Browse Prior Art Database

Detection of Color (Presence/Absence) in Electronic Image of a Document

IP.com Disclosure Number: IPCOM000117297D
Original Publication Date: 1996-Jan-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Prakash, R: AUTHOR

Abstract

The disclosed technique detects if the document being scanned is monochrome (mono color information on white or single color background). For such a document, there is limited value in saving a color image, since the same information content can be saved as a monochrome image.

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Detection of Color (Presence/Absence) in Electronic Image of a Document

      The disclosed technique detects if the document being scanned
is monochrome (mono color information on white or single color
background).  For such a document, there is limited value in saving a
color image, since the same information content can be saved as a
monochrome image.

The resulting monochrome image uses 3X less storage as compared to
the color image.

      Color scanners are finding more and more use in document
processing.  Frequently, the document is monochrome (mono color
information on white or colored background).  For such a document,
there is limited value in saving a color image, since the same
information content can be saved as a monochrome image.

Note that the color image uses 3X the storage, as compared to the
monochrome image.

      The disclosed technique automatically detect if the document
being scanned, is color.  If not, it facilitates converting to a
monochrome image in order to gain reduction in the image size.

      In a typical color scanner, three rows of CCDs, pick up the RGB
color image (Three videos V1, V2 and V3) of the document of interest.
The three images/video, when combined, reproduce the color image of
the document.

      If one were to examine the relative signal strength of the
three images, i.e., look at the two ratio of three videos
(R1=Avg.V1/Avg.  V3, and R2=Avg.V2/Avg.V3), they show an interesting
property.  In the case where the document was mono color (as defined
earlier), the ratios R1 and R2 remain n...