#Visualstogramas
import numpy as np
import cv2
from matplotlib import pyplot as plt

cap = cv2.VideoCapture(0)

# Define the codec and create VideoWriter object
#ourcc = cv2.cv.CV_FOURCC(*'XVID')  # cv2.VideoWriter_fourcc() does not exist
#ut = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480))
kernel = np.ones((3,3),np.uint8)

while(cap.isOpened()):
    ret, frame = cap.read()
    if ret==True:
  	hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

	hist = cv2.calcHist([hsv],[0],None,[256],[0,256])

        cv2.imshow('Imagen Original',frame)
        cv2.imshow('Grises',hsv)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    else:
        break

# Release everything if job is finished
cap.release()
cv2.destroyAllWindows()
color = ('b','g','r')
for i,col in enumerate(color):
    histr = cv2.calcHist([frame],[i],None,[256],[0,256])
    plt.plot(histr,color = col)
    plt.xlim([0,256])
plt.show()