the output power of the targeting unit is increased when the exposure time of the next frame of image is lengthened, and the output power of the targeting unit is reduced when the exposure time of the next frame of image is shortened.
  • the fill light unit includes a near depth of field fill light and a far depth of field fill light
  • the near depth of field fill light provides a larger and darker lighting field than the far depth of field fill light
  • adjusting the fill light brightness of the fill light unit includes switching between the near depth of field fill light and the far depth of field fill light
  • simultaneously adjusting the brightness of the aiming pattern of the aiming unit includes: increasing the brightness of the aiming pattern when switching from the near depth of field fill light to the far depth of field fill light.
  • the control unit adjusts the fill light brightness of the fill light unit and synchronously adjusts the brightness of the aiming pattern projected by the aiming unit, so that the aiming pattern remains clearly visible to the human eye under different fill light brightnesses, thereby accurately aiming the optical mark and achieving a good indication effect.
  • FIG1 is a schematic diagram of an imaging device according to an embodiment of the present application.
  • FIG2 is a schematic diagram of an imaging device according to another embodiment of the present application.
  • FIG3 is a block diagram of an imaging device according to an exemplary embodiment of the present application.
  • FIG4 is a circuit diagram of an imaging device according to an embodiment of the present application.
  • FIG5 is a timing diagram of an imaging device capturing images according to an embodiment of the present application.
  • FIG. 6 is a block diagram of an imaging device according to another exemplary embodiment of the present application.
  • the imaging device 100 disclosed in the present application may be various scanning engines, scanning guns, ring scanners, handheld terminals (PDAs), fixed scanners, image recognition robots, etc.
  • the imaging device 100 may be used to collect one or more optical marks, such as one-dimensional codes, two-dimensional codes, OCR graphics, ultraviolet anti-counterfeiting codes, infrared anti-counterfeiting codes, etc.
  • the imaging device 100 is a scanning gun; as shown in another embodiment of FIG. 2 , the imaging device 100 is a handheld terminal.
  • the structure, function and imaging method of the imaging device 100 of the present application will be described in detail below in conjunction with specific embodiments.
  • the imaging device 100 includes a combination of an optical system 1 that can collect light and an image sensor 2 that performs photoelectric conversion on the light collected by the optical system 1, and the two together form a field of view for collecting images.
  • the optical system 1 may include one or more reflectors, prisms, lenses, or a combination thereof, and the image sensor 2 may also be one or more, and one image sensor 2 may correspond to one/a set of the optical system 1, or multiple image sensors 2 may share the same/a set of optical system 1, or multiple/a plurality of optical systems 1 may share the same image sensor 2.
  • the image sensor 2 may be a CCD or CMOS or other type of image sensor 2, and the image sensor 2 is used to convert the optical signal of the collected image into an electrical signal, and further output the electrical signal as a digital signal.
  • the aiming unit 3 is used to project an aiming pattern to assist the user in aiming at the optical mark when the image sensor 2 collects an image; the aiming unit 3 may be a laser aiming or an LED aiming.
  • the fill light unit 4 includes a plurality of fill light lamps 6 arranged on a fill light circuit board 5, which are used to provide fill light to illuminate the optical mark when the image sensor 2 collects an image.
  • Control unit 7 The storage unit 8 is electrically connected to the image sensor 2, the fill light unit 4 and the aiming unit 3, and is used to receive the digital signal of the image output by the image sensor 2, and further decode the information of the optical mark in the image.
  • the storage unit 8 can be used to store various control algorithms or decoding algorithms disclosed in this application, etc., for the control unit 7 or other modules to call.
  • FIG4 shows a circuit diagram of an imaging device 100 according to an embodiment.
  • the image sensor 2 captures multiple consecutive frames of images, after capturing the previous frame of image, it will adjust the exposure time of the next frame of image according to information such as the brightness and exposure time of the previous frame of image, and output a STROBE signal to the control unit 7, the aiming control circuit 9 and the fill light circuit board 5.
  • the control unit 7 adjusts the digital potentiometer 10 of the aiming unit 3 according to the exposure time of the next frame of image, and then adjusts the start time and output power of the aiming unit 3 when capturing the next frame of image through the aiming control circuit 9.
  • the fill light circuit board 5 adjusts the start time of the fill light unit 4 when capturing the next frame of image according to the exposure time of the next frame of image.
  • the fill light unit 4 and the aiming unit 3 are adjusted synchronously in real time.
  • the timing diagram 200 in FIG. 5 shows the image acquisition signal 201 of the image sensor 2 for acquiring a plurality of consecutive frames of images, the fill light signal 202 of the fill light unit 4, and the aiming signal 203 of the aiming unit 3.
  • the image sensor 2 continuously acquires images at a fixed frame rate, wherein the high level of the image acquisition signal 201 is the exposure time of the image, and the low level includes the output time of the image (the low level may also include other times such as the reset time).
  • the image sensor 2 controls the exposure time of each frame of the image according to the automatic exposure algorithm. Specifically, the image sensor 2 adjusts the exposure time of the next frame of the image based on the previous frame of the consecutively acquired multiple frames of images.
  • the fill light signal 202 is almost synchronized with the image acquisition signal 201, and the fill light unit 4 is turned on during the exposure time of each frame of image and turned off during the output time of the image, so the high level of the fill light signal 202 can correspond to the high level of the image acquisition signal 201, and the low level of the fill light signal 202 can correspond to the low level of the image acquisition signal 201.
  • the fill light unit 4 can be turned on only during a part of the exposure time of each frame of image.
  • the aiming signal 203 of the aiming unit 3 is synchronously adjusted.
  • the aiming unit 3 is turned on and projects the aiming pattern when the aiming signal 203 is at a high level, and is turned off when the aiming signal 203 is at a low level, wherein the high level of the aiming signal 203 corresponds to the low level of the image acquisition signal 201, and the low level of the aiming signal 203 corresponds to the image acquisition signal
  • the high level of 201 makes the start time of the aiming unit 3 and the exposure time of the image sensor 2 staggered, so as to prevent the aiming pattern from being captured by the image sensor 2 and causing overexposure of the image.
  • the opening time of the fill light unit 4 Since the exposure time of the next frame image is adjusted according to the previous frame image, and the opening time of the fill light unit 4 is adjusted according to the exposure time of the next frame image, when the exposure time of the next frame image is lengthened, the opening time of the fill light unit 4 will also be lengthened, the duty cycle of the opening time of the fill light unit 4 will become larger, and the fill light brightness visually increased by the human eye; and when the exposure time of the next frame image is shortened, the opening time of the fill light unit 4 will also be shortened, the duty cycle of the opening time of the fill light unit 4 will become smaller, and the fill light brightness visually reduced by the human eye.
  • the on-time of the aiming unit 3 is shortened instead, and the duty cycle of the on-time of the aiming unit 3 becomes smaller. It is necessary to increase the output power of the aiming unit 3 to ensure that the aiming pattern is not submerged by the fill light with enhanced brightness.
  • the high level 213 of the aiming signal 203 shows this point. The duration of the high level 213 is shorter than that of other high levels of the aiming signal 203, but the level of the high level 213 is higher than that of other high levels of the aiming signal 203; conversely, when the exposure time of the next frame of image is shortened, the on-time of the aiming unit 3 becomes longer.
  • the output power of the aiming unit 3 can be appropriately reduced. This is shown by the high level 223 of the aiming signal 203.
  • the duration of the high level 223 is longer than that of other high levels, while the level of the high level 223 is lower than that of other high levels.
  • a functional relationship between the exposure time of each frame of image and the output power of the aiming unit 3 can be established, so that once the exposure time of the next frame of image is determined, the output power of the aiming unit 3 can be synchronously and quickly adjusted according to the functional relationship, so that when multiple frames of images are continuously collected, the aiming pattern is always clearly visible to the human eye, and the aiming pattern will not be submerged by fill light to cause aiming interruption.
