from typing import Tuple, List import cv2 import numpy as np import supervision as sv import torch from PIL import Image from torchvision.ops import box_convert import groundingdino.datasets.transforms as T from groundingdino.models import build_model from groundingdino.util.misc import clean_state_dict from groundingdino.util.slconfig import SLConfig from groundingdino.util.utils import get_phrases_from_posmap def preprocess_caption(caption: str) -> str: result = caption.lower().strip() if result.endswith("."): return result return result + "." def load_model(model_config_path: str, model_checkpoint_path: str, device: str = "cuda"): args = SLConfig.fromfile(model_config_path) args.device = device model = build_model(args) checkpoint = torch.load(model_checkpoint_path, map_location="cpu") model.load_state_dict(clean_state_dict(checkpoint["model"]), strict=False) model.eval() return model def load_image(image_path: str) -> Tuple[np.array, torch.Tensor]: transform = T.Compose( [ T.RandomResize([800], max_size=1333), T.ToTensor(), T.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225]), ] ) image_source = Image.open(image_path).convert("RGB") image = np.asarray(image_source) image_transformed, _ = transform(image_source, None) return image, image_transformed def predict( model, image: torch.Tensor, caption: str, box_threshold: float, text_threshold: float, device: str = "cuda" ) -> Tuple[torch.Tensor, torch.Tensor, List[str]]: caption = preprocess_caption(caption=caption) model = model.to(device) image = image.to(device) with torch.no_grad(): outputs = model(image[None], captions=[caption]) prediction_logits = outputs["pred_logits"].cpu().sigmoid()[0] # prediction_logits.shape = (nq, 256) prediction_boxes = outputs["pred_boxes"].cpu()[0] # prediction_boxes.shape = (nq, 4) mask = prediction_logits.max(dim=1)[0] > box_threshold logits = prediction_logits[mask] # logits.shape = (n, 256) boxes = prediction_boxes[mask] # boxes.shape = (n, 4) tokenizer = model.tokenizer tokenized = tokenizer(caption) phrases = [ get_phrases_from_posmap(logit > text_threshold, tokenized, tokenizer).replace('.', '') for logit in logits ] return boxes, logits.max(dim=1)[0], phrases def annotate(image_source: np.ndarray, boxes: torch.Tensor, logits: torch.Tensor, phrases: List[str]) -> np.ndarray: h, w, _ = image_source.shape boxes = boxes * torch.Tensor([w, h, w, h]) xyxy = box_convert(boxes=boxes, in_fmt="cxcywh", out_fmt="xyxy").numpy() detections = sv.Detections(xyxy=xyxy) labels = [ f"{phrase} {logit:.2f}" for phrase, logit in zip(phrases, logits) ] box_annotator = sv.BoxAnnotator() annotated_frame = cv2.cvtColor(image_source, cv2.COLOR_RGB2BGR) annotated_frame = box_annotator.annotate(scene=annotated_frame, detections=detections, labels=labels) return annotated_frame