利用PIL进行不失真的resize

进行不会变形的resize

代码

import os
from PIL import Image
import math


def resize_pad(image,target_size):
    w,h = image.size
    minx = min(w,h)
    if minx == h:
        # w可以缩放到224
        # h进行padding
        new_h = int(h * (target_size/w))
        image = image.resize((target_size,new_h),Image.Resampling.BICUBIC)
        # 生成一张targe_size大小的图
        aimage = Image.new('RGB',(target_size,target_size),(127,127,127))
        # 计算上面需要贴的大小
        psize_up = (target_size - new_h)//2
        # 将缩放后的图像贴上去
        aimage.paste(image,(0,psize_up))
        aimage.show()
    else:
        # minx==w
        # h可以缩放到224
        # w进行padding
        new_w = int(w * (target_size/h))
        image = image.resize((new_w,target_size),Image.Resampling.BICUBIC)
        # 生成一张targe_size大小的图
        aimage = Image.new('RGB',(target_size,target_size),(127,127,127))
        # 计算左边需要贴的大小
        psize_left = (target_size - new_w)//2
        # 将缩放后的图像贴上去
        aimage.paste(image,(psize_left,0))
        aimage.show()


if __name__ == '__main__':
    image_path = "E:/my_datasets/keypoint_2d/hand_keypoint/hand_keypoint/val/JPEGImages/1577.png"
    image = Image.open(image_path).convert('RGB')
    ori = image.resize((224,224))
    ori.show()
    resize_pad(image,target_size=224)