Patent
Moving image coding method, especially in relation to hiding data in a multimedia image
Kim Ju Min,Yoo Jae Sin +1 more
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TLDR
In this paper, a moving image coding method is provided to extract hidden data when necessary after hiding the data in a multimedia moving image using a video CODEC, without increasing an amount of encoded data and a change of picture quality, consequently original data is unnecessary when extracting the hidden data.Abstract:
PURPOSE: A moving image coding method is provided to extract hidden data when necessary after hiding the data in a multimedia moving image using a video CODEC, without increasing an amount of encoded data and a change of picture quality, consequently original data is unnecessary when extracting the hidden data CONSTITUTION: A system extracts a motion vector through a motion compensation and a motion prediction with regards to an inputted image, performs a DCT process for a difference image, and sets initial quantization parameters The system carries out a data hiding process in the quantization parameters, and changes the parameters to recognize whether the data is hidden The system performs a quantization by using the changed parameters The system changes a level value of each block in DCT block units, and hides the dataread more
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Patent
Method and apparatus for estimating first qp value to encode video
TL;DR: In this article, an apparatus for predicting an initial QP(Quantization Parameter) value for image coding is presented. But the method is not suitable for image restoration, as it is computationally computationally expensive.
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