  • the aiming pattern can always provide accurate aiming instructions.
  • FIG6 shows a block diagram of the imaging device 100 in another embodiment, which is different from the above-mentioned embodiment in that the fill light unit 4 includes a near depth of field fill light 11 and a far depth of field fill light 12, which are respectively located on both sides of the optical system 1, and the near depth of field fill light 11 has a larger light output angle and a darker brightness, so as to provide a near depth of field illumination field; the far depth of field fill light 12 has a more concentrated light beam and a brighter brightness, so as to provide a far depth of field illumination field, and the center lines of the near depth of field illumination field and the far depth of field illumination field are both inclined toward the center of the field of view of the optical system 1 and the image sensor 2, and the center line of the near depth of field illumination field intersects with the center of the field of view at a near point, and the center line of the far depth of field illumination field intersects with the center of the field of view at a far point.
  • the near depth of field fill light 11 is used for fill light when collecting near optical markers
  • the near depth of field fill light 11 and the far depth of field fill light 12 can be switched between by a variety of control methods.
  • the brightness of the previous frame of the image in the continuously acquired multiple frames can be used to determine whether the near depth of field fill light 11 or the far depth of field fill light 12 needs to be turned on when acquiring the next frame of the image. Specifically, if the brightness of the current frame of the image exceeds a threshold, the near depth of field fill light 11 is used for fill light when acquiring the next frame of the image. If the brightness of the current frame of the image does not exceed the threshold, the far depth of field fill light 12 is used for fill light when acquiring the next frame of the image.
  • the distance of the optical marker can be detected by a distance sensor.
  • the near depth of field fill light 11 is used for fill light.
  • the far depth of field fill light 12 is switched to fill light.
  • the brightness of the optical mark can be obtained by a light sensor. When the brightness of the optical mark exceeds a threshold, the near depth of field fill light 11 is used for fill light. When the brightness of the optical mark does not exceed the threshold, the far depth of field fill light 12 is switched for fill light.
  • the aiming unit 3 can be controlled in real time, and the output power of the aiming unit 3 can be adjusted in real time, so that the brightness adjustment of the fill light unit 4 is synchronized with the brightness adjustment of the aiming unit 3, and it can even be achieved that when the brightness of the fill light unit 4 changes, the brightness of the aiming unit 3 hardly changes in the visual perception of the human eye, and the aiming pattern is always clearly visible, so as to achieve an accurate aiming indication effect; while in other embodiments, the added distance sensor or light sensor not only increases the cost, but also the feedback is not real-time, resulting in that after the brightness of the fill light unit 4 changes, the brightness of the aiming unit 3 changes with delay, and the
  • the number of fill light lamps 6 turned on can be controlled to adjust the overall fill light brightness of the fill light unit 4, and a comparison table between the number of turned-on fill light lamps 6 and the output power of the aiming unit 3 is pre-established.
  • the aiming unit 3 is quickly adjusted to the corresponding output power according to the comparison table.
  • the control unit 7 adjusts the fill light brightness of the fill light unit 4 and synchronously adjusts the brightness of the aiming pattern projected by the aiming unit 3, so that the aiming pattern remains clearly visible to the human eye under different fill light brightnesses, thereby accurately aiming the optical mark and achieving a good indication effect.

