The Importance Of Gravity In Light Field Photography
2.4Exposure
One of the most important factors in photo’s quality might be brightness. Usually, photo’s brightness is controlled bytwo setting parameters, exposure time and aperture size, in a camera and an additional parameter, ISO, for a digital camera. Exposure time means the amount of time duration for which a film/sensor is exposed. You can imagine that longer exposure time would make your photo brighter than shorter exposure time and vice versa. Also, it’s straightforward to expect the effect in linear relation. For example, two times longer exposure time would make a photo two times brighter. Usually, exposure time is set in fraction of a second such as 1/30, 1/60, 1/125, 1/250 and etc. Long exposure time is good to achieve a bright photo but may cause a side effect, motion blur. Motion blur is blur effect created in a photo due to the movement of a subject or a camera while exposing. The left photo in Figure 2.10 shows motion blur effect by the subject’s movement .Freezing motion effect as shown in Figure 2.11 can be achieved with appropriate exposure time according to subjects’ speed.
Light Field Photography
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A single ray can be described as Figure 3.1 with five parameters for a general 3D space movement (left) and with four parameters for a specific movement between two planes(right), which models the case of photo shooting. The four light field parameters in photo shooting case can be expressed as four spatial parameters, (u, v, t, s), or two spatial and two angular parameters, (θ, Φ, t, x). Now, you are ready to understand the conversion between light field and a captured photo.Figure 3.2 top image shows how 2D light field, the simplified version of real 4D light field, is converted to a photo in conventional photography,where 2-dimensional ray information, (x, θ) is recorded as one dimensional information, u. You may note thatthe three rays coming from the subject are equally recorded as
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