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HDMI 1.4
As it pertains to 3D Over HDMI. The 1.4 version of the specification will define common 3D formats and resolutions for HDMI-enabled devices. The specification will standardize the input/output portion of the home 3D system and will specify up to dual-stream 1080p resolution. This information is directly from hdmi.org.

Height error (also known as vertical error)
This is an error which is present within a stereogram, and it is caused when two prints or film chips are not vertically aligned in mounting, so that the images homologous points are at various heights.

HMD
Simply stands for ‘Head Mounted Display’.

Headset
A display device worn on the user’s head. This piece of equipment is worn on the user’s head. When used with a tracking device it can create an immersive virtual reality as all background noise is blocked out.

Holmes format
The Holmes format is a format for stereo cards that is based upon a stereoscope that was invented by Oliver Wendall Holmes. For most antique cards this format is used and it has centered images that are further apart than the human eye (3-1/2″ x 7″). This is very significant because all viewing devices for stereo cards need to have a light bending mechanism before it reaches the eyes. The majority of viewers are prismatic and later formats for cards were not as large.

Holmes stereoscope
This is the name for a common type of hand-held stereoscope which has an open skeletal frame. It is named after its American physician inventor Oliver Wendell Holmes in 1859. The stereoscope has an adjustable card holder and hood to shade the eyes; it is more correctly known as a Holmes-Bates stereoscope, after Joseph Bates introduced these changes.

Holography
Also known as ‘whole drawing’ is a technique used for producing a holographic image, (an image that conveys a sense of depth, but is not a stereogram in the usual sense of providing a fixed binocular parallax). The theory of a hologram was thought up by Dr. Dennis Gabor at the Imperial College of London in 1948, however holograms were not available until the ruby laser was later invented by T.A. Mainman of Hughes Aircraft in 1960 by. Holograms in modern times are made with lasers and they produce images that make people feel that they can reach out and touch. Some holographic images appear to float in the space at the front of the frame, and their perspective changes as you move in different directions. Holograms are monochromatic, and in order to view them no specialist viewing equipment is necessary, although correct lighting is very important. In order to make a successful hologram, lengthy exposures are required with illumination by laser beams that have to be carefully set up to travel along a path with beam splitters,  positioned mirrors, lenses, and specialist film.

Homologues (Homologous points)
These are identical features that are found in a stereo pairs left and right image points. The space between two homologous points is known as the separation of the two images and it can be used when determining the correct positioning of the images when mounting as a stereo pair.

Horizontal image translation
Is the horizontal moving of two image fields in order to change the value of the images parallax of corresponding points. Confusingly the term ‘convergence’ has been used to also describe this concept.

HUD
A display device that provides an image floating in mid-air in front of the user. HUD stands for ‘Head Up Display’, and it is simply a display device that provides an image floating in front of the user.

Hyperfocal distance
Hyperfocal distance can be described as the distance setting situated on the focusing scale of a lens mount that will help to produce a sharply focused image. It is of particular importance in stereo photography as it helps to ensure a maximum depth of field, to ensure that viewing is not confused by any out-of-focus subject matter.

Hyperstereo
This is the use of a long stereo base in order to create the effect of an enhanced stereo depth and a smaller scale of a scene. Hyperstereo creates an effect which is termed ‘Lilliputism’, due to the miniaturization of the subject which appears as a result. It is often used to help reveal depth discrimination in geological and architectural features.

Hypostereo
By using a baseline that is smaller than the distance between the left and right eyes when taking a picture exaggerates the size of the subject which helps to make them look much larger. As a result it produces an effect called ‘Giantism’. A good use of hypostereo would be when taking a 3D photograph, as the photographer could take a picture of a small object and make it look almost life size.

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