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

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Sanjay Saini
Sanjay Saini 2014-5-8
评论： Sanjay Saini 2014-5-9
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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采纳的回答

Image Analyst
Image Analyst 2014-5-9
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
Image Analyst 2014-5-9
Try
thisBG = load(sprintf...............
BG_STATS{V} = thisBG;
fieldnames(thisBG);
bg_means = thisBG.bg_means;

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更多回答（1 个）

Roberto
Roberto 2014-5-8
this only means that variable 'bg_means' doesn't exist in your file:
sprintf(bgModelPath,PRM.CAMS{V}.name)
  1 个评论
Sanjay Saini
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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