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CN-121972426-A - Illumination imaging synchronization system and method

CN121972426ACN 121972426 ACN121972426 ACN 121972426ACN-121972426-A

Abstract

The embodiment of the invention provides an illumination imaging synchronization system and method, and relates to the technical field of color selectors. The system comprises at least one camera unit and a plurality of lighting units, wherein the camera unit is used for acquiring images, each lighting unit is composed of a plurality of lighting subunits, the lighting units are respectively connected with the lighting subunits in a one-to-one correspondence manner, each driving unit independently drives the lighting subunits connected with the driving unit, the driving units transmit synchronous signals in a master-slave cascade manner, a head end driving unit is a main driving unit, and a tail end driving unit returns the synchronous signals to the main driving unit through a feedback loop. Therefore, the problems of turn-off tailing, crosstalk and inter-channel exposure mismatch caused by the increase of the driving current can be effectively relieved.

Inventors

  • ZHANG RUYI
  • CHEN XIAODONG
  • Wang Juanqing

Assignees

  • 合肥泰禾智能科技集团股份有限公司

Dates

Publication Date
20260505
Application Date
20260401

Claims (10)

  1. 1. An illumination imaging synchronization system, comprising: at least one camera unit for acquiring images; A plurality of lighting units, each of the lighting units being composed of a plurality of lighting sub-units; The driving units are connected with the illumination sub-units in a one-to-one correspondence manner, and each driving unit independently drives the illumination sub-units connected with the driving unit; The camera units are sequentially cascaded, a synchronous output interface of the main driving unit is connected with a first camera unit, and a last camera unit is connected with a synchronous input interface of the main driving unit.
  2. 2. The illumination imaging synchronization system of claim 1, wherein the drive unit comprises: The processor is used for processing the synchronous signals, executing a delay compensation algorithm and generating a control instruction; the power supply interface is used for supplying power to the control side of the driving unit and is mutually independent of the power side power supply; The synchronous input interface and the synchronous output interface are deployed in a differential signal mode and are used for receiving and forwarding synchronous signals with long distance and common mode interference resistance; The device comprises a processor, a command interface, a driving unit, a control unit and a control unit, wherein the command interface is connected with the processor and is used for receiving a configuration instruction from a man-machine interaction screen end, and the configuration instruction comprises setting of the effective level polarity of a synchronous pulse signal; and the driving output interface is used for connecting and driving the light source of the lighting unit.
  3. 3. The illumination imaging synchronization system of claim 2, wherein the synchronization pulse signal has embedded therein encoded information for identifying a spectral channel of a current synchronization period; The command interface receives configuration instructions from a man-machine interaction screen end, and configures corresponding spectrum channel codes for each driving unit; the processor analyzes the coding information in the received synchronous pulse signal, and when the coding information is matched with the spectrum channel code configured by the processor, the driving unit executes illumination action.
  4. 4. The illumination imaging synchronization system according to claim 2, wherein the driving unit is configured with an address setting device for setting a unique address number thereof, the address setting device is a dial switch, the unique address number is set for the driving unit by a hardware dial mode, and the address number is used for distinguishing different nodes in a cascade synchronization link and participating in delay compensation calculation.
  5. 5. The illumination imaging synchronization system according to claim 4, wherein the driving unit performs synchronization signal propagation delay compensation based on its own address, and wherein the delay compensation has a calculation formula of: Wherein, the For the address of the current drive unit, For the total number of drive units, For the transmission delay of the single-ended signal to the differential signal, The receiving delay is from differential signal to single-ended signal.
  6. 6. The illumination imaging synchronization system of claim 5, wherein the processor comprises a counter; After receiving the synchronous pulse signal, the driving unit calculates the final value of the counter according to the address identification and the total number of the driving units: Wherein, the An operating clock frequency for the counter; The counter starts counting from an initial value, and when the count value reaches the final value of the counter, the corresponding illumination action is triggered.
  7. 7. The illumination imaging synchronization system of claim 1, wherein the drive unit comprises a light source drive circuit for driving the illumination unit, the light source drive circuit comprising a power conversion main loop and a fast energy release module; when the driving unit receives the turn-off instruction, the rapid energy release module is triggered, and energy in the energy storage element is released, so that the light source turn-off tailing time is shortened.
  8. 8. The illumination imaging synchronization system according to claim 7, wherein the power conversion main loop adopts a BUCK topological structure and comprises a power driver, an upper tube, a lower tube, an energy storage inductor, a filter capacitor and a sampling resistor, wherein the power driver outputs signals to control the switch of the upper tube and the lower tube, and the sampling resistor is used for sampling and controlling the current of the power loop; The rapid energy release module comprises a driving chip and an energy release switching tube, wherein the driving chip is connected with the power driver, receives a turn-off control signal and drives the energy release switching tube; When the driving unit receives the turn-off instruction, the upper tube and the lower tube are turned off, and the energy release switch tube is turned on through the driving chip, so that a rapid discharge path from the energy storage inductor, the filter capacitor and the load end to the ground is formed, and energy in the energy storage element is discharged, so that the light source turn-off tailing time is shortened.
  9. 9. The illumination imaging synchronization system according to claim 8, wherein the driving unit sets an exposure delay parameter according to a turn-off trailing time of the fast energy release module to generate a camera trigger signal corresponding to a next illumination unit, so that a start time of a camera exposure window is located after the turn-off trailing of a current illumination unit is finished, so as to avoid crosstalk between light sources.
  10. 10. An illumination imaging synchronization method applied to the illumination imaging synchronization system according to any one of claims 1 to 9, comprising: the main driving unit generates a synchronous pulse signal and transmits the synchronous pulse signal step by step along a forward link formed by sequentially cascading a plurality of driving units, wherein each driving unit receives the synchronous signal through a synchronous input interface thereof and forwards the synchronous signal to a next driving unit through a synchronous output interface thereof; after receiving the synchronous pulse signals, each driving unit calculates a corresponding compensation delay value according to a preset unique address number of the driving unit, and executes corresponding illumination action after delaying the compensation delay value so as to realize the cooperative illumination of the light sources of the corresponding illumination units at the same moment; after the end driving unit completes the receiving of the synchronous signal, the feedback signal is returned to the synchronous input interface of the main driving unit; the main driving unit monitors the integrity of the synchronous link according to the received feedback signal and measures the loop time from sending the main synchronous pulse to receiving the feedback signal; And the main driving unit dynamically calibrates the link transmission delay parameter according to the loop-back time, and updates the compensation delay value calculation reference of each driving unit.

