Watermarking of images

摘要

Techniques and mechanisms described herein facilitate the watermarking of images. According to various embodiments, a watermark image to apply to a digital image is identified. The digital image may include a plurality of image pixel data values. Each of the image pixel data values may designate a color of a corresponding pixel in the digital image. The watermark image may include a plurality of watermark pixel data values. Each of the watermark pixel data values may designate a color change to a corresponding pixel. The watermark image may be of relatively low frequency and may exhibit relatively gradual transitions and relatively constant color tone. The watermark image may be superimposed on at least a portion of the digital image to create a watermarked digital image.

主权项

1. A method comprising:
identifying a watermark image to apply to a video frame, the video frame including a plurality of image pixel data values, each of the image pixel data values designating a color of a corresponding pixel in the video frame, the watermark image including a plurality of watermark pixel data values, each of the watermark pixel data values designating a color change to a corresponding pixel, the watermark image identifying a recipient of the video frame; transforming the video frame from the spatial domain into the frequency domain; superimposing the watermark image on at least a portion of the video frame in the frequency domain to create a watermarked video frame, the watermarked video frame including a plurality of watermarked image pixel data values corresponding to the image pixel data values altered by the color change designated in the corresponding watermark pixel data values; and transmitting the watermarked image to a plurality of video frame recipients, wherein watermarked images transmitted to different recipients include different watermarks; wherein the watermark image comprises an image gradient that represents a gradual, directional change in the color or intensity of the watermark.