NEW Demo - Play back a web camera using OpenCV.. with a GUI

Demo_OpenCV_Webcam.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+import sys
+if sys.version_info[0] >= 3:
+    import PySimpleGUI as sg
+else:
+    import PySimpleGUI27 as sg
+import cv2 as cv
+from PIL import Image
+import io
+from sys import exit as exit
+
+"""
+Demo program that displays a webcam using OpenCV
+"""
+def main():
+
+    sg.ChangeLookAndFeel('LightGreen')
+
+    # define the window layout
+    layout = [[sg.Text('OpenCV Demo', size=(40, 1), justification='center', font='Helvetica 20')],
+              [sg.Image(filename='', key='image')],
+              [sg.ReadButton('Exit', size=(10, 1), pad=((200, 0), 3), font='Helvetica 14'),
+               sg.RButton('About', size=(10,1), font='Any 14')]]
+
+    # create the window and show it without the plot
+    window = sg.Window('Demo Application - OpenCV Integration',
+                       location=(800,400))
+    window.Layout(layout)
+    window.ReadNonBlocking()
+
+    # ---===--- Event LOOP Read and display frames, operate the GUI --- #
+    cap = cv.VideoCapture(0)
+    while True:
+        button, values = window.ReadNonBlocking()
+
+        if button is 'Exit' or values is None:
+            sys.exit(0)
+        elif button == 'About':
+            sg.PopupNoWait('Made with PySimpleGUI',
+                           'www.PySimpleGUI.org',
+                           'Check out how the video keeps playing behind this window.',
+                           'I finally figured out how to display frames from a webcam.',
+                           'ENJOY!  Go make something really cool with this... please!',
+                           keep_on_top=True)
+
+        ret, frame = cap.read()
+
+        gray = cv.cvtColor(frame, cv.COLOR_BGR2GRAY)
+
+        # let img be the PIL image
+        img = Image.fromarray(gray)  # create PIL image from frame
+        bio = io.BytesIO()  # a binary memory resident stream
+        img.save(bio, format= 'PNG')  # save image as png to it
+        imgbytes = bio.getvalue()  # this can be used by OpenCV hopefully
+        window.FindElement('image').Update(data=imgbytes)
+
+main()