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how to give a triggers to 4 different cameras

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Jungkeuk Park
Jungkeuk Park el 24 de Ag. de 2019
Respondida: Shadaab Siddiqie el 27 de Jul. de 2021
I am using matlab to obtain images from 4 JAI CCD cameras(1 color, 2 mono, 1 uv).
Matlab code sets exposure time to cameras with pulse generation and grab images by external trigger.
The problem is when I take a picture, the trigger time is quiet different.
For example, the trigger times are 1)17:51:24.41 2)17:51:26:43 3)17:51:26.47 4) 17:51:28.40
Time gaps are 1-2) 2.03 sec, 2-3)0.04sec, 3-4) 1.53sec, 1-4) 3.59sec.
And camera triggering order is different. It is once 1)camera #1, 2)camera #3, 3)camera #4 and 4) camera #2
and then 1)camera #4, 2)camera #1, 3) camera #2 and 4) camera #4.
Please tell me how to syncronize the trigger time for 4 cameras and control triggering order. Thank you for an advice in advance.
Here is the matlab code I use:
clc; clear all; close all;
prompt = {'Exposure_color (ms):','Exposure_UV (ms):'...
,'Exposure_BW1 (ms):','Exposure_BW2 (ms):'};
title = 'Exposure time';
dims = [1 35];
definput = {'25','12','5','5'};
answer = inputdlg(prompt,title,dims,definput);
v_bw1 = videoinput('gige',3,'Mono8'); %ch.1~4
v_uv = videoinput('gige',4,'Mono8');
v_color = videoinput('gige',1,'BayerRG8');
v_bw2 = videoinput('gige',2,'Mono8');
s1 = v_bw1.Source;
s2 = v_uv.Source;
s3 = v_color.Source;
v_color.ReturnedColorspace = 'grayscale';
s4 = v_bw2.Source;
% Specify total number of frames to be acquired
% One frame is acquired for each external signal pulse.
numFrames = 1; % Enter the number of frame
% BW1
s1.PulseGeneratorSelector = 'PulseGenerator1';
s1.PulseGeneratorClearActivation = 'RisingEdge';
s1.PulseGeneratorClearInverter = 'False';
s1.PulseGeneratorClearSource = 'Line5';
s1.PulseGeneratorClock = 0.446428571428571;
%s1.PulseGeneratorFrequency = 0.500000080000013;
% s1.PulseGeneratorLengthMs = 1.1*str2num(answer{3});
s1.PulseGeneratorLengthMs = 2000;
s1.PulseGeneratorStartPoint = 1;
s1.PulseGeneratorEndPointMs = str2num(answer{3}); % exposure time (ms)
% UV
s2.PulseGeneratorSelector = 'PulseGenerator1';
s2.PulseGeneratorClearActivation = 'RisingEdge';
s2.PulseGeneratorClearInverter = 'False';
s2.PulseGeneratorClearSource = 'Line5';
s2.PulseGeneratorClock = 0.446428571428571;
%s2.PulseGeneratorFrequency = 0.500000080000013;
% s2.PulseGeneratorLengthMs = 1.1*str2num(answer{2});
s2.PulseGeneratorLengthMs = 2000;
s2.PulseGeneratorStartPoint = 1;
s2.PulseGeneratorEndPointMs = str2num(answer{2}); % exposure time (ms)
% Color
s3.PulseGeneratorSelector = 'PulseGenerator1';
s3.PulseGeneratorClearActivation = 'RisingEdge';
s3.PulseGeneratorClearInverter = 'False';
s3.PulseGeneratorClearSource = 'Line5';
s3.PulseGeneratorClock = 0.446428571428571;
%s3.PulseGeneratorFrequency = 0.500000080000013;
%s3.PulseGeneratorLengthMs = 1.1*str2num(answer{1});
s3.PulseGeneratorLengthMs = 2000;
s3.PulseGeneratorStartPoint = 1;
s3.PulseGeneratorEndPointMs = str2num(answer{1}); % exposure time (ms)
% BW2
s4.PulseGeneratorSelector = 'PulseGenerator1';
s4.PulseGeneratorClearActivation = 'RisingEdge';
s4.PulseGeneratorClearInverter = 'False';
s4.PulseGeneratorClearSource = 'Line5';
s4.PulseGeneratorClock = 0.446428571428571;
%s4.PulseGeneratorFrequency = 0.500000080000013;
% s4.PulseGeneratorLengthMs = 1.1*str2num(answer{4});
s4.PulseGeneratorLengthMs = 2000;
s4.PulseGeneratorStartPoint = 1;
s4.PulseGeneratorEndPointMs = str2num(answer{4}); % exposure time (ms)
v_bw1.FramesPerTrigger = 1;
v_uv.FramesPerTrigger = 1;
v_color.FramesPerTrigger = 1;
v_bw2.FramesPerTrigger = 1;
v_bw1.TriggerRepeat = 0;
v_uv.TriggerRepeat = 0;
v_color.TriggerRepeat = 0;
v_bw2.TriggerRepeat = 0;
% Specify 'hardware' videoinput trigger type
