About image resize in Caffe

[Yin Zheng]

Hi Guys,

In the tutorial of Caffe, we use the following code to resize images and generate lmdb dataset:

echo "Creating val lmdb..."

GLOG_logtostderr=1 $TOOLS/convert_imageset \

    --resize_height=$RESIZE_HEIGHT \

    --resize_width=$RESIZE_WIDTH \

    --shuffle \

    $VAL_DATA_ROOT \

    $DATA/val.txt \

    $EXAMPLE/ilsvrc12_val_lmdb

One thing I would like to know is: Will the resize operation change the aspect ration of the original images? For example, if the size of the original image is 150x120 (widthxheight), and the RESIZE_HEIGHT is 80 and RESIZE_WIDTH is 120. Then what is the size of  the resized image? Will Caffe do some padding to keep the aspect ratio?

Thanks very much for any comment!

Best wishes,

Yin

[cooling]

No it does not keep it.

[Yin Zheng]

Hi Cooling,

Thanks very much for the comments! 

Is there some way to keep the aspect ratio? You know, if the image size is very thin, e.g. 120x20, the change of aspect ratio would make the resized image very different from the original one. 

Best wishes,

Yin

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[bingca...@gmail.com]

On Wednesday, October 7, 2015 at 4:33:02 AM UTC-7, Yin Zheng wrote:

If you have the Caffe source code, you may be able to find the answer in the data_transformer.cpp file. I have not tried to use an image size that is NOT square. I was wondering if that is supported.

Cheers,

Bingcai