Samsung Electronics Co., Ltd.

Ball Semiconductor Corporation

Hideki Koide

Young-Chul Kim

Yong-Woo Park

Atsuyuki Fukano

Zhiqiang Feng

Dong-Yool Kim

Min-Ki Yeo

Hong-Jik Lee

The present invention provides a method for segmenting and mapping a two-dimensional conventional circuit pattern to a flat mask for projection onto a three-dimensional surface. The circuit pattern is first segmented into a plurality of circuit segments enclosed in a plurality of base units of an imposed grid system. Subsequently, locations and the boundary conditions for a plurality of mask segments on the mask are determined such that no unneeded overlapping at the boundaries of the projected image on the spherical shaped semiconductor device is possible. The mask, along with a photolithography system having a plurality of mirrors, projects the circuit pattern onto the spherical shaped semiconductor device.

System and method for generating a flat mask design for projecting a circuit pattern to a spherical semiconductor device

A document image signal processor of gray level for use in a facsimile. The document image signal processor establishes a local window and a broad window from document image signals scanned by a CCD image sensor. An average level and a level difference between a maximum and a minimum level of the image signals are extracted from the local window. A maximum threshold of the background of the document image is extracted from the broad window. Thus, the image signals can be binarized with an adaptive threshold. Accordingly, the inventive image signal processor provides improved image, although the document image is collected (scanned) from a material whose brightness distribution is considerably ununiform. The document image signal processor includes a line-memory for reading/writing the document image signal, a local window register for forming a local image window, a broad window register for forming a broad image window register, an address and clock generator for generating address and control clocks, and an adaptive threshold logic unit for producing black/white decision logic of the center pixel.

Document image signal processor having an adaptive threshold

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Tokyo, Japan

Hideki Koide