Object detection is a process of discovering real-world object detail in images or videos such as cars or bikes, TVs, flowers, and humans. It allows identification, localization, and identification of multiple objects within an image, giving us a better understanding of an image. It is used in applications such as image retrieval, security, surveillance, and the Advanced Driver Assistance System (ADAS).

Applications of Object Detection

Facial Recognition:
A deep learning facial recognition system called “Deep Face” has been developed by a group of researchers on Facebook, which very effectively identifies the human face in a digital image. Google Photos, which automatically separates all pictures based on the person in the picture. Many components are involved in facial recognition, such as face, nose, mouth, and eyebrow.

Industrial Quality Check:
Object detection is also used in the industrial process to identify products. Finding a specific object by visual inspection is an essential task that is involved in multiple industrial processes like inventory management, machining, quality management, packaging, sorting, etc.
Inventory management is very tricky as items are hard to track in real-time. Automatic localization and object counting allows for improving inventory accuracy.

Self-Driving Cars:
Self-driving cars are the future cars. But the working backside is very tricky like it combines a variety of techniques to perceive its atmosphere, including radar, laser light, GPS, odometry, and computer vision.
There are advanced control systems that interpret sensory information to identify appropriate navigation paths, as well as obstacles. Once ever the image sensor detects any sign of living thing in its way, it automatically stops. This happens at a rapid rate and is a big step towards Driverless cars.

People Counting:
Object detection can be used for people counting, and it is used for analyzing store performance or crowd figures during festivals. It tends to be more difficult as people move out of the frame quickly.
It is a critical application during crowd gathering; this feature can be used for multiple purposes.

Object Detection Workflow

Every object Detection algorithm is working in different teaching, but they all work on the same principle.
Feature Extraction: They extract the features from the input images at hand and use these features to determining the class of the picture. Be it through Mat Lab, Open CV, Viola-Jones, or Deep learning.

Prerequisites
• Python
• TensorFlow
• Tensorboard
• Protobuf v3.4 or above

Environment set-up

Now to download TensorFlow and TensorFlow GPU, we can use pip or conda commands which we have at the start.
Complete command

1. import numpy as np 
2. import os 
3. import zipfile 
4. import six.moves.urllib as urllib 
5. import sys 
6. import tarfile 
7. import tensorflow as tf 
8. from collections import defaultdict 
9. from matplotlib import pyplot as plt 
10. from PIL import Image 
11. from io import StringIO 
12. 
13. 
14. import cv2 
15. cap = cv2.VideoCapture(0) 
16. 
17. sys.path.append("..") 
18. from utils import visualization_utils as vis_util 
19. from utils import label_map_util 
20. 
21. MODEL_NAME = 'ssd_mobilenet_v1_coco_11_06_2017' 
22. MODEL_FILE = MODEL_NAME + '.tar.gz' 
23. DOWNLOAD_BASE = '<a href="http://download.tensorflow.org/models/object_detection/">http://download.tensorflow.org/models/object_detection/</a>' 
24. 
25. # Here, the path to frozen detection graph. 
26. PATH_TO_CKPT = MODEL_NAME + '/frozen_inference_graph.pb' 
27. 
28. # Here, list of the strings that are used to add a correct label for every box. 
29. PATH_TO_LABELS = os.path.join('data', 'mscoco_label_map.pbtxt') 
30. 
31. NUM_CLASSES = 90 
32. 
33. opener = urllib.request.URLopener() 
34. opener.retrieve(DOWNLOAD_BASE + MODEL_FILE, MODEL_FILE) 
35. tar_file = tarfile.open(MODEL_FILE) 
36. for file in tar_file.getmembers(): 
37. file_name = os.path.basename(file.name) 
38. if 'frozen_inference_graph.pb' in file_name: 
39. tar_file.extract(file, os.getcwd()) 
40. 
41. detection_graph = tf.Graph() 
42. with detection_graph.as_default(): 
43. od_graph_def = tf.GraphDef() 
44. with tf.gfile.GFile(PATH_TO_CKPT, 'rb') as fid: 
45. serialized_graph = fid.read() 
46. od_graph_def.ParseFromString(serialized_graph) 
47. tf.import_graph_def(od_graph_def, name='') 
48. 
49. label_map = label_map_util.load_labelmap(PATH_TO_LABELS) 
50. categories =label_map_util.convert_label_map_to_categories(label_map, max_num_classes=NUM_CLASSES, use_display_name=True) 
51. category_index = label_map_util.create_category_index (categories) 
52. 
53. with detection_graph.as_default(): 
54. with tf.Session(graph=detection_graph) as sess: 
55. while True: 
56. ret, image_np = cap.read() 
57. # Expanding the dimensions since the model expects images into the shape: [1, None, None, 3] 
58. image_np_expanded = np.expand_dims(image_np, axis=0) 
59. image_tensor = detection_graph.get_tensor_by_name('image_tensor:0') 
60. # Every box representing a part of the image where a particular object was detected. 
61. boxes = detection_graph.get_tensor_by_name('detection_boxes:0') 
62. scores = detection_graph.get_tensor_by_name('detection_scores:0') 
63. classes = detection_graph.get_tensor_by_name('detection_classes:0') 
64. num_detections = detection_graph.get_tensor_by_name('num_detections:0') 
65. #. 
66. (boxes, scores, classes, num_detections) = sess.run( 
67. [boxes, scores, classes, num_detections], 
68. feed_dict={image_tensor: image_np_expanded}) 
69. # Visualization of the results through detection. 
70. vis_util.visualize_boxes_and_labels_on_image_array( 
71. image_np, 
72. np.squeeze(boxes), 
73. np.squeeze(classes).astype(np.int32), 
74. np.squeeze(scores), 
75. category_index, 
76. use_normalized_coordinates=True, 
77. line_thickness=8) 
78. 
79. cv2.imshow('object detection', cv2.resize(image_np, (800,500))) 
80. if cv2.waitKey(0) & 0xFF == ord('q'): 
81. cv2.destroyAllWindows() 
82. break

