import numpy as np
import cv2
def paste_ROI_to_image(img1, img2, area):
image1 = img1.copy()
#改变尺寸
# y1, x1, y2, x2 = area
# img2 = cv2.resize(img2, (x2 - x1 + 1, y2 - y1 + 1)) # cv.resize(src, dsize=(width, height))
image1 = image1.astype(np.float) # 类型转换为np.float
img2 = img2.astype(np.float)
# alpha通道
# alpha_image1 = image1[y1:y2 + 1, x1:x2 + 1, 3] / 255.0 #特定区域
alpha_image1 = image1[:, :, 3] / 255.0 #整景影像
alpha_img2 = img2[:, :, 3] / 255.0
alpha = 1 - (1 - alpha_image1) * (1 - alpha_img2)
# BGR通道
for i in range(3):
# image1[y1:y2 + 1, x1:x2 + 1, i] = (image1[y1:y2 + 1, x1:x2 + 1, i] * alpha_image1 * (1 - alpha_img2) + img2[:, :, i] * alpha_img2) / alpha #放到特定位置
image1[:, :, i] = (image1[:, :, i] * alpha_image1 * (1 - alpha_img2) + img2[:, :, i] * alpha_img2) / alpha
image1[:,