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228 lines
8.5 KiB
228 lines
8.5 KiB
import argparse
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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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import torch
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from ultralytics.utils import ASSETS, yaml_load
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from ultralytics.utils.checks import check_requirements, check_yaml
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class Yolov8:
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def __init__(self, onnx_model, input_image, confidence_thres, iou_thres):
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"""
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Initializes an instance of the Yolov8 class.
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Args:
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onnx_model: Path to the ONNX model.
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input_image: Path to the input image.
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confidence_thres: Confidence threshold for filtering detections.
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iou_thres: IoU (Intersection over Union) threshold for non-maximum suppression.
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"""
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self.onnx_model = onnx_model
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self.input_image = input_image
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self.confidence_thres = confidence_thres
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self.iou_thres = iou_thres
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# Load the class names from the COCO dataset
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self.classes = yaml_load(check_yaml('coco128.yaml'))['names']
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# Generate a color palette for the classes
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self.color_palette = np.random.uniform(0, 255, size=(len(self.classes), 3))
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def draw_detections(self, img, box, score, class_id):
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"""
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Draws bounding boxes and labels on the input image based on the detected objects.
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Args:
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img: The input image to draw detections on.
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box: Detected bounding box.
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score: Corresponding detection score.
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class_id: Class ID for the detected object.
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Returns:
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None
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"""
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# Extract the coordinates of the bounding box
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x1, y1, w, h = box
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# Retrieve the color for the class ID
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color = self.color_palette[class_id]
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# Draw the bounding box on the image
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cv2.rectangle(img, (int(x1), int(y1)), (int(x1 + w), int(y1 + h)), color, 2)
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# Create the label text with class name and score
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label = f'{self.classes[class_id]}: {score:.2f}'
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# Calculate the dimensions of the label text
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(label_width, label_height), _ = cv2.getTextSize(label, cv2.FONT_HERSHEY_SIMPLEX, 0.5, 1)
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# Calculate the position of the label text
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label_x = x1
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label_y = y1 - 10 if y1 - 10 > label_height else y1 + 10
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# Draw a filled rectangle as the background for the label text
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cv2.rectangle(img, (label_x, label_y - label_height), (label_x + label_width, label_y + label_height), color,
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cv2.FILLED)
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# Draw the label text on the image
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cv2.putText(img, label, (label_x, label_y), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 0), 1, cv2.LINE_AA)
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def preprocess(self):
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"""
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Preprocesses the input image before performing inference.
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Returns:
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image_data: Preprocessed image data ready for inference.
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"""
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# Read the input image using OpenCV
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self.img = cv2.imread(self.input_image)
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# Get the height and width of the input image
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self.img_height, self.img_width = self.img.shape[:2]
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# Convert the image color space from BGR to RGB
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img = cv2.cvtColor(self.img, cv2.COLOR_BGR2RGB)
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# Resize the image to match the input shape
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img = cv2.resize(img, (self.input_width, self.input_height))
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# Normalize the image data by dividing it by 255.0
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image_data = np.array(img) / 255.0
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# Transpose the image to have the channel dimension as the first dimension
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image_data = np.transpose(image_data, (2, 0, 1)) # Channel first
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# Expand the dimensions of the image data to match the expected input shape
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image_data = np.expand_dims(image_data, axis=0).astype(np.float32)
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# Return the preprocessed image data
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return image_data
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def postprocess(self, input_image, output):
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"""
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Performs post-processing on the model's output to extract bounding boxes, scores, and class IDs.
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Args:
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input_image (numpy.ndarray): The input image.
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output (numpy.ndarray): The output of the model.
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Returns:
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numpy.ndarray: The input image with detections drawn on it.
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"""
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# Transpose and squeeze the output to match the expected shape
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outputs = np.transpose(np.squeeze(output[0]))
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# Get the number of rows in the outputs array
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rows = outputs.shape[0]
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# Lists to store the bounding boxes, scores, and class IDs of the detections
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boxes = []
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scores = []
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class_ids = []
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# Calculate the scaling factors for the bounding box coordinates
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x_factor = self.img_width / self.input_width
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y_factor = self.img_height / self.input_height
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# Iterate over each row in the outputs array
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for i in range(rows):
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# Extract the class scores from the current row
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classes_scores = outputs[i][4:]
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# Find the maximum score among the class scores
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max_score = np.amax(classes_scores)
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# If the maximum score is above the confidence threshold
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if max_score >= self.confidence_thres:
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# Get the class ID with the highest score
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class_id = np.argmax(classes_scores)
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# Extract the bounding box coordinates from the current row
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x, y, w, h = outputs[i][0], outputs[i][1], outputs[i][2], outputs[i][3]
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# Calculate the scaled coordinates of the bounding box
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left = int((x - w / 2) * x_factor)
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top = int((y - h / 2) * y_factor)
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width = int(w * x_factor)
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height = int(h * y_factor)
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# Add the class ID, score, and box coordinates to the respective lists
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class_ids.append(class_id)
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scores.append(max_score)
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boxes.append([left, top, width, height])
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# Apply non-maximum suppression to filter out overlapping bounding boxes
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indices = cv2.dnn.NMSBoxes(boxes, scores, self.confidence_thres, self.iou_thres)
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# Iterate over the selected indices after non-maximum suppression
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for i in indices:
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# Get the box, score, and class ID corresponding to the index
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box = boxes[i]
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score = scores[i]
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class_id = class_ids[i]
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# Draw the detection on the input image
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self.draw_detections(input_image, box, score, class_id)
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# Return the modified input image
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return input_image
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def main(self):
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"""
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Performs inference using an ONNX model and returns the output image with drawn detections.
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Returns:
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output_img: The output image with drawn detections.
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"""
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# Create an inference session using the ONNX model and specify execution providers
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session = ort.InferenceSession(self.onnx_model, providers=['CUDAExecutionProvider', 'CPUExecutionProvider'])
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# Get the model inputs
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model_inputs = session.get_inputs()
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# Store the shape of the input for later use
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input_shape = model_inputs[0].shape
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self.input_width = input_shape[2]
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self.input_height = input_shape[3]
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# Preprocess the image data
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img_data = self.preprocess()
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# Run inference using the preprocessed image data
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outputs = session.run(None, {model_inputs[0].name: img_data})
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# Perform post-processing on the outputs to obtain output image.
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return self.postprocess(self.img, outputs) # output image
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if __name__ == '__main__':
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# Create an argument parser to handle command-line arguments
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parser = argparse.ArgumentParser()
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parser.add_argument('--model', type=str, default='yolov8n.onnx', help='Input your ONNX model.')
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parser.add_argument('--img', type=str, default=str(ASSETS / 'bus.jpg'), help='Path to input image.')
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parser.add_argument('--conf-thres', type=float, default=0.5, help='Confidence threshold')
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parser.add_argument('--iou-thres', type=float, default=0.5, help='NMS IoU threshold')
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args = parser.parse_args()
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# Check the requirements and select the appropriate backend (CPU or GPU)
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check_requirements('onnxruntime-gpu' if torch.cuda.is_available() else 'onnxruntime')
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# Create an instance of the Yolov8 class with the specified arguments
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detection = Yolov8(args.model, args.img, args.conf_thres, args.iou_thres)
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# Perform object detection and obtain the output image
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output_image = detection.main()
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# Display the output image in a window
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cv2.namedWindow('Output', cv2.WINDOW_NORMAL)
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cv2.imshow('Output', output_image)
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# Wait for a key press to exit
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cv2.waitKey(0)
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