CN114449256B - Method for detecting delay of high-speed response DMD display system - Google Patents
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Abstract
The invention discloses a method and a system for detecting delay of a high-speed response DMD display system, which are characterized in that an industrial camera is utilized to synchronously send a trigger signal to a DMD driver and a computer serial port before each exposure, when the computer serial port receives the trigger signal, a computer is utilized to send preset dot position data to the DMD driver, so that the DMD driver module drives the DMD display module to display a frame of cut dot picture, the industrial camera is utilized to shoot the dot picture which is cut each time, the dot image which is shot each time by the industrial camera is acquired, a dot image set is formed, the dot image set is fitted into a first sine waveform, a second sine waveform is drawn according to the dot position data, and the integral delay time of the DMD display module is obtained based on the phase difference of the first sine waveform and the second sine waveform. The method and the system provided by the invention can accurately measure the overall delay time of the DMD, and effectively verify the real-time performance of the high-speed response DMD display module.
Description
Technical Field
The invention relates to the field of optical detection, in particular to a method and a system for detecting delay of a high-speed response DMD display system.
Background
DMD (Digital Micromirror Device digital micromirror element) is a commonly used spatial light modulator for optically guided controlled semi-physical simulation systems. There is typically an unstable delay of 2-3 frames from the image computer image calculation generation to the DMD completing the optical signal conversion. In order to improve the real-time performance of the simulation system, a high-speed response DMD display module is developed. How to detect the whole delay of the display module and the system, a method and a system for detecting the delay of the high-speed response DMD display system are needed to be designed so as to accurately measure the whole delay of the DMD.
Disclosure of Invention
The invention aims to provide a method and a system for detecting the delay of a high-speed response DMD display system, so as to detect the overall delay time of the high-speed response DMD display module.
In order to solve the technical problems, the invention provides a method for detecting the delay of a high-speed response DMD display system, which comprises the following steps:
providing a light source for the DMD display module by using an illumination light source;
the industrial camera is utilized to synchronously send a trigger signal to the DMD driving module and the serial port of the computer before each exposure;
when the serial port of the computer receives the trigger signal, the computer is used for sending preset dot position data to the DMD driving module, so that the DMD driving module drives the DMD display module to display a frame of cut dot picture;
shooting the round dot picture cut each time by using an industrial camera, and collecting round dot images shot each time by the industrial camera to form a round dot image set;
fitting the dot image set to a first sinusoidal waveform using a digital image processing method;
drawing a second sine waveform according to the dot position data;
and obtaining the overall delay time of the DMD display module based on the phase difference of the first sinusoidal waveform and the second sinusoidal waveform.
Preferably, the industrial camera acquisition frequency is set according to the highest frame frequency of the DMD display module.
Preferably, the deriving the overall delay time of the DMD display module based on the phase difference between the first sinusoidal waveform and the second sinusoidal waveform includes:
performing equal-proportion stretching on the second sinusoidal waveform so that the amplitude of the second sinusoidal waveform is equal to that of the first sinusoidal waveform;
and calculating the phase difference between the stretched second sinusoidal waveform and the first sinusoidal waveform to obtain the integral delay time of the DMD display module.
Preferably, the calculating the phase difference between the stretched second sinusoidal waveform and the first sinusoidal waveform includes:
and taking a group of local peaks of the first sinusoidal waveform and the second sinusoidal waveform, and calculating the local peak phase difference, wherein the local peak phase difference is the integral delay time of the DMD display module.
Preferably, the capturing the dot image captured by the industrial camera each time, and forming the dot image set includes:
and setting the number of times of dot image acquisition based on a preset first sine waveform period to form the dot image set.
Preferably, said fitting said set of dot images to a first sinusoidal waveform using digital image processing means comprises:
the digital image processing method converts the frequency domain signal into a time domain signal and fits a sine waveform.
The invention also provides a system for detecting the delay of the high-speed response DMD display system, which comprises:
the illumination light source is used for providing a light source for the DMD display module;
the industrial camera is used for presetting acquisition frequency at each interval, sending a trigger signal to the DMD driver and the serial port of the computer, and acquiring the dot images displayed by the DMD display module for a plurality of times to form a dot image set;
the computer is used for sending preset dot position data to the DMD driving module after the serial port of the computer receives the trigger signal; drawing a second sine waveform according to the dot position data; fitting a first sinusoidal waveform according to the dot image set, and obtaining the overall delay time of the DMD display module based on the phase difference of the first sinusoidal waveform and the second sinusoidal waveform;
the DMD driving module is used for driving the DMD display module to display dot images according to the position data;
and the DMD display module is used for displaying a frame dot image when the DMD drive is triggered once.
