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#!/usr/bin/env python
"""
Register neighbouring frames of video and save inter-frame transform
parameters to a file.
Usage:
register_video.py [options] <inputvideo> <outputh5>
register_video.py (-h | --help)
Options:
-g GROUPSIZE, --group=GROUPSIZE Frame pairs per work-group [default: 32]
"""
import logging
import cv2
from docopt import docopt
import dtcwt
from dtcwt.numpy import Transform2d
import dtcwt.registration as reg
import dtcwt.sampling
import numpy as np
from mpi4py import MPI
import tables
# Parse command line options
OPTS = docopt(__doc__)
class VideoReader(object):
def __init__(self, filename, groupsize=None):
self._vc = cv2.VideoCapture(filename)
self._last_frame = None
self._last_frame_idx = -1
self.groupsize = groupsize or int(OPTS['--group'])
def read_next_gof(self):
"""
Read the next group of frames from *videoreader*.
"""
frames = []
if self._last_frame is not None:
frames.append((self._last_frame_idx, self._last_frame))
for it in xrange(self.groupsize):
success, f = self._vc.read()
if not success:
break
self._last_frame = cv2.cvtColor(f, cv2.COLOR_RGB2GRAY) / 255.0
self._last_frame_idx += 1
frames.append((self._last_frame_idx, self._last_frame))
return frames
def avecs_for_frames(frames):
if len(frames) <= 1:
return [],[]
avecs = []
trans = Transform2d()
idx, frame = frames[0]
t = trans.forward(frame, nlevels=5)
h_pair = (None, t)
idx_pair = (None, idx)
idx_pairs = []
for idx, frame in frames[1:]:
t = trans.forward(frame, nlevels=5)
h_pair = (h_pair[1], t)
idx_pair = (idx_pair[1], idx)
idx_pairs.append(idx_pair)
avecs.append(reg.estimatereg(h_pair[0], h_pair[1]))
logging.info('Finished frame pair {0}'.format(idx_pair))
return idx_pairs, avecs
class Metadata(tables.IsDescription):
videopath = tables.StringCol(512)
def main():
comm = MPI.COMM_WORLD
rank = comm.Get_rank()
size = comm.Get_size()
logging.basicConfig(level=logging.INFO, format='Rank ' + str(comm.Get_rank()) + ': %(message)s')
logging.info('Launched')
if rank == 0:
# I'm rank 0. Open the video file for reading
logging.info('Loading video from "{0}"'.format(OPTS['<inputvideo>']))
v = VideoReader(OPTS['<inputvideo>'])
outfile = tables.openFile(OPTS['<outputh5>'], mode='w',
title='Frame to frame registration from "{0}"'.format(OPTS['<inputvideo>']))
# Create a frame pair e-array
frame_pairs = outfile.createEArray('/', 'frame_idx_pairs',
atom=tables.Int64Atom(),
shape=(0,2),
title='(before, after) frame indices for corresponding affine parameters')
metadata_table = outfile.createTable('/', 'metadata', Metadata, 'Metadata')
metadata = metadata_table.row
metadata['videopath'] = OPTS['<inputvideo>']
metadata.append()
affine_params = None # Will be created after first bit of data
# Commit to disk
outfile.flush()
is_last_iteration = False
last_frame = None
group_idx = 0
while not is_last_iteration:
groups = None
if rank == 0:
logging.info('Reading next set of work group frames')
# Read frames for next work group
groups = []
for group in xrange(size):
gof = v.read_next_gof()
groups.append((group_idx, gof))
group_idx += 1
# If we run out of frames, this is the last iteration
is_last_iteration = len(gof) <= 1
logging.info('Sending work group frames')
# Broadcast iteration flag to nodes
is_last_iteration = comm.bcast(is_last_iteration, root=0)
# Scatter to nodes
group_id, frames = comm.scatter(groups, root=0)
logging.info('received work group id={0} of {1} frame(s)'.format(group_id, len(frames)))
# Calculate result
idxs_and_avecs = avecs_for_frames(frames)
# Send result back to rank 0
logging.info('finished. Sending {1} results'.format(rank, len(idxs_and_avecs)))
gathered = comm.gather(idxs_and_avecs, root=0)
if rank == 0:
for idxs, av in gathered:
assert len(idxs) == len(av)
if affine_params is None and len(av) > 0:
affine_params = outfile.createEArray('/', 'affine_parameters',
atom=tables.Float64Atom(),
shape=(0,) + av[0].shape,
title='affine parameters for corresponding frame index pairs')
if len(av) > 0:
affine_params.append(av)
frame_pairs.append(idxs)
outfile.flush()
logging.info('Frame pairs processed: {0}'.format(affine_params.shape[0]))
if rank == 0:
outfile.close()
if __name__ == '__main__':
main()
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