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Diffstat (limited to 'opencv.html.markdown')
| -rw-r--r-- | opencv.html.markdown | 48 |
1 files changed, 47 insertions, 1 deletions
diff --git a/opencv.html.markdown b/opencv.html.markdown index 45046af6..4c52595e 100644 --- a/opencv.html.markdown +++ b/opencv.html.markdown @@ -86,13 +86,59 @@ cv2.ellipse(img,(256,256),(100,50),0,0,180,255,-1) # Adding Text On Images cv2.putText(img,"Hello World!!!", (x,y), cv2.FONT_HERSHEY_SIMPLEX, 2, 255) +# Blending Images +img1 = cv2.imread('cat.png') +img2 = cv2.imread('openCV.jpg') +dst = cv2.addWeighted(img1,0.5,img2,0.5,0) + +# Thresholding image +# Binary Thresholding +_,thresImg = cv2.threshold(img,127,255,cv2.THRESH_BINARY) +# Adaptive Thresholding +adapThres = cv2.adaptiveThreshold(img,255,cv2.ADAPTIVE_THRESH_GAUSSIAN_C, cv2.THRESH_BINARY,11,2) + +# Blur Image +# Gaussian Blur +blur = cv2.GaussianBlur(img,(5,5),0) +# Median Blur +medianBlur = cv2.medianBlur(img,5) + +# Canny Edge Detection +img = cv2.imread('cat.jpg',0) +edges = cv2.Canny(img,100,200) + +# Face Detection using Haar Cascades +# Download Haar Cascades from https://github.com/opencv/opencv/blob/master/data/haarcascades/ +import cv2 +import numpy as np +face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml') +eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml') + +img = cv2.imread('human.jpg') +gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) + +aces = face_cascade.detectMultiScale(gray, 1.3, 5) +for (x,y,w,h) in faces: + cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2) + roi_gray = gray[y:y+h, x:x+w] + roi_color = img[y:y+h, x:x+w] + eyes = eye_cascade.detectMultiScale(roi_gray) + for (ex,ey,ew,eh) in eyes: + cv2.rectangle(roi_color,(ex,ey),(ex+ew,ey+eh),(0,255,0),2) + +cv2.imshow('img',img) +cv2.waitKey(0) cv2.destroyAllWindows() -# destroyAllWindows() destroys all windows. If you wish to destroy specific window pass the exact name of window you created. +# destroyAllWindows() destroys all windows. +# If you wish to destroy specific window pass the exact name of window you created. ``` Further Reading: +Download Cascade from +<https://github.com/opencv/opencv/blob/master/data/haarcascades/> + OpenCV drawing Functions <https://docs.opencv.org/2.4/modules/core/doc/drawing_functions.html> |