# Copyright © 2020 Arm Ltd and Contributors. All rights reserved. | |
# SPDX-License-Identifier: MIT | |
""" | |
Object detection demo that takes a video stream from a device, runs inference | |
on each frame producing bounding boxes and labels around detected objects, | |
and displays a window with the latest processed frame. | |
""" | |
import os | |
import cv2 | |
import pyarmnn as ann | |
from tqdm import tqdm | |
from argparse import ArgumentParser | |
from ssd import ssd_processing, ssd_resize_factor | |
from yolo import yolo_processing, yolo_resize_factor | |
from utils import create_network, dict_labels, preprocess, execute_network, draw_bounding_boxes | |
parser = ArgumentParser() | |
parser.add_argument('--video_source', type=int, default=0, | |
help='Device index to access video stream. Defaults to primary device camera at index 0') | |
parser.add_argument('--model_file_path', required=True, type=str, | |
help='Path to the Object Detection model to use') | |
parser.add_argument('--model_name', required=True, type=str, | |
help='The name of the model being used. Accepted options: ssd_mobilenet_v1, yolo_v3_tiny') | |
parser.add_argument('--label_path', type=str, | |
help='Path to the labelset for the provided model file') | |
parser.add_argument('--preferred_backends', type=str, nargs='+', default=['CpuAcc', 'CpuRef'], | |
help='Takes the preferred backends in preference order, separated by whitespace, ' | |
'for example: CpuAcc GpuAcc CpuRef. Accepted options: [CpuAcc, CpuRef, GpuAcc]. ' | |
'Defaults to [CpuAcc, CpuRef]') | |
args = parser.parse_args() | |
def init_video(video_source: int): | |
""" | |
Creates a video capture object from a device. | |
Args: | |
video_source: Device index used to read video stream. | |
Returns: | |
Video capture object used to capture frames from a video stream. | |
""" | |
video = cv2.VideoCapture(video_source) | |
if not video.isOpened: | |
raise RuntimeError(f'Failed to open video capture for device with index: {video_source}') | |
print('Processing video stream. Press \'Esc\' key to exit the demo.') | |
return video | |
def get_model_processing(model_name: str, video: cv2.VideoCapture, input_binding_info: tuple): | |
""" | |
Gets model-specific information such as model labels and decoding and processing functions. | |
The user can include their own network and functions by adding another statement. | |
Args: | |
model_name: Name of type of supported model. | |
video: Video capture object, contains information about data source. | |
input_binding_info: Contains shape of model input layer, used for scaling bounding boxes. | |
Returns: | |
Model labels, decoding and processing functions. | |
""" | |
if model_name == 'ssd_mobilenet_v1': | |
labels = os.path.join('ssd_labels.txt') | |
return labels, ssd_processing, ssd_resize_factor(video) | |
elif model_name == 'yolo_v3_tiny': | |
labels = os.path.join('yolo_labels.txt') | |
return labels, yolo_processing, yolo_resize_factor(video, input_binding_info) | |
else: | |
raise ValueError(f'{model_name} is not a valid model name') | |
def main(args): | |
video = init_video(args.video_source) | |
net_id, runtime, input_binding_info, output_binding_info = create_network(args.model_file_path, | |
args.preferred_backends) | |
output_tensors = ann.make_output_tensors(output_binding_info) | |
labels, process_output, resize_factor = get_model_processing(args.model_name, video, input_binding_info) | |
labels = dict_labels(labels if args.label_path is None else args.label_path) | |
while True: | |
frame_present, frame = video.read() | |
frame = cv2.flip(frame, 1) # Horizontally flip the frame | |
if not frame_present: | |
raise RuntimeError('Error reading frame from video stream') | |
input_tensors = preprocess(frame, input_binding_info) | |
inference_output = execute_network(input_tensors, output_tensors, runtime, net_id) | |
detections = process_output(inference_output) | |
draw_bounding_boxes(frame, detections, resize_factor, labels) | |
cv2.imshow('PyArmNN Object Detection Demo', frame) | |
if cv2.waitKey(1) == 27: | |
print('\nExit key activated. Closing video...') | |
break | |
video.release(), cv2.destroyAllWindows() | |
if __name__ == '__main__': | |
main(args) |