CN111524489B - Ultrahigh frame frequency simulation method based on composite coding - Google Patents

Ultrahigh frame frequency simulation method based on composite coding Download PDF

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Publication number
CN111524489B
CN111524489B CN202010324627.8A CN202010324627A CN111524489B CN 111524489 B CN111524489 B CN 111524489B CN 202010324627 A CN202010324627 A CN 202010324627A CN 111524489 B CN111524489 B CN 111524489B
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light source
display time
bit plane
bit
code
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CN111524489A (en
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崔文楠
张涛
孙浩
刘石神
虞翔
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Shanghai Institute of Technical Physics of CAS
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Shanghai Institute of Technical Physics of CAS
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
    • G09G3/346—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on modulation of the reflection angle, e.g. micromirrors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The invention discloses a super high frame frequency simulation method based on composite coding, which is characterized in that for a bit plane with a total number of stages of N, a display time base number and the maximum brightness of a light source are determined, a display time code and a light source brightness code of pulse width modulation are determined according to the number of stages of the current bit plane, and continuous simulation is carried out according to a display flow based on the composite coding. The invention effectively solves the limitation of single pulse width modulation coding and simulator hardware response, further reduces the composite display base number by using the composite coding method, and can realize the optical simulation with ultrahigh frame frequency compared with the traditional method.

Description

Ultrahigh frame frequency simulation method based on composite coding
Technical Field
The invention relates to a DMD high-frame-frequency driving technology, in particular to an ultrahigh-frame-frequency simulation method based on composite coding, which is suitable for the field of optical simulation.
Background
With the continuous improvement of the detection requirement of the fast moving target, the requirement on the imaging time resolution ratio is higher and higher, when the optical semi-physical simulation is carried out, an optical simulation system with higher time resolution ratio is needed, and according to the nyquist theorem, the frame frequency of the simulation system is at least 2 times of the frame frequency of the imaging system, so that the research on the ultrahigh frame frequency optical simulation technology is necessary to be carried out.
A DMD partitioning dislocation PWM gray level modulation method is widely proposed, and the simulation frame frequency of 8-bit gray level images 464fps can be achieved. An alalia proposes a high-frame-rate dynamic simulation method based on fusion of a source bitmap and an inversion bitmap, and can realize a simulation frame rate of 8-bit gray level images 1000 fps.
The invention provides a light source and simulator composite coding technology, which can realize the simulation frequency of an 8-bit gray image 2400 fps. Because the simulation method is constrained by the hardware response of a simulator, the ultrahigh frame frequency simulation cannot be realized by single PWM (pulse-width modulation) coding, so that the composite coding technology combining high-speed LED brightness change and PWM modulation is provided, the hardware limit can be broken through, and the ultrahigh frame frequency optical simulation can be realized.
Disclosure of Invention
The invention discloses an ultrahigh frame frequency simulation method based on composite coding, which combines high-speed LED brightness coding and PWM modulation coding, overcomes the hardware limitation of a display time base number in single PWM coding, and meets the requirement of ultrahigh frame frequency simulation.
The method comprises the following specific steps:
1) determining the total number N of bit planes required by simulation according to the technical requirements of the system, wherein the value range of N is 8-16;
2) determining a display time base T according to the model and the working frequency of the core simulation device, wherein the value range of T is 8-40 mus;
3) determining the maximum brightness L of the light source according to the model of the light source and a driving circuit thereof, wherein the value range of L is 100 lm-2000 lm;
4) determining the display time code of the pulse width modulation, which comprises the following specific steps:
(1) rounding N/2 to M;
(2) for bit planes with the stage range of 1-M +1, the display time codes corresponding to the bit planes are all set to be 1;
(3) for the bit planes with the series range of M + 2-N, the display time code corresponding to the bit plane is set to be 2 K -(M+1) Wherein K is the number of levels of the current bit plane;
5) determining a light source brightness code, which comprises the following specific steps:
(1) for the bit plane with the stage number ranging from 1 to M, the light source brightness code corresponding to the bit plane is set to be 2 K -(M+1) ；
(2) For bit planes with the stage range of M + 1-N, light source brightness codes corresponding to the bit planes are all set to be 1;
6) the display process based on the composite coding comprises the following specific steps:
(1) reading an image, and converting the image into an N-level bit plane;
(2) loading bit planes in the order from 1 to N respectively;
(3) when the number of loaded bit plane stages is K, the display time corresponding to the bit plane is the display time base T multiplied by the display time code, the display time base T is determined according to the step 2), the display time code is determined according to the step 4), meanwhile, the light source brightness corresponding to the bit plane is the light source maximum brightness L multiplied by the light source brightness code, the light source maximum brightness L is determined according to the step 3), and the light source brightness code is determined according to the step 5);
(4) if continuous simulation is needed, (1) to (3) in the step 6) are repeated, otherwise, stopping.
The invention has the advantages that:
the invention effectively solves the limitation of single PWM coding and simulator hardware response, further reduces the composite display base number by using the composite coding method, and can realize the optical simulation with ultrahigh frame frequency compared with the traditional method.
Drawings
Fig. 1 is a basic block diagram of a simulation method based on composite coding.
Fig. 2 is a schematic diagram of 8-bit gray scale image composite encoding.
Detailed Description
The invention is described in detail below with reference to the following figures and examples:
1) taking an 8-bit gray image as an example, determining that the number of bit plane levels required by simulation is N-8;
2) taking a DMD model of 0.7XGA and a working frequency of 400MHz as an example, determining that a display time base T is 8 mus;
3) determining the maximum brightness 200lm of a light source according to a 10W high-power white LED and a driving circuit;
4) determining the display time code of the pulse width modulation, which comprises the following specific steps:
(1) rounding N/2 to obtain M-4;
(2) for bit planes with the progression range of 1-5, setting the display time codes corresponding to the bit planes as 1;
(3) for bit planes with the stage range of 6-8, setting display time codes corresponding to the bit planes as 2, 4 and 8 respectively;
5) determining a light source brightness code, which comprises the following specific steps:
(1) for bit planes with the number of stages ranging from 1 to 4, the light source brightness codes corresponding to the bit planes are respectively set to be 1/16, 1/8, 1/4 and 1/2;
(2) for bit planes with the stage range of 5-8, setting the light source brightness codes corresponding to the bit planes as 1;
6) the display process based on the composite coding comprises the following specific steps:
(1) reading an image, and converting the image into an 8-level bit plane;
(2) respectively loading bit planes from 1 to 8;
(3) the display time corresponding to the bit planes 1-8 is respectively 8 μ s, 8 μ s, 8 μ s, 8 μ s, 8 μ s, 16 μ s, 32 μ s and 64 μ s, and the light source brightness corresponding to the bit planes 1-8 is respectively 12.5lm, 25lm, 50lm, 100lm, 200lm, 200lm, 200lm and 200 lm;
(4) if continuous simulation is needed, repeating the steps (1) to (3) in the step 6), otherwise stopping.

