Illumination and exposure synchronization control method and system in low frame rate mode

Abstract

The present invention provides a method and system for synchronously controlling illumination and exposure in a low frame rate mode, the method comprising: setting an exposure interval time #imgabs0#, an illumination frequency gain #imgabs1#, an illumination duration #imgabs2#, and an exposure duration #imgabs3#. When each exposure is turned on, consecutive #imgabs4# timing cycles are set; at the beginning of the first timing cycle, the illumination and exposure are controlled to be turned on at the same time, and after reaching the illumination duration #imgabs5# or the exposure duration #imgabs6#, the illumination and exposure are controlled to be turned off at the same time until the end of the first timing cycle; at the beginning of the #imgabs7# timing cycle, the illumination is controlled to be turned on, and after reaching the illumination duration #imgabs8#, the illumination is controlled to be turned off until the end of the #imgabs9# timing cycle. The present invention solves the problem of flickering illumination light without affecting the original exposure and illumination synchronization functions, can improve user experience, ensure equipment reliability, extend equipment service life, and can save power and reduce use costs.

Description

Technical Field

[0001] The present invention relates to the field of machine vision technology, and in particular to a method and system for synchronously controlling illumination and exposure in a low frame rate mode. Background Art

[0002] The working principle of the machine vision system is to convert the captured target into an image signal through a machine vision product (image sensor), transmit it to a dedicated image processing system, obtain the morphological information of the captured target, and convert it into a digital signal based on pixel distribution, brightness, color and other information; the image system performs various operations on these signals to extract the characteristics of the target, and then controls the action of the equipment on site based on the results of the judgment. During the operation of machine vision systems such as barcode readers or cameras, they often need to be used in conjunction with lighting. In order to improve the efficiency of lighting and image quality, it is necessary to synchronize the driving of the lighting and the exposure of the image sensor, that is, the lighting and exposure are turned on in the same sequence.

[0003] In some application scenarios, the image sensor needs to maintain low frame rate mode, in which the illumination and exposure synchronization are still required. However, in this mode, the illumination frequency is low, which can easily cause the illumination to flicker, affecting the user experience. To solve this problem, the method of controlling the illumination to be always on is usually adopted. However, the illumination being always on will cause serious heating of the device, affecting the reliability and service life of the device. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art, and to propose a method and system for synchronous control of lighting and exposure in low frame rate mode, which solves the problem of lighting flickering without affecting the original exposure and lighting synchronization functions, improves user experience and ensures equipment reliability.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] According to a first aspect of the present invention, a method for synchronously controlling illumination and exposure in a low frame rate mode is provided. The method for synchronously controlling illumination and exposure in a low frame rate mode comprises:

[0007] Step S1: Setting the exposure interval T e , lighting frequency gain A, lighting duration t i , exposure duration t e ; Wherein, the lighting frequency gain A is a positive integer, and the lighting duration t i =Exposure duration t e .

[0008] Step S2: When each exposure is turned on, set A consecutive timing cycles, each timing cycle is At the beginning of the first timing cycle, the lighting and exposure are controlled to be turned on at the same time, and the lighting duration t i Or exposure duration t e After that, the lighting and exposure are controlled to be turned off simultaneously until the end of the first timing cycle; at the beginning of the i-th (i=2,3,…,A) timing cycle, the lighting is controlled to be turned on until the lighting duration t i After that, the lighting is controlled to be turned off until the end of the i-th timing cycle.

[0009] According to a second aspect of the present invention, there is provided a lighting and exposure synchronization control system in a low frame rate mode. The lighting and exposure synchronization control system in a low frame rate mode comprises a processing module, an image sensor, an exposure control module, a lighting module and a lighting control module, wherein the processing module is electrically connected to the exposure control module and the lighting control module respectively, the exposure control module is electrically connected to the image sensor, and the lighting control module is electrically connected to the lighting module.

[0010] The image sensor is used to turn on or off exposure according to a control instruction of the exposure control module.

[0011] The lighting module is used to turn on or off the lighting according to the control instruction of the lighting control module.

