Extract features - error unable to save .png

[mende...@gmail.com]

Hello,

I'm trying too run the examples from the website with the features extraction and i'm having an error saying some errors about reading and writing .png files.

I ran the following command:
/home/pic/TheiaSfM-master/theia-build/bin/extract_features --input_imgs=/home/pic/Reconstruction/data/*.JPG --img_output_dir=/home/pic/Reconstruction/data/image_features --num_threads=4 --descriptor=SIFT

I have the images in the input_imgs folder, and img_output_dir is an empty folder. I receive the following error:

convert: unable to open image `/home/pic/Reconstruction/data/image_features/detected_image_0.png': No such file or directory @ error/blob.c/OpenBlob/2695.
convert: WriteBlob Failed `/home/pic/Reconstruction/data/image_features/detected_image_0.png' @ error/png.c/MagickPNGErrorHandler/1630.
sh: 1: gm: not found
terminate called after throwing an instance of 'cimg_library::CImgIOException'
what(): [instance(4272,2848,1,3,0x7ff569e49010,non-shared)] CImg<float>::save_other(): Failed to save file '/home/pic/Reconstruction/data/image_features/detected_image_0.png'. Format is not natively supported, and no external commands succeeded.

I hope someone can solve this.

Thanks,

Pedro

[Chris Sweeney]

Hi Pedro,

I think this is an issue regarding which image libraries you have installed. Could you be sure to install libjpeg and libpng? And if that doesn't work then install imagemagick as well.

Chris

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[mende...@gmail.com]

Hello Chris

All the libs you asked are installed and I also have ImageMagick installed

Best,

Pedro

[Chris Sweeney]

Hi Pedro,

This line states that your file does not exist. Can you verify with `ls` that it exists?

 `/home/pic/Reconstruction/data/image_features/detected_image_0.png': No such file or directory

[mende...@gmail.com]

The image does not exist, but i think it's normal because that folder is the output folder. So it would only had images in the end

[Chris Sweeney]

Ok. Is the directory writeable?

[ping...@gmail.com]

mende...@gmail.com於 2015年8月24日星期一 UTC+8下午5時50分36秒寫道：

Hi Pedro,

Try

"sudo apt-get install graphicsmagick"

Ping