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Add node to read watermarks #6630

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Add node to read watermarks #6630

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c70437d
add node to read watermarks
Jul 17, 2024
8bef132
tweak invocation name
Jul 17, 2024
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21 changes: 20 additions & 1 deletion invokeai/app/invocations/image.py
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@
WithBoard,
WithMetadata,
)
from invokeai.app.invocations.primitives import ImageOutput
from invokeai.app.invocations.primitives import ImageOutput, StringOutput
from invokeai.app.services.image_records.image_records_common import ImageCategory
from invokeai.app.services.shared.invocation_context import InvocationContext
from invokeai.backend.image_util.invisible_watermark import InvisibleWatermark
Expand Down Expand Up @@ -542,6 +542,25 @@ def invoke(self, context: InvocationContext) -> ImageOutput:
return ImageOutput.build(image_dto)


@invocation(
"retrieve_watermark",
title="Retrieve Invisible Watermark",
tags=["image", "watermark"],
category="image",
version="1.2.2",
)
class RetrieveWatermarkInvocation(BaseInvocation):
"""Read an invisible watermark from an image"""

image: ImageField = InputField(description="The image to read the watermark from")
watermark_len: int = InputField(default=8, description="length of watermark, in characters")

def invoke(self, context: InvocationContext) -> StringOutput:
image = context.images.get_pil(self.image.image_name)
watermark_text = InvisibleWatermark.read_watermark(image, self.watermark_len * 8)
return StringOutput(value=watermark_text)


@invocation(
"mask_edge",
title="Mask Edge",
Expand Down
9 changes: 8 additions & 1 deletion invokeai/backend/image_util/invisible_watermark.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@

import cv2
import numpy as np
from imwatermark import WatermarkEncoder
from imwatermark import WatermarkDecoder, WatermarkEncoder
from PIL import Image

import invokeai.backend.util.logging as logger
Expand All @@ -28,3 +28,10 @@ def add_watermark(cls, image: Image.Image, watermark_text: str) -> Image.Image:
encoder.set_watermark("bytes", watermark_text.encode("utf-8"))
bgr_encoded = encoder.encode(bgr, "dwtDct")
return Image.fromarray(cv2.cvtColor(bgr_encoded, cv2.COLOR_BGR2RGB)).convert("RGBA")

@classmethod
def read_watermark(cls, image: Image.Image, length: int = 64) -> str:
bgr = cv2.cvtColor(np.array(image.convert("RGB")), cv2.COLOR_RGB2BGR)
decoder = WatermarkDecoder("bytes", length)
watermark = decoder.decode(bgr, "dwtDct")
return watermark.decode("utf-8")