python 实现将小图片放到另一个较大的白色或黑色背景图片中
将图片放入到白色或黑色背景图中，前提是图片小于背景图片的尺寸，原图为如下，长为192，宽为64。
1.将图片放入到白色背景图（224,224）中
import cv2
import numpy as np
def img_resize_to_target_white(image):
target = np.ones((224,224),dtype=np.uint8)*255
ret = cv2.cvtColor(target, cv2.COLOR_GRAY2BGR)
h = image.shape[0]
w = image.shape[1]
for i in range(224):
for j in range(224):
if(i < h) and (j < w):
ret[i, j, 0] = image[i, j, 0]
ret[i, j, 1] = image[i, j, 1]
ret[i, j, 2] = image[i, j, 2]
else:
ret[i, j, 0] = 255
ret[i, j, 1] = 255
ret[i, j, 2] = 255
return ret
if __name__ == '__main__':
image = cv2.imread('/home/yasin/桌面/test.png')
img_new_white = img_resize_to_target_white(image)
cv2.imshow("img_new_white", img_new_white)
cv2.waitKey()
运行结果为：
2.将图片放入到黑色背景图（224,224）中
import cv2
def img_resize_to_target_black(image):
target = np.zeros((224,224),dtype=np.uint8)
bgr_img = cv2.cvtColor(target, cv2.COLOR_GRAY2BGR)
h = image.shape[0]
w = image.shape[1]
for i in range(h):
for j in range(w):
bgr_img[i, j, 0] = image[i, j, 0]
bgr_img[i, j, 1] = image[i, j, 1]
bgr_img[i, j, 2] = image[i, j, 2]
return bgr_img
if __name__ == '__main__':
image = cv2.imread('/home/yasin/桌面/test.png')
img_new_black = img_resize_to_target_black(image)
cv2.imshow("img_new_black", img_new_black)
cv2.waitKey()
运行结果为：
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