What Is Video Forensics
Video forensics has become a hot research issue in signal processing. It can be used to reconstruct chains and images. Technological evolution has made it difficult to validate multimedia content in the modern world because data can easily be subjected to alterations. To avoid and eliminate this problem, video experts have proposed the use of video forensics technology, to help to construct the processing history of the multimedia signal. It is a known fact that nonreversible operations applied on a signal leave traces which can be used to reconstruct the alterations operated on the original video. It also helps to identify the source that generated the image.
Video forensics is used to authenticate any given media content. There are state-of-art-equipment and technologies, which can be used to alter images several times and so, it makes it difficult for such digital content to be used to support legal evidence. Video forensics help to restore information that is maliciously damaged or hidden to conceal certain facts. Also, it helps to trace the actual source of the multimedia material and validate the origin of the data.
The marks and the footprints left when multimedia data is altered allow experts to reconstruct the original content; it is referred to as reverse engineering of the digital data, which helps to identify the order of the processing steps the digital content has undergone.
Importance and Uses of Video Forensics
Video forensics can be used to detect re-projected videos- fake copies of videos can be produced using camcorders in cinemas. It becomes difficult for the public to different between original and fake copies.
It provides video retrieval techniques- this is critical in dealing with re-acquisition problem. Video forensics helps to extract salient features from the visual content.
Detect videos, which have been tempered with- videos can be tempered with in several ways; one may remove or replace frames or just eliminate the object from the scene. Forensic techniques could be used to determine the relationship between adjacent frames and confirm if some of them have been removed or not.
Recover details – forensic enhancement may be used to retrieve details that are not clear when viewing the unprocessed footage. There are two types of digital video recorders: PC- based and embedded standalone model. They record the videos to hard drives. Once the video has been collected, it should be retrieved to produce quality images. It is during the retrieval process that the footage could be altered. Thus, the job of a forensic expert is to determine the authenticity of the images before they can be used as evidence in a court of law.
In conclusion, it is worth noting that creating a forged video nowadays is easier than it was a few decades ago. There are video editing suites which make it simpler to adjust videos. They make it difficult to use surveillance video footage in courts because suspects can claim that the videos are forged. Luckily, video forensic experts can verify the authenticity of the videos, and thus, they can be used as evidence in a court of law. Visit http://www.qognify.com/ to learn more about video forensics.