我创建了一个简单的 GUI,当我按下按钮 (SAVE) 时,系统会获取一些字段的值,计算某个函数并将结果保存在数据结构中。我希望这个数据结构在程序外部,也就是说它保留在 Matlab 的出口处,并且在程序的下一次打开时,这个数据结构必须可用且可升级。
为此,我使用了一个data
在需要时保存和加载的全局变量。
问题是它不能正常工作,data
结构填充得很奇怪。
如您所见,在另一个中有一个结构,而不是元素列表。为什么?
我想要一个data
包含 n 个元素的结构(其中 n 是图像的数量),每个元素由 9 个字段(name
, category
, siftOctaves
, siftLevels
, siftPeak
, siftEdge
, numFeatures
, siftFeatures
, siftDescriptors
)组成。
这是一段代码:
%% SAVE BUTTON
function pushSiftSave_Callback(hObject, eventdata, handles)
% hObject handle to pushSiftSave (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global data;
try
% Vector of string = name of all possible images
imgs = createListOfImages('../img/');
% Get selected image
imgName = get(handles.listbox, 'Value');
imgPath = strcat('../img/', imgs(imgName));
imgPath = imgPath{1};
I_or = imread(imgPath);
I = single(rgb2gray(I_or));
% Get some parameters enter by user
[siftOctaves, siftLevels, siftPeak, siftEdge] = takeSiftParameters(handles.editSiftOctaves, handles.editSiftLevels, handles.editSiftPeakTh, handles.editSiftEdgeTh, I_or);
% Sift function
[f, d] = vl_sift(I, 'Octaves', siftOctaves, 'Levels', siftLevels, 'PeakThresh', siftPeak, 'EdgeThresh', siftEdge);
% Number of features
perm = randperm(size(f, 2));
numFeatures = size(perm, 2);
% Check if file exists
if exist('../data/data.mat', 'file') == 2
data = load('../data/data');
else
data = struct;
end
% Insert information in data structure
data = saveSiftInformation(data, imgs, imgPath, siftOctaves, siftLevels, siftPeak, siftEdge, f, d, numFeatures);
catch
ErrorMessage = lasterr;
msgbox(ErrorMessage);
disp(ErrorMessage);
end
function [data] = saveSiftInformation(data, imgs, imgPath, siftOctaves, siftLevels, siftPeak, siftEdge, features, descriptors, numFeatures)
imgPath = imgPath(8 : end);
% Find index of image
i = find((ismember(imgs, imgPath)));
% Update data structure
data(i).name = imgPath;
data(i).category = imgPath(1 : end-6);
data(i).siftOctaves = siftOctaves;
data(i).siftLevels = siftLevels;
data(i).siftPeak = siftPeak;
data(i).siftEdge = siftEdge;
data(i).numFeatures = numFeatures;
data(i).siftFeatures = features;
data(i).siftDescriptors = descriptors;
% Save data
save('../data/data', 'data');
end
%% SAVE & QUIT BUTTON.
function pushQuit_Callback(hObject, eventdata, handles)
% hObject handle to pushQuit (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global data;
assignin('base', 'data', data);
谢谢!