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162 | % Created by LI Xu
% Version 1.0
% February 22, 2024
% If you have any question about this code,
% please do not hesitate to contact me via E-mail:
% jeremy456@163.com
% Blog:
% http://blog.sciencenet.cn/u/lixujeremy
clear;
clc;
timebegin=tic;
cur_data=date;
cur_time=fix(clock);
str1=sprintf('%s %.2d:%.2d:%.2d', cur_data, cur_time(4), cur_time(5), cur_time(6));
fprintf('Time Begin: ');
fprintf(str1);
fprintf('\n');
filename='wheat';
% Source Directory
SouDir='input';
% Destination Directory
DesDir='output';
files=dir(SouDir);
files=files(3:end);
for ii=1:numel(files)
% construct the input file path
filepath=fullfile(SouDir, files(ii).name);
[image, geo]=readgeoraster(filepath);
image=double(image);
try
info=geotiffinfo(filepath);
catch
info=georasterinfo(filepath);
end
Num_bands=size(image, 3);
if Num_bands==3
RGB=image;
else
RGB=zeros(size(image, 1), size(image, 2), 3);
RGB(:, :, 1)=image(:, :, 4);
RGB(:, :, 2)=image(:, :, 2);
RGB(:, :, 3)=image(:, :, 1);
end
% Normalise the RGB bands [0, 255]
RGB=GenNormalise(RGB);
% https://www.mathworks.com/help/images/understanding-color-spaces-and-color-space-conversion.html
xyz=rgb2xyz(RGB);
lab=rgb2lab(RGB);
ycbcr=rgb2ycbcr(RGB);
ntsc=rgb2ntsc(RGB);
HSV=rgb2hsv(RGB);
% ExG = 2 * G - R - B
ExG=2*RGB(:, :, 2)-RGB(:, :, 1)-RGB(:, :, 3);
otpath=strsplit(files(ii).name, '_');
otpath=otpath(2:end);
otpath=strjoin(otpath, '_');
otpath_rgb=[filename, '_rgb_', otpath];
otpath_hsv=[filename, '_hsv_', otpath];
otpath_xyz=[filename, '_xyz_', otpath];
otpath_lab=[filename, '_lab_', otpath];
otpath_ycbcr=[filename, '_ycbcr_', otpath];
otpath_ntsc=[filename, '_ntsc_', otpath];
otpath_exg=[filename, '_exG_', otpath];
otpath_rgb=fullfile(DesDir, otpath_rgb);
otpath_hsv=fullfile(DesDir, otpath_hsv);
otpath_xyz=fullfile(DesDir, otpath_xyz);
otpath_lab=fullfile(DesDir, otpath_lab);
otpath_ycbcr=fullfile(DesDir, otpath_ycbcr);
otpath_ntsc=fullfile(DesDir, otpath_ntsc);
otpath_exg=fullfile(DesDir, otpath_exg);
try
geotiffwrite(otpath_rgb, RGB, geo);
geotiffwrite(otpath_hsv, HSV, geo);
geotiffwrite(otpath_xyz, xyz, geo);
geotiffwrite(otpath_lab, lab, geo);
geotiffwrite(otpath_ycbcr, ycbcr, geo);
geotiffwrite(otpath_ntsc, ntsc, geo);
geotiffwrite(otpath_exg, ExG, geo);
catch
strcmd=['gdalinfo ', filepath];
[~, cmdout]=system(strcmd);
epsg=extractBetween(cmdout, "EPSG:"," got from GeoTIFF keys");
epsg=epsg{1};
% geotiffwrite(otpath, uint8(class_imag), geo, 'GeoKeyDirectoryTag', info.GeoTIFFTags.GeoKeyDirectoryTag);
geotiffwrite(otpath_rgb, RGB, geo, 'CoordRefSysCode', ['EPSG:', epsg], 'TiffType', 'bigtiff');
geotiffwrite(otpath_hsv, HSV, geo, 'CoordRefSysCode', ['EPSG:', epsg], 'TiffType', 'bigtiff');
geotiffwrite(otpath_xyz, xyz, geo, 'CoordRefSysCode', ['EPSG:', epsg], 'TiffType', 'bigtiff');
geotiffwrite(otpath_lab, lab, geo, 'CoordRefSysCode', ['EPSG:', epsg], 'TiffType', 'bigtiff');
geotiffwrite(otpath_ycbcr, ycbcr, geo, 'CoordRefSysCode', ['EPSG:', epsg], 'TiffType', 'bigtiff');
geotiffwrite(otpath_ntsc, ntsc, geo, 'CoordRefSysCode', ['EPSG:', epsg], 'TiffType', 'bigtiff');
geotiffwrite(otpath_exg, ExG, geo, 'CoordRefSysCode', ['EPSG:', epsg], 'TiffType', 'bigtiff');
end
disp(['[', num2str(ii), '/', num2str(numel(files)), ']~', files(ii).name]);
end
fprintf('Time Begin: ');
fprintf(str1);
fprintf('\n');
cur_data=date;
cur_time=fix(clock);
str2=sprintf('%s %.2d:%.2d:%.2d', cur_data, cur_time(4), cur_time(5), cur_time(6));
fprintf('Time End: ');
disp(str2);
timespan=toc(timebegin);
fprintf('Time Span: %.4f s\n', timespan);
disp('***********************************************');
function output=GenNormalise(input)
output=input*0;
for ii=1:size(input, 3)
image=input(:, :, ii);
% red_normalized = (red - red.min()) / (red.max() - red.min()) * 255
aa=image(:);
image_normalized=(image-min(aa))./(max(aa)-min(aa))*255.0;
output(:, :, ii)=image_normalized;
end
end
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