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Abstract

一种成像装置(100)和成像方法，成像装置(100)包括图像传感器(2)，用以采集光学标记的图像；补光单元(4)，用以在图像传感器(2)采集图像时提供补光以照亮光学标记；瞄准单元(3)，用以投射瞄准图案瞄准光学标记；控制单元(7)，电性连接图像传感器(2)、补光单元(4)和瞄准单元(3)，以调节补光单元(4)的补光亮度，以及同时调节瞄准单元(3)投射的瞄准图案的亮度。通过控制单元(7)调节补光单元(4)的补光亮度以及同步调节瞄准单元(3)投射的瞄准图案的亮度，使得瞄准图案在不同的补光亮度下维持人眼清晰可见，从而可精确瞄准光学标记，达到良好的指示效果。

Description

成像装置和成像方法 技术领域
本申请涉及图像采集领域，尤指一种成像装置和成像方法。
背景技术
基于图像扫描的光学信息采集，包括对机器可读的各种光学信息的采集，常见的机器可读光学信息包括一维码、二维码、OCR图文、紫外防伪码、红外防伪码等。
为了快速获得清晰的图像，常使用照明源照明待扫描的光学信息，同时使用瞄准光源投射瞄准光斑瞄准光学信息。传统的照明方式为照明源长亮照明，而且照明源亮度恒定。
在一些场景中，需要采用亮度可变的照明源，比如为了增大景深，在采集远处的光学信息时，提高照明源的亮度，而采集近处的光学信息时，则降低照明源的亮度。
然而，当照明源的亮度提高时，瞄准光斑容易被照明源淹没，导致人眼视觉难以分辨瞄准光斑的位置，进而无法准确瞄准光学信息，指示效果差。
需要开发一些新的技术来解决上述问题。
发明内容
本申请创作的目的在于提供一种补光单元的补光亮度可调节且瞄准单元投射的瞄准图案的亮度可同时调节的成像装置和成像方法。
为实现上述目的，本申请采用以下技术手段：
本申请提供一种成像装置，其特征在于，包括：图像传感器，用以采集光学标记的图像；补光单元，用以在所述图像传感器采集图像时提供补光以照亮光学标记；瞄准单元，用以投射瞄准图案瞄准光学标记；控制单元，电性连接所述图像传感器、所述补光单元和所述瞄准单元，以调节所述补光单元的补光亮度，以及同时调节所述瞄准单元投射的瞄准图案的亮度。
可选地，同时调节所述瞄准单元的瞄准图案的亮度包括：当所述补光单元的补光亮度增大时同时增大所述瞄准单元的输出功率。
可选地，所述图像传感器用以采集连续的多帧图像，所述补光单元在每一帧图像的曝光时间开启且在输出时间关闭，所述瞄准单元在每一帧图像的曝光 时间关闭且在输出时间开启，其中基于连续的多帧图像中的前一帧图像调节下一帧图像的曝光时间，并且基于下一帧图像的曝光时间调节所述补光单元的开启时间，以及根据下一帧图像的曝光时间调节所述瞄准单元的开启时间和输出功率。
可选地，当下一帧图像的曝光时间加长时提高所述瞄准单元的输出功率，以及当下一帧图像的曝光时间缩短时降低所述瞄准单元的输出功率。
可选地，所述补光单元包括近景深补光灯和远景深补光灯，所述近景深补光灯提供比所述远景深补光灯更大和更暗的照明场，调节所述补光单元的补光亮度包括在所述近景深补光灯和所述远景深补光灯之间切换，同时调节所述瞄准单元的瞄准图案的亮度包括：当由近景深补光灯切换为远景深补光灯时增大瞄准图案的亮度。
本申请提供一种成像方法，其特征在于，包括：通过补光单元提供补光照亮光学标记；通过瞄准单元投射瞄准图案瞄准光学标记；通过图像传感器采集光学标记的图像；调节所述补光单元的补光亮度，以及同时调节所述瞄准单元投射的瞄准图案的亮度。
可选地，同时调节所述瞄准单元的瞄准图案的亮度包括：当所述补光单元的补光亮度增大时同时增大所述瞄准单元的输出功率。
可选地，所述图像传感器用以采集连续的多帧图像，所述补光单元在每一帧图像的曝光时间开启且在输出时间关闭，所述瞄准单元在每一帧图像的曝光时间关闭且在输出时间开启，其中基于连续的多帧图像中的前一帧图像调节下一帧图像的曝光时间，并且基于下一帧图像的曝光时间调节所述补光单元的开启时间，以及根据下一帧图像的曝光时间调节所述瞄准单元的开启时间和输出功率。
可选地，当下一帧图像的曝光时间加长时提高所述瞄准单元的输出功率，以及当下一帧图像的曝光时间缩短时降低所述瞄准单元的输出功率。
可选地，所述补光单元包括近景深补光灯和远景深补光灯，所述近景深补光灯提供比所述远景深补光灯更大和更暗的照明场，调节所述补光单元的补光亮度包括在所述近景深补光灯和所述远景深补光灯之间切换，同时调节所述瞄准单元的瞄准图案的亮度包括：当由近景深补光灯切换为远景深补光灯时增大瞄准图案的亮度。
与现有技术相比，本申请具有以下有益效果：
通过控制单元调节补光单元的补光亮度以及同步调节瞄准单元投射的瞄准图案的亮度，使得瞄准图案在不同的补光亮度下维持人眼清晰可见，从而可精确瞄准光学标记，达到良好的指示效果。
附图说明
图1为本申请一种实施例成像装置的示意图；
图2为本申请另一种实施例成像装置的示意图；
图3为本申请一种示例性实施例的成像装置的框图；
图4为本申请一种实施例成像装置的电路图；
图5为本申请一种实施例成像装置采集图像的时序图；
图6为本申请另一种示例性实施例的成像装置的框图。
具体实施方式
为便于更好的理解本申请的目的、结构、特征以及功效等，现结合附图和具体实施方式对本申请作进一步说明。
本申请公开的所述成像装置100，可以是各种扫描引擎、扫描枪、指环式扫描器、手持终端(PDA)、固定式扫描器、图像识别机器人等，所述成像装置100可用于采集一种或多种光学标记，如一维码、二维码、OCR图文、紫外防伪码、红外防伪码等。如图1中的一种实施例，所述成像装置100为扫描枪；如图2中的另一种实施例，所述成像装置100为手持终端。下面将结合具体实施例，对本申请的所述成像装置100的结构、功能和成像方法做详细介绍。
补充参照图3中的示例性实施例的所述成像装置100的框图，所述成像装置100包括可以汇集光线的光学***1与将光学***1汇集的光线进行光电转化的图像传感器2的组合，二者共同形成采集图像的视场。所述光学***1可以包括一个或多个反射镜、棱镜、透镜或其组合，所述图像传感器2也可以为一个或多个，可以是一个所述图像传感器2对应一个/一套所述光学***1，或者多个所述图像传感器2可以共用同一个/一套光学***1，或者多个/多套光学***1可以共用同一个图像传感器2。所述图像传感器2可以是CCD或CMOS或其它类型的图像传感器2，所述图像传感器2用以将所采集图像的光信号转化为电信号，并且进一步将电信号输出为数字信号。瞄准单元3用以在所述图像传感器2采集图像时投射瞄准图案辅助用户瞄准光学标记；所述瞄准单元3可以为激光瞄准或LED瞄准。补光单元4包括设于补光电路板5上的多个补光灯6，用以在所述图像传感器2采集图像时提供补光以照亮光学标记。控制单元7 电性连接所述图像传感器2、所述补光单元4和所述瞄准单元3，且用以接收所述图像传感器2输出的图像的数字信号，并且进一步解码图像中光学标记的信息。存储单元8可用来存储本申请所公开的各种控制算法或解码算法等，供控制单元7或其它模块调用。
