trellixvulnteam / opencvfullproject_94vs

Open CV Full Project Study

Learn Open CV Using Python

To Learn Open CV with easy way

Table of contents

• Setup
• Required Library
• Read Image
• Read Video
• Read WebCam
• Require Basic Function
• Resize and Crop Image
• Draw Shape and Text

Setup

• Install Python ( Install below version of latest version )
• Install PyCham
• Create Project and add require library

How to install library

• Goto File > Settings > Project > Python Interpreter
• Press + Icon
• Search name of library
• Press Install Package button

Required Library

• opencv-python
• numpy

Read Image

The image will appear until you close the program

• File: readimage.py

import cv2
img = cv2.imread("res/face.jpg")
cv2.imshow("Output",img)
cv2.waitKey(0) 

Read Video

The video will appear until you close the program or press q

• File: readvideo.py

import cv2
cap = cv2.VideoCapture("res/road2.mp4")
while True:
    success, img = cap.read()
    if success:
        cv2.imshow("Video",img) 
        if cv2.waitKey(0) & 0xFF == ord('q'):
            break

Read WebCam

• File: readwebcam.py

import cv2
cap = cv2.VideoCapture(0)
cap.set(3,640) # Width
cap.set(4,480) # Height
cap.set(10,80) # increase the brightness level level between 0 to 100
while True:
    success, img = cap.read()
    if success:
        cv2.imshow("Video",img) # show image
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break

Require Basic Function

This function is need in OpenCV Developement.

• File: basicfunction.py

import cv2
import numpy as np

kernel = np.ones((5,5),np.uint8)
img = cv2.imread("res/face.jpg")

imgGray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
cv2.imshow("Gray Image", imgGray)

imgBlur = cv2.GaussianBlur(imgGray,(7,7),0)
cv2.imshow("Blur Image", imgBlur)

imgCanny = cv2.Canny(img,150,200)
cv2.imshow("Canny Image", imgCanny)

imgDialation = cv2.dilate(imgCanny,kernel,iterations=1)
cv2.imshow("Dialation Image",imgDialation)

imgEroded = cv2.erode(imgDialation,kernel,iterations=1)
cv2.imshow("Eroded Image",imgEroded)

cv2.waitKey(0)

Resize and Crop Image

• File: imageresizeorcrop.py

import cv2
import numpy as np

img = cv2.imread("res/face.jpg")
print(img.shape) # its return 3 Value first width , seocnd height, third Type of image Like RGB, GRAY

imgResize = cv2.resize(img,(300,400))
imgCroped = img[300:600,300:1000]

cv2.imshow("Image", img)
cv2.imshow("Resize Image", imgResize)
cv2.imshow("Croped Image", imgCroped)
cv2.waitKey(0)

Draw Shape and Text

• File: drawshapeandtext.py

import cv2
import numpy as np

imp = np.zeros((512,512,3),np.uint8)
print(imp.shape)

imp[:] = 255,255,255
# imp[200:300,100:300] = 0,255,0

cv2.line(imp,(0,0),(imp.shape[1],imp.shape[0]),(0,0,0),5)
cv2.rectangle(imp,(0,0),(250,350),(0,0,255),cv2.FILLED)
cv2.circle(imp,(400,200),100,(0,0,255),2)
cv2.putText(imp,"Hello World!",(000,400),cv2.FONT_HERSHEY_SIMPLEX,2,(255,0,0))

cv2.imshow("Show Image", imp)
cv2.waitKey(0)