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Method for corresponding scanned area to previewed and preselected area of image scanning device in normal scan

An image scanning device and scanning range technology, which is applied in the field of image scanning, can solve the problems that the scanning ranges cannot be matched, the pre-selected scanning ranges are different, the scanning ranges are different, and the image ranges are different.

Inactive Publication Date: 2003-10-15
UMAX DATA SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When preview scanning with 50dpi scanning resolution, in the preview state of 50dpi scanning resolution, when you want to select the scanning range of 600dpi scanning resolution, the above-mentioned image line difference will cause the pre-selected range to be scanned with 600dpi scanning resolution The problem that the actual scanning range cannot be mapped, resulting in a difference between the pre-selected scanning range and the actual scanned 600dpi image range, causing inconvenience to the user when selecting the pre-selected range
[0004] According to the above, it is urgent to provide an improved image scanning method for image scanning to solve the above-mentioned shortcoming that the pre-selected scanning range is different from the actual scanning range

Method used

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  • Method for corresponding scanned area to previewed and preselected area of image scanning device in normal scan
  • Method for corresponding scanned area to previewed and preselected area of image scanning device in normal scan

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example 1

[0046] Example 1: Set the design standard adopted by the stepping motor to walk 1 / 600*0.254 meters (1 / 600 inches) at a full step angle, and walk at a stepping speed of a quarter of the step angle with a control pulse Drive the scanning head to scan a document; 50dpi scanning resolution for preview scanning and 600dpi scanning resolution for normal scanning, the exposure time of both image sensors is 5469 pixels, and the scanning length is 8*0.254 meters (8 inches ):

[0047] At 50dpi scanning resolution, 5469=113*48+45, where Q 50 = 48, R 50 =45 and P 50 =113, then E 50，preview =8*50*45 / 113=160 (the remainder enters the value unconditionally);

[0048] At 600dpi scanning resolution, 5469=1367*4+1, where Q 600 = 4, R 600 = 1 and P 600 = 1367, then E 600 =8*600*1 / 1367=4 (remainder unconditionally enters the value);

[0049] A 600 =(600*4*8)-4+160=19356, and L 600 =19356 / 4=4839.

[0050] Therefore, when scanning a length range of 8*0.254 meters (8 inches) at a scannin...

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Abstract

The invention discloses a method of enabling actual scope to be scanned normally by an image-scanner that is mapping the predetermined scope in a preview state. On the premise that pixel is the unit of the linear image sensor and the stepping motor of the image scanner, calculate the additional control pulse numbers of the stepping motor caused by pixel accumulation error in different scanning resolutions, then determine the necessary control pulse numbers of the stepping motor in normal scanning condition. By this way, the actual scope scanned normally is mapping the predetermined scope in a preview state.

Description

field of invention [0001] The invention relates to an image scanning method of an image scanning device; in particular, it relates to a method for solving the difference between the preselected range in the preview state and the normal scanning range. Background of the invention [0002] Traditionally, a desktop scanning device, such as a flatbed scanner, usually uses a stepping motor to drive the scanning head to move and scan an object, document, picture, photo, etc. to scan the content of the object. There is a charge coupled device inside the scanning head, which is a linear sensor and is composed of at least one row of multiple photo-sensing cells. When the stepping motor drives the scanning head to scan an object, the charge-coupled device repeatedly captures a linear image sensing value from the object. Each linear image sensing value corresponds to a plurality of pixels on a captured linear image, that is, an image sensing value captured by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/047
Inventor 李官佑施振祥李镇河
Owner UMAX DATA SYST