[0012] The processing module is used to: configure the exposure interval time T e , lighting frequency gain A, lighting duration t i , exposure duration t e ; Each time the exposure is turned on, set a continuous A timing cycle, each timing cycle is At the beginning of the first timing cycle, the lighting control module and the exposure control module are used to control the lighting and exposure to start simultaneously until the lighting duration t i Or exposure duration t e After that, the lighting control module and the exposure control module are used to control the lighting and exposure to be turned off simultaneously until the first timing cycle ends; at the beginning of the i-th (i=2, 3, ..., A) timing cycle, the lighting control module is used to control the lighting to be turned on until the lighting duration t i After that, the lighting is controlled to be turned off until the end of the i-th timing cycle.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: in the lighting and exposure synchronization control method and system in the low frame rate mode of the present invention, the problem of lighting light flickering is solved without affecting the original exposure and lighting synchronization functions, which can improve user experience, ensure equipment reliability, and extend equipment service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structure of a lighting and exposure synchronization control system in a low frame rate mode according to some embodiments of the present invention.

[0015] Figure 2 This is a timing diagram of exposure and illumination control in the prior art.

[0016] Figure 3 FIG. 4 is a timing diagram for controlling exposure and illumination in some embodiments of the present invention.

[0017] In the figure, 10 is a processing module, 20 is an image sensor, 30 is an exposure control module, 40 is an illumination module, and 50 is an illumination control module. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention. It can be understood that some technical means of the various embodiments described herein can be replaced or combined with each other without conflict.

[0019] In the description of the present invention, if there are terms such as "first", "second", etc., they are only used to distinguish the objects described, and do not have any order or technical meaning. Therefore, the objects defined as "first", "second", etc. may explicitly or implicitly include one or more of the objects. In addition, "one" or "a" and similar words do not indicate a quantity limitation, but indicate the existence of at least one, and "multiple" means not less than two.

[0020] In the description of the present specification, reference to "one embodiment" or "some embodiments" etc. means that one or more embodiments of the present invention include a specific feature, structure or characteristic described in conjunction with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0021] According to a first aspect of the present invention, a method for synchronously controlling illumination and exposure in a low frame rate mode is provided. In some embodiments, the method for synchronously controlling illumination and exposure in a low frame rate mode comprises:

[0022] Step S1: Setting the exposure interval T e, lighting frequency gain A, lighting duration t i , exposure duration t e ; Wherein, the lighting frequency gain A is a positive integer, and A≥2, and the lighting duration t i =Exposure duration t e .

[0023] Step S2: When each exposure is turned on, set A consecutive timing cycles, and the time of each timing cycle is At the beginning of the first timing cycle, the lighting and exposure are controlled to be turned on at the same time, and the lighting duration t i Or exposure duration t e After that, the lighting and exposure are controlled to be turned off simultaneously until the end of the first timing cycle; at the beginning of the i-th (i=2,3,…,A) timing cycle, the lighting is controlled to be turned on until the lighting duration t i After that, the lighting is controlled to be turned off until the end of the i-th timing cycle.

[0024] In the lighting and exposure synchronization control method in the low frame rate mode of the present invention, multiple timing cycles are set within the exposure interval to increase the lighting frequency exponentially. This solves the problem of lighting flickering without affecting the original exposure and lighting synchronization functions, improves user experience, ensures equipment reliability, extends equipment service life, and saves electricity and reduces usage costs.

[0025] It should be noted that the above exposure interval time T e , lighting frequency gain A, lighting duration t i , exposure duration t e It should be understood that, for rational considerations, the exposure interval T e >ΔT>Exposure duration t e = lighting duration t i .

[0026] Reference Figure 2 In the prior art, the control timing of exposure and lighting is completely consistent, that is, the exposure and lighting are completely synchronized. This will cause the lighting to flicker in light and dark, affecting the user experience.

[0027] In some embodiments of the present invention, the method for synchronously controlling illumination and exposure in a low frame rate mode includes:

[0028] Step S1: Setting the exposure interval T e , lighting frequency gain A, lighting duration t i , exposure duration t e ; Among them, the exposure interval time T e=33.34ms, corresponding to an exposure frame rate of 30fps; illumination frequency gain A = 2, illumination duration t i =Exposure duration t e .

[0029] Step S2: When each exposure is turned on, set two consecutive timing cycles, and the time of each timing cycle is At the beginning of the first timing cycle, the lighting and exposure are controlled to be turned on at the same time, and the lighting duration t i Or exposure duration t e After that, the lighting and exposure are controlled to be turned off simultaneously until the end of the first timing cycle; when the second timing cycle begins, the lighting is controlled to be turned on until the lighting duration t i After that, the lighting is controlled to be turned off until the end of the second timing cycle.

[0030] The timing diagram corresponding to the above control process is as follows Figure 3 It can be seen that the lighting frequency in the present invention is doubled, which solves the problem of lighting flickering without affecting the original exposure and lighting synchronization functions, can improve user experience, ensure equipment reliability, and extend equipment life. At the same time, there is no need to control the lighting to be always on, which can save electricity and reduce the cost of use.

