INTER FRAME WATERMARK IN A DIGITAL VIDEO

摘要

Watermark data is converted to watermark coefficients, which may be embedded in an image by converting the image to a frequency domain, embedding the watermark in image coefficients corresponding to medium-frequency components, and converting the modified coefficients to the spatial domain. The watermark data is extracted from the modified image by converting the modified image to a frequency domain, extracting the watermark coefficients from the image coefficients, and determining the watermark data from the watermark coefficients. The watermark data may be truncated image data bits such as truncated least significant data bits. After extraction from the watermark, the truncated image data bits may be combined with data bits representing the original image to increase the bit depth of the image. Watermark data may include audio data portions corresponding to a video frame, reference frames temporally proximate to a video frame, high-frequency content, sensor calibration information, or other image data.

主权项

1. A computer-implemented method for compressing video data, the method comprising:
accessing a first video frame and a second video frame temporally proximate to the first video frame, the first video frame comprising an array of pixels comprising image data of a reference frame; generating, by a processor, a watermark comprising a set of watermark coefficients representative of a low-resolution version of the second video frame; generating a transformed image frame by converting the array of pixels of the first video frame into a set of image coefficients in a frequency domain; embedding the watermark in the transformed image frame by modifying a subset of the image coefficients with the set of watermark coefficients to form a modified set of coefficients; generating a modified image frame by converting the modified set of coefficients into a spatial domain, the modified image frame representative of both the array of pixels and the generated watermark; compressing the modified image frame to produce a compressed first video frame; and storing the compressed first video frame.