No OCR results on good Image

Why doesn't this give me any results??? Can somebody help me out? On other occasions, OCR hasn't given me any trouble at all, but now I'm stuck. The contrast of the image seems fine. Even better after sharpening:

I=imread('/image_file_path');
I=imsharpen(I);
close all
try
for i=1:5

roi= [20,5,30,40]+[54*(i-1),0,0,0];

card=ocr(I,roi,'Language','language_file_path');
card_val{i}=card.Text;

Iocr= insertObjectAnnotation(I, 'rectangle', roi,'');
figure;imshow(Iocr);  
%hold on

end
catch

disp('error')

end

[J S]

Tried with default (untrained language), too. No results