DL-Art-School/codes/data/lmdb_dataset_with_ref.py

import random
import numpy as np
import cv2
import torch
import torch.utils.data as data
import data.util as util
from PIL import Image, ImageOps
from io import BytesIO
import torchvision.transforms.functional as F
import lmdb
import pyarrow


# Reads full-quality images and pulls tiles from them. Also extracts LR renderings of the full image with cues as to
# where those tiles came from.
class LmdbDatasetWithRef(data.Dataset):

    def __init__(self, opt):
        super(LmdbDatasetWithRef, self).__init__()
        self.opt = opt
        self.db = lmdb.open(self.opt['lmdb_path'], subdir=True, readonly=True, lock=False, readahead=False, meminit=False)
        self.data_type = 'img'
        self.force_multiple = self.opt['force_multiple'] if 'force_multiple' in self.opt.keys() else 1
        with self.db.begin(write=False) as txn:
            self.keys = pyarrow.deserialize(txn.get(b'__keys__'))
            self.len = pyarrow.deserialize(txn.get(b'__len__'))\

    def motion_blur(self, image, size, angle):
        k = np.zeros((size, size), dtype=np.float32)
        k[(size - 1) // 2, :] = np.ones(size, dtype=np.float32)
        k = cv2.warpAffine(k, cv2.getRotationMatrix2D((size / 2 - 0.5, size / 2 - 0.5), angle, 1.0), (size, size))
        k = k * (1.0 / np.sum(k))
        return cv2.filter2D(image, -1, k)

    def resize_point(self, point, orig_dim, new_dim):
        oh, ow = orig_dim
        nh, nw = new_dim
        dh, dw = float(nh) / float(oh), float(nw) / float(ow)
        point[0] = int(dh * float(point[0]))
        point[1] = int(dw * float(point[1]))
        return point

    def augment_tile(self, img_GT, img_LQ, strength=1):
        scale = self.opt['scale']
        GT_size = self.opt['target_size']

        H, W, _ = img_GT.shape
        assert H >= GT_size and W >= GT_size

        LQ_size = GT_size // scale
        img_LQ = cv2.resize(img_LQ, (LQ_size, LQ_size), interpolation=cv2.INTER_LINEAR)
        img_GT = cv2.resize(img_GT, (GT_size, GT_size), interpolation=cv2.INTER_LINEAR)

        if self.opt['use_blurring']:
            # Pick randomly between gaussian, motion, or no blur.
            blur_det = random.randint(0, 100)
            blur_magnitude = 3 if 'blur_magnitude' not in self.opt.keys() else self.opt['blur_magnitude']
            blur_magnitude = max(1, int(blur_magnitude*strength))
            if blur_det < 40:
                blur_sig = int(random.randrange(0, int(blur_magnitude)))
                img_LQ = cv2.GaussianBlur(img_LQ, (blur_magnitude, blur_magnitude), blur_sig)
            elif blur_det < 70:
                img_LQ = self.motion_blur(img_LQ, random.randrange(1, int(blur_magnitude) * 3), random.randint(0, 360))

        return img_GT, img_LQ

    # Converts img_LQ to PIL and performs JPG compression corruptions and grayscale on the image, then returns it.
    def pil_augment(self, img_LQ, strength=1):
        img_LQ = (img_LQ * 255).astype(np.uint8)
        img_LQ = Image.fromarray(img_LQ)
        if self.opt['use_compression_artifacts'] and random.random() > .25:
            sub_lo = 90 * strength
            sub_hi = 30 * strength
            qf = random.randrange(100 - sub_lo, 100 - sub_hi)
            corruption_buffer = BytesIO()
            img_LQ.save(corruption_buffer, "JPEG", quality=qf, optimice=True)
            corruption_buffer.seek(0)
            img_LQ = Image.open(corruption_buffer)

        if 'grayscale' in self.opt.keys() and self.opt['grayscale']:
            img_LQ = ImageOps.grayscale(img_LQ).convert('RGB')

        return img_LQ

    def __getitem__(self, index):
        scale = self.opt['scale']

        # get the hq image and the ref image
        key = self.keys[index]
        ref_key = key[:key.index('_')]
        with self.db.begin(write=False) as txn:
            bytes_ref = txn.get(ref_key.encode())
            bytes_tile = txn.get(key.encode())
        unpacked_ref = pyarrow.deserialize(bytes_ref)
        unpacked_tile = pyarrow.deserialize(bytes_tile)
        gt_fullsize_ref = unpacked_ref[0]
        img_GT, gt_center = unpacked_tile

        # TODO: synthesize gt_mask.
        gt_mask = np.ones(img_GT.shape[:2])
        orig_gt_dim = gt_fullsize_ref.shape[:2]

        # Synthesize LQ by downsampling.
        if self.opt['phase'] == 'train':
            GT_size = self.opt['target_size']
            random_scale = random.choice(self.random_scale_list)
            if len(img_GT.shape) == 2:
                print("ERRAR:")
                print(img_GT.shape)
                print(full_path)
            H_s, W_s, _ = img_GT.shape

            def _mod(n, random_scale, scale, thres):
                rlt = int(n * random_scale)
                rlt = (rlt // scale) * scale
                return thres if rlt < thres else rlt

            H_s = _mod(H_s, random_scale, scale, GT_size)
            W_s = _mod(W_s, random_scale, scale, GT_size)
            img_GT = cv2.resize(img_GT, (W_s, H_s), interpolation=cv2.INTER_LINEAR)
            if img_GT.ndim == 2:
                img_GT = cv2.cvtColor(img_GT, cv2.COLOR_GRAY2BGR)

