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histogram.py
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histogram.py
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import numpy as np
import cv2
import matplotlib.pyplot as plt
def custom_hist(gray):
h, w = gray.shape
hist = np.zeros([256], dtype = np.int32)
for row in range(h):
for col in range(w):
pv = gray[row, col]
hist[pv] += 1
y_pos = np.arange(0, 256, 1, dtype = np.int32)
plt.bar(y_pos, hist, align = "center", color = "r", alpha = 0.5)
plt.xticks(y_pos, y_pos)
plt.ylabel("Freq")
plt.title("Histogram")
plt.show()
def image_hist(image):
cv2.imshow("input", image)
color = ("blue", "green", "red")
for i, color in enumerate(color):
hist = cv2.calcHist([image], [i], None, [256], [0, 256])
plt.plot(hist, color = color)
plt.xlim([0, 256])
plt.show()
image_path = r"C:\Users\emircan\Desktop\openCV/"
source = cv2.imread("wall-e.jpg")
gray = cv2.cvtColor(source, cv2.COLOR_BGR2GRAY)
custom_hist(gray)
image_hist(source)