초록 ▼

An input scanner is disclosed which is adapted to scan an image on an original, such as a radiographic film, and to form a digital representation of the image. The scanner comprises a transparent platen for supporting the film, a light source under the platen, and a plurality of linear arrays of pho

An input scanner is disclosed which is adapted to scan an image on an original, such as a radiographic film, and to form a digital representation of the image. The scanner comprises a transparent platen for supporting the film, a light source under the platen, and a plurality of linear arrays of photosensitive elements located above the platen for receiving light transmitted through the film. In order to improve the signal-to-noise ratio and the dynamic range of the scanner, the signals from adjacent photosensitive elements in the arrays are processed by a combination of analog and digital summing. Different levels of spatial resolution can be selected electronically without changing the physical disposition of the scanner elements.

대표청구항 ▼

An input scanner for forming a digital representation of an image, said input scanner comprising: means for producing a series of image signals indicative of luminous energy received from individual pixels of said image; and means for processing said signals including means for monitoring the level

An input scanner for forming a digital representation of an image, said input scanner comprising: means for producing a series of image signals indicative of luminous energy received from individual pixels of said image; and means for processing said signals including means for monitoring the level of said signals and means for summing said signals, and said summing means including means for summing said signals in a digital mode when the level of said signals is above a predetermined level and means for summing said signals in an analog mode when the level of said signals is below a predetermined level.