IP Library › Granted Patent US 7,012,720
Granted Patent B2
US 7,012,720 · App. 10/047,680 · Granted Mar 14, 2006

Method of effacing zipper image

View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 7,012,720
App. No.
10/047,680
Granted
Mar 14, 2006
Kind
B2
Abstract

A method of effacing zipper image, applicable to scan a document by a scanner with a stagger charge-coupled device. The nth (n is a positive integer) pixel obtained by scan on a scan line at which the zipper image is produced is subtracted by the (n+1)th pixel obtained by scan on the scan line. The absolute value of the result is then compared to a critical value. If the result is smaller than the critical value, the nth pixel is the nth pixel modified as the nth pixel after process.

Claims (8)

1. A method to effacing a zipper image, applicable to scan a document using a scanner with a stagger charge-coupled device, the method comprising:

determining whether the absolute value of a result of subtracting a nth pixel obtained by scan on a scan line on which the zipper image is produced by a (n+1)th pixel obtained by scan on the scan line is smaller than a critical value; and

modifying the nth pixel obtained by scan as a nth pixel after being processed if the result is smaller than the critical value.

2. The method according to claim 1 , wherein the nth pixel after being processed equals to one half of a sum of the nth pixel and the (n+1)th pixel obtained by scan.

3. The method according to claim 1 , wherein the nth pixel after being processed equals to one half of the nth pixel obtained by scan plus one half of the (n+1)th pixel obtained by scan.

4. The method according to claim 1 , wherein the nth pixel obtained by scan is not processed if the result is larger than the critical value.

5. The method according to claim 1 , wherein the critical value is a predetermined value.

6. The method according to claim 1 , wherein the critical value can be adjusted according to the modulation transfer function of the scanner with the stagger charge-coupled device.