В данной статье хочу рассказать про поиск объектов на видео с помощью Python и OpenCV. Помимо обычных видео, можно использовать и камеры.
Полный код и все исходники можно найти на моем Github.
Данный проект является продолжением моей предыдущей статьи - Поиск объектов на фото с помощью Python. Для того, чтобы не тратить много времени на ее изучение, я распишу весь процесс по новой.
Для того, чтобы написать легковесное приложение для обнаружения объектов на видео, установим необходимые библиотеки:
pip install opencv-python
pip install numpy
pip install artПерейдем к написанию самого приложения, которое будет находить объекты на видео при помощи YOLO и отмечать их.
Скачаем с моего Github исходники и поместим в директорию Resources в проекте. Посмотрим, какие объекты сможет определять наша будущая программа:
'person', 'bicycle', 'car', 'motorbike', 'aeroplane', 'bus', 'train', 'truck', 'boat', 'traffic light',
'fire hydrant', 'stop sign', 'parking meter', 'bench', 'bird', 'cat', 'dog', 'horse', 'sheep', 'cow',
'elephant', 'bear', 'zebra', 'giraffe', 'backpack', 'umbrella', 'handbag', 'tie', 'suitcase', 'frisbee',
'skis', 'snowboard', 'sports ball', 'kite', 'baseball bat', 'baseball glove', 'skateboard', 'surfboard',
'tennis racket', 'bottle', 'wine glass', 'cup', 'fork', 'knife', 'spoon', 'bowl', 'banana', 'apple',
'sandwich', 'orange', 'broccoli', 'carrot', 'hot dog', 'pizza', 'donut', 'cake', 'chair', 'sofa',
'pottedplant', 'bed', 'diningtable', 'toilet', 'tvmonitor', 'laptop', 'mouse', 'remote', 'keyboard',
'cell phone', 'microwave', 'oven', 'toaster', 'sink', 'refrigerator', 'book', 'clock', 'vase', 'scissors',
'teddy bear', 'hair drier', 'toothbrush'Первым делом импортируем необходимые библиотеки:
import cv2
import numpy as np
from art import tprintНапишем функции для применения YOLO. С ее помощью определяются самые вероятные классы объектов на изображении, а также координаты их границ, которые в дальнейшем будут использованы для отрисовки.
def apply_yolo_object_detection(image_to_process):
"""
Recognition and determination of the coordinates of objects on the image
:param image_to_process: original image
:return: image with marked objects and captions to them
"""
height, width, _ = image_to_process.shape
blob = cv2.dnn.blobFromImage(image_to_process, <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">1</span> / <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">255</span>, (<span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">608</span>, <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">608</span>),
(<span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">0</span>, <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">0</span>, <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">0</span>), swapRB=<span class="hljs-literal" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">True</span>, crop=<span class="hljs-literal" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">False</span>)
net.setInput(blob)
outs = net.forward(out_layers)
class_indexes, class_scores, boxes = ([] <span class="hljs-keyword" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; font-weight: 700; color: rgb(137, 89, 168); quotes: "«" "»";">for</span> i <span class="hljs-keyword" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; font-weight: 700; color: rgb(137, 89, 168); quotes: "«" "»";">in</span> range(<span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">3</span>))
objects_count = <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">0</span>
<span class="hljs-comment" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(142, 144, 140); quotes: "«" "»";"># Starting a search for objects in an image</span>
<span class="hljs-keyword" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; font-weight: 700; color: rgb(137, 89, 168); quotes: "«" "»";">for</span> out <span class="hljs-keyword" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; font-weight: 700; color: rgb(137, 89, 168); quotes: "«" "»";">in</span> outs:
<span class="hljs-keyword" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; font-weight: 700; color: rgb(137, 89, 168); quotes: "«" "»";">for</span> obj <span class="hljs-keyword" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; font-weight: 700; color: rgb(137, 89, 168); quotes: "«" "»";">in</span> out:
scores = obj[<span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">5</span>:]
class_index = np.argmax(scores)
class_score = scores[class_index]
<span class="hljs-keyword" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; font-weight: 700; color: rgb(137, 89, 168); quotes: "«" "»";">if</span> class_score > <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">0</span>:
center_x = int(obj[<span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">0</span>] * width)
center_y = int(obj[<span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">1</span>] * height)
obj_width = int(obj[<span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">2</span>] * width)
obj_height = int(obj[<span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">3</span>] * height)
box = [center_x - obj_width // <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">2</span>, center_y - obj_height // <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">2</span>,
obj_width, obj_height]
boxes.append(box)
class_indexes.append(class_index)
class_scores.append(float(class_score))
<span class="hljs-comment" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(142, 144, 140); quotes: "«" "»";"># Selection</span>
chosen_boxes = cv2.dnn.NMSBoxes(boxes, class_scores, <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">0.0</span>, <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">0.4</span>)
<span class="hljs-keyword" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; font-weight: 700; color: rgb(137, 89, 168); quotes: "«" "»";">for</span> box_index <span class="hljs-keyword" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; font-weight: 700; color: rgb(137, 89, 168); quotes: "«" "»";">in</span> chosen_boxes:
box_index = box_index
box = boxes[box_index]
class_index = class_indexes[box_index]
<span class="hljs-comment" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(142, 144, 140); quotes: "«" "»";"># For debugging, we draw objects included in the desired classes</span>
<span class="hljs-keyword" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; font-weight: 700; color: rgb(137, 89, 168); quotes: "«" "»";">if</span> classes[class_index] <span class="hljs-keyword" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; font-weight: 700; color: rgb(137, 89, 168); quotes: "«" "»";">in</span> classes_to_look_for:
objects_count += <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">1</span>
image_to_process = draw_object_bounding_box(image_to_process,
class_index, box)
final_image = draw_object_count(image_to_process, objects_count)
<span class="hljs-keyword" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; font-weight: 700; color: rgb(137, 89, 168); quotes: "«" "»";">return</span> final_image
Добавим функцию, которая обведет найденные на изображении объекты с помощью координат границ, полученных из функции apply_yolo_object_detection:
def draw_object_bounding_box(image_to_process, index, box):
"""
Drawing object borders with captions
:param image_to_process: original image
:param index: index of object class defined with YOLO
:param box: coordinates of the area around the object
:return: image with marked objects
"""
x, y, w, h = box
start = (x, y)
end = (x + w, y + h)
color = (<span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">0</span>, <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">255</span>, <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">0</span>)
width = <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">2</span>
final_image = cv2.rectangle(image_to_process, start, end, color, width)
start = (x, y - <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">10</span>)
font_size = <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">1</span>
font = cv2.FONT_HERSHEY_SIMPLEX
width = <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">2</span>
text = classes[index]
final_image = cv2.putText(final_image, text, start, font,
font_size, color, width, cv2.LINE_AA)
<span class="hljs-keyword" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; font-weight: 700; color: rgb(137, 89, 168); quotes: "«" "»";">return</span> final_image
Помимо отрисовки объектов, можно добавить вывод их количества. Напишем для этого еще одну функцию:
def draw_object_count(image_to_process, objects_count):
"""
Signature of the number of found objects in the image
:param image_to_process: original image
:param objects_count: the number of objects of the desired class
:return: image with labeled number of found objects
"""
start = (<span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">10</span>, <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">120</span>)
font_size = <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">1.5</span>
font = cv2.FONT_HERSHEY_SIMPLEX
width = <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">3</span>
text = <span class="hljs-string" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(113, 140, 0); quotes: "«" "»";">"Objects found: "</span> + str(objects_count)