Preferably, a video output port in the DMD display module is connected to a computer through an HDMI video line; the serial port in the DMD drive module is connected to a computer through a data line; the industrial camera trigger line is connected into a DMD driver.
Preferably, the industrial camera sends a trigger signal to the DMD driving module synchronously with the serial port of the computer before each exposure, and the acquisition frequency of the industrial camera corresponds to the highest frame frequency of the DMD display module.
Preferably, the computer comprises:
the data transmission module is used for transmitting the dot position data to the DMD driving module;
the image processing module is used for carrying out equal proportion stretching on the second sinusoidal waveform so that the amplitude of the second sinusoidal waveform is equal to that of the first sinusoidal waveform;
and the data processing module is used for calculating the phase difference between the stretched second sinusoidal waveform and the first sinusoidal waveform to obtain the integral delay time of the DMD display module.
According to the method and the system for detecting the delay of the high-speed response DMD display system, provided by the invention, the industrial camera is utilized to synchronously send the trigger signal to the DMD drive module and the serial port of the computer before each exposure, so that the first sinusoidal waveform and the second sinusoidal waveform are ensured to be at the same time starting point, and when the serial port of the computer receives the trigger signal, the computer is utilized to send preset dot position data to the DMD drive module, so that the DMD drive module drives the DMD display module to display a frame of cut dot picture; and fitting the dot image set into a first sinusoidal waveform by using a digital image processing method, drawing a second sinusoidal waveform according to the dot position data, and obtaining the integral delay time based on the phase difference of the first sinusoidal waveform and the second sinusoidal waveform, thereby realizing accurate measurement of the integral delay time of the DMD.
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For a clearer description of embodiments of the invention or of the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a method for detecting a delay of a high-speed response DMD display system according to a first embodiment of the present invention;
FIG. 2 is a flowchart of a method for detecting a delay of a high-speed response DMD display system according to a second embodiment of the present invention;
FIG. 3 is a flowchart of a delay system for detecting a high-speed response DMD display system according to the present invention;
FIG. 4 is an industrial camera configuration image;
fig. 5 is a diagram of an image 3840×2160 of a DMD display module;
FIG. 6 is a software interface image of a computer sending dot location data;
FIG. 7 is a spot image acquired by an industrial camera;
FIG. 8 is a computer-fitted sinusoidal waveform image;
FIG. 9 is a plot of overall delay time image for dot locations;
FIG. 10 is a plot of overall time delay for a stretched position of a second sinusoidal waveform;
FIG. 11 is a set of peak delay diagrams for a first sinusoidal waveform and a stretched second sinusoidal waveform.
Detailed Description
The invention provides a method and a system for detecting the delay of a high-speed response DMD display system, wherein the dot image set is fitted into a first sinusoidal waveform, a second sinusoidal waveform is drawn according to dot position data, and the integral delay time of the DMD display module is obtained based on the phase difference of the first sinusoidal waveform and the second sinusoidal waveform, so that the integral delay time of the DMD display module is accurately measured.
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a flowchart of a first embodiment of a method for detecting a delay of a DMD display system with high-speed response according to the present invention; the specific operation steps are as follows:
step S101: providing a light source for the DMD display module by using an illumination light source;
step S102: the industrial camera is utilized to synchronously send a trigger signal to the DMD driving module and the serial port of the computer before each exposure;
step S103: when the serial port of the computer receives the trigger signal, the computer is used for sending preset dot position data to the DMD driving module, so that the DMD driving module drives the DMD display module to display a frame of cut dot picture;
step S104: shooting the round dot picture cut each time by using an industrial camera, and collecting round dot images shot each time by the industrial camera to form a round dot image set;
step S105: fitting the dot image set to a first sinusoidal waveform using a digital image processing method;
step S106: drawing a second sine waveform according to the dot position data;
step S107: and obtaining the overall delay time of the DMD display module based on the phase difference of the first sinusoidal waveform and the second sinusoidal waveform.
According to the detection method for the DMD driving delay, the integral delay time of the DMD display module is obtained through the phase difference between the first sinusoidal waveform and the second sinusoidal waveform, and the real-time performance of accurately measuring the high-speed response DMD display module is achieved.
