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import numpy as np
import torch
import torch.backends.cudnn as cudnn
from PIL import Image
from nets.esrgan import Generator
from utils.utils import cvtColor, preprocess_input
class ESRGAN(object):
#-----------------------------------------#
# 注意修改model_path
#-----------------------------------------#
_defaults = {
#-----------------------------------------------#
# model_path指向logs文件夹下的权值文件
#-----------------------------------------------#
"model_path" : 'model_data/Generator_ESRGAN6.pth',
#-----------------------------------------------#
# 上采样的倍数，和训练时一样
#-----------------------------------------------#
"scale_factor" : 8,
#-------------------------------#
# 是否使用Cuda
# 没有GPU可以设置成False
#-------------------------------#
"cuda" : False,
}
#---------------------------------------------------#
# 初始化SRGAN
#---------------------------------------------------#
def __init__(self, **kwargs):
self.__dict__.update(self._defaults)
for name, value in kwargs.items():
setattr(self, name, value)
self.generate()
def generate(self):
self.net = Generator(self.scale_factor)
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
self.net.load_state_dict(torch.load(self.model_path, map_location=device))
self.net = self.net.eval()
print('{} model, and classes loaded.'.format(self.model_path))
if self.cuda:
self.net = torch.nn.DataParallel(self.net)
cudnn.benchmark = True
self.net = self.net.cuda()
def generate_1x1_image(self, image):
#---------------------------------------------------------#
# 在这里将图像转换成RGB图像，防止灰度图在预测时报错。
# 代码仅仅支持RGB图像的预测，所有其它类型的图像都会转化成RGB
#---------------------------------------------------------#
image = cvtColor(image)
#---------------------------------------------------------#
# 添加上batch_size维度，并进行归一化
#---------------------------------------------------------#
image_data = np.expand_dims(np.transpose(preprocess_input(np.array(image, dtype=np.float32), [0.5,0.5,0.5], [0.5,0.5,0.5]), [2,0,1]), 0)
with torch.no_grad():
image_data = torch.from_numpy(image_data).type(torch.FloatTensor)
if self.cuda:
image_data = image_data.cuda()
#---------------------------------------------------------#
# 将图像输入网络当中进行预测！
#---------------------------------------------------------#
hr_image = self.net(image_data)[0]
#---------------------------------------------------------#
# 将归一化的结果再转成rgb格式
#---------------------------------------------------------#
hr_image = (hr_image.cpu().data.numpy().transpose(1, 2, 0) * 0.5 + 0.5)
hr_image = (hr_image-np.min(hr_image))/(np.max(hr_image)-np.min(hr_image)) * 255
hr_image = Image.fromarray(np.uint8(hr_image))
return hr_image
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