의 목적

코드

컬러 이미지 직사각형 표시

from PIL import Image
import matplotlib.pyplot as plt
import numpy as np

def color_hist(filename):
    img = np.asarray(Image.open(filename).convert("RGB")).reshape(-1,3)
    plt.hist(img, color=["red", "green", "blue"], bins=128)
    plt.show()

color_hist("./test.jpg")

그레이스케일로 컬러 그림을 읽고 직사각형을 표시합니다

from PIL import Image
import matplotlib.pyplot as plt
import numpy as np

def color_hist(filename):
    img = np.asarray(Image.open(filename).convert("L")).reshape(-1,1)
    plt.hist(img, bins=128)
    plt.show()

color_hist("./test.jpg")

추기

from PIL import Image
import matplotlib.pyplot as plt
import numpy as np
import cv2

def color_hist(filename):
    img = np.asarray(Image.open(filename).convert("L")).reshape(-1,1)
    plt.hist(img, bins=256)
    plt.show()

def cut_image(filename):
    im = cv2.imread(filename,0)
    dst = im[0:400,250:410] #y,x
    cv2.imwrite('./tmp.jpg',dst)

cut_image("./test.jpg")
color_hist("./tmp.jpg")

CodingError 대책

참고 자료