Moving picture experts group audio layer-3 (MP3) audio double-compression detection method under same code rate

Abstract

The invention discloses a moving picture experts group audio layer-3 (MP3) audio double-compression detection method under same code rate. The MP3 audio double-compression detection method under the same code rate comprises the following steps of firstly acquiring to-be-detected MP3 audios, then, decoding the to-be-detected MP3 audios to obtain decoded WAV audios, then, coding the decoded WAV audios, respectively and correspondingly acquiring scale factor matrixes in a decoding process and a coding process according to the position of every long-window coded frame during the decoding process and the coding processes, extracting a characteristic value in every to-be-detected MP3 audio according to the scale factor matrixes respectively acquired in the decoding process and the coding process, and sending the characteristic values into a trained support vector machine and detecting the characteristic values to determine whether the to-be-detected MP3 audios are MP3 audios after primary compression or MP3 audios after double compression under the same code rate. The MP3 audio double-compression detection method under the same code rate has the advantages that the blank of MP3 audio double-compression detection under the same code rate is filled and the defect of the audio double-compression detection under higher code rate is overcome, and two scale factor matrixes are introduced, so that the computation complexity is lowered.

Description

technical field [0001] The invention relates to an audio double compression technology for multimedia digital forensics, in particular to an MP3 audio double compression detection method under the same code rate. Background technique [0002] With the rapid development of multimedia information technology, people are increasingly using audio equipment, image equipment, video equipment and other recording equipment to obtain various multimedia information in the world, and these multimedia information also closely affect people's lives. . In this digital age, with the emergence of multimedia editing software such as Coo1EditPro and GoldWave, many non-professionals can edit and modify multimedia information only through multimedia editing software without leaving obvious traces of tampering. Although most people edit and modify multimedia information just to make the multimedia information more perfect, thereby enhancing the visual or auditory effect of the multimedia informa...

AI Technical Summary

Problems solved by technology

At present, many scholars have done a lot of research on the dual compression detection of images and videos, but there are few dual compression detections on MP3 audio, especially the dual compression detection under the same bit rate of MP3.

[0004] According to Shi Yunqing and others, the number of MDCT coefficient values ​​between -1 and 1 in the second compression process is less than the number of MDCT coefficient values ​​​​in the first compression process between -1 and 1, using Benford Law and frame offset to detect whether the MP3 audio has been double-compressed. This method has a better detection effect on the double-compression MP3 audio with the first compression code rate of RB1 and the second compression code rate of RB2 (RB2>RB1). However, the first compression code rate is RB1, and the second compression code rate is RB2 (RB2

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