Referring to fig. 2, fig. 2 is a flowchart of a second embodiment of a method for detecting a delay of a DMD display system with high-speed response according to the present invention; the specific operation steps are as follows:
as shown in fig. 3, a high-speed response DMD display system delay system workflow diagram is detected;
step S201: powering on the system, opening the industrial camera, and adjusting the data configuration of the system;
connecting a video output port in the DMD drive module to a computer through an HDMI video line;
connecting a serial port in the DMD drive module to a computer through a USB3.0 data line;
the DMD lighting module is connected to a constant current power supply with the voltage of 3.6V and the current of 6.5A;
connecting a trigger line of the industrial camera into the DMD driver;
as shown in fig. 4, the industrial camera configures an image;
the camera exposure time was adjusted to 59 μs (minimum exposure time), the frame rate was adjusted to 66.67HZ, and the IO signal was configured. The IO signal channel is Line1 matched with the wiring, the type is Strobe signal, a trigger signal is sent out instantaneously before the exposure of the camera, and the duration of the signal is 10 mu s;
step S202: drawing a 3840 x 2160 image by drawing software, drawing a white light spot at the center, setting the white light spot as a desktop background, and setting a multi-display as expansion;
as shown in fig. 5, a DMD display module is provided with 3840×2160 images;
step S203: opening sine signal testing software, selecting a corresponding COM port, clicking on 'open', selecting 'sine', and setting the starting point coordinates as follows: x=960, y=450, click "send data", the serial port is in waiting to send the state, when the serial port receives the trigger signal, begin sending the position data;
as shown in fig. 6, the computer sends a software interface image of dot position data;
step S204: opening sine signal testing software, clicking a center to acquire, continuously acquiring 200 pictures by an industrial camera at a frame rate of 66.67HZ, and synchronously transmitting IO signals to a serial port and a DMD driver before each acquisition exposure;
as shown in fig. 7, the spot image acquired by the industrial camera;
step S205: clicking waveform fitting, extracting the central coordinates of the light spots through a digital image processing algorithm, and fitting the central coordinates into a first sine waveform;
as shown in fig. 8, the computer fits the sine wave image;
step S206: clicking 'delay calculation', drawing a second sinusoidal waveform by using dot position data triggered by the serial port, wherein the amplitude of the acquired waveform is 1.8 times of that of the original waveform due to the parameter of the camera;
as shown in fig. 9, the dot positions are integrally delayed in time image;
step S207: the amplitude of the second sinusoidal waveform is subjected to equal proportion stretching;
as shown in fig. 10, the second sine waveform stretched position overall time-lapse image;
step S208: any one group of local wave peaks of the first sinusoidal waveform and the second sinusoidal waveform is taken, and the phase difference between the stretched second sinusoidal waveform and the first sinusoidal waveform is calculated, wherein the phase difference is the integral delay time;
as shown in fig. 11, a set of peak delay diagrams in the first sinusoidal waveform and the stretched second sinusoidal waveform;
according to the method for detecting the delay of the high-speed response DMD display system, the industrial camera is utilized to synchronously send the trigger signal to the DMD drive module and the serial port of the computer before each exposure, so that the first sinusoidal waveform and the second sinusoidal waveform are guaranteed to be at the same time starting point, when the serial port of the computer receives the trigger signal, the computer is utilized to send preset dot position data to the DMD drive module, and the DMD drive module is enabled to drive the DMD display module to display a frame of cut dot picture; according to the invention, the acquisition frequency of the industrial camera is set according to the highest frame frequency of the DMD display module, so that the acquisition frequency of the industrial camera is maximized, the error of a DMD drive delay detection method is shortened, a digital image processing method is utilized to fit the dot image set into a first sinusoidal waveform, a second sinusoidal waveform is drawn according to the dot position data, the integral delay time can be obtained based on the phase difference of the first sinusoidal waveform and the second sinusoidal waveform, the integral delay time of the DMD is accurately measured, and the real-time performance of the high-speed response DMD display module is effectively verified.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The method and the system for detecting the delay of the high-speed response DMD display system provided by the invention are described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (9)
1. A method for detecting a delay in a high-speed-response DMD display system, comprising:
providing a light source for the DMD display module by using an illumination light source;
the industrial camera is utilized to synchronously send a trigger signal to the DMD driving module and the serial port of the computer before each exposure;
when the serial port of the computer receives the trigger signal, the computer is used for sending preset dot position data to the DMD driving module, so that the DMD driving module drives the DMD display module to display a frame of cut dot picture;
shooting the round dot picture cut each time by using an industrial camera, and collecting round dot images shot each time by the industrial camera to form a round dot image set;
fitting the dot image set to a first sinusoidal waveform using a digital image processing method;
drawing a second sine waveform according to the dot position data;
and obtaining the overall delay time of the DMD display module based on the phase difference of the first sinusoidal waveform and the second sinusoidal waveform.
