结合图像轮廓和另一幅图​​像

Question

假设我有此图像作为numpy数组。 所有白色像素均为1，黑色为零。 我也有这个图像作为numpy数组。 我想从没有白色背景的第一张图片中提取snqke，然后使用python将其粘贴到森林图片上。 这里有人知道怎么做吗？

Answer 1

我认为使蛇变红会更具有启发性和乐趣，因为您拥有的东西一定可以随心所欲地四处闲逛。

#!/usr/bin/env python3

from PIL import Image
import numpy as np

snake  = Image.open('snake.jpg').convert('L')
forest = Image.open('forest.jpg').convert('RGB')

# Make sensible sizes
snakedims = (100,150)
snake  = snake.resize(snakedims)
forest = forest.resize((600,800))

# Make into numpy arrays
snakenp  = np.array(snake)
forestnp = np.array(forest)

# Top-left corner of where we want snake to appear
topleft = 300,500

# Create an ROI - Region of Interest - same size as snake
roi = forestnp[topleft[1]:topleft[1]+snakedims[1], topleft[0]:topleft[0]+snakedims[0], :]

# Everywhere in the ROI where the snake is less than 128, put red (255,0,0)
roi[snakenp<128] = 255,0,0

# Save result to disk
Image.fromarray(forestnp).save('result.png')