Browse Prior Art Database

Image Sensor with Integration Time Control

IP.com Disclosure Number: IPCOM000089471D
Original Publication Date: 1977-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Gaebelein, GN: AUTHOR [+2]

Abstract

The arrangement shown in Fig. 1 provides an image sensing system with control of integration time to obtain relatively constant integration times independent of velocity variance of the scanning system. The system includes a photosensor array 3, a pair of read-out registers 5 and 7 connected to the array, and a pair of control registers 9 and 11. A photo gate or control signal Gp is supplied to the photosensors to read the information out from the sensing array. A second control gate Gs is normally held low to transfer the charges from the photosites in parallel, which then go either directly to the control registers 9 and 11 or to the control registers 9 and 11 via the read out registers 5 a 7.

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Image Sensor with Integration Time Control

The arrangement shown in Fig. 1 provides an image sensing system with control of integration time to obtain relatively constant integration times independent of velocity variance of the scanning system. The system includes a photosensor array 3, a pair of read-out registers 5 and 7 connected to the array, and a pair of control registers 9 and 11. A photo gate or control signal Gp is supplied to the photosensors to read the information out from the sensing array. A second control gate Gs is normally held low to transfer the charges from the photosites in parallel, which then go either directly to the control registers 9 and 11 or to the control registers 9 and 11 via the read out registers 5 a 7. Signals from control registers 9 and 11 are then returned to sink voltages, and the control signal Gs is held high or at an up level to return to the normal integration function, as shown in the waveforms of Fig. 2. Obviously, the read-out registers and control registers can be applied singly to an array rather than in pairs, as shown.

One of the advantages of this arrangement is that the integration time can be constant and independent of velocity variations in the scanning mechanism, and thus the need for integration correction or velocity control is eliminated. Another advantage of the present arrangement is that when the integration time is controlled to be shorter, vertical resolution is improved at the same time.

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