CV_10_4_cvSplit_Merge.py

'''THis is an amalgamation of CV_10_3 where a ROI is found with mouseclicks and then used to move the ROI into the photo

AI for everyone Lesson 11 and Lesson 11 Homework is a nice review 
python -m venv .venv
source .venv/bin/activate
use the pyenv
use the 3.9.6 ('pyenv':venv)  version in the interpreter!!

www.fourcc.org/codecs.php   video codes by fourcc, compressed formats  that you see displayed when you don't have the right CODEC installed to play a given AVI file
https://gist.github.com/takuma7/44f9ecb028ff00e2132e this deals with fourcc codes for mac
also read about "HAP codec"

'''
import sys
import cv2
print(cv2.__version__)
import numpy as np
print(f"This is version {sys.version}")
print(np.__version__)
width=640
height=360
evt =0
Radius =10
Thickness = 2
Color = [255,255,0]
def mouseClick(event,xPos,yPos,flags,params):
    global evt
    global pnt1
    global pnt2
    if event ==cv2.EVENT_LBUTTONDOWN:
        print('Event Left Down = ',event)
        print('xPos: ',xPos,' yPos ',yPos)
        pnt1=(xPos,yPos)
        evt = event
    if event ==cv2.EVENT_LBUTTONUP:
        print('Event Left Up = ',event)
        print('xPos: ',xPos,' yPos ',yPos)
        pnt2=(xPos,yPos)
        evt = event
    if event ==cv2.EVENT_RBUTTONUP:
        print('Event Right Up = ',event)
        print('xPos: ',xPos,' yPos ',yPos)
        
        evt = event
        
cam =cv2.VideoCapture(0)    # to access webcam
# cam = cv2.VideoCapture('/Users/judsonbelmont/Documents/Projects/OpenCV_2/images/myQuicktime_1.mov')
# fourcc = cv2.VideoWriter_fourcc(*'mp4v')
# out = cv2.VideoWriter('output.MOV',fourcc,20.0, (640,480))
print(cam.isOpened())
print(cam.get(cv2.CAP_PROP_FRAME_WIDTH))
print(cam.get(cv2.CAP_PROP_FRAME_HEIGHT))
print(cam.get(cv2.CAP_PROP_FPS))
print(cam.get(cv2.CAP_PROP_POS_FRAMES))
cv2.namedWindow('my Webcam')
cv2.setMouseCallback('my Webcam',mouseClick)
while(cam.isOpened()):
# while True:     #if true then the first arguement (ret) is true and the frame is captured
    ret,frame =cam.read()
    # out.write(frame)
    if evt ==  4:
        cv2.rectangle(frame,pnt1,pnt2,(255,0,255),Thickness)
        cv2.circle(frame,pnt1,Radius,Color,Thickness,cv2.LINE_AA)
        ROI =frame[pnt1[1]:pnt2[1],pnt1[0]:pnt2[0]]
        try:
            cv2.imshow('ROI',ROI)
            cv2.moveWindow('ROI',int(width*1.2),0)
        except:
            pass
    cv2.imshow('my Webcam',frame)
    cv2.moveWindow('my Webcam',0,0)
    if evt == 5:
        cv2.destroyWindow('ROI')
        evt = 0    
    
    cv2.imshow('my Webcam',frame)
    cv2.moveWindow('my Webcam',0,0)
    if cv2.waitKey(1) & 0xff ==ord('c'):
        break
cam.release()
# out.release()
cv2.destroyAllWindows()