簡單粗暴，不多說，直接程式碼吧：（這個程式碼實在上篇部落格的基礎上：人臉檢測——AFLW準備人臉）

先要生成AFLW_ann.txt。

import os
from PIL import Image
from PIL import ImageFile
ImageFile.LOAD_TRUNCATED_IMAGES = True
import cv2
import numpy as np


def crop_for_cal(sn, xn, yn, n):

    with open('AFLW_ann.txt','r') as f:
        lines = f.readlines()

    save_dir1 = 'data_prepare/cal_positive_'+str(n)+'_12'
    save_dir2 = 'data_prepare/cal_positive_'+str(n)+'_24'
    save_dir3 = 'data_prepare/cal_positive_'+str(n)+'_48'

    if os.path.exists(save_dir1)==False:
        os.makedirs(save_dir1)
    if os.path.exists(save_dir2)==False:
        os.makedirs(save_dir2)
    if os.path.exists(save_dir3)==False:
        os.makedirs(save_dir3)

    for idx, line in enumerate(lines):
        spl1 = line.strip().split(' ')
        image_path = spl1[0]
        x = int(spl1[1])
        y = int(spl1[2])
        w = int(spl1[3])
        h = int(spl1[4])

        x = int(x-xn*w/sn)
        y = int(y-yn*h/sn)
        w = int(w/sn)
        h = int(h/sn)

        # image = Image.open(image_path)

        
        image = cv2.imread(image_path)
        if image is None:
            continue
        if x<=0 and y<=0 and w<=0 and h<=0:
            continue
        box = (x, y, x+w, y+h)
    
        # patch = image.crop(box)
        patch = image[box[1]:box[3], box[0]:box[2], :]
        if patch is None:
            continue
        if patch.shape[0]<10 and patch.shape[1]<10:
            continue

        #patch1 = patch.resize((12, 12))
        #patch2 = patch.resize((24, 24))
        #patch3 = patch.resize((48, 48))
        patch1 = cv2.resize(patch, (12, 12))  
        patch2 = cv2.resize(patch, (24, 24))  
        patch3 = cv2.resize(patch, (48, 48))  
        

        spl2 = image_path.split('/')
        image_name = spl2[-1]

        save_path1 = save_dir1+'/'+str(idx)+image_name + '.jpg'
        save_path2 = save_dir2+'/'+str(idx)+image_name + '.jpg'
        save_path3 = save_dir3+'/'+str(idx)+image_name + '.jpg'

        #patch1.save(save_path1, 'jpeg')
        #patch2.save(save_path2, 'jpeg')
        #patch3.save(save_path3, 'jpeg')
        cv2.imwrite(save_path1, np.array(patch1))
        cv2.imwrite(save_path2, np.array(patch2))
        cv2.imwrite(save_path3, np.array(patch3))


if __name__ == '__main__':
    
    s_set = (0.83, 0.91, 1.0, 1.10, 1.21)
    x_set = (-0.17, 0, 0.17)
    y_set = (-0.17, 0, 0.17)
    n = 0
    for x in x_set:
        for y in y_set:
            for s in s_set:
                n = n + 1
                crop_for_cal(s, x, y, n)
 

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