Embedding and extracting watermark in video data

A method for extracting a watermark in video data, applied to a computer device, the method comprising:

• converting format of an RGB watermarked image frame in watermarked video data to obtain a YCrCb watermarked image frame in a YCrCb format;
• converting image data of a Cb channel in the YCrCb watermarked image frame from an integer type to a floating-point type;
• acquiring a watermarked image frame comprising the image data of the Cb channel in the YCrCb watermarked image frame in the floating-point type;
• performing time-frequency transformation on the watermarked image frame to obtain watermarked frequency domain data, the watermarked frequency domain data comprising a matrix formed by frequency domain coefficients;
• and
• extracting watermark data according to the frequency domain coefficients in the watermarked frequency domain data.

A non-transitory computer-readable storage medium, the storage medium storing at least one instruction, at least one program, a code set or an instruction set, the at least one instruction, the at least one program, the code set, or the instruction set being loaded or executed by a processor to implement the method for extracting a watermark in video data, comprising:

• converting format of an RGB watermarked image frame in watermarked video data to obtain a YCrCb watermarked image frame in a YCrCb format;
• converting image data of a Cb channel in the YCrCb watermarked image frame from an integer type to a floating-point type;
• acquiring a watermarked image frame comprising the image data of the Cb channel in the YCrCb watermarked image frame in the floating-point type;
• performing time-frequency transformation on the watermarked image frame to obtain watermarked frequency domain data, the watermarked frequency domain data comprising a matrix formed by frequency domain coefficients;
• and
• extracting watermark data according to the frequency domain coefficients in the watermarked frequency domain data.