How to removed the ??? Reference to non-existent field error

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Sanjay Saini 2014-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/128871-how-to-removed-the-reference-to-non-existent-field-error

评论： Sanjay Saini 2014-5-9

采纳的回答： Image Analyst

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function bgs = ComputeSilhouettes_ABC2(frame,img)

global PRM; persistent BG_STATS LAST_SEQ;

if isempty(LAST_SEQ), LAST_SEQ = -1; end

if PRM.SEQ ~= LAST_SEQ fprintf('Loading background statistics '); tic;

    SN  = get(PRM.datasetObj,'SubjectName'); SN = SN{1};
    global ABC2_DATASET_BASE_PATH;
    bgModelPath = [ABC2_DATASET_BASE_PATH '/' SN ...
        '/Background/Background_(%s).mat'];
    for V = 1 : numel(PRM.CAMS)
        % load bg_means and bg_vars
        BG_STATS{V} = load(sprintf(bgModelPath,...
            PRM.CAMS{V}.name),'bg_means','bg_vars');
        for M = 1 : numel(BG_STATS{V}.bg_means)
            ind = find(BG_STATS{V}.bg_vars{M} == 0.1);
            BG_STATS{V}.bg_vars{M}(ind) = 1.0000e-003;
        end
    end

??? Reference to non-existent field 'bg_means'.

Error in ==> ComputeSilhouettes_ABC2 at 28 for M = 1 : numel(BG_STATS{V}.bg_means)

Error in ==> LoadFrame at 61 bgs = ComputeSilhouettes_ABC2(frame,img);

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Answer 1

Image Analyst 2014-5-9

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https://ww2.mathworks.cn/matlabcentral/answers/128871-how-to-removed-the-reference-to-non-existent-field-error#answer_136177

Why are you making it a cell array? Will you need all of them after the loop has finished? If not, then get rid of the braces and have it be just a normal structure. Then use fieldnames() to see what fields it has.

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Image Analyst 2014-5-9

在 MATLAB Online 中打开

Try

thisBG = load(sprintf...............
BG_STATS{V} = thisBG;
fieldnames(thisBG);
bg_means = thisBG.bg_means;

Sanjay Saini 2014-5-9

Thank you sir problem has been solved

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Answer 2

Roberto 2014-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/128871-how-to-removed-the-reference-to-non-existent-field-error#answer_136119

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this only means that variable 'bg_means' doesn't exist in your file:

sprintf(bgModelPath,PRM.CAMS{V}.name)

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Sanjay Saini 2014-5-9

Respected Roberto, bg_means is available in my path directory which i have given as: bgModelPath = [ABC2_DATASET_BASE_PATH '/' SN ... '/Background/Background_(%s).mat']; Both variable 'bg_means' and 'bg_vars' is available inside Background_(%s).mat file and this file path i have given as: bgModelPath = [ABC2_DATASET_BASE_PATH '/' SN ... '/Background/Background_(%s).mat']; But in path directory have 4 camera Background (Background_(C1).mat, Background_(C2).mat, Background_(C3).mat, Background_(C4).mat) and each one contain 'bg_means' and 'bg_vars' so should i give each camera background path??

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