图4示出了一种实施例所述成像装置100的电路图，所述图像传感器2在采集连续的多帧图像时，当采集完前一帧图像，将会根据前一帧图像的亮度和曝光时间等信息调节下一帧图像的曝光时间，并且输出STROBE信号至所述控制单元7、瞄准控制电路9和补光电路板5，所述控制单元7根据下一帧图像的曝光时间调节控制瞄准单元3的数字电位器10，进而通过瞄准控制电路9调节下一帧图像采集时所述瞄准单元3的开启时间和输出功率；同时，所述补光电路板5根据下一帧图像的曝光时间调节下一帧图像采集时所述补光单元4的开启时间；通过获取所述图像传感器2输出的STROBE信号，使得所述补光单元4与所述瞄准单元3实时同步调节。
进一步参照图5中的时序图200，示出了所述图像传感器2采集连续的多帧图像的图像采集信号201、补光单元4的补光信号202和瞄准单元3的瞄准信号203。其中，所述图像传感器2以固定帧率连续采集图像，其中，图像采集信号201的高电平为图像的曝光时间，低电平则包括图像的输出时间(低电平也可包括复位时间等其它时间)。且所述图像传感器2根据自动曝光算法控制每一帧图像的曝光时间，具体来说，所述图像传感器2基于连续采集的多帧图像中的前一帧图像调整下一帧图像的曝光时间，比如当前一帧图像的亮度过高而导致局部过曝，则对应减少下一帧图像的曝光时间；反之，当前一帧图像的亮度过暗而导致曝光不足，则对应增加下一帧图像的曝光时间。本实施例中，补光信号202几乎与图像采集信号201同步，所述补光单元4在每一帧图像的曝光时间开启且在图像的输出时间关闭，因此，补光信号202的高电平可对应图像采集信号201的高电平，补光信号202的低电平可对应图像采集信号201的低电平。其它实施例中(未图示，下同)，所述补光单元4可仅在每一帧图像的曝光时间的一部分开启。
本实施例中，在调节所述补光单元4的补光信号202的同时，同步调节所述瞄准单元3的瞄准信号203，瞄准单元3在瞄准信号203的高电平开启并投射瞄准图案，且在瞄准信号203的低电平关闭，其中瞄准信号203的高电平对应于图像采集信号201的低电平，而瞄准信号203的低电平对应于图像采集信号 201的高电平，使得所述瞄准单元3的开启时间与所述图像传感器2的曝光时间错开，避免瞄准图案被图像传感器2捕获，造成图像过曝。
由于下一帧图像的曝光时间根据前一帧图像进行调节，而所述补光单元4的开启时间根据下一帧图像的曝光时间进行调节，当下一帧图像的曝光时间加长时，所述补光单元4的开启时间也将加长，所述补光单元4的开启时间的占空比变大，人眼视觉上补光亮度增大；而当下一帧图像的曝光时间缩短时，所述补光单元4的开启时间也将缩短，所述补光单元4的开启时间的占空比变小，人眼视觉上补光亮度降低。然而，当下一帧图像的曝光时间加长，所述瞄准单元3的开启时间反而缩短，所述瞄准单元3的开启时间的占空比变小，需要提高所述瞄准单元3的输出功率，才能保证所述瞄准图案不被亮度增强的补光淹没，图4的时序图200中，瞄准信号203的高电平213示出了这一点，高电平213的持续时间比瞄准信号203的其它高电平短，但高电平213的电平高于瞄准信号203的其它高电平；反之，当下一帧图像的曝光时间缩短，所述瞄准单元3的开启时间变长，为了防止瞄准图案过亮和节省功耗，可以适当降低所述瞄准单元3的输出功率，瞄准信号203的高电平223示出了这一点，高电平223的持续时间长于其它高电平，而高电平223的电平低于其它高电平。可以经过预先测试，建立每一帧图像的曝光时间与所述瞄准单元3的输出功率之间的函数关系，使得一旦确定下一帧图像的曝光时间，可以根据函数关系同步快速调节所述瞄准单元3的输出功率，使得在连续采集多帧图像时，瞄准图案在人眼中始终清晰可见，不会出现瞄准图案被补光淹没而导致瞄准中断的情况，瞄准图案始终可以提供精确的瞄准指示。
