Printing with text enhancement: recognition by sensing paired ed

Details Printing with text enhancement: recognition by sensing paired ed Printing with text enhancement: recognition by sensing paired ed

1996-05-10

1999-08-31

Lee, Thomas D.

Image analysis

Image enhancement or restoration

382266, 358462, 358532, G06K 940, H04N 140

Patent

active

059464208

ABSTRACT:
Text is recognized in a scanned image, by sensing left and right edges, preferably in coincidence in all three color planes--or otherwise to determine edges in black. Such edge sensing is preferably done by convolution of the input pixel stream with a windowed vertical jump, yielding narrow peaks of opposite directedness at beginning and end of each character stroke. Textual material is indicated where such peaks alternate in directedness. Concurrent testing is desirable also for dark pixels between beginning and end of each stroke--and light pixels between end of one stroke and beginning of the next. In addition it is preferable to test for an appropriate (black and white) mix of pixels in each candidate text region. A preliminary test is conducted to determine whether a region being scanned is pictorial; in this case the entire edge-detection protocol with associated tests is bypassed, on the operating assumption that black-and-white text cannot be present in a region that is pictorial. The pictorial-region test consists of determining whether only very few light pixels are present.

REFERENCES:
patent: 5296939 (1994-03-01), Suzuki
patent: 5375197 (1994-12-01), Kang
patent: 5392365 (1995-02-01), Steinkirchner
patent: 5485534 (1996-01-01), Takemoto et al.
patent: 5745596 (1998-04-01), Jefferson

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