error: Reference to non-existent field 'opts'.

hello, error occurs when I run demo_im2mcg.m:

Reference to non-existent field 'opts'.

Error in edgesDetect (line 33)
opts=model.opts; opts.nTreesEval=min(opts.nTreesEval,opts.nTrees);

Error in img2ucms>img2ucm (line 91)
[E,~,O] = edgesDetect( I, model );

Error in img2ucms>img2ucm_scale (line 75)
[ucm2, times] = img2ucm(I, model, param.mult_Pb, param.sat_sPb, param.nvec, param.dthresh, param.ic_gamma);

Error in img2ucms (line 56)
    [ucms{s}, times] = img2ucm_scale(I, model, param);

Error in im2mcg (line 63)
    [ucm2] = img2ucms(image, sf_model, scales);

Error in demo_im2mcg (line 10)
[candidates_scg, ucm2_scg] = im2mcg(I,'fast');

demo_im2mcg.m is following:

%% Demo to show the results of MCG
clear all;close all;home;

% Read an input image
I = imread(fullfile(root_dir, 'demos','101087.jpg'));

tic;
% Test the 'fast' version, which takes around 5 seconds in mean
[candidates_scg, ucm2_scg] = im2mcg(I,'fast');
toc;

tic;
% Test the 'accurate' version, which tackes around 30 seconds in mean
[candidates_mcg, ucm2_mcg] = im2mcg(I,'accurate');
toc;

%% Show UCM results (dilated for visualization)
figure;
subplot(1,3,1)
imshow(I), title('Image')

subplot(1,3,2)
imshow(imdilate(ucm2_scg,strel(ones(3))),[]), title('Fast UCM (SCG)')

subplot(1,3,3)
imshow(imdilate(ucm2_mcg,strel(ones(3))),[]), title('Accurate UCM (MCG)')


%% Show Object Candidates results and bounding boxes
% Candidates in rank position 11 and 12
id1 = 11; id2 = 12;

% Get the masks from superpixels and labels
mask1 = ismember(candidates_mcg.superpixels, candidates_mcg.labels{id1});
mask2 = ismember(candidates_mcg.superpixels, candidates_mcg.labels{id2});

% Bboxes is a matrix that contains the four coordinates of the bounding box
% of each candidate in the form [up,left,down,right]. See folder bboxes for
% more function to work with them

% Show results
figure;
subplot(1,3,1)
imshow(I), title('Image')
subplot(1,3,2)
imshow(mask1), title('Candidate + Box')
hold on
plot([candidates_mcg.bboxes(id1,4) candidates_mcg.bboxes(id1,4) candidates_mcg.bboxes(id1,2) candidates_mcg.bboxes(id1,2) candidates_mcg.bboxes(id1,4)],...
     [candidates_mcg.bboxes(id1,3) candidates_mcg.bboxes(id1,1) candidates_mcg.bboxes(id1,1) candidates_mcg.bboxes(id1,3) candidates_mcg.bboxes(id1,3)],'r-')
subplot(1,3,3)
imshow(mask2), title('Candidate + Box')
hold on
plot([candidates_mcg.bboxes(id2,4) candidates_mcg.bboxes(id2,4) candidates_mcg.bboxes(id2,2) candidates_mcg.bboxes(id2,2) candidates_mcg.bboxes(id2,4)],...
     [candidates_mcg.bboxes(id2,3) candidates_mcg.bboxes(id2,1) candidates_mcg.bboxes(id2,1) candidates_mcg.bboxes(id2,3) candidates_mcg.bboxes(id2,3)],'r-')

edgesDetect function is following：

Copyright code removed, the function edgesDetect is available here:

https://www.mathworks.com/matlabcentral/fileexchange/56690-pdollar-edges

can anybody help to solve it? thank you !

[Adam Danz]

If you edit your question and format your code by selecting the code and using the [>] button, it will be much easier to read.

[Adam Danz]

I don't see where edgesDetect is being called or where the 2nd input 'model' is produced. Obviously 'model' should be a structure with a field "opts" and this variable is likely produced by another function but we don't see that part.

Answer 1

[Ridwan Alam]

Updated Solution:

inside im2mcg.m, (line 52)

sf_model = loadvar(fullfile(mcg_root, 'datasets', 'models', 'sf_modelFinal.mat'),'model');

change that to:

sf_model = load(fullfile(mcg_root, 'datasets', 'models', 'sf_modelFinal.mat'));
sf_model = sf_model.model;

%% old conversation

Can you double check your downloaded version of the model?

This one has model.opts:

https://github.com/hcrmines/apc/blob/master/MATLAB/extern/MCG-PreTrained/datasets/models/sf_modelFinal.mat

[shengzhou]

Thank you for your answer, but it still does not work. Both two models have model.opts, I'm not sure whether I did something when I run 'full' folder. Have you ever run the code of MCG and meet the same error? I will eally appreciate it if you can give me more advices.

[Ridwan Alam]

Sure. Unfortunately, I haven't. Sometimes it depends a lot on the installation process. I belive you have tried uninstalling and reinstalling the package.

But my two cents in this case would be to add a "breakpoint" in edgesDetect() before line with "opts=model.opts; opts.nTreesEval=min(opts.nTreesEval,opts.nTrees);". And double check if the model passed to this function has the "opts" property.

It's always a challenge to work with libraries like this. Sorry, the best I can do here is to help you debug.

[Ridwan Alam]

Just a hunch:

inside im2mcg.m, (line 52)

sf_model = loadvar(fullfile(mcg_root, 'datasets', 'models', 'sf_modelFinal.mat'),'model');

change that to:

sf_model = load(fullfile(mcg_root, 'datasets', 'models', 'sf_modelFinal.mat'));
sf_model = sf_model.model;

Please keep me informed how it goes.

[shengzhou]

I ever added a "breakpoint" in edgesDetect() before line with "opts=model.opts; opts.nTreesEval=min(opts.nTreesEval,opts.nTrees);". The model has been passed to this function and it should have the field 'opts', but it doesn't work.

[Ridwan Alam]

BINGO!!

you see it's not "model.opts", its "model.model.opts"

[Ridwan Alam]

Solution:

inside im2mcg.m, (line 52)

sf_model = loadvar(fullfile(mcg_root, 'datasets', 'models', 'sf_modelFinal.mat'),'model');

change that to:

sf_model = load(fullfile(mcg_root, 'datasets', 'models', 'sf_modelFinal.mat'));
sf_model = sf_model.model;

[shengzhou]

yes, it works! could you tell me why? Thank you.

[Ridwan Alam]

Because "loadvar" is obsolete. "load" is replacing "loadvar".

Please accept my response as an answer, and vote if you appreciate the help. Thanks!

[shengzhou]

ok, thank you so much.

[Adam Danz]

+1

nice persistence

[Ridwan Alam]

thanks :-)