[0031] According to a second aspect of the present invention, a lighting and exposure synchronization control system in a low frame rate mode is provided, which is used to implement the lighting and exposure synchronization control method in the low frame rate mode mentioned above, and solve the problem of light flickering in the low frame rate mode.

[0032] Reference Figure 1 In some embodiments, the lighting and exposure synchronization control system in the low frame rate mode includes a processing module 10, an image sensor 20, an exposure control module 30, a lighting module 40 and a lighting control module 50. The processing module 10 is electrically connected to the exposure control module 30 and the lighting control module 50 respectively, the exposure control module 30 is electrically connected to the image sensor 20, and the lighting control module 50 is electrically connected to the lighting module 40.

[0033] The image sensor 20 is used to turn on or off exposure according to a control instruction of the exposure control module 30 .

[0034] The lighting module 40 is used to turn on or off the lighting according to the control instruction of the lighting control module 50 .

[0035] The processing module 10 is used to: configure the exposure interval time T e , lighting frequency gain A, lighting duration t i , exposure duration t e ; Each time the exposure is turned on, set a continuous A timing cycle, each timing cycle is At the beginning of the first timing cycle, the lighting control module 50 and the exposure control module 30 control the lighting and exposure to start simultaneously, and the lighting duration t i Or exposure duration t e After that, the lighting control module 50 and the exposure control module 30 control the lighting and exposure to be turned off simultaneously until the end of the first timing cycle; at the beginning of the i-th (i=2, 3, ..., A) timing cycle, the lighting control module 50 controls the lighting to be turned on until the lighting duration t i After that, the lighting is controlled to be turned off until the end of the i-th timing cycle.

[0036] The above exposure interval time T e , lighting frequency gain A, lighting duration t i , exposure duration t e It should be understood that, for rational considerations, the exposure interval T e >ΔT>Exposure duration t e = lighting duration t i For example, in some embodiments, the exposure interval time T e =33.34ms, lighting frequency gain A=2, when each exposure is turned on, set 2 consecutive timing cycles, then the time of each timing cycle is

[0037] The lighting and exposure synchronization control method and system in the low frame rate mode of the present invention solves the problem of flickering of lighting lights without affecting the original exposure and lighting synchronization functions, can improve user experience, ensure equipment reliability, and extend equipment service life. At the same time, there is no need to control the lighting to be always on, which can save electricity and reduce usage costs.

[0038] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A method for synchronously controlling illumination and exposure in a low frame rate mode, characterized in that: The illumination and exposure synchronization control method in the low frame rate mode includes: Step S1: Setting the exposure interval T e , lighting frequency gain A, lighting duration t i , exposure duration t e ; Wherein, the lighting frequency gain A is a positive integer, and the lighting duration t i =Exposure duration t e ; Step S2: When each exposure is turned on, set A consecutive timing cycles, each timing cycle is At the beginning of the first timing cycle, the lighting and exposure are controlled to be turned on at the same time, and the lighting duration t i Or exposure duration t e After that, the lighting and exposure are controlled to be turned off simultaneously until the end of the first timing cycle; at the beginning of the i-th (i=2,3,…,A) timing cycle, the lighting is controlled to be turned on until the lighting duration t i After that, the lighting is controlled to be turned off until the end of the i-th timing cycle.

2. A lighting and exposure synchronization control system in a low frame rate mode, characterized in that: The illumination and exposure synchronization control system in the low frame rate mode comprises a processing module, an image sensor, an exposure control module, an illumination module and an illumination control module, wherein the processing module is electrically connected to the exposure control module and the illumination control module respectively, the exposure control module is electrically connected to the image sensor, and the illumination control module is electrically connected to the illumination module; The image sensor is used to turn on or off exposure according to the control instruction of the exposure control module; The lighting module is used to turn on or off the lighting according to the control instruction of the lighting control module; The processing module is used to: configure the exposure interval time T e , lighting frequency gain A, lighting duration t i , exposure duration t e ; Each time the exposure is turned on, set a continuous A timing cycle, each timing cycle is At the beginning of the first timing cycle, the lighting control module and the exposure control module are used to control the lighting and exposure to start simultaneously until the lighting duration t i Or exposure duration t e After that, the lighting control module and the exposure control module are used to control the lighting and exposure to be turned off simultaneously until the first timing cycle ends; at the beginning of the i-th (i=2, 3, ..., A) timing cycle, the lighting control module is used to control the lighting to be turned on until the lighting duration t i After that, the lighting is controlled to be turned off until the end of the i-th timing cycle.

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