Warning: JPEG library error (8 bit), "Invalid SOS parameters for sequential JPEG".

Hello there!

I am trying to modify the pretrained network, alexnet, for my images, which are in jpg format. The code after creating the datastore is here:

forestzones = imds.Labels;
[trainimgs,testimgs] = splitEachLabel(imds,0.8,'randomized');
foractual = testimgs.Labels;
trainimgs = augmentedImageDatastore([227 227],trainimgs);
testimgs = augmentedImageDatastore([227 227],testimgs);
anet = alexnet;
layers = anet.Layers;
fc = fullyConnectedLayer(2);
layers(23) = fc;
layers(end) = classificationLayer;
opts = trainingOptions('sgdm','InitialLearnRate',0.01);
[fornet,info] = trainNetwork(trainimgs,layers,opts)

I get >> Warning: JPEG library error (8 bit), "Invalid SOS parameters for sequential JPEG".

As a result I am not getting a proper info table.

What is the problem.

Thank you in advance!!

Answer 1

[Walter Roberson]

https://github.com/lovell/sharp/issues/1578

Apparently the Samsung Galaxy S9 has a bug in how it creates JPEG images that leads to that error.

The JPEG library itself was updated by now, but that has not necessarily made it into your version of MATLAB (and you do not indicate which MATLAB release you are using.)