"""
Overview:
Detect upper-half body in anime images.
Trained on dataset `deepghs/anime_halfbody_detection <https://huggingface.co/datasets/deepghs/anime_halfbody_detection>`_ with YOLOv8.
.. image:: halfbody_detect_demo.plot.py.svg
:align: center
This is an overall benchmark of all the halfbody detect models:
.. image:: halfbody_detect_benchmark.plot.py.svg
:align: center
.. note::
Please note that the primary purpose of this tool is to crop upper-body images from illustrations.
Therefore, the training data used mostly consists of single-person images, and **the performance
on images with multiple people is not guaranteed**. If you indeed need to process
images with multiple people, the recommended approach is to first use
the :func:`imgutils.detect.person.detect_person` function to crop individuals,
and then use this tool to obtain upper-body images.
"""
from typing import List, Tuple, Optional
from ..data import ImageTyping
from ..generic import yolo_predict
_REPO_ID = 'deepghs/anime_halfbody_detection'
[docs]def detect_halfbody(image: ImageTyping, level: str = 's', version: str = 'v1.0', model_name: Optional[str] = None,
conf_threshold: float = 0.5, iou_threshold: float = 0.7) \
-> List[Tuple[Tuple[int, int, int, int], str, float]]:
"""
Detect human upper-half body in anime images.
This function uses a YOLOv8 model to detect and localize upper-half bodies in anime-style images.
It supports different model levels and versions for flexibility in speed and accuracy trade-offs.
:param image: The input image to perform detection on. Can be a file path, URL, or image data.
:type image: ImageTyping
:param level: The model level to use. Can be either 's' (standard) or 'n' (nano).
The 'n' model is faster with lower system overhead, while 's' offers higher accuracy.
Default is 's'.
:type level: str
:param version: Version of the model to use. Default is 'v1.0'.
:type version: str
:param model_name: Optional custom model name. If not provided, it's constructed from version and level.
:type model_name: Optional[str]
:param conf_threshold: Confidence threshold for detections. Only detections with confidence above
this threshold are returned. Default is 0.5.
:type conf_threshold: float
:param iou_threshold: Intersection over Union (IoU) threshold for non-maximum suppression.
Overlapping detections above this threshold are merged. Default is 0.7.
:type iou_threshold: float
:return: A list of detections. Each detection is a tuple containing:
- Bounding box coordinates as (x0, y0, x1, y1)
- The string 'halfbody' (always)
- The confidence score of the detection
:rtype: List[Tuple[Tuple[int, int, int, int], str, float]]
:raises ValueError: If an invalid level or version is provided.
Examples::
>>> from imgutils.detect import detect_halfbody, detection_visualize
>>>
>>> image = 'squat.jpg'
>>> result = detect_halfbody(image) # detect it
>>> result
[((127, 21, 629, 637), 'halfbody', 0.9040350914001465)]
>>>
>>> # visualize it
>>> from matplotlib import pyplot as plt
>>> plt.imshow(detection_visualize(image, result))
>>> plt.show()
"""
return yolo_predict(
image=image,
repo_id=_REPO_ID,
model_name=model_name or f'halfbody_detect_{version}_{level}',
conf_threshold=conf_threshold,
iou_threshold=iou_threshold,
)