Wireless network camera coding standard

At present, the main image compression coding standards for infrared network cameras are MPEG4-4, H.263, H.264, M-JPEG and so on.

MPEG4

The so-called MPEG standard refers to a series of standards on the compression and decompression technology of audio and video signals and multimedia signals, which are formulated by the moving picture expert group of ISO. Up to now, the following contents have been formulated, approved and implemented: MPEG 1 approved in1and MPEG-2 MPEG-4 and MP4 approved by MP3 1994 have passed 1999 authentication. The standards being formulated are: MPEG7 and MEPG2 1.

263

H.263 is a video coding and decoding proposal put forward by ITU-T for H.324 terminals. After continuous improvement and multiple upgrades, H.263 has matured, and now it has largely replaced H.26 1, and H.263 has become increasingly popular because it can transmit high-quality video streams in low bandwidth.

H.263 is a hybrid coding based on DPCM with motion compensation. In DPCM hybrid coding with motion compensation, motion compensation is carried out on the basis of motion search, and then DCT transform and zigzag scanning coding are carried out to obtain the output code stream. On the basis of H.26 1, H.263 adds the search of motion vectors to the search of half-pixel points; At the same time, four advanced options are added, such as infinite motion vector, arithmetic coding based on grammar, advanced prediction technology and PB frame coding. Thereby further reducing the code rate and improving the coding quality.

H.264 H.264 is a new digital video coding standard jointly formulated by VCEG of ITU-T and MPEG of ISO/IEC. It is not only H.264 of ITU-T, but also one tenth of MPEG4 of ISO/IEC.

Under the same reconstructed image quality, H.264 can save about 50% bit rate compared with H.263, and improve the performance by about 33% compared with the current video format based on MPEG4-4.

M-JPEG

M-JPEG technology is a compression technology of moving still images, which regards moving video sequences as continuous still images. This compression technology compresses each frame independently and completely, and can store each frame randomly in the editing process, which can be accurate to the frame for editing. However, M-JPEG only compresses the spatial redundancy within the frame, and does not compress the temporal redundancy between frames, so the compression efficiency is not high.

The key features of wireless network camera are: integrating camera module, network coding module and network card, plug and play; Support web browsing, you can browse pictures directly through IE browser; Powerful network client function, you can choose stand-alone client or distributed network video centralized monitoring management system for remote management according to your needs; Support dynamic IP, not limited by network environment; With SD flash card slot, you can insert an SD card (SanDisk) for local video recording; With alarm interface, it can manage the connection of alarm equipment.