Error: Undefined function 'preprocessData' for input arguments of type 'cell'.

Question

ali raza 2019-10-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/484377-error-undefined-function-preprocessdata-for-input-arguments-of-type-cell

评论： jose cabrera 2023-4-27

I am implementing MATLAB 2019b examle "Object Detection Using YOLO v2 Deep Learning"(https://www.mathworks.com/help/vision/ug/train-an-object-detector-using-you-only-look-once.html), but when I run the following line of code:

anchorBoxes = estimateAnchorBoxes(preprocessedTrainingData ,numAnchors)

it gives me error as mentioned in title. Thanks for helping out.

A small piece of code from example is mentioned below:

%...............Code..................................%

unzip vehicleDatasetImages.zip

data = load('vehicleDatasetGroundTruth.mat');

vehicleDataset = data.vehicleDataset;

rng(0)

shuffledIdx = randperm(height(vehicleDataset));

idx = floor(0.6 * height(vehicleDataset));

trainingDataTbl = vehicleDataset(shuffledIdx(1:idx),:);

imdsTrain = imageDatastore(trainingDataTbl{:,'imageFilename'});

bldsTrain = boxLabelDatastore(trainingDataTbl(:,'vehicle'));

trainingData = combine(imdsTrain,bldsTrain);

inputSize = [224 224 3];

preprocessedTrainingData = transform(trainingData, @(data)preprocessData(data,inputSize));

numAnchors = 5;

anchorBoxes = estimateAnchorBoxes(preprocessedTrainingData ,numAnchors)

%.................................................................................................................................................%

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Harshveer Singh 2020-5-6

I am also getting the similar error. Unable to resolve it. I copied all the supporting function into a .m file. I then tried calling the function through its name in the command window but unable to do so. Someone please help how to go ahead with it.

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Answer 1

Steven Lord 2019-10-9

6
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/484377-error-undefined-function-preprocessdata-for-input-arguments-of-type-cell#answer_395498

The preprocessData function is a supporting function that is part of that example and is not on the MATLAB path in general. Scroll down to the Supporting Functions section of that example and make a copy of that function, either as a local function inside the file where you're implementing your own variant of the example or as a separate function file.

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TEJAS PHUTANE 2019-12-29

I have changed the code for detection of balls from 1000 images but still stuck on following problem while executing code:

trainingDataForEstimation = transform(trainingData,@(data)preprocessData(data,inputSize));

numAnchors = 7;

[anchorBoxes, meanIoU] = estimateAnchorBoxes(trainingDataForEstimation, numAnchors)

OUTPUT:

Invalid transform function defined on datastore.

The cause of the error was:

Error using bboxresize>iParseInputs (line 89)

The value of 'bboxA' is invalid. Expected input number 1, bboxA, to be integer-valued.

Error in bboxresize (line 49)

params = iParseInputs(bboxA,scale);

Error in training>preprocessData (line 56)

data{2} = bboxresize(data{2},scale);

Error in training>@(data)preprocessData(data,inputSize) (line 17)

trainingDataForEstimation = transform(trainingData,@(data)preprocessData(data,inputSize));

Error in matlab.io.datastore.TransformedDatastore/read (line 148)

data = self.Transforms{ii}(data);

Error in matlab.io.Datastore/readall (line 250)

data = [data; read(copyds)]; %#ok<AGROW>

Error in matlab.io.datastore.TransformedDatastore/readall (line 188)

data = readall@matlab.io.Datastore(copyds);

Error in estimateAnchorBoxes>iReadallBoxes (line 270)

boxes = readall(ds);

Error in estimateAnchorBoxes>iCheckBoxesFromDatastore (line 215)

boxes = iReadallBoxes(ds);

Error in estimateAnchorBoxes>iParseInputs (line 168)

boxes = iCheckBoxesFromDatastore(datastore);

Error in estimateAnchorBoxes (line 136)

[boxes, numAnchors, params] = iParseInputs(datastore, numAnchors, varargin{:});

Error in training (line 19)

[anchorBoxes, meanIoU] = estimateAnchorBoxes(trainingDataForEstimation, numAnchors)

jose cabrera 2023-4-27

Hi, Did you find the solution??

Im getting the same problem

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Answer 2

michael scheinfeild 2020-3-7

15
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https://ww2.mathworks.cn/matlabcentral/answers/484377-error-undefined-function-preprocessdata-for-input-arguments-of-type-cell#answer_419002

在 MATLAB Online 中打开

some fix needed in preprocessing , first round and be sure it is positive top left , i think maybe check box outside image will be good , i didnt did it . also rounding of box cordinates is important !. also see that in image we have several bounding boxes and we check them all !

function data = preprocessData(data,targetSize)
% Resize image and bounding boxes to the targetSize.
scale = targetSize(1:2)./size(data{1},[1 2]);
data{1} = imresize(data{1},targetSize(1:2));
boxEstimate=round(data{2});
boxEstimate(:,1)=max(boxEstimate(:,1),1);
boxEstimate(:,2)=max(boxEstimate(:,2),1);
data{2} = bboxresize(boxEstimate,scale);
end