hloc/utils/parsers.py

from pathlib import Path
import logging
import numpy as np
from collections import defaultdict
import pycolmap

logger = logging.getLogger(__name__)


def parse_image_list(path, with_intrinsics=False):
    images = []
    with open(path, "r") as f:
        for line in f:
            line = line.strip("\n")
            if len(line) == 0 or line[0] == "#":
                continue
            name, *data = line.split()
            if with_intrinsics:
                model, width, height, *params = data
                params = np.array(params, float)
                cam = pycolmap.Camera(model, int(width), int(height), params)
                images.append((name, cam))
            else:
                images.append(name)

    assert len(images) > 0
    logger.info(f"Imported {len(images)} images from {path.name}")
    return images


def parse_image_lists(paths, with_intrinsics=False):
    images = []
    files = list(Path(paths.parent).glob(paths.name))
    assert len(files) > 0
    for lfile in files:
        images += parse_image_list(lfile, with_intrinsics=with_intrinsics)
    return images


def parse_retrieval(path):
    retrieval = defaultdict(list)
    with open(path, "r") as f:
        for p in f.read().rstrip("\n").split("\n"):
            if len(p) == 0:
                continue
            q, r = p.split()
            retrieval[q].append(r)
    return dict(retrieval)


def names_to_pair(name0, name1, separator="/"):
    return separator.join((name0.replace("/", "-"), name1.replace("/", "-")))


def names_to_pair_old(name0, name1):
    return names_to_pair(name0, name1, separator="_")