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Technology


SYNTHID

Identifying AI-generated content with SynthID


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We’re beta launching SynthID, a tool for watermarking and identifying
AI-generated content. With this tool, users can embed a digital watermark
directly into AI-generated images or audio they create. This watermark is
imperceptible to humans, but detectable for identification.

Being able to identify AI-generated content is critical to promoting trust in
information. While not a silver bullet for addressing the problem of
misinformation, SynthID is an early and promising technical solution to this
pressing AI safety issue.

This technology was developed by Google DeepMind and refined in partnership with
Google Research. SynthID could be further expanded for use across other AI
models and we plan to integrate it into more products in the near future,
empowering people and organizations to responsibly work with AI-generated
content.

 * How does SynthID work?
 * AI-generated music
 * AI-generated images


HOW DOES SYNTHID WORK?

SynthID uses two deep learning models — one for watermarking and another for
identifying:

 * Watermarking: SynthID uses an embedded watermarking technology that adds a
   digital watermark directly into AI-generated content. The combined model is
   optimized to improve imperceptibility by aligning the watermark to the
   original content.
 * Identification: SynthID can scan the image or audio for its digital watermark
   and help users assess whether the content, or part of it, was generated using
   our AI models.


SYNTHID FOR AI-GENERATED MUSIC

In November 2023, SynthID was expanded to watermark and identify AI-generated
music and audio. SynthID's first deployment will be through Lyria, our most
advanced AI music generation model to date. SynthID will watermark any content
published by our Lyria model.

SynthID’s watermark is embedded directly into the audio waveform of AI-generated
audio.

Watch

00:32


SynthID adds a digital watermark to AI-generated audio that is imperceptible to
the human ear.

First, SynthID converts the audio wave, a one dimensional representation of
sound into a spectrogram. A spectrogram is a two dimensional visualisation that
shows how the spectrum of frequencies in a sound evolves over time. Once the
spectrogram is computed, the digital watermark is added into it. Finally, the
spectrogram is converted back to the waveform. During this conversion step,
SynthID leverages audio properties to ensure that the watermark is inaudible to
the human ear so that it doesn’t compromise the listening experience.



SynthID converts audio into a visual spectrogram to add a digital watermark.

The watermark is robust to many common modifications such as noise additions,
MP3 compression, or speeding up and slowing down the track. SynthID can scan the
audio track to detect the presence of the watermark at different points to help
determine if parts of it may have been generated by Lyria.


SYNTHID FOR AI-GENERATED IMAGES

To help identify AI-generated images, SynthID is available to a limited number
of Vertex AI customers using the Imagen suite of our latest text-to-image models
that use input text to create photorealistic images.

Watch

00:48


SynthID adds a digital watermark directly into the pixels of AI-generated
images, making it imperceptible to the human eye.



SynthID generates an imperceptible digital watermark for AI-generated images.

We designed SynthID so it doesn’t compromise image quality, and allows the
watermark to remain detectable, even after modifications like adding filters,
changing colours, and saving with various lossy compression schemes — most
commonly used for JPEGs.



The watermark is detectable even after modifications like adding filters,
changing colours and brightness.

SynthID can scan the image for a digital watermark and provides three confidence
levels for interpreting the results for identification. If a digital watermark
is detected, part of the image is likely generated by Imagen.

Note: The model used to produce synthetic images and audio on this page may be
different from the model used on YouTube, Imagen and Vertex AI.



Watermarked image of a metallic butterfly with prismatic patterns on its wings



RELATED POSTS

 * Company
   
   Transforming the future of music creation
   
   Announcing our most advanced music generation model and two new AI
   experiments, designed to open a new playground for creativity
   
   16 November 2023

 * Research
   
   Identifying AI-generated images with SynthID
   
   New tool helps watermark and identify synthetic images created by Imagen
   
   29 August 2023


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