Data capture, character recognition OCR ICR OMR CHR BCR, image processing, forms data capture, document indexing, automatic data extraction Data capture, character recognition OCR ICR OMR CHR BCR, image processing, forms data capture, document indexing, automatic data extraction

Keystone Correction

Keystone Correction

When documents scanning and the acquisition plan is not parallel to the plane on which the document, the image obtained suffers of keystone effect, or a distortion due to the effect of perspective. In essence, the lines on the document are parallel, in the scanned image are oblique and convergent.

This effect can be, for example, if you try to photograph a paper document with the camera of your phone, with a webcam or a digital camera.

To solve this optical aberration can use the keystone correction, sometimes also called keystone correction effect or perspective.

Correction of perspective deformation trapezoidal - first Correction of perspective deformation trapezoidal - after

To perform keystone correction, the system identifies the trapeze implies that the paper acquired by searching for edges and automatically calculates a transformation matrix to convert it into a rectangle.

Once the affine transformation was performed and was made a crop automatically, that is an automatic cropping of the image, to exclude the area outside the rectangle so reconstructed, the effect is no longer visible and the document has a very more like a scanned document with a normal document scanner.

For more information on the Keystone Correction technology, it is worthwhile to know how and know our solutions that implement it, you can send us an e-mail to informazioni@recogniform.it or fill in the form below.


Company
Title
First Name
Last Name
Address
Zip Code
State
Country
Phone
Fax
E-mail
Message

Taking note of Information of the policy of personal data (D. Lgs 30 june 2003 n.196 and subsequent amendment and additions), click on the "OK" button i consent to collect, hold, process, communicate, and if appropriate, discontinue the treatment/s of personal data that concern me, for the purposes specified in the policy.