Browse Prior Art Database

Elimination of Banding in Digital Image Recording

IP.com Disclosure Number: IPCOM000090189D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Ett, AH: AUTHOR

Abstract

In the recording of image data using a digital positioning system extremely small but highly repetitive positioning errors create a series of streaks in the image termed banding. This banding occurs due to the regularity of the pattern and the errors. The banding effect is eliminated with no reduction in resolution or positional accuracy by superimposing on the deflection signals which position the CRT beam a random noise signal. This equals in amplitude to less than one half of the amplitude of the least significant deflection bit. The randomness thus introduced breaks up the pattern regularity and eliminates the banding effect. Random noise generator 3 is connected to X deflection register 1 and Y deflection register 2.

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Elimination of Banding in Digital Image Recording

In the recording of image data using a digital positioning system extremely small but highly repetitive positioning errors create a series of streaks in the image termed banding. This banding occurs due to the regularity of the pattern and the errors. The banding effect is eliminated with no reduction in resolution or positional accuracy by superimposing on the deflection signals which position the CRT beam a random noise signal. This equals in amplitude to less than one half of the amplitude of the least significant deflection bit. The randomness thus introduced breaks up the pattern regularity and eliminates the banding effect. Random noise generator 3 is connected to X deflection register 1 and Y deflection register 2. The outputs of registers 1 and 2 are connected to yoke 4 which generates magnetic fields for positioning of the electron beam in CRT 5.

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