用python写一个ai换脸的程序
时间: 2023-09-25 16:08:28 浏览: 173
基于python的人脸识别程序
为了写一个AI换脸的程序,你需要使用Python中的一些深度学习框架,如Tensorflow或PyTorch。
下面是一个基本的AI换脸程序的流程:
1. 收集数据集:收集需要进行换脸的两个人的头像数据集。
2. 训练模型:使用深度学习框架训练一个生成对抗网络(GAN)模型,该模型可以将一个人的脸转换为另一个人的脸。你可以使用Pix2Pix或CycleGAN等已有的GAN模型,或者自己设计一个GAN模型。
3. 测试模型:使用测试集对模型进行测试,确保它可以成功地将一个人的脸转换为另一个人的脸。
4. 应用模型:将模型应用于实际的图像中,将一个人的脸转换为另一个人的脸。
下面是一个简单的例子,使用Tensorflow和Pix2Pix模型实现AI换脸:
1. 收集数据集:收集需要进行换脸的两个人的头像数据集。
2. 训练模型:
``` python
import tensorflow as tf
import tensorflow_datasets as tfds
from tensorflow_examples.models.pix2pix import pix2pix
import os
# 加载数据集
dataset, metadata = tfds.load('cycle_gan/monet2photo', with_info=True, as_supervised=True)
# 划分训练集和测试集
train_monet, train_photo = dataset['trainA'], dataset['trainB']
test_monet, test_photo = dataset['testA'], dataset['testB']
# 将图像归一化到[-1,1]
def normalize(input_image, input_mask):
input_image = tf.cast(input_image, tf.float32) / 127.5 - 1
input_mask -= 1
return input_image, input_mask
# 随机裁剪和调整大小
def random_jitter(input_image, input_mask):
input_image, input_mask = normalize(input_image, input_mask)
input_image = tf.image.resize(input_image, [286, 286], method=tf.image.ResizeMethod.NEAREST_NEIGHBOR)
input_mask = tf.image.resize(input_mask, [286, 286], method=tf.image.ResizeMethod.NEAREST_NEIGHBOR)
stacked_image = tf.stack([input_image, input_mask], axis=0)
cropped_image = tf.image.random_crop(stacked_image, size=[2, 256, 256, 3])
input_image, input_mask = cropped_image[0], cropped_image[1]
if tf.random.uniform(()) > 0.5:
input_image = tf.image.flip_left_right(input_image)
input_mask = tf.image.flip_left_right(input_mask)
return input_image, input_mask
# 批量读取数据
BUFFER_SIZE = 1000
BATCH_SIZE = 1
train_dataset = train_dataset.map(random_jitter).shuffle(BUFFER_SIZE).batch(BATCH_SIZE)
test_dataset = test_dataset.map(normalize).batch(BATCH_SIZE)
# 定义生成器和判别器
generator_g = pix2pix.unet_generator(3, norm_type='instancenorm')
generator_f = pix2pix.unet_generator(3, norm_type='instancenorm')
discriminator_x = pix2pix.discriminator(norm_type='instancenorm', target=False)
discriminator_y = pix2pix.discriminator(norm_type='instancenorm', target=False)
# 定义损失函数
loss_obj = tf.keras.losses.BinaryCrossentropy(from_logits=True)
def discriminator_loss(real, generated):
real_loss = loss_obj(tf.ones_like(real), real)
generated_loss = loss_obj(tf.zeros_like(generated), generated)
total_discriminator_loss = real_loss + generated_loss
return total_discriminator_loss * 0.5
def generator_loss(generated):
return loss_obj(tf.ones_like(generated), generated)
# 定义优化器
generator_g_optimizer = tf.keras.optimizers.Adam(2e-4, beta_1=0.5)
generator_f_optimizer = tf.keras.optimizers.Adam(2e-4, beta_1=0.5)
discriminator_x_optimizer = tf.keras.optimizers.Adam(2e-4, beta_1=0.5)
discriminator_y_optimizer = tf.keras.optimizers.Adam(2e-4, beta_1=0.5)
# 定义检查点
checkpoint_path = "./checkpoints/train"
ckpt = tf.train.Checkpoint(generator_g=generator_g,
generator_f=generator_f,
discriminator_x=discriminator_x,
discriminator_y=discriminator_y,
generator_g_optimizer=generator_g_optimizer,
generator_f_optimizer=generator_f_optimizer,
discriminator_x_optimizer=discriminator_x_optimizer,
discriminator_y_optimizer=discriminator_y_optimizer)
ckpt_manager = tf.train.CheckpointManager(ckpt, checkpoint_path, max_to_keep=5)
# 训练模型
@tf.function
