Turtle

Suborder Pleurodira. See articles Stereoscopy and 3-D film. Suborder Cryptodira. The first commercially available HD players are expected to debut at the 2006 NAB Show in Las Vegas in April. Suborder Paracryptodira (extinct)
. New HD DVD and HD Blu-ray disks will greatly improve the 3D effect, in color coded stereo programs. While the issue is far from resolved, most scientists now lean towards a Diapsid origin for turtles. Simple Red/Cyan plastic glasses provide the means to view the images discreetly to form a stereoscopic view of the content.

Re-analysis of prior phylogenies suggests that they classified turtles as anapsids both because they assumed this classification (most of them studying what sort of anapsid turtles are) and because they did not sample fossil and extant taxa were broadly enough for constructing the cladogram. This left and right layer technique is occasionally used for network broadcast, or recent "anaglyph" releases of 3D movies on DVD. All molecular studies have strongly upheld this new phylogeny, though some place turtles closer to Archosauria. Stereoscopic video requires either two channels — a right channel for the right eye and a left channel for the left eye or two overlayed color coded layers. More recent phylogenetic studies with this in mind placed turtles firmly within diapsids, slightly closer to Squamata than to Archosauria. in videoconferencing delivered on channels of fixed bandwidth, a constant bit rate (CBR) must be used. However, it was recently suggested that the Anapsid-like turtle skull may be due to convergent evolution rather than to anapsid descent. For real-time and non-buffered video streaming when the available bandwidth is fixed, e.g.

Most anapsids became extinct in the late Permian period, except procolophonoids and possibly the precursors of the testudines (turtles). On fast motion scenes, a variable bit rate uses more bits than it does on slow motion scenes of similar duration yet achieves a consistent visual quality. All Anapsid skulls lack a temporal opening, while all other extant amniotes have temporal openings (although in mammals the hole has become the zygoid arch). Variable bit rate (VBR) is a strategy to maximize the visual video quality and minimize the bit rate. It was believed that they are the only surviving branch of the ancient clade Anapsida, which includes groups such as procolophonoids, millerettids, protorothyrids and pareiasaurs. HDTV has a still higher quality, with a bit rate of 10 Mbit/s. Their exact ancestry is disputed. For example, VHS, with a bit rate of about 1 Mbit/s, is lower quality than DVD, with a bit rate of about 5 Mbit/s.

The first turtles are believed to have existed in the era of the dinosaurs, 200 million years ago. A higher bit rate allows better video quality. Turtles have a gelatinous substance in their upper and lower shell, called calipash and calipee respectively, the calipash being of a dull greenish and the calipee of a light yellow color. It is quantified using the bit per second (bit/s) unit or Megabits per second (Mbit/s). The turtles can take up dissolved oxygen from the water through these papillae, in much the same way that fish use gills. Bit rate is a measure of the rate of information content in a video stream. These projections, called "papillae", have a rich blood supply, and increase the surface area of the cloaca. The most common modern standards are MPEG-2, used for DVD and satellite television, and MPEG-4, used for home video.

Some species have large cloacal cavities lined with many finger-like projections. Likewise, temporal redundancy can be reduced by registering differences between frames; this task is known as interframe compression, including motion compensation and other techniques. However, aquatic respiration in Australian freshwater turtles is currently being studied. Broadly speaking, spatial redundancy is reduced by registering differences between parts of a single frame; this task is known as intraframe compression and is closely related to image compression. Although they spend large proportions of their lives underwater, turtles are air-breathing reptiles, and must surface at regular intervals to refill their lungs with fresh air. Video data contains spatial and temporal redundancy, making uncompressed video streams extremely inefficient. In some species, temperature of the egg during development determines whether an egg develops into a male or a female: a higher temperature causes a female, a lower temperature causes a male. A wide variety of methods are used to compress video streams.

Turtle eggs prepared to eat consist mainly of yolk. The expert then rates the impaired video using a scale ranging from "impairments are imperceptible" to "impairments are very annoying". Their albumen is white and will not coagulate when cooked because of the protein it contains which is different to that of bird eggs. In DSIS, each expert views an unimpaired reference video followed by an impaired version of the same video. The eggs of the largest species are spherical, while the eggs of the rest are elongated. One of the standardized method is the Double Stimulus Impairment Scale (DSIS). Sea turtles lay their eggs on dry sandy beaches. Many subjective video quality methods are described in the ITU-T recommendation BT.500.

The oldest tortoise on record is Tui Malila, known to have lived at least 188 years. The subjective video quality of a video processing system may be evaluated as follows:. Turtles generally live a long time; some individuals are known to have lived longer than 150 years. Video quality can be measured with formal metrics like PSNR or with subjective video quality using expert observation. The sizes of turtles vary from a few centimetres (forest and jungle species) to two metres (the leatherback turtle and the Galapagos tortoise). 4:4:4, 4:2:2, 4:2:0). Pond turtles (terrapins) are usually much smaller, while some land terrapins (tortoises) are as large as sea turtles. A common way to reduce the number of bits per pixel in digital video is by chroma subsampling (e.g.

Sea turtles grow to large sizes and live in the oceans in the temperate and tropical regions of Earth. The number of distinct colours that can be represented by a pixel depends on the number of bits per pixel (bpp). Reference the Rheodytes leukops species. It corresponds closely to the YUV scheme used in PAL television and the YDbDr scheme used by SÉCAM television. Some are known to be able to breathe through their rectums as well. YIQ is used in NTSC television. The top part of the shell is called the carapace, the bottom is called the plastron, and the two are connected by a bridge. Color model name describes the video color representation.

All turtles have a protective shell around their bodies. Pixels on computer monitors are usually square, but pixels used in digital video have non-square aspect ratios, such as those used in the PAL and NTSC variants of the CCIR 601 digital video standard, and the corresponding anamorphic widescreen formats. . The aspect ratio of a full 35 mm film frame with soundtrack (also known as "Academy standard") is around 1.37:1. Some species of turtles are highly endangered. High definition televisions use an aspect ratio of 16:9, or about 1.78:1. About 300 species are alive today. The screen aspect ratio of a traditional television screen is 4:3, or 1.33:1.

The order of Testudines includes both extant (living) and extinct species. Aspect ratio describes the dimensions of video screens and video picture elements. in North America) to refer to all members of the order, including tortoises, which are predominantly land-based. For example 512×512×512 voxels resolution, now used for simple 3D-video, can be displayed even on some PDAs. The term is sometimes used (esp. Video resolution for 3D-video is measured in voxels (volume picture element, representing a value in three dimensional space). The term turtle is usually used for the aquatic species, though aquatic fresh water turtles are also called terrapins. 1920 pixels per scan line by 1080 scan lines, progressive, at 60 frames per second.