TECHNOLOGY NEWS

Lossless data compression - from a compressed format, you can retrieve the original form of the same data. This property is related to the reduction of compression ratio, which makes reducing the size of the data is possible but very limited. The vast majority of algorithms for lossless algorithms are of general application, and their minor alterations, so that work better with certain types of data. Due to the very small reduction in the size of data transferred lossless compression is not suitable for use in today's IP video surveillance systems, as in the case of working with several cameras, would be immediately overpower the bandwidth. In addition, this type of algorithms that significantly increase the demand for memory disks, and thus compounded by the costs associated with archiving data. Lossy compression - algorithms to decrease the data size at the expense of losing some information, but maintaining the characteristics that interest us. Lossy compression reduces the demand for bandwidth and memory disks. Lossy compression algorithms commonly used in the transmission of multimedia data (pictures, audio / video). Compression of still images (photos) Compression of still images focuses on only one such image in the photo. Currently, IP networks, the most popular still image compression algorithm is the JPEG standard. JPEG compression - the most famous and promulgated still image compression algorithm, which was developed by the mid-80 th century. Any modern web browser allows you to decompress and display JPEG images. The advantage of this algorithm is able to use three different compression levels, so everyone can adjust the quality and size of the image to suit your requirements. Note, however, that the degree of compression is directly linked to the quality of the image obtained. The higher the compression ratio, the lower image quality. JPEG images are used in network ² video monitoring systems, in which it is possible notification (eg e-mail message with a picture of JPEG) with a detected alarm events.