图6示出了另一种实施例中所述成像装置100的框图，其与前述实施例的不同之处在于，所述补光单元4包括近景深补光灯11和远景深补光灯12，所述近景深补光灯11和所述远景深补光灯12分别位于所述光学***1的两侧，所述近景深补光灯11出光角度更大、且亮度更暗，用以提供近景深照明场；所述远景深补光灯12出光光束更集中且亮度更亮，用以提供远景深照明场，且所述近景深照明场和所述远景深照明场的中心线均朝向所述光学***1和所述图像传感器2的视场中心倾斜，所述近景深照明场的中心线与视场中心交汇于近点，所述远景深照明场的中心线与视场中心交汇于远点。所述近景深补光灯11用以在采集近处的光学标记时进行补光，所述远景深补光灯12则用以在采集远处的光学标记时进行补光。
可选地，可以通过多种控制方式在所述近景深补光灯11和所述远景深补光灯12之间进行切换。一种实施例中，可通过连续采集的多帧图像中，前一帧图像的亮度判断下一帧图像采集时需要开启所述近景深补光灯11或所述远景深补光灯12，具体来说，当前一帧图像的亮度超过一阈值，则下一帧图像采集时通过所述近景深补光灯11补光，当前一帧图像的亮度不超过该阈值，则下一帧图像采集时通过所述远景深补光灯12补光。另一种实施例中，可通过距离传感器检测光学标记的距离，当光学标记的距离不超过一定距离阈值，则采用所述近景深补光灯11进行补光，当光学标记的距离超过一定距离阈值，则切换为所述远景深补光灯12进行补光。又一种实施例中，可通过光线感应器获取光学标记的亮度，当光学标记的亮度超过一阈值，则通过所述近景深补光灯11补光，当光学标记的亮度不超过该阈值，则切换为远景深补光灯12进行补光。本申请实施例中，优选为通过前一帧图像的亮度下一帧图像采集时需要判断开启所述近景深补光灯11或所述远景深补光灯12，这有利于对瞄准单元3的实时控制，因为获取所述图像传感器2的STROBE信号，可以实时对所述瞄准单元3进行控制，实时调节所述瞄准单元3的输出功率，使得所述补光单元4的亮度调节与所述瞄准单元3的亮度调节同步进行，甚至可以实现当所述补光单元4的亮度变化时，所述瞄准单元3的亮度在人眼视觉的观感上几乎没有变化，瞄准图案始终清晰可见，达到精确的瞄准指示效果；而其它实施例中，增加的距离传感器或光线感应器既增加了成本，而且反馈不是实时的，导致补光单元4的亮度改变之后，瞄准单元3的亮度延迟改变，瞄准图案在某一时间段被补光淹没，在人眼视觉的观感上，瞄准图案出现明显的闪烁或消失，指示效果相对较差。
一些实施例中，可以参考图3示出的，当成像装置100的补光单元4具有多个补光灯6，可以控制补光灯6开启的数量来调节补光单元4整体的补光亮度，并且预先建立开启的补光灯6的数量与瞄准单元3的输出功率的对照表，当开启一定数量的补光灯6，则根据对照表快速调节所述瞄准单元3至对应的输出功率。
本申请的成像装置和成像方法具有以下有益效果：
通过控制单元7调节补光单元4的补光亮度以及同步调节瞄准单元3投射的瞄准图案的亮度，使得瞄准图案在不同的补光亮度下维持人眼清晰可见，从而可精确瞄准光学标记，达到良好的指示效果。
以上详细说明仅为本申请之较佳实施例的说明，非因此局限本申请之专利 范围，所以，凡运用本创作说明书及图示内容所为之等效技术变化，均包含于本创作之专利范围内。

Claims (14)

  1. 一种成像装置，其特征在于，包括：
    图像传感器，用以采集光学标记的图像；
    补光单元，用以在所述图像传感器采集图像时提供补光以照亮光学标记；
    瞄准单元，用以投射瞄准图案瞄准光学标记；
    控制单元，电性连接所述图像传感器、所述补光单元和所述瞄准单元，以调节所述补光单元的补光亮度，以及同时调节所述瞄准单元投射的瞄准图案的亮度。
