Plotting log file with matlab (bis)

[cobarcore]

[I cannot find anymore the original post "plotting log file with matlab", seems many old posts were removed from the forum??? So I re add this]

I submit, if anyone is interested, the code to plot LOG files generated by Magic Lantern Bulb Ramping function, in Matlab code. Thanks A1ex for original code in PY that I've adapted.

Code Select Expand

%% Viewer for Magic Lantern bulb ramping log file
% Adapted to Matlab by Cobarcore from original code by A1ex for PY
clear all; close all; home;

[fn,pn]=uigetfile('*.log','Select the file');
cd(pn);
f = fopen(fn);

Fs = [];
Es = [];
Esr = [];

Fb = [];
Eb = [];

F = [];
Y = [];
I=[];
S=[];

ep = 0;

while 1
    l = fgetl(f); % legge una linea
    if l==-1, break, end % fine del file, esco dal ciclo while
    m = regexp(l,'[0-9]+');
    if m>1, continue, end % se non trovo un numero di file img salto la riga
    file_number = str2double(l(1:4));
   
    [startIndex, endIndex, tokIndex, matchStr, tokenStr, exprNames, splitStr] = regexp(l,'.*shutter= *([0-9]+)ms');
    if isempty(tokenStr), continue, end
    shutter = max([cellfun(@str2double, tokenStr), 1/3]);

    [startIndex, endIndex, tokIndex, matchStr, tokenStr, exprNames, splitStr] = regexp(l,'.* iso= *([0-9]+)');
    if isempty(tokenStr), continue, end
    iso = cellfun(@str2double, tokenStr);

    [startIndex, endIndex, tokIndex, matchStr, tokenStr, exprNames, splitStr] = regexp(l,'.* y=([\- 0-9]+)');
    if isempty(tokenStr), continue, end
    y = cellfun(@str2double, strrep(tokenStr{1},' ',''));
   
    e = log2(shutter * iso/100);
    if ~exist('e0'), e0 = round(e); end

    if shutter < 100 & iso <= 200
        Fs=[Fs; file_number];
        Es=[Es; e-e0];
        Esr=[Esr; round(((e - e0)*4+0.5))/4];
    else
        Fb=[Fb; file_number];
        Eb=[Eb; e - e0];
    end
   
    F=[F; file_number];
    Y=[Y; ep - e0 - y/100];
    I=[I; iso];
    S=[S; shutter/1000];
    ep = e;
end
   
Y(1)=Y(2);

figure; subplot(3,1,1);
plot(Fs,Es,'r','linewidth',2), grid('on'), hold('on')
plot(Fb,Eb,'b','linewidth',2)
plot(F, Y, 'g','linewidth',2)
plot(Fs,Esr,'r','linewidth',2)
xlabel('Image number'); ylabel('Exposure value [EV]')
h=legend('Regular exposure (1/8 EV flicker)', 'Bulb exposure', 'Estimated scene exposure level','location','best'); set(h,'box','off');

subplot(3,1,2); plot(F,I,'linewidth',2), grid('on'), hold('on')
xlabel('Image number'); ylabel('ISO')

subplot(3,1,3); plot(F,S,'linewidth',2), grid('on'), hold('on')
xlabel('Image number'); ylabel('Exposure [s]')

saveas(gcf,strcat(fn(1:end-4),'_Graph.png'));



Example of generated plot: