US 2003/0141469 A1 · Image reading method and apparatus

Abstract

An image reading method and apparatus for reading an image signal by exposure to reading light L2 from a radiation solid-state detector, where radiation image information is recorded by exposure to recording light L1, suppresses degradation of image quality such as the S/N ratio of a reproduced image, the degradation being caused by an effect of charges which are produced by exposure to excessive radiation or the like and remains in the radiation solid-state detector. In the image reading method and apparatus, a past image signal read regarding past image information recorded in the radiation solid-state detector in the past, and an elapsed time from a time of recording the past image information in the radiation solid-state detector to a time of recording the current radiation image information are stored. The current image signal is then corrected based on the recorded past image information and the elapsed time.

Claims13

Dependent claims

A method of reading an image for reading an image signal in accordance with image information from a solid-state detector, where the image information is recorded by exposure to a reading electromagnetic wave holding the image information, the method comprising the steps of:

storing a past image signal read regarding past image information, which is recorded in the solid-state detector before the image information is recorded in the solid-state detector, and a time T1 as a time of recording the past image information in the solid-state detector or a time of reading the past image information from the solid-state detector;
acquiring a time T2 as a time of recording the image information;
calculating an elapsed time from the time of recording the past image information or the time of reading the past image information to the time of recording the image information based on the time T1 and the time T2;
and
correcting the current image signal based on the past image signal and the elapsed time.

2 more elements

An image reading apparatus including a solid-state detector for accumulating charges produced by exposure to a recording electromagnetic wave holding image information to record the image information, and a reading means for reading an image signal in accordance with the image information recorded in the solid-state detector, the image reading apparatus comprising:

a memory means for storing a past image signal read regarding past image information by the reading means, the past image information being recorded in the solid-state detector before the image information is recorded in the solid-state detector, and a time T1 as a time of recording the past image information in the solid-state detector or a time of reading the past image information from the solid-state detector;
an elapsed time calculation means for acquiring a time T2 as a time of recording the image information and calculating an elapsed time from the time of recording the past image information or the time of reading the past image information to the time of recording the image information based on the time T1 and the time T2;
and
a correction means for correcting the current image signal based on the past image signal stored in the memory means and the elapsed time.

1 more element

Dependencies are inferred from the claim text.

Image reading method and apparatus

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Image reading method and apparatus

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Abstract

Claims13