  2. 如权利要求1所述的成像装置，其特征在于：同时调节所述瞄准单元的瞄准图案的亮度包括：当所述补光单元的补光亮度增大时同时增大所述瞄准单元的输出功率。
  3. 如权利要求1所述的成像装置，其特征在于：所述图像传感器用以采集连续的多帧图像，所述补光单元在每一帧图像的曝光时间开启且在输出时间关闭，所述瞄准单元在每一帧图像的曝光时间关闭且在输出时间开启，其中基于连续的多帧图像中的前一帧图像调节下一帧图像的曝光时间，并且基于下一帧图像的曝光时间调节所述补光单元的开启时间，以及根据下一帧图像的曝光时间调节所述瞄准单元的开启时间和输出功率。
  4. 如权利要求3所述的成像装置，其特征在于：当下一帧图像的曝光时间加长时提高所述瞄准单元的输出功率，以及当下一帧图像的曝光时间缩短时降低所述瞄准单元的输出功率。
  5. 如权利要求4所述的成像装置，其特征在于：提高所述瞄准单元的输出功率包括：控制所述瞄准单元的开启时间的占空比变小，所述瞄准单元的瞄准信号的高电平提高。
  6. 如权利要求1所述的成像装置，其特征在于：所述补光单元包括近景深补光灯和远景深补光灯，所述近景深补光灯提供比所述远景深补光灯更大和更暗的照明场，调节所述补光单元的补光亮度包括在所述近景深补光灯和所述远景深补光灯之间切换；同时调节所述瞄准单元的瞄准图案的亮度包括：当由近景深补光灯切换为远景深补光灯时增大瞄准图案的亮度。
  7. 如权利要求1所述的成像装置，其特征在于：通过获取所述图像传感器输出的STROBE信号，使得所述补光单元与所述瞄准单元实时同步调节。
  8. 一种成像方法，其特征在于，包括：
    通过补光单元提供补光照亮光学标记；
    通过瞄准单元投射瞄准图案瞄准光学标记；
    通过图像传感器采集光学标记的图像；
    调节所述补光单元的补光亮度，以及同时调节所述瞄准单元投射的瞄准图案的亮度。
  9. 如权利要求8所述的成像方法，其特征在于：同时调节所述瞄准单元的瞄准图案的亮度包括：当所述补光单元的补光亮度增大时同时增大所述瞄准单元的输出功率。
  10. 如权利要求8所述的成像方法，其特征在于：所述图像传感器用以采集连续的多帧图像，所述补光单元在每一帧图像的曝光时间开启且在输出时间关闭，所述瞄准单元在每一帧图像的曝光时间关闭且在输出时间开启，其中基于连续的多帧图像中的前一帧图像调节下一帧图像的曝光时间，并且基于下一帧图像的曝光时间调节所述补光单元的开启时间，以及根据下一帧图像的曝光时间调节所述瞄准单元的开启时间和输出功率。
  11. 如权利要求10所述的成像方法，其特征在于：当下一帧图像的曝光时间加长时提高所述瞄准单元的输出功率，以及当下一帧图像的曝光时间缩短时降低所述瞄准单元的输出功率。
  12. 如权利要求11所述的成像方法，其特征在于：提高所述瞄准单元的输出功率包括：控制所述瞄准单元的开启时间的占空比变小，所述瞄准单元的瞄准信号的高电平提高。
  13. 如权利要求8所述的成像方法，其特征在于：所述补光单元包括近景深补光灯和远景深补光灯，所述近景深补光灯提供比所述远景深补光灯更大和更暗的照明场，调节所述补光单元的补光亮度包括在所述近景深补光灯和所述远景深补光灯之间切换；同时调节所述瞄准单元的瞄准图案的亮度包括：当由近景深补光灯切换为远景深补光灯时增大瞄准图案的亮度。
  14. 如权利要求8所述的成像方法，其特征在于：通过获取所述图像传感器输出的STROBE信号，使得所述补光单元与所述瞄准单元实时同步调节。
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