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System and method for light falloff compensation in an optical system
| Details |
Inventors: Gallagher, Andrew C.; Gindele, Edward B.;
Assignee: Eastman Kodak Company (Rochester, NY)
Primary Examiner: Adams; Russell
Assistant Examiner: Kim; Peter B.
Attorney, Agent or Firm: Woods; David M.
An apparatus and method for compensating for light falloff in a film master frame of a photographic image. A masking unit is positioned between the master frame and copy material in an optical printer. The masking unit may be an LCD panel. A controller calculates a light falloff compensation function to produce a light falloff correction parameter that is used to control the transmittance values of a plurality of pixels in the masking unit. When a photographic copy is made, the masking function serves to counteract light falloff that existed in the master frame to produce a copy with reduced effect from light falloff. Control and selection of the light falloff compensation function can be based on a number of factors related to the camera type, lens type, film type, flash type, and other factors that created the light falloff on the master frame. In addition, one or more of the master frames from a roll of film may be scanned to generate data to drive the light falloff compensation function. The data may be averaged to improve performance of the system. |
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DETAILED DESCRIPTION The need in the art is addressed by the apparatus and methods of the present invention.
The illustrative embodiments include an apparatus for compensating for light falloff present in a photographic master frame at the time the master frame is printed in an optical photographic copier.
The apparatus includes a masking unit that has a plurality pixel elements, each controllable in light transmittance.
The controller is operable to adjust the transmittance of the plurality of pixel elements in accordance with a light falloff function.
In one embodiment, a control input for specifying one of a plurality of light falloff compensation functions defining a light falloff correction parameter for the master frame is provided.
The controller then operates in accordance with the light falloff function specified by the control input.
The illustrative embodiments also include a method of compensating for light falloff present in a photographic master frame at the time the master frame is printed to a copy in an optical photographic copier that has a masking unit having a plurality of individually controllable pixel elements, a controller, and a control input.
This is accomplished by receiving an input parameter by the control input, calculating a light falloff correction parameter by the controller based on said input parameter, generating an individual compensation value for at least one controllable pixel elements based on said correction parameter, and superimposing the compensation value onto the master unit so that the light falloff in the photographic copy is reduced.
These and other aspects, objects, features and advantages of the present invention will be more clearly understood and appreciated from a review of the following detailed description of the preferred embodiments and appended claims, and by reference to the accompanying drawings.
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