Remote intelligent evidence obtaining system and method based on mobile internet
A mobile Internet and remote technology, applied in the field of electronic forensics, to achieve the effect of ensuring security and confidentiality, removing environmental noise, and a large amount of information
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Embodiment 1
[0025] like figure 1 A remote intelligent forensics system based on the mobile Internet, including: a forensics terminal, a transmission terminal and a cloud storage terminal; the forensics terminal is used for image and voice forensics, obtains forensics information, and transmits the forensics information to the transmission terminal; the transmission terminal , used to encrypt the evidence collection information, and send the encrypted evidence collection information to the cloud storage terminal; the cloud storage terminal is used to store the received encrypted evidence collection information; the evidence collection terminal includes: an image forensics unit , a voice forensics unit, a display and a processor; the processor is signal-connected to an image forensics unit, a display and a voice forensics unit respectively; the method for performing image forensics by the image forensics unit performs the following steps: obtaining continuous sequence pictures of the forensi...
Embodiment 2
[0028] On the basis of the previous embodiment, the voice forensics method performed by the voice forensics unit performs the following steps: obtain continuous voice information of the forensics target; calculate the array voice signal according to the output power spectrum and the average power spectrum of the voice signal acquired Maximum sub-band power ratio; according to preset judgment conditions, use the maximum sub-band power ratio and the current detection threshold to judge the state of the acquired voice signal, and perform power spectrum denoising on the voice signal; wherein, the output power spectrum The calculation formula is: Among them, k is the frequency point number; λ is the short time frame number; The power spectrum of the beam output signal of the current voice frame of the array when the frequency point number is b and the short-time frame number is λ; a x is the first regression coefficient; l 1 is the number of preset frequency points; among the...
Embodiment 3
[0031] On the basis of the previous embodiment, the transmission end includes: an information encoding unit, an information encryption unit, and an information transmission unit; the information encoding unit is used to encode evidence information; the information encryption unit is used to encode evidence The information is encrypted; the information transmission unit is used to send the encrypted evidence collection information to the cloud storage terminal; the method for encoding the evidence collection information by the information encoding unit performs the following steps: dividing the evidence collection information into several data blocks; Transforming the data block into a transform coefficient data block; converting the transform coefficient data block into a quantized coefficient data block; dividing the quantized coefficient data block into a predetermined number of sub-data blocks; classifying each sub-data block of the quantized coefficient into only a zero sub...
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