build/tools/compute_image_mean can not work!

[kangyiS]

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Issue summary

I used caffe/build/tools/compute_image_mean to get a mean.binaryproto file, but all the means are zero which must be wrong.

Steps to reproduce

1. cd caffe
2. build/tools/compute_image_mean /home/kangyi/data/VOCdevkit/VOC0712/lmdb/VOC0712_trainval_lmdb mean.binaryproto
3. I can get a mean.binaryproto file, but all the means are zero.
4. I'm sure that lmdb files are correct because I used them to train my network successfully.

Tried solutions

I checked the compute_image_mean.cpp and find "datum.ParseFromString(cursor->value());" can not get the correct datum. datum.channels(), datum.width() and datum.height() are all zero.

System configuration

• Operating system: Ubuntu16.04
• Compiler:
• CUDA version (if applicable):
• CUDNN version (if applicable):
• BLAS:
• Python version (if using pycaffe):
• MATLAB version (if using matcaffe):

Issue checklist

• read the guidelines and removed the first paragraph
• written a short summary and detailed steps to reproduce
• explained how solutions to related problems failed (tick if found none)
• filled system configuration
• attached relevant logs/config files (tick if not applicable)