Problem to use sift in Vlfeat

[willard-yuan]

Hi, jesolem. In the sift.py:

    cmmd = str("sift.exe "+imagename+" --output="+resultname+
                " "+params)
    os.system(cmmd)

I have read you blog post Another Python Interface for SIFT. You use the os.system() to call the vlfeat's sift.exe in the context the environment variable has been added to the system path. I did so, but it failed to dectect the sift key points.

Instead, I change it with a full path:

    cmmd = str("D:\\mltools\\vlfeat\\sift.exe "+imagename+" --output="+resultname+
                " "+params)

then it succeeds.

I don't know the reason why the former failed, can you help to let the former succeed?

[jesolem]

Did you add the full (absolute) path to the env variable?

[willard-yuan]

Yes, I do. I test it under Windows 7 OS. After I add the full path to the env variable, It throws these error:

Traceback (most recent call last):
  File "F:/dropbox/Dropbox/translation/pcv-notebook/ch02/ch02_sift.py", line 14, in <module>
    l1, d1 = sift.read_features_from_file('empire.sift')
  File "C:\Python27\lib\site-packages\PCV\localdescriptors\sift.py", line 30, in read_features_from_file
    f = loadtxt(filename)
  File "C:\Python27\lib\site-packages\numpy\lib\npyio.py", line 729, in loadtxt
processed tmp.pgm to empire.sift
    fh = iter(open(fname, 'U'))
IOError: [Errno 2] No such file or directory: 'empire.sift'

The error indicates it doesn't find the sift.exe. To solve this problem, I bulid a folder .\\utils\\win32vlfeat\\sift.exe to contains the VLfeat. It's here. I don't think it's not a good way to solve this problem. Is there a perfect way to solve this problem?

[yc-kata]

It's a good way to this question， I think。

At 2014-08-12 08:31:59, "Yong Yuan" notifications@github.com wrote:

Yes, I do. I test it under Windows 7 OS. After I add the full path to the env variable, It throws these error:

Traceback (most recent call last):
File "F:/dropbox/Dropbox/translation/pcv-notebook/ch02/ch02_sift.py", line 14, in
l1, d1= sift.read_features_from_file('empire.sift')
File "C:\Python27\lib\site-packages\PCV\localdescriptors\sift.py", line 30, in read_features_from_file
f= loadtxt(filename)
File "C:\Python27\lib\site-packages\numpy\lib\npyio.py", line 729, in loadtxt
processed tmp.pgm to empire.sift
fh= iter(open(fname, 'U'))
IOError: [Errno 2] No such file or directory: 'empire.sift'

The error indicates it doesn't find the sift.exe. To solve this problem, I bulid a folder .\utils\win32vlfeat\sift.exe to contains the VLfeat. It's here. I don't think it's not a good way to solve this problem. Is there a perfect way to solve this problem?

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[willard-yuan]

It works, but not perfect. I hope to find a method which doesn't need to modify the source code sift.py of library PCV.

[jesolem]

People seem to have problems with the VLFeat executable. I'm going to try to replace that for the next edition. Thanks all.

[willard-yuan]

Great, I can't wait to read it.

[ngunhaSO]

@jesolem yes, I would love to read your next edition where you can replace the VLFeat executable by something less platform dependent. Thanks!