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OpenCV 4 for Secret Agents

You're reading from   OpenCV 4 for Secret Agents Use OpenCV 4 in secret projects to classify cats, reveal the unseen, and react to rogue drivers

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Product type Paperback
Published in Apr 2019
Publisher Packt
ISBN-13 9781789345360
Length 336 pages
Edition 2nd Edition
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Authors (2):
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Joseph Howse Joseph Howse
Author Profile Icon Joseph Howse
Joseph Howse
Arun Ponnusamy Arun Ponnusamy
Author Profile Icon Arun Ponnusamy
Arun Ponnusamy
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Table of Contents (16) Chapters Close

Preface 1. Section 1: The Briefing FREE CHAPTER
2. Preparing for the Mission 3. Searching for Luxury Accommodations Worldwide 4. Section 2: The Chase
5. Training a Smart Alarm to Recognize the Villain and His Cat 6. Controlling a Phone App with Your Suave Gestures 7. Equipping Your Car with a Rearview Camera and Hazard Detection 8. Creating a Physics Simulation Based on a Pen and Paper Sketch 9. Section 3: The Big Reveal
10. Seeing a Heartbeat with a Motion-Amplifying Camera 11. Stopping Time and Seeing like a Bee 12. Making WxUtils.py Compatible with Raspberry Pi
13. Learning More about Feature Detection in OpenCV
14. Running with Snakes (or, First Steps with Python)
15. Other Books You May Enjoy

Capturing images from industrial cameras using PySpin

Let's create a file called PySpinCapture.py. Not surprisingly, we will begin its implementation with the following import statements:

import PySpin
import cv2

As a practical introduction to PySpin, let's add the following function, which returns the number of PySpin-compatible cameras currently connected to the system:

def getNumCameras():
system = PySpin.System.GetInstance()
numCameras = len(system.GetCameras())
system.ReleaseInstance()
return numCameras

Here, we see that our standalone getNumCameras function (like any self-contained module of code that uses PySpin) is responsible for acquiring and releasing a reference to the PySpin system. We also see that the PySpin system is a gateway, providing access to any connected PySpin-compatible cameras.

Our primary goal in this file is to implement a class...

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