# 実験課題7
# 3.7 膨張・収縮

import cv2
import numpy as np

image_path = 'person.jpg'
img = cv2.imread(image_path)

if img is not None:
    hsv_img = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
    lower_skin = np.array([0, 20, 70])
    upper_skin = np.array([20, 255, 255])

    # 2値画像（白黒画像）を作成
    mask_img = cv2.inRange(hsv_img, lower_skin, upper_skin)

    kernel = np.ones((5, 5), np.uint8)

    # オープニング処理 (収縮 -> 膨張) [Erode to Dilate]
    eroded_first = cv2.erode(mask_img, kernel, iterations=3)
    seq_opening = cv2.dilate(eroded_first, kernel, iterations=3)
    cv2.imwrite('3_7_e2d.jpg', seq_opening)

    # クロージング処理 (膨張 -> 収縮) [Dilate to Erode]
    dilated_first = cv2.dilate(mask_img, kernel, iterations=3)
    seq_closing = cv2.erode(dilated_first, kernel, iterations=3)
    cv2.imwrite('3_7_d2e.jpg', seq_closing)