File size: 1,822 Bytes
9223079
8320ccc
 
9223079
8320ccc
 
6cb641c
8320ccc
9223079
 
 
 
 
 
 
3c77caa
 
9223079
 
 
 
 
 
3c77caa
9223079
6cb641c
3c77caa
9223079
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4c930ba
9223079
 
 
 
 
 
 
 
 
 
 
 
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
import warnings

import torch
from kornia.feature import LoFTR as LoFTR_
from kornia.feature.loftr.loftr import default_cfg

from hloc import logger

from ..utils.base_model import BaseModel


class LoFTR(BaseModel):
    default_conf = {
        "weights": "outdoor",
        "match_threshold": 0.2,
        "sinkhorn_iterations": 20,
        "max_keypoints": -1,
    }
    required_inputs = ["image0", "image1"]

    def _init(self, conf):
        cfg = default_cfg
        cfg["match_coarse"]["thr"] = conf["match_threshold"]
        cfg["match_coarse"]["skh_iters"] = conf["sinkhorn_iterations"]
        self.net = LoFTR_(pretrained=conf["weights"], config=cfg)
        logger.info(f"Loaded LoFTR with weights {conf['weights']}")

    def _forward(self, data):
        # For consistency with hloc pairs, we refine kpts in image0!
        rename = {
            "keypoints0": "keypoints1",
            "keypoints1": "keypoints0",
            "image0": "image1",
            "image1": "image0",
            "mask0": "mask1",
            "mask1": "mask0",
        }
        data_ = {rename[k]: v for k, v in data.items()}
        with warnings.catch_warnings():
            warnings.simplefilter("ignore")
            pred = self.net(data_)

        scores = pred["confidence"]

        top_k = self.conf["max_keypoints"]
        if top_k is not None and len(scores) > top_k:
            keep = torch.argsort(scores, descending=True)[:top_k]
            pred["keypoints0"], pred["keypoints1"] = (
                pred["keypoints0"][keep],
                pred["keypoints1"][keep],
            )
            scores = scores[keep]

        # Switch back indices
        pred = {(rename[k] if k in rename else k): v for k, v in pred.items()}
        pred["scores"] = scores
        del pred["confidence"]
        return pred