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Method for Scaling Gray Level Image

IP.com Disclosure Number: IPCOM000034694D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Kumakura, K: AUTHOR [+2]

Abstract

Disclosed is a method for scaling a gray level image by using a reference table which contains the control values for each picture element in the gray level image. Fig. 1 shows an original image of one scan line which includes plural picture elements. Each picture element has a gray level value. The reference table is in one-to-one correspondence with the original image. The table length is equal to the original line. The reference table elements contain either bits "0" or "1". The number of the bits "1" and the distribution of them in the table are decided in accordance with a reduction ratio. If a reduction ratio of 89% is selected, the reference table contains eleven bit "1's" per 100 elements, which are appropriately distributed.

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Method for Scaling Gray Level Image

Disclosed is a method for scaling a gray level image by using a reference table which contains the control values for each picture element in the gray level image. Fig. 1 shows an original image of one scan line which includes plural picture elements. Each picture element has a gray level value. The reference table is in one-to-one correspondence with the original image. The table length is equal to the original line. The reference table elements contain either bits "0" or "1". The number of the bits "1" and the distribution of them in the table are decided in accordance with a reduction ratio. If a reduction ratio of 89% is selected, the reference table contains eleven bit "1's" per 100 elements, which are appropriately distributed. The number of picture elements in the original image is reduced to make a reduced image in the following manner.

(Image Omitted)

The reduction is sequentially processed from the first element to the end of the original image. The element position being processed in the original image is called as a current position. When the reference table element of the current position contains bit "0" and its preceding position also contains bit "0", the picture element corresponding to the current position remains in the reduced image. Examples are at the picture elements P(1) and P(4), where Q(1)=P(1) and A(3)=P(4). When the current position of the reference table contains bit "1", the bits in its succeeding element pos...