Finding red color in image using Python & OpenCV

Question

I am trying to extract red color from an image. I have code that applies threshold to leave only values from specified range:

img=cv2.imread(\'img.bmp\')
img         


        

Answer 1

Play with this.

#blurring and smoothin
img1=cv2.imread('marathon.png',1)

hsv = cv2.cvtColor(img1,cv2.COLOR_BGR2HSV)

#lower red
lower_red = np.array([0,50,50])
upper_red = np.array([10,255,255])


#upper red
lower_red2 = np.array([170,50,50])
upper_red2 = np.array([180,255,255])

mask = cv2.inRange(hsv, lower_red, upper_red)
res = cv2.bitwise_and(img1,img1, mask= mask)


mask2 = cv2.inRange(hsv, lower_red2, upper_red2)
res2 = cv2.bitwise_and(img1,img1, mask= mask2)

img3 = res+res2
img4 = cv2.add(res,res2)
img5 = cv2.addWeighted(res,0.5,res2,0.5,0)


kernel = np.ones((15,15),np.float32)/225
smoothed = cv2.filter2D(res,-1,kernel)
smoothed2 = cv2.filter2D(img3,-1,kernel)





cv2.imshow('Original',img1)
cv2.imshow('Averaging',smoothed)
cv2.imshow('mask',mask)
cv2.imshow('res',res)
cv2.imshow('mask2',mask2)
cv2.imshow('res2',res2)
cv2.imshow('res3',img3)
cv2.imshow('res4',img4)
cv2.imshow('res5',img5)
cv2.imshow('smooth2',smoothed2)




cv2.waitKey(0)
cv2.destroyAllWindows()