Learn how to embed a hidden watermark into digital images using advanced signal processing techniques in this 11-minute tutorial. Discover the mathematical principles behind invisible watermarking through practical demonstrations utilizing two-dimensional Fourier transforms. Explore how frequency domain manipulation allows you to conceal identifying information within image data while maintaining visual quality. Master the step-by-step process of watermark insertion and understand the underlying theory that makes this steganographic technique possible. Gain insights into digital image processing applications and see real examples of how mathematical transforms can be applied to solve practical problems in digital media protection and authentication.