282 lines
10 KiB
Python
282 lines
10 KiB
Python
"""虎牙滑块/点选验证码 OCR。"""
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from __future__ import annotations
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from functools import lru_cache
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from io import BytesIO
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from pathlib import Path
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from typing import cast
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import cv2
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import numpy as np
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import onnxruntime as ort
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from PIL import Image
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from scipy.optimize import linear_sum_assignment
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MODEL_DIR = Path(__file__).resolve().parent / "models"
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class YoloOnnx:
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"""轻量 YOLO ONNX 推理封装。"""
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def __init__(
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self,
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model_path: str | Path,
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classes: list[str],
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providers: list[str] | None = None,
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):
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providers = providers or ["CPUExecutionProvider"]
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ort.set_default_logger_severity(3)
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self.session = ort.InferenceSession(str(model_path), providers=providers)
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self.input_name = self.session.get_inputs()[0].name
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self.output_name = self.session.get_outputs()[0].name
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self.input_shape = self.session.get_inputs()[0].shape[2:]
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self.names = classes
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self.scale = 1.0
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self.pad_top = 0
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self.pad_left = 0
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@staticmethod
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def xywh2xyxy(value: np.ndarray) -> np.ndarray:
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result = np.copy(value)
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result[..., 0] = value[..., 0] - value[..., 2] / 2
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result[..., 1] = value[..., 1] - value[..., 3] / 2
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result[..., 2] = value[..., 0] + value[..., 2] / 2
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result[..., 3] = value[..., 1] + value[..., 3] / 2
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return result
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def preprocess(self, image: Image.Image) -> np.ndarray:
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img = cv2.cvtColor(np.array(image), cv2.COLOR_RGB2BGR)
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height, width = img.shape[:2]
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self.scale = min(self.input_shape[0] / height, self.input_shape[1] / width)
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new_size = (int(width * self.scale), int(height * self.scale))
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resized = cv2.resize(img, new_size, interpolation=cv2.INTER_LINEAR)
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dh = self.input_shape[0] - new_size[1]
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dw = self.input_shape[1] - new_size[0]
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self.pad_top = dh // 2
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pad_bottom = dh - self.pad_top
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self.pad_left = dw // 2
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pad_right = dw - self.pad_left
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padded = cv2.copyMakeBorder(
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resized,
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self.pad_top,
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pad_bottom,
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self.pad_left,
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pad_right,
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cv2.BORDER_CONSTANT,
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value=(114, 114, 114),
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)
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input_tensor = padded.transpose(2, 0, 1).astype(np.float32) / 255.0
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return np.expand_dims(input_tensor, axis=0)
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@staticmethod
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def nms(
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boxes: np.ndarray, scores: np.ndarray, iou_threshold: float = 0.3
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) -> list[int]:
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order = scores.argsort()[::-1]
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keep = []
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while order.size > 0:
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index = order[0]
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keep.append(index)
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xx1 = np.maximum(boxes[index, 0], boxes[order[1:], 0])
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yy1 = np.maximum(boxes[index, 1], boxes[order[1:], 1])
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xx2 = np.minimum(boxes[index, 2], boxes[order[1:], 2])
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yy2 = np.minimum(boxes[index, 3], boxes[order[1:], 3])
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width = np.maximum(0.0, xx2 - xx1)
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height = np.maximum(0.0, yy2 - yy1)
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intersection = width * height
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area_i = (boxes[index, 2] - boxes[index, 0]) * (
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boxes[index, 3] - boxes[index, 1]
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)
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area_j = (boxes[order[1:], 2] - boxes[order[1:], 0]) * (
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boxes[order[1:], 3] - boxes[order[1:], 1]
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)
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iou = intersection / (area_i + area_j - intersection + 1e-7)
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inds = np.where(iou <= iou_threshold)[0]
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order = order[inds + 1]
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return keep
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def postprocess(
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self,
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outputs: list[np.ndarray],
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conf_threshold: float = 0.1,
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iou_threshold: float = 0.3,
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) -> list[dict]:
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predictions = np.squeeze(outputs[0]).T
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class_scores = predictions[:, 4:]
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scores = np.max(class_scores, axis=1)
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class_ids = np.argmax(class_scores, axis=1)
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valid_indices = scores > conf_threshold
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predictions = predictions[valid_indices]
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scores = scores[valid_indices]
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class_ids = class_ids[valid_indices]
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if predictions.size == 0:
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return []
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boxes = predictions[:, :4].copy()
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boxes[:, 0] = (boxes[:, 0] - self.pad_left) / self.scale
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boxes[:, 1] = (boxes[:, 1] - self.pad_top) / self.scale
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boxes[:, 2] /= self.scale
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boxes[:, 3] /= self.scale
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xyxy_boxes = self.xywh2xyxy(boxes)
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keep_indices = []
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for class_id in np.unique(class_ids):
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class_indices = np.where(class_ids == class_id)[0]
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class_keep = self.nms(
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xyxy_boxes[class_indices],
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scores[class_indices],
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iou_threshold,
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)
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keep_indices.extend(class_indices[class_keep])
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results = []
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for index in keep_indices:
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class_id = int(class_ids[index])
