US 4,400,737 A · Apparatus for producing and reproducing embedded pattern

Abstract

Apparatus for producing and reproducing embedded patterns in which a character or the like including a pattern which is not observable macroscopically can be differentiated from the other formats microscopically. An input unit reads a normal original image pattern utilizing a raster scanning system. In the apparatus for producing the format, a processing unit includes a gate which receives a signal from the input means and passes or blocks the signal in accordance with the desired embedded pattern. An output unit records the image using the raster scanning system. In the apparatus for reproducing the format, a processing unit includes a gate which blocks or passes an input signal depending on whether or not it contains the embedded pattern.

Claims15

Dependent claims

An apparatus for producing a format with an embedded pattern comprising:

an input unit for reading normal original image patterns in accordance with a raster scanning system;
a processing unit having gate means for receiving an input signal from said input unit and means for controlling said gate means to prevent data of the input signal corresponding to a first plurality of predetermined positions at repeated intervals of a pattern being read by said input unit from passing through said gate means and to permit data of the input signal corresponding to a second plurality of predetermined positions interleaved with said positions of said first plurality of positions to pass through said gate means;
and
an output unit for recording an image by the same raster scanning system as said raster scanning system in accordance with an output from said processing unit.

1 more element

An apparatus for reproducing a format with an embedded pattern comprising:

an input unit for reading an original image containing an image with an embedded pattern comprising a plurality of image elements in accordance with a raster scanning system;
a processing unit having gate means for receiving an input signal from said input unit and means for controlling said gate means to detect an array pattern of peripheral image elements of said input signal for each said image element unit and to pass only image elements corresponding to a predetermined embedded pattern having image elements at and only at a plurality of repeated intervals through said gate means;
and
an output unit for recording an image by the same raster scanning system as said raster scanning system in accordance with an output from said processing unit.

1 more element

Dependencies are inferred from the claim text.

Apparatus for producing and reproducing embedded pattern

Life of this patent

Apparatus for producing and reproducing embedded pattern

Life of this patent

Abstract

Claims15