Claims (1)

1. A super high frame frequency simulation method based on composite coding is characterized by comprising the following steps:
1) determining the total number N of bit planes required by simulation according to the technical requirements of a system, wherein the value range of N is 8-16;
2) determining a display time base T according to the model and the working frequency of the core simulation device, wherein the value range of T is 8-40 mus;
3) determining the maximum brightness L of the light source according to the model of the light source and a driving circuit thereof, wherein the value range of L is 100 lm-2000 lm;
4) determining the display time code of the pulse width modulation, which comprises the following specific steps:
(1) rounding N/2 to M;
(2) for bit planes with the stage range of 1-M +1, the display time codes corresponding to the bit planes are all set to be 1;
(3) for the bit planes with the progression range of M + 2-N, the display time code corresponding to the bit plane is set as 2 K-(M+1) Wherein K is the number of stages of the current bit plane;
5) determining a light source brightness code, which comprises the following specific steps:
(1) for the bit plane with the stage number ranging from 1 to M, the light source brightness code corresponding to the bit plane is set to be 2 K-(M+1) ；
(2) For bit planes with the stage range of M + 1-N, light source brightness codes corresponding to the bit planes are all set to be 1;
6) the display process based on the composite coding comprises the following specific steps:
(1) reading an image, and converting the image into an N-level bit plane;
(2) loading bit planes in the order from 1 to N respectively;
(3) when the loaded bit plane progression is K, the display time corresponding to the bit plane is determined by multiplying the display time base T by the display time code, the display time base T is determined according to the step 2), the display time code is determined according to the step 4), meanwhile, the light source brightness corresponding to the bit plane is determined by multiplying the light source maximum brightness L by the light source brightness code, the light source maximum brightness L is determined according to the step 3), and the light source brightness code is determined according to the step 5);
(4) and (4) if continuous simulation is required, repeating the steps (1) to (3) in the step 6), and otherwise, stopping.
CN202010324627.8A 2020-04-23 2020-04-23 Ultrahigh frame frequency simulation method based on composite coding Active CN111524489B (en)

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CN103430553A (en) * 2011-03-14 2013-12-04 杜比实验室特许公司 Local dimming of a laser light source for projectors and other lighting devices including cinema, entertainment systems, and displays
CN104168430A (en) * 2014-08-18 2014-11-26 西安电子科技大学 TDI CCD focal plane coding super-resolution imaging device and method
CN104917977A (en) * 2015-06-02 2015-09-16 中国科学院上海技术物理研究所 Method for driving DMD (digital micromirror device) to display high-dynamic image in ultrahigh-frame frequency manner
CN106663408A (en) * 2014-08-21 2017-05-10 杜比实验室特许公司 Techniques for dual modulation with light conversion

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US8274525B2 (en) * 2006-10-12 2012-09-25 TP Vision Holding, B.V. Converting color primaries and luminances of an input signalt to different color primaries and luminances for a display

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
CN102177529A (en) * 2008-10-14 2011-09-07 杜比实验室特许公司 Backlight simulation at reduced resolutions to determine spatial modulation of light for high dynamic range images
CN103430553A (en) * 2011-03-14 2013-12-04 杜比实验室特许公司 Local dimming of a laser light source for projectors and other lighting devices including cinema, entertainment systems, and displays
CN104168430A (en) * 2014-08-18 2014-11-26 西安电子科技大学 TDI CCD focal plane coding super-resolution imaging device and method
CN106663408A (en) * 2014-08-21 2017-05-10 杜比实验室特许公司 Techniques for dual modulation with light conversion
CN104917977A (en) * 2015-06-02 2015-09-16 中国科学院上海技术物理研究所 Method for driving DMD (digital micromirror device) to display high-dynamic image in ultrahigh-frame frequency manner

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