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IMPROVED UTILIZATION OF ANALOG DELAY IN PIXEL INTERPOLATION

IP.com Disclosure Number: IPCOM000024543D
Original Publication Date: 1980-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 121K

Publishing Venue

Xerox Disclosure Journal

Abstract

In electronic imaging it is often desirable to produce an output with a pixel spatial sample rate different from that of the input or image sensor. One arrangement is to use an analog delay line 5 to provide a linear interpolation between two real pixels. Typically, however, it is necessary for the delay line to be at least one half pixel time in length to perform adequately. Referring to Figures 1 and 2, it can be seen that at time 0, no signal is present at either input 6 or output 7. At time 1, a signal. of 1 is present at input 6 with a signal of -/R 1 present at output 7. At time 2, the signal at the input 6 reaches the output T of delay line 5, giving an output signal of R/Rl + R /R2 or R /Rl' At time 3, no signal is present at input 6 and the signal at output 1 is absor-ed in the delay termination resistor RO coupled to output 7. As a result, an intermediate pixel value is created at times 1, 3.

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IMPROVED UTILIZA NON OF ANALOG DELAY IN PIXEL INTERPOLATION Richard H. Tuhro

Proposed Classification U.S. C1. 358/280 Int. C1. H04n 1/40

In electronic imaging it is often desirable to produce an output with a pixel spatial sample rate different from that of the input or image sensor. One arrangement is to use an analog delay line 5 to provide a linear interpolation between two real pixels. Typically, however, it is necessary for the delay line to be at least one half pixel time in length to perform adequately. Referring to Figures 1 and 2, it can be seen that at time 0, no signal is present at either input 6 or output 7. At time 1, a signal. of 1 is present at input 6 with a signal of ~/R 1 present at output 7. At time 2, the signal at the input 6 reaches the output T of delay line 5, giving an output signal of R/Rl + R /R2 or R /Rl' At time 3, no signal is present at input 6 and the signal at output 1 is absor~ed in the delay termination resistor RO coupled to output 7. As a result, an intermediate pixel value is created at times 1, 3.