Description

Illumination imaging synchronization system and method Technical Field The invention relates to the technical field of color selectors, in particular to an illumination imaging synchronization system and method. Background The color sorting equipment is widely applied to the fields of grains, minerals, renewable resources and the like, and is characterized in that a multichannel camera is used for collecting images of high-speed moving materials, and accurate sorting is realized according to spectral characteristics. A typical color selection system includes a plurality of imaging channels, each configured with at least two cameras (e.g., front and rear views), and an illumination system associated therewith. The illumination system typically comprises functionally diverse light sources, such as a backlight for providing a uniform background, a main lamp for reflection/projection imaging, and an ultraviolet main lamp required to excite fluorescence for a specific substance (e.g. zein). In the related art, a lighting unit generally adopts a single high-power light bar structure and is uniformly controlled by a single driving circuit. The design can meet the requirements in small-scale and single-spectrum application, but when the design is oriented to modern color selection scenes with high precision, multiple spectrums and multiple channels, the tail is seriously cut off due to high current driving, image crosstalk is caused, and the synchronization precision of multiple nodes is insufficient, so that imaging mismatch among the channels is caused. Disclosure of Invention It is therefore an objective of embodiments of the present invention to provide an illumination imaging synchronization system and method to at least partially improve the above-mentioned problems. In order to achieve the above object, the technical scheme adopted by the embodiment of the invention is as follows: In a first aspect, an embodiment of the present invention provides an illumination imaging synchronization system, including: at least one camera unit for acquiring images; A plurality of lighting units, each of the lighting units being composed of a plurality of lighting sub-units; The driving units are connected with the illumination sub-units in a one-to-one correspondence manner, and each driving unit independently drives the illumination sub-units connected with the driving unit; The camera units are sequentially cascaded, a synchronous output interface of the main driving unit is connected with a first camera unit, and a last camera unit is connected with a synchronous input interface of the main driving unit. Optionally, the driving unit includes: The processor is used for processing the synchronous signals, executing a delay compensation algorithm and generating a control instruction; the power supply interface is used for supplying power to the control side of the driving unit and is mutually independent of the power side power supply; The synchronous input interface and the synchronous output interface are deployed in a differential signal mode and are used for receiving and forwarding synchronous signals with long distance and common mode interference resistance; The device comprises a processor, a command interface, a driving unit, a control unit and a control unit, wherein the command interface is connected with the processor and is used for receiving a configuration instruction from a man-machine interaction screen end, and the configuration instruction comprises setting of the effective level polarity of a synchronous pulse signal; and the driving output interface is used for connecting and driving the light source of the lighting unit. Optionally, coding information is embedded in the synchronization pulse signal and is used for identifying a spectrum channel of the current synchronization period; The command interface receives configuration instructions from a man-machine interaction screen end, and configures corresponding spectrum channel codes for each driving unit; the processor analyzes the coding information in the received synchronous pulse signal, and when the coding information is matched with the spectrum channel code configured by the processor, the driving unit executes illumination action. Optionally, the driving unit is configured with an address setting device for setting a unique address number, the address setting device is a dial switch, the unique address number is set for the driving unit in a hardware dial mode, and the address number is used for distinguishing different nodes in a cascade synchronous link and participating in delay compensation calculation. Optionally, the driving unit performs synchronous signal propagation delay compensation based on the self address, wherein the calculation formula of the delay compensation is as follows: Wherein, the For the address of the current drive unit,For the total number of drive units,For the transmission delay of the single-ended signal to the d