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False stereo effects
These effects are caused in aquatic and snow scenes, it happens when one lens picks up a reflection which the other lens misses and this image is then fused with a different reflection picked up by the other lens. It can also be caused by subject movement between two separate, sequential exposures. For example; the drifting of clouds.

Far point
This is the feature in a stereo image that will appear to be the farthest distance from the viewer.

Field of view
The field of view is the angle with which a lens can accept light. It is usually measured in degrees. For example, 175° is the horizontal field of view for the human eye.

Field sequential
When talking about field sequential in the context of cinema-stereoscopy, it is defined as the rapid alternation of the right and left perspective views that are projected onto the screen.

Floating edges
Floating edges refers to the unnatural strips which appear down the window frame of a scene where monocular images float. This is caused when the stereo window is located behind a part or all of the subject matter. Trimming or masking the outside edge of the image will remove them by bringing the window forward to the correct position.

Floating windows
This term is simply the use of vertical bands (printed) to surround which supplants the physical screen surround. Invented by Nigel and Raymond Spottiswoode, this floating window results in a virtual window that floats in space to eliminate the edge of screen cue conflicts, as well as extending the parallax budget of the image being projected.

Fore window image
This is an image that appears directly in front of the window frame. It is where an image cuts through the edge of the window frame, this effect is referred to as ‘floating edges’.

When related to stereography, format usually refers to an image pair’s window-frame dimension, or the method of mounting the pair of images. With 35 mm transparencies, the format is often identified thanks to the number of film-edge perforations in the width dimension of each frame. Alternatively, it can be identified by the name of the camera most commonly associated with it; e.g., 4P (also ‘Nimslo’ or ‘half-frame’); 5P (also ‘Realist’ or ‘American’); 7P (also ‘Verascope’ or ‘European’); 8P (also ‘full-frame’). Print formats are usually identified by the type of mounting; e.g., ‘traditional’ (for side-by-side pairs) or ‘ViewMagic’ (for over-and-under pairs).

Frame buffer
This is memory that is dedicated to the systems graphics processor.  This is used to store rendered pixels before they are visually displayed through the monitor.

Frame compatible 3D format
This refers to the left and right frames being or organized so they fit into a single legacy frame such as 480 x 720, 720 x 1280 or 1080 x 1920 pixels. By using spatial compression, color encoding and time sequencing the images can be pixel decimated.

Frame identification notch
A frame identification notch is something that can be found on the top or side edge of the right frame on some traditional stereo cameras. This is used as a simple way of distinguishing the right frame from the left hand frame to facilitate mounting.

Frame Packing
Standard created for 3D HDTV broadcast. Left and right image packed into one video frame with twice the normal bandwidth. This is mandatory for HDMI 1.4 3D devices. Resolutions such as 720p50, 720p60, and 1080p24, have to be supported by display devices, and at least one of those by playback devices. Other resolutions and formats are optional. While HDMI 1.4 cables and devices will be capable of transmitting 3D pictures in full 1080p, HDMI 1.3 does not include such support. As a out-of-spec solution for the bitrate problem, a 3D image may be displayed at a lower resolution, like interlaced or at standard definition.

Frames per second
This is the rate/speed which the systems graphic processor can render new frames, of full screens of pixels. Games use this as a way to measure a GPU’s performance. The faster GPU’s will be able to render more frames per second, which helps make the application more fluid and responsive to the users input.

Is the term used to describe the adjustment of film chips or cameras in their mounts to include or exclude the desired parts of the scene, and to set up the stereo window.

Free viewing
Free viewing is most commonly known to describe the fusion of the adjacent left and right images into a stereo image without needing to use any form of viewing aid. When viewing something parallel, the eyesight is forced to change from normal convergence so that the left eye will look only at the left image, and so that the right eye will look at the intended right eyes image. When using cross-eyed viewing however, the left eye will look at the right eyes intended image, and the right eye at the lefts. An advantage of cross-eyed viewing is that once the technique has been learnt, much larger and widely separated images can be fused together, although this unfortunately has the disadvantage of producing an effect known as ‘lilliputism’.

Specifically refers to the amount of times in a second that a specific event will occur. Frequency is commonly measured in Hertz (Hz) which means ‘cycles per second’.

Frozen water effect
When in a stereograph the appearance of water, particularly fast moving water (such as a waterfall) when shot with a too fast shutter speed will become more noticeable because the image will not show the same sense of movement.

Frustum effect
Frustum effect is caused by front-to-back keystone distortion in the image space so that a cube that is parallel to the lens-base is portrayed as the frustum of a regular truncated pyramid, only with the smaller face towards the observer. In a reverse frustum distortion, the larger face will be at the front.

Full frame stereo format
This is a stereo format that uses stereo pairs of 8 perforations in every images width. This would be the same as a regular camera and is used on twin camera stereo photographs and with some specific RBT cameras. The Fed camera however can be modified to full frame.

Is the merging of the two different views of a stereo pair into one single 3D image.

Fusion, irregular
Like with accidental stereo effects and multiple diplopia, fusion irregular is the fusion (combining) of points that are not homologous.

Fusional reserves
These are a series of measures to probe exactly how much stress the divergence and convergence mechanisms can cope with when they are placed under a certain amount of stress. It is linked to a person having the ability to maintain a comfortable and clear single vision whilst still keeping control of their focusing mechanism. Results from this test are difficult to analyze, however if results are low it can be expected that concentrating for long periods of time will become difficult. Adults, but in particularly children tend to show a tendency to avoid close work when their fusional reserves are low.

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