<span class="hljs-comment" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(142, 144, 140); quotes: "«" "»";"># Text output with a stroke</span>
<span class="hljs-comment" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(142, 144, 140); quotes: "«" "»";"># (so that it can be seen in different lighting conditions of the picture)</span>
white_color = (<span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">255</span>, <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">255</span>, <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">255</span>)
black_outline_color = (<span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">0</span>, <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">0</span>, <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">0</span>)
final_image = cv2.putText(image_to_process, text, start, font, font_size,
black_outline_color, width * <span class="hljs-number" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; color: rgb(245, 135, 31); quotes: "«" "»";">3</span>, cv2.LINE_AA)
final_image = cv2.putText(final_image, text, start, font, font_size,
white_color, width, cv2.LINE_AA)
<span class="hljs-keyword" style="transition: opacity 0.2s ease-in-out 0s, color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s, background-color 0.2s ease-in-out 0s, -webkit-text-decoration 0.2s ease-in-out 0s; font-weight: 700; color: rgb(137, 89, 168); quotes: "«" "»";">return</span> final_image</code></pre><!--EndFragment-->
Напишем функцию, которая будет обрабатывать видео по кадрам и выводить результат обработки на экран:
def start_video_object_detection(video: str):
"""
Real-time video capture and analysis
"""
while True:
try:
# Capturing a picture from a video
video_camera_capture = cv2.VideoCapture(video)
while video_camera_capture.isOpened():
ret, frame = video_camera_capture.read()
if not ret:
break
# Application of object recognition methods on a video frame from YOLO
frame = apply_yolo_object_detection(frame)
# Displaying the processed image on the screen with a reduced window size
frame = cv2.resize(frame, (1920 // 2, 1080 // 2))
cv2.imshow("Video Capture", frame)
cv2.waitKey(1)
video_camera_capture.release()
cv2.destroyAllWindows()
except KeyboardInterrupt:
passЧтобы не нагружать устройство обработкой каждого кадра, можно добавить обновление экрана по нажатии любой клавиши:
def start_video_object_detection(video: str):
"""
Real-time video capture and analysis
"""
while True:
try:
# Capturing a picture from a video
video_camera_capture = cv2.VideoCapture(video)
while video_camera_capture.isOpened():
ret, frame = video_camera_capture.read()
if not ret:
break
# Application of object recognition methods on a video frame from YOLO
frame = apply_yolo_object_detection(frame)
# Displaying the processed image on the screen with a reduced window size
frame = cv2.resize(frame, (1920 // 2, 1080 // 2))
cv2.imshow("Video Capture", frame)
cv2.waitKey(0):
break
video_camera_capture.release()
cv2.destroyAllWindows()
except KeyboardInterrupt:
passТеперь напишем функцию main, где будем передавать аргументы в функции.
Данный блок не является обязательным, но я захотел сделать красивый вывод текста в консоль:
# Logo
tprint("Object detection")
tprint("by")
tprint("paveldat")Создадим функцию main, в которой настроим нашу сеть:
if __name__ == '__main__':
# Loading YOLO scales from files and setting up the network
net = cv2.dnn.readNetFromDarknet("Resources/yolov4-tiny.cfg",
"Resources/yolov4-tiny.weights")
layer_names = net.getLayerNames()
out_layers_indexes = net.getUnconnectedOutLayers()
out_layers = [layer_names[index - 1] for index in out_layers_indexes]
# Loading from a file of object classes that YOLO can detect
with open("Resources/coco.names.txt") as file:
classes = file.read().split("\n")
# Determining classes that will be prioritized for search in an image
# The names are in the file coco.names.txt
video = input("Path to video (or URL): ")
look_for = input("What we are looking for: ").split(',')
# Delete spaces
list_look_for = []
for look in look_for:
list_look_for.append(look.strip())
classes_to_look_for = list_look_for
start_video_object_detection(video)Программа будет запрашивать путь до видео и объекты, которые хотим найти. Вместо пути до видео можно использовать ссылку на видео с камеры. Объекты должны перечисляться через запятую, если их несколько.
Запускаем программу и тестируем.
Path to video (or URL): Result/input/example.mp4
What we are looking for: person, car, busИсходное видео:
Обработанное видео:
Мы проверили, как алгоритм YOLO справился с тестам. Погрешность все же есть, но в основном программа успешно находит необходимые объекты.
petlen1
Хоть кто-то найдет второй потерянный носок)