Question

Write a program that is capable of detecting the color brown in an image taken by a webcam using OpenCV python code.

Answer 1

# Python program for detection of a specific color ( brown here) using OpenCV with Python

import cv2

import numpy as np

# Webcamera no 0 is used to capture the frames

cap = cv2.VideoCapture(0)

# This drives the program into an infinite loop.

while(1):

# Captures the lives stream frame by frame

_, frame =cap.read()

# Converts image from BGR to HSV

hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)

lower_red = np.array([110,50,50])

upper_red = np.array([130,255,255])

#Here we are defining range of brown color in HSV

#This creates a mask of brown coloured

#objects found in the frame .

mask =cv2.inRange(hsv, lower_red, upper_red)

# The bitwise and of the frame and mask is done so

# that only the brown coloured objects are highlighted

# and stored in res

res = cv2.bitwise_and(frame,frame,mask=mask)

cv2.imshow('frame',frame)

cv2.imshow('mask',mask)

cv2.imshow('res',res)

# This displays the frame , mask

#and res which we created in 3 separate windows.

k = cv2.waitKey(5) & 0xFF

if k ==27:

break

# Destroys all of the HighGUI windows.

cv2.destroyALLWindows()

# release the captured frame

cap.release()