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Title: Arrangement for determining the optimum scan angle for printed documents

Abstract: A sensor, having a plurality of parallel elongated light transducers, is rotated relative to a document to be aligned with a predetermined reference. A signal accumulated from the transducers reaches a distinct maximum when printed lines on the document are aligned with the elongated transducers. Detection of this maximum enables measurement of the angle by which the document is out of alignment.


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Inventors: Chevillat, Pierre (Adliswil, CH)
Schindler, Hans R. (Langnau, CH)

Application Number: 06/155863
Filing Date: 1980-06-02
Publication_date: 1982-07-06
Assignee: IBM

Primary Class(es): 382/290 356/139.050, 356/400, 382/324, 250/559.370, 250/557
Other Classes: G06K9/32; H04N1/00; G06K9/32
US Patent Ref:
3457422July, 1969Rottmann340/146.3HOPTICAL SYSTEM ADAPTED FOR ROTATION OF AN IMAGE TO BE SCANNED WITH REFERENCE TO A SCANNING PATH
3617751November, 1971Levy et al.250/202METHOD AND APPARATUS FOR ARTICLE POSITIONING UTILIZING AN INCREMENTAL ARTICLE DRIVE SYSTEM AND NULL TRANSIT COUNTER
3701098October, 1972Acker340/146.3ZDEVICE FOR MACHINE READING OF INFORMATION WITHOUT MANIPULATION OF THE INFORMATION CARRIER
3727184April, 1973Roza et al.340/146.3HPOSITION DETECTOR FOR CHARACTERS
3774014November, 1973Berler250/557PRINTED CODE SCANNING SYSTEM
3811110May, 1974Inose et al.340/146.3HARRANGEMENT FOR NORMALIZING TWO-DIMENSIONAL PATTERN
3820069June, 1974Krewson et al.340/146.3HELECTRO-OPTICAL READ SYSTEM
3831146August, 1974Rundle340/146.3HOPTIMUM SCAN ANGLE DETERMINING MEANS
3847346November, 1974Dolch340/146.3HDATA FIELD RECOGNITION AND READING METHOD AND SYSTEM
4097750June, 1978Lewis et al.250/548Method of orienting objects using optically smeared images
4105925August, 1978Rossol et al.250/561Optical object locator
4142105February, 1979Erdmann250/548Method for producing a switching signal on the passage of a contrast jump
4168488September, 1979Evans340/146.3HImage rotation apparatus
4201378May, 1980Hams250/561Skew detector
4238780December, 1980Doemens340/146.3HProcess and an apparatus for automatically recognizing the position of semiconductor elements

Other Refs: JP54-935GB2035551
June, 1979340/146.3H
June, 1980340/146.3H
Other References: Allen, IBM Tech. Disclosure Bulletin, vol. 1, No.1, Jun. 1958, "Skew Compensator", p. 4.
Bishop et al., IBM Tech. Disclosure Bulletin, vol. 21, No. 9, Feb., 1979, "Character Recognition Approach Involving Histogram Classification", pp. 3461-3467.
Tersoff, Proc. of Eastern Comp. Conf., 1957, "Automatic Registration in High-Speed Character Sensing Equipment", pp. 238-242.

Primary Examiner: Boudreau, Leo H.
Assistant Examiner:
Attorney: Coffman, Ronald E.
Claims:
Having t