import time
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import cv2
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import numpy as np
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import onnxruntime
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class SAFETY_DETECT:
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def __init__(self, path, conf_thres=0.35, iou_thres=0.5):
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self.conf_threshold = conf_thres
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self.iou_threshold = iou_thres
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# Initialize model
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self.initialize_model(path)
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self.color_palette = [(np.random.randint(0, 255), np.random.randint(0, 255), np.random.randint(0, 255)) for _ in
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range(100)]
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def __call__(self, image):
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return self.detect_objects(image)
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def initialize_model(self, path):
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self.session = onnxruntime.InferenceSession(path, providers=['CPUExecutionProvider'])
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self.class_names = eval(self.session.get_modelmeta().custom_metadata_map['names'])
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# Get model info
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self.get_input_details()
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self.get_output_details()
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def detect_objects(self, image):
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input_tensor, ratio = self.prepare_input(image)
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# Perform inference on the image
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outputs = self.inference(input_tensor)
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self.boxes, self.scores, self.class_ids = self.process_output(outputs, ratio)
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return self.boxes, self.scores, self.class_ids
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def prepare_input(self, image):
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self.img_height, self.img_width = image.shape[:2]
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input_img = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
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# Resize图片不要直接使用resize，需要按比例缩放，空白区域填空纯色即可
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input_img, ratio = self.ratioresize(input_img)
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# Scale input pixel values to 0 to 1
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input_img = input_img / 255.0
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input_img = input_img.transpose(2, 0, 1)
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input_tensor = input_img[np.newaxis, :, :, :].astype(np.float32)
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return input_tensor, ratio
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def inference(self, input_tensor):
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start = time.perf_counter()
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outputs = self.session.run(self.output_names, {self.input_names[0]: input_tensor})
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# print(f"Inference time: {(time.perf_counter() - start)*1000:.2f} ms")
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return outputs
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def process_output(self, output, ratio):
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predictions = np.squeeze(output[0]).T
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# Filter out object confidence scores below threshold
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scores = np.max(predictions[:, 4:], axis=1)
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predictions = predictions[scores > self.conf_threshold, :]
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scores = scores[scores > self.conf_threshold]
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if len(scores) == 0:
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return [], [], []
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# Get the class with the highest confidence
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class_ids = np.argmax(predictions[:, 4:], axis=1)
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# Get bounding boxes for each object
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boxes = self.extract_boxes(predictions, ratio)
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# Apply non-maxima suppression to suppress weak, overlapping bounding boxes
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indices = self.nms(boxes, scores, self.iou_threshold)
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return boxes[indices], scores[indices], class_ids[indices]
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def extract_boxes(self, predictions, ratio):
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# Extract boxes from predictions
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boxes = predictions[:, :4]
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# Scale boxes to original image dimensions
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# boxes = self.rescale_boxes(boxes)
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boxes *= ratio
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# Convert boxes to xyxy format
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boxes = self.xywh2xyxy(boxes)
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return boxes
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def rescale_boxes(self, boxes):
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# Rescale boxes to original image dimensions
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input_shape = np.array([self.input_width, self.input_height, self.input_width, self.input_height])
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boxes = np.divide(boxes, input_shape, dtype=np.float32)
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boxes *= np.array([self.img_width, self.img_height, self.img_width, self.img_height])
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return boxes
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def get_input_details(self):
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model_inputs = self.session.get_inputs()
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self.input_names = [model_inputs[i].name for i in range(len(model_inputs))]
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self.input_shape = model_inputs[0].shape
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self.input_height = self.input_shape[2]
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self.input_width = self.input_shape[3]
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def get_output_details(self):
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model_outputs = self.session.get_outputs()
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self.output_names = [model_outputs[i].name for i in range(len(model_outputs))]
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# 等比例缩放图片
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def ratioresize(self, im, color=114):
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shape = im.shape[:2]
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new_h, new_w = self.input_height, self.input_width
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padded_img = np.ones((new_h, new_w, 3), dtype=np.uint8) * color
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# Scale ratio (new / old)
