Back to results
US 7,248,387 B2Granted
Scanning speed control device and method
AssigneeUmax Data Systems Inc.
InventorKuo-Jeng Wang
Life of this patent
Estimating the term…
Abstract
A control device and a method for controlling scanning speed of a scanner. The control device includes a decision device and a driving device. The decision device further includes an image buffer, an up-down counter and a comparator. The decision device receives the input image data and utilizes the up-down counter to compute data access volume inside the image buffer. The comparator decides whether to increase or decrease the scanning speed according to the data access volume and also outputs decision data to the driving device.
Claims9
An apparatus, comprising:
- a decision device coupled to an input device, said decision device capable of receiving input image data and outputting decision data based at least in part on count data and data access volume;
- a driving device coupled to the decision device capable of receiving the decision data and capable of adjusting the scanning speed according to the decision data;
- an image buffer coupled to an output terminal of the input device capable of receiving the input image data, and temporarily storing the input image data and outputting output image data to an input/output interface coupled to the decision device;
- an up-down counter coupled to an input terminal of the image buffer and an output terminal of the image buffer capable of counting and recording data access volume inside the image buffer and outputting count data;
- and
- a comparator coupled to the up-down counter capable of receiving the count data, and deciding whether to increase or decrease the scanning speed according to the count data and outputting the decision data.
3 more elements
A method, comprising:
- providing count data;
- providing a largest data access volume;
- and
- determining the scanning speed of a scanner according to a ratio between the count data and the largest data access volume, wherein the scanner scans at a speed comprising one or more of the following:
- approximately full speed if the count data is greater than approximately ¾ of the largest data access volume, approximately ¾ of full speed if the count data is smaller than approximately ¾ of the largest data access volume but greater than approximately ½ of the largest data access volume, approximately ½ of full speed if the count data is smaller than approximately ¾ of the largest data access volume but greater than approximately ¼ of the largest data access volume, and/or approximately ¼ of full speed if the count data is smaller than approximately ¼ of the largest data access volume, or combinations thereof.
2 more elements
An apparatus, comprising:
- means for providing count data;
- means for providing a largest data access volume;
- and
- means for determining the scanning speed of a scanner according to a ratio between the count data and the largest data access volume, wherein the scanning speed comprises one or more of the following:
- approximately full speed if the count data is greater than approximately ¾ of the largest data access volume, approximately ¾ of full speed if the count data is smaller than approximately ¾ of the largest data access volume but greater than approximately ½ of the largest data access volume, approximately ½ of full speed if the count data is smaller than approximately ¾ of the largest data access volume but greater than approximately ¼ of the largest data access volume, and/or approximately ¼ of full speed if the count data is smaller than approximately ¼ of the largest data access volume, or combinations thereof.
2 more elements
Dependencies are inferred from the claim text.