def train_step(real_x, real_y):
with tf.GradientTape(persistent=True) as tape:
# 生成器G将X转换为Y'
fake_y = generator_g(real_x, training=True)
# 生成器F将Y'转换为X'
fake_x = generator_f(fake_y, training=True)
# 生成器F将X转换为Y''
cycled_y = generator_g(fake_x, training=True)
# 生成器G将Y转换为X''
cycled_x = generator_f(fake_y, training=True)
# 生成器G和生成器F的重建损失
id_x = generator_g(real_y, training=True)
id_y = generator_f(real_x, training=True)
# 判别器Dx的损失
disc_real_x = discriminator_x(real_x, training=True)
disc_fake_x = discriminator_x(fake_x, training=True)
# 判别器Dy的损失
disc_real_y = discriminator_y(real_y, training=True)
disc_fake_y = discriminator_y(fake_y, training=True)
# 总损失
gen_g_loss = generator_loss(disc_fake_y) + \
tf.reduce_mean(tf.abs(real_y - id_y)) * 10 + \
tf.reduce_mean(tf.abs(real_x - cycled_x)) * 10
gen_f_loss = generator_loss(disc_fake_x) + \
tf.reduce_mean(tf.abs(real_x - id_x)) * 10 + \
tf.reduce_mean(tf.abs(real_y - cycled_y)) * 10
total_gen_loss = gen_g_loss + gen_f_loss
disc_x_loss = discriminator_loss(disc_real_x, disc_fake_x)
disc_y_loss = discriminator_loss(disc_real_y, disc_fake_y)
# 计算梯度
generator_g_gradients = tape.gradient(gen_g_loss, generator_g.trainable_variables)
generator_f_gradients = tape.gradient(gen_f_loss, generator_f.trainable_variables)
discriminator_x_gradients = tape.gradient(disc_x_loss, discriminator_x.trainable_variables)
discriminator_y_gradients = tape.gradient(disc_y_loss, discriminator_y.trainable_variables)
# 优化器更新权重
generator_g_optimizer.apply_gradients(zip(generator_g_gradients, generator_g.trainable_variables))
generator_f_optimizer.apply_gradients(zip(generator_f_gradients, generator_f.trainable_variables))
discriminator_x_optimizer.apply_gradients(zip(discriminator_x_gradients, discriminator_x.trainable_variables))
discriminator_y_optimizer.apply_gradients(zip(discriminator_y_gradients, discriminator_y.trainable_variables))
return gen_g_loss, gen_f_loss, disc_x_loss, disc_y_loss
EPOCHS = 200
for epoch in range(EPOCHS):
for real_x, real_y in train_dataset:
gen_g_loss, gen_f_loss, disc_x_loss, disc_y_loss = train_step(real_x, real_y)
if epoch % 10 == 0:
ckpt_manager.save()
```
3. 测试模型:
``` python
import matplotlib.pyplot as plt
# 从测试集中加载图像
sample_monet, sample_photo = next(iter(test_dataset))
# 生成换脸图像
generated_photo = generator_g(sample_monet, training=True)
generated_monet = generator_f(sample_photo, training=True)
# 显示图像
fig, axes = plt.subplots(2, 2, figsize=(12, 12))
axes[0, 0].imshow(sample_monet[0])
axes[0, 1].imshow(generated_photo[0])
axes[1, 0].imshow(sample_photo[0])
axes[1, 1].imshow(generated_monet[0])
plt.show()
```
4. 应用模型:
``` python
import cv2
# 读取两个人的头像
img1 = cv2.imread('img1.jpg')
img2 = cv2.imread('img2.jpg')
# 将头像调整为256x256大小
img1 = cv2.resize(img1, (256, 256))
img2 = cv2.resize(img2, (256, 256))
# 将头像归一化到[-1,1]
img1 = (img1 / 127.5) - 1
img2 = (img2 / 127.5) - 1
# 将img1的脸转换为img2的脸
generated_img = generator_g(np.array([img1]), training=True)[0]
# 将生成的图像调整回原始大小
generated_img = ((generated_img + 1) * 127.5).astype(np.uint8)
generated_img = cv2.resize(generated_img, (img1.shape[1], img1.shape[0]))
# 显示生成的图像
cv2.imshow('Generated Image', generated_img)
cv2.waitKey()
cv2.destroyAllWindows()
```
这就是一个基本的AI换脸程序的实现过程。当然,这只是一个简单的例子,你可以根据自己的需要进行修改和扩展。
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