Output-

So, this brings us to the end of blog. This Tecklearn ‘TensorFlow Object Detection’ blog helps you with commonly asked questions if you are looking out for a job in Artificial Intelligence. If you wish to learn Artificial Intelligence and build a career in AI or Machine Learning domain, then check out our interactive, Artificial Intelligence and Deep Learning with TensorFlow Training, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

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• What is Deep Learning?
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• Real-Life use cases of Deep Learning
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• Pre-requisites for AI & DL
• Python Programming Language
• Installation & IDE
Environment Set Up and Essentials
• Installation
• Python – NumPy
• Python for Data Science and AI
• Python Language Essentials
• Python Libraries – Numpy and Pandas
• Numpy for Mathematical Computing
More Prerequisites for Deep Learning and AI
• Pandas for Data Analysis
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• Normalization
• Data Set
• Machine Learning Concepts
• Regression
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• Activation Functions
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• What is TensorFlow?
• TensorFlow code-basics
• Graph Visualization
• Constants, Placeholders, Variables
Multi-layered Neural Networks
• Error Back propagation issues
• Drop outs
Regularization techniques in Deep Learning
Deep Learning Libraries
• Tensorflow
• Keras
• OpenCV
• SkImage
• PIL
Building of Simple Neural Network from Scratch from Simple Equation
• Training the model
Dual Equation Neural Network
• TensorFlow
• Predicting Algorithm
Introduction to Keras API
• Define Keras
• How to compose Models in Keras
• Sequential Composition
• Functional Composition
• Predefined Neural Network Layers
• What is Batch Normalization
• Saving and Loading a model with Keras
• Customizing the Training Process
• Using TensorBoard with Keras
• Use-Case Implementation with Keras
GPU in Deep Learning
• Introduction to GPUs and how they differ from CPUs
• Importance of GPUs in training Deep Learning Networks
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• Keras Model Saving and Reusing
• Deploying Keras with TensorBoard
Keras Cat Vs Dog Modelling
• Activation Functions in Neural Network
Optimization Techniques
• Some Examples for Neural Network
Convolutional Neural Networks (CNN)
• Introduction to CNNs
• CNNs Application
• Architecture of a CNN
• Convolution and Pooling layers in a CNN
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RNN: Recurrent Neural Networks
• Introduction to RNN Model
• Application use cases of RNN
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Application of Deep Learning in image recognition, NLP and more
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