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r = min(new_h / shape[0], new_w / shape[1])
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# Compute padding
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new_unpad = int(round(shape[1] * r)), int(round(shape[0] * r))
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if shape[::-1] != new_unpad:
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im = cv2.resize(im, new_unpad, interpolation=cv2.INTER_LINEAR)
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padded_img[: new_unpad[1], : new_unpad[0]] = im
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padded_img = np.ascontiguousarray(padded_img)
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return padded_img, 1 / r
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def nms(self, boxes, scores, iou_threshold):
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# Sort by score
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sorted_indices = np.argsort(scores)[::-1]
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keep_boxes = []
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while sorted_indices.size > 0:
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# Pick the last box
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box_id = sorted_indices[0]
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keep_boxes.append(box_id)
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# Compute IoU of the picked box with the rest
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ious = self.compute_iou(boxes[box_id, :], boxes[sorted_indices[1:], :])
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# Remove boxes with IoU over the threshold
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keep_indices = np.where(ious < iou_threshold)[0]
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# print(keep_indices.shape, sorted_indices.shape)
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sorted_indices = sorted_indices[keep_indices + 1]
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return keep_boxes
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def compute_iou(self, box, boxes):
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# Compute xmin, ymin, xmax, ymax for both boxes
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xmin = np.maximum(box[0], boxes[:, 0])
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ymin = np.maximum(box[1], boxes[:, 1])
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xmax = np.minimum(box[2], boxes[:, 2])
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ymax = np.minimum(box[3], boxes[:, 3])
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# Compute intersection area
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intersection_area = np.maximum(0, xmax - xmin) * np.maximum(0, ymax - ymin)
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# Compute union area
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box_area = (box[2] - box[0]) * (box[3] - box[1])
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boxes_area = (boxes[:, 2] - boxes[:, 0]) * (boxes[:, 3] - boxes[:, 1])
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union_area = box_area + boxes_area - intersection_area
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# Compute IoU
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iou = intersection_area / union_area
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return iou
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def xywh2xyxy(self, x):
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# Convert bounding box (x, y, w, h) to bounding box (x1, y1, x2, y2)
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y = np.copy(x)
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y[..., 0] = x[..., 0] - x[..., 2] / 2
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y[..., 1] = x[..., 1] - x[..., 3] / 2
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y[..., 2] = x[..., 0] + x[..., 2] / 2
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y[..., 3] = x[..., 1] + x[..., 3] / 2
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return y
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def draw_detections(self, image, boxes, scores, class_ids, mask_alpha=0.3):
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det_img = image.copy()
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img_height, img_width = image.shape[:2]
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font_size = min([img_height, img_width]) * 0.0006
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text_thickness = int(min([img_height, img_width]) * 0.001)
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det_img = self.draw_masks(det_img, boxes, class_ids, mask_alpha)
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# Draw bounding boxes and labels of detections
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for class_id, box, score in zip(class_ids, boxes, scores):
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color = self.color_palette[class_id]
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self.draw_box(det_img, box, color)
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label = self.class_names[class_id]
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caption = f'{label} {int(score * 100)}%'
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self.draw_text(det_img, caption, box, color, font_size, text_thickness)
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return det_img
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def draw_box(self, image: np.ndarray, box: np.ndarray, color: tuple[int, int, int] = (0, 0, 255),
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thickness: int = 2) -> np.ndarray:
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x1, y1, x2, y2 = box.astype(int)
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return cv2.rectangle(image, (x1, y1), (x2, y2), color, thickness)
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def draw_text(self, image: np.ndarray, text: str, box: np.ndarray, color: tuple[int, int, int] = (0, 0, 255),
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font_size: float = 0.001, text_thickness: int = 2) -> np.ndarray:
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x1, y1, x2, y2 = box.astype(int)
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(tw, th), _ = cv2.getTextSize(text=text, fontFace=cv2.FONT_HERSHEY_SIMPLEX,
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fontScale=font_size, thickness=text_thickness)
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th = int(th * 1.2)
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cv2.rectangle(image, (x1, y1),
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(x1 + tw, y1 - th), color, -1)
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return cv2.putText(image, text, (x1, y1), cv2.FONT_HERSHEY_SIMPLEX, font_size, (255, 255, 255), text_thickness,
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cv2.LINE_AA)
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def draw_masks(self, image: np.ndarray, boxes: np.ndarray, classes: np.ndarray, mask_alpha: float = 0.3) -> np.ndarray:
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mask_img = image.copy()
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# Draw bounding boxes and labels of detections
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for box, class_id in zip(boxes, classes):
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color = self.color_palette[class_id]
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x1, y1, x2, y2 = box.astype(int)
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# Draw fill rectangle in mask image
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cv2.rectangle(mask_img, (x1, y1), (x2, y2), color, -1)
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return cv2.addWeighted(mask_img, mask_alpha, image, 1 - mask_alpha, 0)
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