from __future__ import absolute_import
from __future__ import print_function
__all__ = ['visualize_ranked_results']
import numpy as np
import os
import os.path as osp
import shutil
from .tools import mkdir_if_missing
[docs]def visualize_ranked_results(distmat, dataset, save_dir='', topk=20):
"""Visualizes ranked results.
Supports both image-reid and video-reid.
Args:
distmat (numpy.ndarray): distance matrix of shape (num_query, num_gallery).
dataset (tuple): a 2-tuple containing (query, gallery), each of which contains
tuples of (img_path(s), pid, camid).
save_dir (str): directory to save output images.
topk (int, optional): denoting top-k images in the rank list to be visualized.
"""
num_q, num_g = distmat.shape
print('Visualizing top-{} ranks'.format(topk))
print('# query: {}\n# gallery {}'.format(num_q, num_g))
print('Saving images to "{}"'.format(save_dir))
query, gallery = dataset
assert num_q == len(query)
assert num_g == len(gallery)
indices = np.argsort(distmat, axis=1)
mkdir_if_missing(save_dir)
def _cp_img_to(src, dst, rank, prefix):
"""
Args:
src: image path or tuple (for vidreid)
dst: target directory
rank: int, denoting ranked position, starting from 1
prefix: string
"""
if isinstance(src, tuple) or isinstance(src, list):
dst = osp.join(dst, prefix + '_top' + str(rank).zfill(3))
mkdir_if_missing(dst)
for img_path in src:
shutil.copy(img_path, dst)
else:
dst = osp.join(dst, prefix + '_top' + str(rank).zfill(3) + '_name_' + osp.basename(src))
shutil.copy(src, dst)
for q_idx in range(num_q):
qimg_path, qpid, qcamid = query[q_idx]
if isinstance(qimg_path, tuple) or isinstance(qimg_path, list):
qdir = osp.join(save_dir, osp.basename(qimg_path[0]))
else:
qdir = osp.join(save_dir, osp.basename(qimg_path))
mkdir_if_missing(qdir)
_cp_img_to(qimg_path, qdir, rank=0, prefix='query')
rank_idx = 1
for g_idx in indices[q_idx,:]:
gimg_path, gpid, gcamid = gallery[g_idx]
invalid = (qpid == gpid) & (qcamid == gcamid)
if not invalid:
_cp_img_to(gimg_path, qdir, rank=rank_idx, prefix='gallery')
rank_idx += 1
if rank_idx > topk:
break
print("Done")