condition/lineart.py

from controlnet_aux import LineartDetector
import torch
import cv2
import numpy as np
import torch.nn as nn


norm_layer = nn.InstanceNorm2d
class ResidualBlock(nn.Module):
    def __init__(self, in_features):
        super(ResidualBlock, self).__init__()

        conv_block = [  nn.ReflectionPad2d(1),
                        nn.Conv2d(in_features, in_features, 3),
                        norm_layer(in_features),
                        nn.ReLU(inplace=True),
                        nn.ReflectionPad2d(1),
                        nn.Conv2d(in_features, in_features, 3),
                        norm_layer(in_features)
                        ]

        self.conv_block = nn.Sequential(*conv_block)

    def forward(self, x):
        return x + self.conv_block(x)
class LineArt(nn.Module):
    def __init__(self, input_nc=3, output_nc=1, n_residual_blocks=3, sigmoid=True):
        super(LineArt, self).__init__()

        # Initial convolution block
        model0 = [   nn.ReflectionPad2d(3),
                    nn.Conv2d(input_nc, 64, 7),
                    norm_layer(64),
                    nn.ReLU(inplace=True) ]
        self.model0 = nn.Sequential(*model0)

        # Downsampling
        model1 = []
        in_features = 64
        out_features = in_features*2
        for _ in range(2):
            model1 += [  nn.Conv2d(in_features, out_features, 3, stride=2, padding=1),
                        norm_layer(out_features),
                        nn.ReLU(inplace=True) ]
            in_features = out_features
            out_features = in_features*2
        self.model1 = nn.Sequential(*model1)

        model2 = []
        # Residual blocks
        for _ in range(n_residual_blocks):
            model2 += [ResidualBlock(in_features)]
        self.model2 = nn.Sequential(*model2)

        # Upsampling
        model3 = []
        out_features = in_features//2
        for _ in range(2):
            model3 += [  nn.ConvTranspose2d(in_features, out_features, 3, stride=2, padding=1, output_padding=1),
                        norm_layer(out_features),
                        nn.ReLU(inplace=True) ]
            in_features = out_features
            out_features = in_features//2
        self.model3 = nn.Sequential(*model3)

        # Output layer
        model4 = [  nn.ReflectionPad2d(3),
                        nn.Conv2d(64, output_nc, 7)]
        if sigmoid:
            model4 += [nn.Sigmoid()]

        self.model4 = nn.Sequential(*model4)

    def forward(self, x, cond=None):
        """
        input: tensor (B,C,H,W)
        output: tensor (B,1,H,W) 0~1
        """

        out = self.model0(x)
        out = self.model1(out)
        out = self.model2(out)
        out = self.model3(out)
        out = self.model4(out)

        return out
    
    
if __name__ == '__main__':
    import matplotlib.pyplot as plt
    from tqdm import tqdm
    apply_lineart = LineArt()
    apply_lineart.load_state_dict(torch.load('condition/ckpts/model.pth', map_location=torch.device('cpu')))
    img = cv2.imread('condition/car_448_768.jpg')
    img = torch.from_numpy(img).permute(2,0,1).unsqueeze(0).repeat(8,1,1,1).float()
    detected_map = apply_lineart(img)
    print(img.shape, img.max(),img.min(),detected_map.shape, detected_map.max(),detected_map.min())
    cv2.imwrite('condition/example_lineart.jpg', 255*detected_map[0,0].cpu().detach().numpy())