US 5,856,850 AGranted

Image display system for converting between display standards with a reduced distortion

AssigneeNEC Corporation

InventorMakoto Miyazaki

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Abstract

An image display system, in which a display image of a monitor of the first scanning system is taken by a TV camera of the second scanning system to pick up video signals to be displayed on a monitor of the second scanning system. The output of the TV camera of the second scanning system is multiplied by a factor.alpha. (.alpha. is any real number satisfying 0<.alpha.<1) in a first multiplier. This multiplication result is added together with another input value in an adder. The output of the adder is stored in a frame memory. One frame of video signals read out of the adder is multiplied by another factor (1-.alpha.) in the second multiplier. The first and second multiplication results are added together in the adder, and the addition result is returned to the frame memory as feedback. As a result, the video signals output from the TV camera are averaged to prevent an offensive image to the eye of the display.

Claims4

Dependent claims

An image display system, in which a display image of an image display of a first scanning system for displaying image signals produced according to the first scanning system is imaged according to a second scanning system to display an image on an image display of the second scanning system, comprising:

first multiplying means for producing a first multiplication result by multiplying the video signals from a sample most recently taken according to the second scanning system by a predetermined factor .alpha. (.alpha. is any real number satisfying 0<.alpha.<1);
adder means for producing an output by adding a second multiplication result based on an immediately preceding sample to the first multiplication result;
frame memory means for storing the output from the adder means while a successive sample of the video signals is taken according to the second scanning system;
and
second multiplying means for producing the second multiplication result by multiplying contents of the frame memory means by a factor (1-.alpha.), the output of the adder means being displayed on the image display of the second scanning system.

2 more elements

Dependencies are inferred from the claim text.