207 lines
6.1 KiB
Python
207 lines
6.1 KiB
Python
import torch
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import cv2
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import numpy as np
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from PIL import Image
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import io
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def invert_colors(image):
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"""Invert image colors (1.0 - image)."""
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return 1.0 - image
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def xor_operation(image, key):
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"""Apply XOR operation to image pixels with given key."""
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# Convert normalized [0,1] image to uint8 [0,255] for bitwise operations
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images_uint8 = (image * 255).to(torch.uint8)
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# Apply XOR operation for basic encryption/obfuscation
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processed_images = images_uint8 ^ key
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# Convert back to normalized float32 [0,1]
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return processed_images.to(torch.float32) / 255.0
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def encrypt_image(image, operation):
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"""Apply encryption/obfuscation operation to image."""
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if operation == "invert":
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processed_image = invert_colors(image)
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elif operation == "xor-16":
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processed_image = xor_operation(image, 16)
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elif operation == "xor-32":
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processed_image = xor_operation(image, 32)
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elif operation == "xor-64":
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processed_image = xor_operation(image, 64)
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elif operation == "xor-128":
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processed_image = xor_operation(image, 128)
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else:
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processed_image = image
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return processed_image
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def _single_image_to_bytes(image, format="image/png"):
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"""Convert single image (numpy array) to bytes."""
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# Convert to uint8
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if image.dtype != np.uint8:
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image = np.clip(image * 255, 0, 255).astype(np.uint8)
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# Convert to PIL image
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image_pil = Image.fromarray(image)
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# Save to memory as bytes
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buffer = io.BytesIO()
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image_pil.save(buffer, format=format.split("/")[-1])
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buffer.seek(0)
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return buffer.read()
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def image_to_bytes(image, format="image/png") -> bytes:
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"""Convert image (tensor or numpy) to bytes."""
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# Handle tensor input
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if isinstance(image, torch.Tensor):
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image = image.detach().cpu().numpy()
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# Remove batch dimension
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if image.ndim == 4:
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image = image[0]
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return _single_image_to_bytes(image, format)
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def bytes_to_image(image_bytes):
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"""Convert bytes to image tensor with alpha mask."""
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nparr = np.frombuffer(image_bytes, np.uint8)
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result = cv2.imdecode(nparr, cv2.IMREAD_UNCHANGED)
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channels = cv2.split(result)
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# Handle alpha channel if present
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if len(channels) > 3:
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mask = channels[3].astype(np.float32) / 255.0 # Normalize alpha to [0,1]
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mask = torch.from_numpy(mask)
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else:
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# Create solid white mask for images without alpha
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mask = torch.ones(channels[0].shape, dtype=torch.float32, device="cpu")
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result = _convert_color(result)
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result = result.astype(np.float32) / 255.0 # Normalize RGB to [0,1]
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new_images = torch.from_numpy(result)[None,] # Add batch dimension
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return new_images, mask
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def _convert_color(image):
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"""Convert BGR/BGRA image to RGB format."""
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# OpenCV loads images as BGR, convert to RGB for consistency
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if len(image.shape) > 2 and image.shape[2] >= 4:
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return cv2.cvtColor(image, cv2.COLOR_BGRA2RGB) # BGRA to RGB (drop alpha)
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return cv2.cvtColor(image, cv2.COLOR_BGR2RGB) # BGR to RGB
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def image_batch_to_bytes_list(images, format="image/png"):
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"""Convert batch of images to list of bytes."""
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if isinstance(images, torch.Tensor):
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images = images.detach().cpu().numpy()
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bytes_list = []
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# Handle batch dimension
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if images.ndim == 4:
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for i in range(images.shape[0]):
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image = images[i]
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image_bytes = _single_image_to_bytes(image, format)
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bytes_list.append(image_bytes)
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elif images.ndim == 3:
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# Single image
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image_bytes = _single_image_to_bytes(images, format)
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bytes_list.append(image_bytes)
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return bytes_list
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def bytes_list_to_image_batch(bytes_list):
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"""Convert list of bytes to batch of images with masks."""
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images = []
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masks = []
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for image_bytes in bytes_list:
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image, mask = bytes_to_image(image_bytes)
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images.append(image)
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masks.append(mask)
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# Concatenate all images into a batch
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if len(images) > 0:
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images_batch = torch.cat(images, dim=0)
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masks_batch = torch.stack(masks, dim=0)
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return images_batch, masks_batch
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else:
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# Return empty tensors if no images
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return torch.empty(0), torch.empty(0)
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def tensor_to_bytes(tensor):
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"""Convert raw tensor to bytes (serialized tensor data)."""
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# Handle tensor input
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if isinstance(tensor, torch.Tensor):
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tensor = tensor.detach().cpu()
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else:
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tensor = torch.from_numpy(tensor)
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# Remove batch dimension if present
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if tensor.ndim == 4 and tensor.shape[0] == 1:
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tensor = tensor[0]
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# Serialize tensor to bytes
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buffer = io.BytesIO()
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torch.save(tensor, buffer)
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buffer.seek(0)
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return buffer.read()
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def bytes_to_tensor(tensor_bytes):
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"""Convert bytes back to tensor (deserialize tensor data)."""
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buffer = io.BytesIO(tensor_bytes)
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# Load tensor
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tensor = torch.load(buffer)
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# Add batch dimension if not present
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if tensor.ndim == 3:
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tensor = tensor.unsqueeze(0)
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return tensor
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def tensor_batch_to_bytes_list(tensors):
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"""Convert batch of tensors to list of bytes."""
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if isinstance(tensors, torch.Tensor):
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tensors = tensors.detach().cpu()
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else:
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tensors = torch.from_numpy(tensors)
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bytes_list = []
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# Handle batch dimension
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if tensors.ndim == 4:
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for i in range(tensors.shape[0]):
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tensor = tensors[i]
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tensor_bytes = tensor_to_bytes(tensor)
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bytes_list.append(tensor_bytes)
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elif tensors.ndim == 3:
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# Single tensor
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tensor_bytes = tensor_to_bytes(tensors)
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bytes_list.append(tensor_bytes)
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return bytes_list
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def bytes_list_to_tensor_batch(bytes_list):
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"""Convert list of bytes to batch of tensors."""
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tensors = []
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for tensor_bytes in bytes_list:
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tensor = bytes_to_tensor(tensor_bytes)
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tensors.append(tensor)
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# Concatenate all tensors into a batch
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if len(tensors) > 0:
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tensors_batch = torch.cat(tensors, dim=0)
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return tensors_batch
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else:
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# Return empty tensor if no tensors
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return torch.empty(0) |