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US 7,460,257 B2Granted
Technique for transferring image information from a scanning apparatus
OwnerChen-Ho Leeinventor
Life of this patent
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Abstract
A technique for transferring image information from scanning apparatus includes adjusting the period of a shift signal according to the speed of reading data from a scan line by a computer instead of using a memory buffer. Therefore, correct data transmission between the image extraction device and the computer can be achieved with the result of reducing the cost of the scanning apparatus.
Claims25
A method of transferring image information from a scanning apparatus, the method comprising:
- providing a transfer signal to an image extraction device in the scanning apparatus, the image extraction device coupled to a computer;
- transmitting data for each pixel of a scan line to the computer via a shift signal without storing the data in a memory buffer of the scanning apparatus;
- adjusting a period of the shift signal based at least in part on a speed of reading the data by the computer, wherein data for all of the pixels of the scan line is transmitted during a period adding a waiting time to shift signal based at least in part on the period of transfer signal.
A method of transferring image information from a scanning apparatus, the method comprising:
- providing a transfer signal to an image extraction device in the scanning apparatus, wherein the scanning apparatus does not include a memory buffer;
- transmitting pixel data for a scan line from the image extraction device to a computer via a shift signal, the shift signal having a cycle time;
- and
- changing the cycle time of the shift signal from a first default cycle time to a second different cycle time if the computer processes the pixel data using an actual processing speed that is different than an expected processing speed, the expected processing speed associated with the first default cycle time.
1 more element
An apparatus, comprising:
- an image extraction means for providing scan line data;
- a timing signal output means for outputting a shift signal, the shift signal to control when the image extraction means initiates transferring portions of the scan line data from the apparatus to an external device;
- and
- a feedback means for detecting a rate that the external device processes the transferred scan line data and feeding back the detected rate to the timing signal output means;
- wherein the timing signal output means is configured to vary a period of the shift signal if the processing rate does not correspond with a transfer time for the scan line data.
2 more elements
A scanner, comprising:
- a light source to illuminate a document supported by a document platform;
- an image extraction device to provide scan line data according to an exposure time;
- and
- signal output circuitry to control transfer of the scan line data from the scanner to an external device, the signal output circuitry operable to:
- generate a signal having a cycle time, the cycle time of the signal controlling a frequency that the scanner initiates transfer of a portion of the scan line data from the scanner to the external device;
- and
- vary the cycle time according to a rate that the external device processes the transferred scan line data.
4 more elements
Dependencies are inferred from the claim text.