M-JPEG technology is motion still image compression technology. It processes moving video sequences as continuous still images. This compression technique compresses each frame individually and completely. Each frame can be stored randomly in the editing process. Perform frame-accurate editing. However, M-JPEG only compresses the spatial redundancy in the frame and does not compress the time redundancy between the frames. Therefore, the compression efficiency is not high.
Second, MPEG-4
The so-called MPEG-4 standard refers to a set of standards developed by ISO's Moving Picture Experts Group on compression and decompression technologies for audio and video signals and multimedia signals. The MPEG-4 compression factor is 450 times (up to 800 times for still images), and it is the latest MPEG standard for mobile communication devices such as mobile phones that transmit audio/video signals on the Internet in real time. The biggest difference between MPEG-4 and MPEG versions in the past is that MPEG-4 uses a "layer" method that intelligently selects the differences in the images and edits the images individually under compression to make the image files. The capacity is greatly reduced, and the transmission of audio/video is accelerated.
Third, H.264
H.264 is a new digital video coding standard developed by ITU-T's VCEG and ISO/IEC MPEG Joint Video Group. It is both ITU-T H.264 and ISO/IEC MPEG-4. Ten parts. With the same reconstructed image quality, H.264 can save about 50% code rate compared with H.263, which is about 33% more performance than the current video format implemented according to MPEG-4.
Flat Field Holographic Concave Grating
The Concave Grating has the advantage of being able to constitute a spectroscopic system without any assistance from concave mirrors or similar types of image-forming elements. For this reason,the Concave Grating is used in a wide range of applications, such as analytical instruments,optical communications,biotechnology,and medical instruments. Spectroscopes incorporating concave gratings are classified roughly into two groups: polychromators or monochromators.
China star optics can provide customers with a variety of replicated grating products such as diffraction gratings, reflective gratings,holographic gratings,concave gratings etc. to meet different needs. Maximum ruled area is up to 300x300mm2 for plane ruled diffraction gratings. For replicated diffraction and transmission gratings the ruling density can be from 20 grooves per millimeter to 2400 grooves per millimeter, wavelength from 0.2 micron to 25 microns.
Please contact us for Customing Sizes and types of gratings.
Holographic gratings:
Specifications:
Ruled area: <=70 * 70mm
Wavelength range: 0.2-0.8um
Grooves per mm: 1,200 to 3,600L/mm
Diffraction: >70%
Ruled gratings:
Specifications:
Ruled area: <=70 * 70mm
Wavelength range: 0.2-15um
Grooves per mm: 50 to 2,400L/mm
Diffraction: >70%
Concave gratings:
Specifications:
Ruled area: <=70 * 70mm
Wavelength range: 200 to 900um
Grooves per mm: 490 to 1,200L/mm
Diffraction: >70%
Flat Field Holographic Concave Grating,Flat Field Concave Grating,Spherical Holographic Grating,Aberration Corrected Holographic Grating
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