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x1, y1, x2, y2 = map(int, xyxy_boxes[index].tolist())
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results.append(
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{
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"label_id": class_id,
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"label_name": self.names[class_id],
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"confidence": float(scores[index]),
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"box_mid_xy": [(x1 + x2) // 2, (y1 + y2) // 2],
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"xyxy": [x1, y1, x2, y2],
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}
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)
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results.sort(key=lambda item: item["confidence"], reverse=True)
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return results
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def detect(self, image: Image.Image) -> list[dict]:
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input_tensor = self.preprocess(image)
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outputs = cast(
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list[np.ndarray],
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self.session.run([self.output_name], {self.input_name: input_tensor}),
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)
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return self.postprocess(outputs)
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class SimilarityOnnx:
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"""点选验证码中目标图和候选字的相似度模型。"""
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def __init__(self, model_path: str | Path, providers: list[str] | None = None):
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providers = providers or ["CPUExecutionProvider"]
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ort.set_default_logger_severity(3)
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self.session = ort.InferenceSession(str(model_path), providers=providers)
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self.input_shape: tuple[int, int] = (64, 64)
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@staticmethod
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def sigmoid(value: np.ndarray) -> np.ndarray:
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return 1 / (1 + np.exp(-value))
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@staticmethod
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def _to_image(value) -> Image.Image:
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if isinstance(value, np.ndarray):
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return Image.fromarray(value)
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if isinstance(value, bytes):
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return Image.open(BytesIO(value))
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if isinstance(value, Image.Image):
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return value
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return Image.open(value)
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def _tensor(self, value) -> np.ndarray:
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image = (
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self._to_image(value)
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.convert("RGB")
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.resize((self.input_shape[1], self.input_shape[0]), 1)
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)
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array = np.array(image).astype(np.float32) / 255.0
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return np.expand_dims(np.transpose(array, (2, 0, 1)), 0)
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def score(self, image_1, image_2) -> int:
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out = self.session.run(
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None, {"x1": self._tensor(image_1), "x2": self._tensor(image_2)}
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)
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similarity = self.sigmoid(cast(np.ndarray, out[0]))[0][0]
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return int(round(similarity.item(), 2) * 100)
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class HuyaCaptchaOcr:
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"""封装虎牙滑块和点选识别。"""
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def __init__(
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self, model_dir: str | Path = MODEL_DIR, providers: list[str] | None = None
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):
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model_dir = Path(model_dir)
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self.similarity = SimilarityOnnx(
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model_dir / "weights.onnx", providers=providers
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)
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self.click_model = YoloOnnx(
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model_dir / "best.onnx", classes=["target", "char"], providers=providers
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)
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self.slider_model = YoloOnnx(
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model_dir / "slider_2.onnx", classes=["slider"], providers=providers
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)
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@staticmethod
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def _open_image(image_bytes: bytes) -> Image.Image:
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return Image.open(BytesIO(image_bytes)).convert("RGB")
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def ocr_slider_box(self, image_bytes: bytes) -> list[int]:
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"""识别滑块缺口框，返回 [x1, y1, x2, y2]。"""
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image = self._open_image(image_bytes)
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detections = self.slider_model.detect(image)
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boxes = [item["xyxy"] for item in detections]
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return boxes[0] if boxes else [100, 100, 100, 100]
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def ocr_click_points(self, image_bytes: bytes) -> list[list[int]]:
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"""识别点选坐标，返回按目标顺序排列的点击点。"""
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image = self._open_image(image_bytes)
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detections = self.click_model.detect(image)
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results = [
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{**item, "cropped_image": image.crop(tuple(item["xyxy"]))}
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for item in detections
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]
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char_list = [item for item in results if item.get("label_name") == "char"]
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target_list = [item for item in results if item.get("label_name") == "target"]
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target_list = [
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item for item in target_list if item["xyxy"][2] - item["xyxy"][0] > 10
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]
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char_list.sort(key=lambda item: item["xyxy"][0])
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target_list.sort(key=lambda item: item["xyxy"][0])
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if not char_list or not target_list:
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return []
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score_matrix = np.zeros((len(target_list), len(char_list)))
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for target_index, target in enumerate(target_list):
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for char_index, char in enumerate(char_list):
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try:
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score_matrix[target_index][char_index] = -self.similarity.score(
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target["cropped_image"],
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char["cropped_image"],
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)
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except Exception: # noqa: BLE001 外部接口与任务边界需要保留宽泛异常兜底
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score_matrix[target_index][char_index] = 1e6
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row_ind, col_ind = linear_sum_assignment(score_matrix)
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matched = []
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for target_index, char_index in zip(row_ind, col_ind):
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if score_matrix[target_index][char_index] == 1e6:
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continue
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char = char_list[char_index]
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matched.append({**char, "index": target_index + 1})
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return [item["box_mid_xy"] for item in matched]
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@lru_cache(maxsize=1)
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def default_ocr() -> HuyaCaptchaOcr:
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"""懒加载默认 OCR，避免导入 core.huya 时立即加载 150MB 模型。"""
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return HuyaCaptchaOcr()
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