scipy.io.matlab.miobase.MatReadError: Mat file appears to be empty #21
Description
matlab:2014a
python:2.7
ubuntu
here is the selective_search.py:
import tempfile
import subprocess
import shlex
import os
import numpy as np
import scipy.io
script_dirname = os.path.abspath(os.path.dirname(file))
def get_windows(image_fnames, cmd='selective_search'):
"""
Run MATLAB Selective Search code on the given image filenames to
generate window proposals.
Parameters
image_filenames: strings
Paths to images to run on.
cmd: string
selective search function to call:
- 'selective_search' for a few quick proposals
- 'selective_seach_rcnn' for R-CNN configuration for more coverage.
"""
Form the MATLAB script command that processes images and write to
temporary results file.
f, output_filename = tempfile.mkstemp(suffix='.mat')
os.close(f)
fnames_cell = '{' + ','.join("'{}'".format(x) for x in image_fnames) + '}'
command = "{}({}, '{}')".format(cmd, fnames_cell, output_filename)
print(command)
Execute command in MATLAB.
mc = "matlab -nojvm -r "try; {}; catch; exit; end; exit"".format(command)
pid = subprocess.Popen(
shlex.split(mc), stdout=open('NUL', 'w'), cwd=script_dirname)
retcode = pid.wait()
if retcode != 0:
raise Exception("Matlab script did not exit successfully!")
Read the results and undo Matlab's 1-based indexing.
all_boxes = list(scipy.io.loadmat(output_filename)['all_boxes'][0])
subtractor = np.array((1, 1, 0, 0))[np.newaxis, :]
all_boxes = [boxes - subtractor for boxes in all_boxes]
Remove temporary file, and return.
os.remove(output_filename)
if len(all_boxes) != len(image_fnames):
raise Exception("Something went wrong computing the windows!")
return all_boxes
if name == 'main':
"""
Run a demo.
"""
import time
image_filenames = [
script_dirname + '\000015.jpg',
script_dirname + '\cat.jpg'
] * 4
t = time.time()
boxes = get_windows(image_filenames)
print(boxes[:2])
print("Processed {} images in {:.3f} s".format(
len(image_filenames), time.time() - t))
when i run python selective_search.py in cmd:
it have problem:
selective_search({'D:\selective_search_ijcv_with_python\selective_search_ijcv_wi
th_python\000015.jpg','D:\selective_search_ijcv_with_python\selective_search_ijc
v_with_python\cat.jpg','D:\selective_search_ijcv_with_python\selective_search_ij
cv_with_python\000015.jpg','D:\selective_search_ijcv_with_python\selective_searc
h_ijcv_with_python\cat.jpg','D:\selective_search_ijcv_with_python\selective_sear
ch_ijcv_with_python\000015.jpg','D:\selective_search_ijcv_with_python\selective_
search_ijcv_with_python\cat.jpg','D:\selective_search_ijcv_with_python\selective
_search_ijcv_with_python\000015.jpg','D:\selective_search_ijcv_with_python\selec
tive_search_ijcv_with_python\cat.jpg'}, 'c:\users\lh7610~1.arc\appdata\local\tem
p\tmpp6f4z8.mat')
Traceback (most recent call last):
File "selective_search.py", line 63, in
boxes = get_windows(image_filenames)
File "selective_search.py", line 42, in get_windows
all_boxes = list(scipy.io.loadmat(output_filename)['all_boxes'][0])
File "D:\python\lib\site-packages\scipy\io\matlab\mio.py", line 135, in loadma
t
MR = mat_reader_factory(file_name, appendmat, **kwargs)
File "D:\python\lib\site-packages\scipy\io\matlab\mio.py", line 59, in mat_rea
der_factory
mjv, mnv = get_matfile_version(byte_stream)
File "D:\python\lib\site-packages\scipy\io\matlab\miobase.py", line 224, in ge
t_matfile_version
raise MatReadError("Mat file appears to be empty")
scipy.io.matlab.miobase.MatReadError: Mat file appears to be empty
1.the path of my picture is right.
2.i check the c:\users\lh7610~1.arc\appdata\local\temp and found no mat file.
3.i think the matlab cannot produce the mat file even though it has right picture path.
4.i have put the path "D:\selective_search_ijcv_with_python\selective_search_ijcv_with_python" in PYTHONPATH , caffe_ROOT and path.
5.when i "python selective_search",i can see matlab commit windows and disappear in a while.
who can help me!!