135 lines
6.7 KiB
Python
135 lines
6.7 KiB
Python
import torch
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import cv2
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import numpy as np
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from torchvision.transforms.functional import normalize
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from tqdm import tqdm
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from PIL import Image
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# Helper function to convert a ComfyUI IMAGE tensor to an OpenCV BGR image.
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def tensor_to_cv2_img(tensor_frame: torch.Tensor) -> np.ndarray:
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"""Converts a single PyTorch image tensor (H, W, C) to a CV2 image (H, W, C) in BGR format."""
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img_np = (tensor_frame.cpu().numpy() * 255).astype(np.uint8)
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return cv2.cvtColor(img_np, cv2.COLOR_RGB2BGR)
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# Helper function to convert a ComfyUI IMAGE tensor to a PIL Image.
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def tensor_to_pil(tensor_frame: torch.Tensor, mode='RGB') -> Image.Image:
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"""Converts a single PyTorch image tensor (H, W, C) to a PIL Image."""
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return Image.fromarray((tensor_frame.cpu().numpy() * 255).astype(np.uint8), mode)
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class VideoInputPreprocessor:
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"""
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Processes a batch of image frames to generate a face mask, then uses that mask's
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bounding box to paste a provided RGBA image onto each frame.
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"""
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@classmethod
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def INPUT_TYPES(cls):
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return {
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"required": {
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"face_processor": ("FACE_PROCESSOR",),
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"images": ("IMAGE",),
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"face_rgba": ("IMAGE",),
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"confidence_threshold": ("FLOAT", {"default": 0.5, "min": 0.1, "max": 1.0, "step": 0.05}),
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"face_crop_scale": ("FLOAT", {"default": 1.5, "min": 1.0, "max": 3.0, "step": 0.1}),
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"dilation_kernel_size": ("INT", {"default": 10, "min": 0, "max": 50, "step": 1}),
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"with_neck": ("BOOLEAN", {"default": True, "label_on": "enabled", "label_off": "disabled"}),
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}
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}
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RETURN_TYPES = ("IMAGE",)
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RETURN_NAMES = ("processed_images",)
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FUNCTION = "generate_mask_and_paste"
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CATEGORY = "Stand-In"
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def generate_mask_and_paste(self, face_processor, images: torch.Tensor, face_rgba: torch.Tensor, confidence_threshold: float, face_crop_scale: float, dilation_kernel_size: int, with_neck: bool):
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detection_model, parsing_model, device = face_processor
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total_frames, h, w = images.shape[0], images.shape[1], images.shape[2]
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print(f"Processing {total_frames} frames ({w}x{h}) to paste new face.")
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# --- Prepare the face_to_paste image ---
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# Ensure it is RGBA and convert to PIL for easy pasting with transparency
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if face_rgba.shape[3] != 4:
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raise ValueError("The 'face_to_paste' image must be an RGBA image.")
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# We only need the first image from the batch
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face_to_paste_pil = tensor_to_pil(face_rgba[0], mode='RGBA')
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processed_frames_tensors = []
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for i in tqdm(range(total_frames), desc="Pasting face onto frames"):
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frame_tensor = images[i]
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frame_bgr = tensor_to_cv2_img(frame_tensor)
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# --- 1. Generate Face Mask (same logic as before) ---
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results = detection_model(frame_bgr, verbose=False)
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confident_boxes = results[0].boxes.xyxy[results[0].boxes.conf > confidence_threshold]
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full_mask_np = np.zeros((h, w), dtype=np.uint8)
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if confident_boxes.shape[0] > 0:
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areas = (confident_boxes[:, 2] - confident_boxes[:, 0]) * (confident_boxes[:, 3] - confident_boxes[:, 1])
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x1, y1, x2, y2 = map(int, confident_boxes[torch.argmax(areas)])
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center_x, center_y = (x1 + x2) // 2, (y1 + y2) // 2
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side_len = int(max(x2 - x1, y2 - y1) * face_crop_scale)
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half_side = side_len // 2
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crop_y1, crop_x1 = max(center_y - half_side, 0), max(center_x - half_side, 0)
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crop_y2, crop_x2 = min(center_y + half_side, h), min(center_x + half_side, w)
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face_crop_bgr = frame_bgr[crop_y1:crop_y2, crop_x1:crop_x2]
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if face_crop_bgr.size > 0:
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face_resized = cv2.resize(face_crop_bgr, (512, 512), interpolation=cv2.INTER_AREA)
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face_rgb = cv2.cvtColor(face_resized, cv2.COLOR_BGR2RGB)
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face_tensor_in = torch.from_numpy(face_rgb.astype(np.float32) / 255.0).permute(2, 0, 1).unsqueeze(0).to(device)
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with torch.no_grad():
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normalized_face = normalize(face_tensor_in, [0.485, 0.456, 0.406], [0.229, 0.224, 0.225])
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parsing_map = parsing_model(normalized_face)[0].argmax(dim=1, keepdim=True)
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parsing_map_np = parsing_map.squeeze().cpu().numpy().astype(np.uint8)
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if with_neck:
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final_mask_512 = (parsing_map_np != 0).astype(np.uint8) * 255
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else:
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parts_to_exclude = [0, 14, 15, 16, 18]
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final_mask_512 = np.isin(parsing_map_np, parts_to_exclude, invert=True).astype(np.uint8) * 255
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if dilation_kernel_size > 0:
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kernel = cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (dilation_kernel_size, dilation_kernel_size))
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final_mask_512 = cv2.dilate(final_mask_512, kernel, iterations=1)
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mask_resized_to_crop = cv2.resize(final_mask_512, (face_crop_bgr.shape[1], face_crop_bgr.shape[0]), interpolation=cv2.INTER_NEAREST)
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full_mask_np[crop_y1:crop_y2, crop_x1:crop_x2] = mask_resized_to_crop
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# --- 2. Paste Image onto Frame ---
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# Use a copy to avoid modifying the original data
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target_frame_pil = tensor_to_pil(frame_tensor).copy()
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# Find the bounding box of the largest contour in the mask
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contours, _ = cv2.findContours(full_mask_np, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
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if contours:
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largest_contour = max(contours, key=cv2.contourArea)
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x, y, w_box, h_box = cv2.boundingRect(largest_contour)
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# Resize the face to paste to the size of the bounding box
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face_to_paste_resized = face_to_paste_pil.resize((w_box, h_box), Image.Resampling.LANCZOS)
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# Paste the resized face onto the target frame using its own alpha channel as the mask
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target_frame_pil.paste(face_to_paste_resized, (x, y), face_to_paste_resized)
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processed_np = np.array(target_frame_pil.convert("RGB")).astype(np.float32) / 255.0
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processed_tensor = torch.from_numpy(processed_np)
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processed_frames_tensors.append(processed_tensor)
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output_image_batch = torch.stack(processed_frames_tensors)
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return (output_image_batch,)
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NODE_CLASS_MAPPINGS = {
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"VideoInputPreprocessor": VideoInputPreprocessor,
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}
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NODE_DISPLAY_NAME_MAPPINGS = {
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"VideoInputPreprocessor": "Stand-In VideoInputPreprocessor",
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} |