如何对 InsightFace 私有人脸识别模型进行测试

import cv2


def crop_face_with_expansion(image, bbox, expansion_factor=0.2, max_side=256):
    """
    Crop a single-person headshot with a small margin around the detected
    face box, and optionally downscale so the longest side is <= max_side.

    image:             input image as a numpy array (BGR or RGB).
    bbox:              face bounding box [x, y, width, height] from your
                       detector of choice (RetinaFace, SCRFD, etc.).
    expansion_factor:  total margin ratio (0.2 means +10% on each side).
    max_side:          if set, the longest side of the result is bounded.
    """
    img_h, img_w = image.shape[:2]
    x, y, w, h = bbox

    # 1. Margin distributed evenly to both sides.
    dw = int(w * expansion_factor / 2)
    dh = int(h * expansion_factor / 2)

    # 2. Expanded box, clamped to image bounds.
    x1 = max(0, x - dw)
    y1 = max(0, y - dh)
    x2 = min(img_w, x + w + dw)
    y2 = min(img_h, y + h + dh)

    face_img = image[y1:y2, x1:x2]

    # 3. Optional bounded downscale with a high-quality filter.
    if max_side is not None:
        curr_h, curr_w = face_img.shape[:2]
        longest = max(curr_h, curr_w)
        if longest > max_side:
            scale = max_side / longest
            new_w = int(curr_w * scale)
            new_h = int(curr_h * scale)
            face_img = cv2.resize(
                face_img, (new_w, new_h), interpolation=cv2.INTER_AREA,
            )

    return face_img


# Save the crop with a lossless format (PNG) before sending it to the API.
# Lossy formats (JPEG, WebP at low quality) introduce compression artifacts
# that can measurably reduce face recognition accuracy.
# cv2.imwrite("probe.png", crop)

"""Example client for the private InsightFace feature extraction service.

Uploads a single-person face image to the test endpoint, reads the returned
embedding, and saves it locally with np.save for offline evaluation.

Example invocation (model_name: eagle-2):

    python client.py \
        --server-url <URL delivered by email> \
        --model-name eagle-2 \
        --image probe.png \
        --output probe.npy
"""

import argparse
import os.path as osp

import numpy as np
import requests


def extract_feature(image_path, output_path, url, model_name, timeout=120.0):
    filename = osp.basename(image_path)
    data = {"model_name": model_name}

    with open(image_path, "rb") as infile:
        files = {
            "image": (filename, infile, "application/octet-stream"),
        }
        try:
            resp = requests.post(
                url=url, files=files, data=data, timeout=timeout,
            )
            resp.raise_for_status()
        except requests.RequestException as ex:
            raise SystemExit(
                "request failed: %s: %s" % (type(ex).__name__, str(ex))
            )

    payload = resp.json()
    feature = payload.get("feature")
    if not isinstance(feature, list):
        raise SystemExit("server response feature must be a list")
    if len(feature) == 0:
        raise SystemExit(
            "server returned no features; verify the image contains a "
            "detectable face"
        )

    feat = np.asarray(feature, dtype=np.float32)
    np.save(output_path, feat)
    print("saved feature:", output_path, feat.shape, payload.get("model_name"))
    return feat


def main():
    parser = argparse.ArgumentParser(
        description=(
            "Upload a face image to the private InsightFace test server and "
            "save the embedding with np.save."
        ),
    )
    # The --server-url value is delivered to evaluators by email.
    parser.add_argument(
        "--server-url", required=True,
        help="Feature extraction API URL (sent privately by InsightFace)",
    )
    # The set of choices below is illustrative; the models actually unlocked
    # for your account are listed in your MOU and may evolve over time.
    parser.add_argument(
        "--model-name", required=True,
        choices=["buffalo", "dingo", "eagle", "eagle-2"],
        help="Recognition model to evaluate (must match an entry in your MOU)",
    )
    parser.add_argument("--image", required=True, help="Input face image path (PNG recommended)")
    parser.add_argument("--output", required=True, help="Output .npy file path")
    parser.add_argument("--timeout", type=float, default=120.0, help="HTTP timeout in seconds")
    args = parser.parse_args()

    extract_feature(
        args.image, args.output, args.server_url, args.model_name,
        timeout=args.timeout,
    )


if __name__ == "__main__":
    main()