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US 8,740,074 B2Granted
Imaging apparatus for reading information
AssigneeFujitsu Frontech Limited
InventorsKozo Yamazaki, Isao Iwaguchi
Life of this patent
Estimating the term…
Abstract
A liquid crystal panel includes an iris unit for limiting the incident range of light from an object to be shot, and a filter unit for assigning a exposure energy distribution varying with the position to incident light whose incident range is limited by the iris unit. The control unit controls the ON time and the OFF time of each pixel of the liquid crystal panel, and then a low pass filter operation on the captured image as an image processing can be optically replaced.
Claims7
An imaging apparatus for reading information, comprising:
- an image sensor obtaining an image of an object;
- a lens system including a single lens or a plurality of lenses, the lens system receiving light from an object and guiding the light to the image sensor while focusing;
- an iris limiting an incident range of light from each of points on the object;
- a transmissive spatial light modulator arranged at an opening of the iris provided in the iris and assigning a transmittance characteristic varying with a position to each of incident light whose incident range is limited by the iris;
- and
- a control unit controlling the transmittance characteristic of the transmissive spatial light modulator;
- wherein
- by adjusting a distance between the lens system and the image sensor so that a focus position of the lens system can be set in front of or behind a light-receptive surface of the image sensor, each of the incident light spreads within a predetermined range on the light-receptive surface, and by assigning the transmittance characteristic varying with a position to each of the incident light by the transmissive spatial light modulator, identical intensity distributions of each of the incident light overlap one another, and as a result a desirable low-pass filter is optically implemented on the image.
5 more elements
Dependencies are inferred from the claim text.