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 cv2import numpy as npdef 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 cv2def 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_imgif __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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