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load_dataset.py
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load_dataset.py
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import os
import sys
import numpy as np
import cv2
IMAGE_SIZE = 64
# 按照指定图像大小调整尺寸
def resize_image(image, height=IMAGE_SIZE, width=IMAGE_SIZE):
top, bottom, left, right = (0, 0, 0, 0)
# 获取图像尺寸
h, w, _ = image.shape
# 对于长宽不相等的图片,找到最长的一边
longest_edge = max(h, w)
# 计算短边需要增加多上像素宽度使其与长边等长
if h < longest_edge:
dh = longest_edge - h
top = dh // 2
bottom = dh - top
elif w < longest_edge:
dw = longest_edge - w
left = dw // 2
right = dw - left
else:
pass
# RGB颜色
BLACK = [0, 0, 0]
# 给图像增加边界,是图片长、宽等长,cv2.BORDER_CONSTANT指定边界颜色由value指定
constant = cv2.copyMakeBorder(image, top, bottom, left, right, cv2.BORDER_CONSTANT, value=BLACK)
# 调整图像大小并返回
return cv2.resize(constant, (height, width))
# 读取训练数据
images = []
labels = []
def read_path(path_name):
for dir_item in os.listdir(path_name):
# 从初始路径开始叠加,合并成可识别的操作路径
full_path = os.path.abspath(os.path.join(path_name, dir_item))
if os.path.isdir(full_path): # 如果是文件夹,继续递归调用
read_path(full_path)
else: # 文件
if dir_item.endswith('.jpg'):
image = cv2.imread(full_path)
image = resize_image(image, IMAGE_SIZE, IMAGE_SIZE)
# 放开这个代码,可以看到resize_image()函数的实际调用效果
# cv2.imwrite('1.jpg', image)
images.append(image)
labels.append(path_name)
return images, labels
# 从指定路径读取训练数据
def load_dataset(path_name):
images, labels = read_path(path_name)
# 将输入的所有图片转成四维数组,尺寸为(图片数量*IMAGE_SIZE*IMAGE_SIZE*3)
# 我和闺女两个人共1200张图片,IMAGE_SIZE为64,故对我来说尺寸为1200 * 64 * 64 * 3
# 图片为64 * 64像素,一个像素3个颜色值(RGB)
images = np.array(images)
print(images.shape)
# 标注数据,'liziqiang'文件夹下都是我的脸部图像,全部指定为0,另外一个文件夹下是同学的,全部指定为1
labels = np.array([0 if label.endswith('liziqiang') else 1 for label in labels])
return images, labels
if __name__ == '__main__':
if len(sys.argv) != 1:
print("Usage:%s path_name\r\n" % (sys.argv[0]))
else:
images, labels = load_dataset("//home//ylhy//venv//sm")