Method _preprocess_image

utils/icon_detection.py:494–524

预处理图像 Args: image: 输入图像 Returns: 处理后的灰度图像，失败返回None

(self, image: Union[np.ndarray, str])

        return result
    
    def _preprocess_image(self, image: Union[np.ndarray, str]) -> Optional[np.ndarray]:
        """
        预处理图像
        
        Args:
            image: 输入图像
            
        Returns:
            处理后的灰度图像，失败返回None
        """
        try:
            if isinstance(image, str):
                if not os.path.exists(image):
                    logger.error(f"图像文件不存在: {image}")
                    return None
                img = cv2.imread(image)
                if img is None:
                    logger.error(f"无法读取图像文件: {image}")
                    return None
            else:
                img = image.copy()
            
            # 转换为灰度图
            if len(img.shape) == 3:
                img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
            
            return img
            
        except Exception as e:
            logger.error(f"图像预处理失败: {e}")
            return None
    
    def get_available_icons(self, app_id: Optional[str] = None) -> List[str]:
        """