2. The method of detecting a high-speed response DMD display system latency of claim 1, wherein the industrial camera acquisition frequency is set according to a highest frame rate of the DMD display module.
3. The method of detecting a high-speed response DMD display system latency of claim 1, wherein deriving an overall latency time for the DMD display module based on a phase difference of the first sinusoidal waveform and the second sinusoidal waveform comprises:
performing equal-proportion stretching on the second sinusoidal waveform so that the amplitude of the second sinusoidal waveform is equal to that of the first sinusoidal waveform;
and calculating the phase difference between the stretched second sinusoidal waveform and the first sinusoidal waveform to obtain the integral delay time of the DMD display module.
4. A method of detecting a high speed response DMD display system delay as recited in claim 3 wherein said calculating a phase difference of said stretched second sinusoidal waveform from said first sinusoidal waveform comprises:
and taking a group of local peaks of the first sinusoidal waveform and the second sinusoidal waveform, and calculating the local peak phase difference, wherein the local peak phase difference is the integral delay time of the DMD display module.
5. The method of detecting a time delay of a high speed response DMD display system of claim 1, wherein said capturing dot images of each shot by said industrial camera to form a set of dot images comprises:
and setting the number of times of dot image acquisition based on a preset first sine waveform period to form the dot image set.
6. A system for detecting a delay in a high-speed-response DMD display system, comprising:
the illumination light source is used for providing a light source for the DMD display module;
the industrial camera is used for presetting acquisition frequency at each interval, sending a trigger signal to the DMD driver and the serial port of the computer, and acquiring the dot images displayed by the DMD display module for a plurality of times to form a dot image set;
the computer is used for sending preset dot position data to the DMD driving module after the serial port of the computer receives the trigger signal; drawing a second sine waveform according to the dot position data; fitting a first sinusoidal waveform according to the dot image set, and obtaining the overall delay time of the DMD display module based on the phase difference of the first sinusoidal waveform and the second sinusoidal waveform;
the DMD driving module is used for driving the DMD display module to display dot images according to the position data;
and the DMD display module is used for displaying a frame dot image when the DMD drive is triggered once.
7. A system for detecting a high-speed response DMD display system delay as recited in claim 6, comprising:
the video output port in the DMD display module is connected to a computer through an HDMI video line; the serial port in the DMD drive module is connected to a computer through a data line; the industrial camera trigger line is connected into a DMD driver.
8. The system for detecting latency of a high-speed response DMD display system of claim 6, wherein the industrial camera sends a trigger signal to a DMD driver module in synchronization with a computer serial port before each exposure and the industrial camera acquisition frequency corresponds to a highest frame rate of the DMD display module.
9. The system for detecting a high-speed response DMD display system delay as recited in claim 6 wherein said computer comprises:
the data transmission module is used for transmitting the dot position data to the DMD driving module;
the image processing module is used for carrying out equal proportion stretching on the second sinusoidal waveform so that the amplitude of the second sinusoidal waveform is equal to that of the first sinusoidal waveform;
and the data processing module is used for calculating the phase difference between the stretched second sinusoidal waveform and the first sinusoidal waveform to obtain the integral delay time of the DMD display module.
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| CN103402060B (en) * | 2013-08-14 | 2016-08-10 | 中国科学院长春光学精密机械与物理研究所 | DMD gray scale scene player and the synchronous method of image capturing system |
| CN104301707B (en) * | 2014-10-22 | 2016-07-06 | 中国科学院合肥物质科学研究院 | Depth image acquisition device and method based on DMD scanning and integrated phase shift range finding |
| CN105578179B (en) * | 2016-01-04 | 2018-11-13 | 厦门理工学院 | The system and method for detecting DMD display frame rates |
| CN108806575A (en) * | 2018-05-25 | 2018-11-13 | 厦门理工学院 | A kind of realization DMD superelevation frame per second grey scale display systems and display methods |
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| JP2017004003A (en) * | 2016-08-23 | 2017-01-05 | セイコーエプソン株式会社 | Shutter time lag measurement method, shutter time lag measurement display device and manufacturing method for camera |
| JP2018022186A (en) * | 2017-10-25 | 2018-02-08 | セイコーエプソン株式会社 | Display delay measuring method and display delay measuring system |
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