        H, W, _ = img_GT.shape

        # using matlab imresize
        img_LQ = util.imresize_np(img_GT, 1 / scale, True)
        lq_fullsize_ref = util.imresize_np(gt_fullsize_ref, 1 / scale, True)
        if img_LQ.ndim == 2:
            img_LQ = np.expand_dims(img_LQ, axis=2)
        lq_mask, lq_center = gt_mask, self.resize_point(gt_center.clone(), orig_gt_dim, lq_fullsize_ref.shape[:2])
        orig_lq_dim = lq_fullsize_ref.shape[:2]

        # Enforce force_resize constraints via clipping.
        h, w, _ = img_LQ.shape
        if h % self.force_multiple != 0 or w % self.force_multiple != 0:
            h, w = (h - h % self.force_multiple), (w - w % self.force_multiple)
            img_LQ = img_LQ[:h, :w, :]
            lq_fullsize_ref = lq_fullsize_ref[:h, :w, :]
            h *= scale
            w *= scale
            img_GT = img_GT[:h, :w]
            gt_fullsize_ref = gt_fullsize_ref[:h, :w, :]

        if self.opt['phase'] == 'train':
            img_GT, img_LQ = self.augment_tile(img_GT, img_LQ)
            gt_fullsize_ref, lq_fullsize_ref = self.augment_tile(gt_fullsize_ref, lq_fullsize_ref, strength=.2)

        # Scale masks.
        lq_mask = cv2.resize(lq_mask, (lq_fullsize_ref.shape[1], lq_fullsize_ref.shape[0]), interpolation=cv2.INTER_LINEAR)
        gt_mask = cv2.resize(gt_mask, (gt_fullsize_ref.shape[1], gt_fullsize_ref.shape[0]), interpolation=cv2.INTER_LINEAR)

        # Scale center coords
        lq_center = self.resize_point(lq_center, orig_lq_dim, lq_fullsize_ref.shape[:2])
        gt_center = self.resize_point(gt_center, orig_gt_dim, gt_fullsize_ref.shape[:2])

        # BGR to RGB, HWC to CHW, numpy to tensor
        if img_GT.shape[2] == 3:
            img_GT = cv2.cvtColor(img_GT, cv2.COLOR_BGR2RGB)
            img_LQ = cv2.cvtColor(img_LQ, cv2.COLOR_BGR2RGB)
            lq_fullsize_ref = cv2.cvtColor(lq_fullsize_ref, cv2.COLOR_BGR2RGB)
            gt_fullsize_ref = cv2.cvtColor(gt_fullsize_ref, cv2.COLOR_BGR2RGB)

        # LQ needs to go to a PIL image to perform the compression-artifact transformation.
        if self.opt['phase'] == 'train':
            img_LQ = self.pil_augment(img_LQ)
            lq_fullsize_ref = self.pil_augment(lq_fullsize_ref, strength=.2)

        img_GT = torch.from_numpy(np.ascontiguousarray(np.transpose(img_GT, (2, 0, 1)))).float()
        gt_fullsize_ref = torch.from_numpy(np.ascontiguousarray(np.transpose(gt_fullsize_ref, (2, 0, 1)))).float()
        img_LQ = F.to_tensor(img_LQ)
        lq_fullsize_ref = F.to_tensor(lq_fullsize_ref)
        lq_mask = torch.from_numpy(np.ascontiguousarray(lq_mask)).unsqueeze(dim=0)
        gt_mask = torch.from_numpy(np.ascontiguousarray(gt_mask)).unsqueeze(dim=0)

        if 'lq_noise' in self.opt.keys():
            lq_noise = torch.randn_like(img_LQ) * self.opt['lq_noise'] / 255
            img_LQ += lq_noise
            lq_fullsize_ref += lq_noise

        # Apply the masks to the full images.
        gt_fullsize_ref = torch.cat([gt_fullsize_ref, gt_mask], dim=0)
        lq_fullsize_ref = torch.cat([lq_fullsize_ref, lq_mask], dim=0)

        d = {'LQ': img_LQ, 'GT': img_GT, 'gt_fullsize_ref': gt_fullsize_ref, 'lq_fullsize_ref': lq_fullsize_ref,
             'lq_center': lq_center, 'gt_center': gt_center,
             'LQ_path': key, 'GT_path': key}
        return d

    def __len__(self):
        return self.len

if __name__ == '__main__':
    opt = {
        'name': 'amalgam',
        'lmdb_path': 'F:\\4k6k\\datasets\\ns_images\\imagesets\\imagesets-lmdb-ref',
        'use_flip': True,
        'use_compression_artifacts': True,
        'use_blurring': True,
        'use_rot': True,
        'lq_noise': 5,
        'target_size': 128,
        'min_tile_size': 256,
        'scale': 2,
        'phase': 'train'
    }
    '''
    opt = {
        'name': 'amalgam',
        'dataroot_GT': ['F:\\4k6k\\datasets\\ns_images\\imagesets\\imagesets-lmdb-ref'],
        'dataroot_GT_weights': [1],
        'force_multiple': 32,
        'scale': 2,
        'phase': 'test'
    }
    '''

    ds = LmdbDatasetWithRef(opt)
    import os
    os.makedirs("debug", exist_ok=True)
    for i in range(300, len(ds)):
        print(i)
        o = ds[i]
        for k, v in o.items():
            if 'path' not in k:
                #if 'full' in k:
                    #masked = v[:3, :, :] * v[3]
                    #torchvision.utils.save_image(masked.unsqueeze(0), "debug/%i_%s_masked.png" % (i, k))
                    #v = v[:3, :, :]
                import torchvision
                torchvision.utils.save_image(v.unsqueeze(0), "debug/%i_%s.png" % (i, k))