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Display of Continuous Tone Image

IP.com Disclosure Number: IPCOM000062619D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Asano, H: AUTHOR

Abstract

This article describes a display of continuous tone image wherein input signal levels representing the continuous tone image are converted to intensity levels for a display unit along a curve selected by an operator, in order to generate an image with a desired quality. Fig. 1 shows various curves A through G upon which the input signal levels which represent the continuous tone image are converted to intensity levels for the display unit. One of the curves is selected by the operator, as later described. When the curve A is selected, an intensity level YA is generated for an input signal level X. When the curve B is selected, an intensity level YB is generated for the input signal level X. Similarly, intensity levels YC, YD, YE, YF and YG could be generated. (Image Omitted) Fig.

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Display of Continuous Tone Image

This article describes a display of continuous tone image wherein input signal levels representing the continuous tone image are converted to intensity levels for a display unit along a curve selected by an operator, in order to generate an image with a desired quality. Fig. 1 shows various curves A through G upon which the input signal levels which represent the continuous tone image are converted to intensity levels for the display unit. One of the curves is selected by the operator, as later described. When the curve A is selected, an intensity level YA is generated for an input signal level X. When the curve B is selected, an intensity level YB is generated for the input signal level X. Similarly, intensity levels YC, YD, YE, YF and YG could be generated.

(Image Omitted)

Fig. 2 shows a circuit for generating the intensity levels in the manner described above. The input signal levels are supplied to an analog-to-digital converter (ADC) 1, which converts the input signal level to a digital signal. A read-only memory (ROM) 4 stores seven tables. The first table stores the intensity levels along the curve A, the second table stores the intensity levels along the curve B, and so on. The digital signals from the ADC 1 are used as addresses for accessing the table. One of the tables is selected by an operator-controlled switch 2. More particularly, an ADC 3 is supplied with a voltage level from a voltage source +V through a resistor...