Method and apparatus for minimizing image signal noise, and radi

Details Method and apparatus for minimizing image signal noise, and radi Method and apparatus for minimizing image signal noise, and radi

1987-03-30

1990-12-11

Howell, Janice A.

Radiant energy

Automatic/serial detection of similar sources

2504841, G01N 2304

Patent

active

049773224

ABSTRACT:
A method of minimizing image signal noise comprises the steps of feeding an image representing an image to a high-frequency component decreasing device for arbitarily decreasing a high-frequency component, detecting the level of the image signal, and decreasing the high-frequency component of the image signal by the high-frequency component decreasing device in accordance with a decrease in the level of the image signal. A radiation image read-out method for exposing a stimulable phosphor sheet carrying a radiation image stored thereon to stimulating rays which cause the stimulable phosphor sheet to emit light in proportion to the stored radiation energy, and photoelectrically detecting the emitted light to obtain an image signal representing the radiation image comprises the steps of detecting the level of radiation energy stored on the stimulable phosphor sheet, and decreasing the high-frequency component of the image signal by the high-frequency component decreasing device in accordance with a decrease in the level of the stored radiation energy.

REFERENCES:
patent: 3696252 (1972-10-01), Chapman
patent: 4322641 (1982-03-01), Packard
patent: 4896222 (1990-01-01), Fukai

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