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92 lines
3.1 KiB
Python
92 lines
3.1 KiB
Python
import logging
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import math
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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import torch
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from torch import Tensor
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logger = logging.getLogger(__name__)
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def tile_process(
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img: "Tensor",
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scale: int,
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model: "torch.nn.Module",
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tile_size: int = 512,
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tile_pad: int = 50,
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) -> "Tensor":
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"""
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Process an image by tiling it, processing each tile, and then merging them back into one image.
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Args:
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img (Tensor): The input image tensor.
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scale (int): The scale factor for the image.
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tile_size (int): The size of each tile.
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tile_pad (int): The padding for each tile.
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model (torch.nn.Module): The model used for processing the tile.
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Returns:
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Tensor: The processed output image.
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"""
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import torch
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batch, channel, height, width = img.shape
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output_height = height * scale
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output_width = width * scale
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output_shape = (batch, channel, output_height, output_width)
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# Initialize the output tensor
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output = img.new_zeros(output_shape)
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tiles_x = math.ceil(width / tile_size)
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tiles_y = math.ceil(height / tile_size)
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logger.debug(f"Tiling with {tiles_x}x{tiles_y} ({tiles_x*tiles_y}) tiles")
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for y in range(tiles_y):
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for x in range(tiles_x):
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# Calculate the input tile coordinates with and without padding
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ofs_x, ofs_y = x * tile_size, y * tile_size
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input_start_x, input_end_x = ofs_x, min(ofs_x + tile_size, width)
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input_start_y, input_end_y = ofs_y, min(ofs_y + tile_size, height)
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padded_start_x, padded_end_x = (
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max(input_start_x - tile_pad, 0),
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min(input_end_x + tile_pad, width),
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)
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padded_start_y, padded_end_y = (
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max(input_start_y - tile_pad, 0),
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min(input_end_y + tile_pad, height),
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)
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# Extract the input tile
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input_tile = img[
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:, :, padded_start_y:padded_end_y, padded_start_x:padded_end_x
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]
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# Process the tile
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with torch.no_grad():
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output_tile = model(input_tile)
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# Calculate the output tile coordinates
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output_start_x, output_end_x = input_start_x * scale, input_end_x * scale
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output_start_y, output_end_y = input_start_y * scale, input_end_y * scale
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tile_output_start_x = (input_start_x - padded_start_x) * scale
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tile_output_end_x = (
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tile_output_start_x + (input_end_x - input_start_x) * scale
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)
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tile_output_start_y = (input_start_y - padded_start_y) * scale
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tile_output_end_y = (
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tile_output_start_y + (input_end_y - input_start_y) * scale
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)
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# Place the processed tile in the output image
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output[:, :, output_start_y:output_end_y, output_start_x:output_end_x] = (
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output_tile[
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:,
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:,
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tile_output_start_y:tile_output_end_y,
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tile_output_start_x:tile_output_end_x,
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]
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)
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return output
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