triggerconfig(v_bw1, 'hardware', 'DeviceSpecific', 'DeviceSpecific');
triggerconfig(v_uv, 'hardware', 'DeviceSpecific', 'DeviceSpecific');
triggerconfig(v_color, 'hardware', 'DeviceSpecific', 'DeviceSpecific');
triggerconfig(v_bw2, 'hardware', 'DeviceSpecific', 'DeviceSpecific');
s1.TriggerSelector = 'FrameStart';
s2.TriggerSelector = 'FrameStart';
s3.TriggerSelector = 'FrameStart';
s4.TriggerSelector = 'FrameStart';
s1.TriggerSource = 'PulseGenerator1';
s2.TriggerSource = 'PulseGenerator1';
s3.TriggerSource = 'PulseGenerator1';
s4.TriggerSource = 'PulseGenerator1';
s1.TriggerActivation = 'RisingEdge';
s2.TriggerActivation = 'RisingEdge';
s3.TriggerActivation = 'RisingEdge';
s4.TriggerActivation = 'RisingEdge';
s1.TriggerMode = 'on';
s2.TriggerMode = 'on';
s3.TriggerMode = 'on';
s4.TriggerMode = 'on';
s1.GainRaw = 336;
s2.GainRaw = 336;
s3.GainRaw = 100;
s4.GainRaw = 336;
% For exposure time control configure a TriggerWidth exposure mode
s1.ExposureMode = 'TriggerWidth';
s2.ExposureMode = 'TriggerWidth';
s3.ExposureMode = 'TriggerWidth';
s4.ExposureMode = 'TriggerWidth';
answer = questdlg('Take a shot?','Take a shot','Shot','No','Shot');% Start hardware-triggered buffered continuous acquisition, and wait for
% acquisition to complete
start([v_bw1 v_uv v_color v_bw2])
wait([v_bw1 v_uv v_color v_bw2], 100)
% wait(v_uv, 5)
% wait(v_bw1, 5)
% wait(v_bw2, 5)
% Eventlog
elog_color = v_color.EventLog;
elog_uv = v_uv.EventLog;
elog_bw1 = v_bw1.EventLog;
elog_bw2 = v_bw2.EventLog;
elog_bw1(1).Data
elog_uv(1).Data
elog_color(1).Data
elog_bw2(1).Data
elog_bw1(2).Data
elog_uv(2).Data
elog_color(2).Data
elog_bw2(2).Data
fn_color=mat2str(elog_color(2).Data.AbsTime);
fn_uv=mat2str(elog_uv(2).Data.AbsTime);
fn_bw1=mat2str(elog_bw1(2).Data.AbsTime);
fn_bw2=mat2str(elog_bw2(2).Data.AbsTime);
% Transfer acquired frames and timestamps from acquisition input buffer
% into workspace
data_color = getdata(v_color, v_color.FramesAvailable);
data_uv = getdata(v_uv, v_uv.FramesAvailable);
data_bw1 = getdata(v_bw1, v_bw1.FramesAvailable);
data_bw2 = getdata(v_bw2, v_bw2.FramesAvailable);
vid_bw1Image=imrotate(data_bw1,-90); % image processing
vid_bw2Image=imrotate(data_bw2,90);
vid_colorImage=imrotate(data_color,-90);
vid_uvImage=imrotate(data_uv,90);
% vid_colorImage = imadjust(vid_colorImage,[0 0 0;0.706 1 0.706],[]);
vid_colorImage=demosaic(vid_colorImage, 'grbg');
DIRNAME1 = datestr(now,'yyyymmdd'); % create folders
DIRNAME2 = datestr(now,'HHMMSS');
mkdir(DIRNAME1, DIRNAME2);
pathname = ['C:\Users\admin\Documents\gyujin\code','\',DIRNAME1,'\',DIRNAME2,'\'];
mkdir(pathname);
imwrite(vid_bw1Image,[pathname,fn_bw1,'bw1.jpg']); % save images
imwrite(vid_bw2Image,[pathname,fn_bw2, 'bw2.jpg']);
imwrite(vid_uvImage,[pathname,fn_uv,'uv.jpg']);
imwrite(vid_colorImage,[pathname,fn_color,'color.jpg']);
delete(v_color);
delete(v_uv);
delete(v_bw1);
delete(v_bw2);
clear v_color;
clear v_uv;
clear v_bw1;
clear v_bw2;

Respuestas (1)

Shadaab Siddiqie
Shadaab Siddiqie el 27 de Jul. de 2021
Form my understanding you want to trigger multiple cameras based on some conditions. You can do something like this.
%Configure camera for FrameStart trigger mode and specify external triggering signal input line and desired trigger condition.
% TriggerMode to 'on') applies only to the specified trigger mode (FrameStart).
s.TriggerSelector = 'FrameStart';
s.TriggerSource = 'Line1';
s.TriggerActivation = 'RisingEdge';
s.TriggerMode = 'on';
% Specify a constant exposure time for each frame
s.ExposureMode = 'Timed';
s.ExposureTimeAbs = 4000;
% Start hardware-triggered buffered continuous acquisition, and wait for acquisition to complete
start(v)
wait(v, 10)
% Transfer acquired frames and timestamps from acquisition input buffer into workspace
[data2, ts2] = getdata(v, v.FramesAvailable);

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