Image reading apparatus and image processing apparatus

• US 6,527,182 B1
• Filed: 04/28/2000
• Issued: 03/04/2003
• Est. Priority Date: 06/04/1999
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Noda, Tsugio, Chiba, Hirotaka
• Primary Examiner(s): Le, Thien M.
• Assistant Examiner(s): WALSH, DANIEL I
• Application Number:
  US09/560,353
• Time in Patent Office: 1,040 Days
• Field of Search: 235/462.11, 235/454, 235/462.41, 235/462.33, 235/462.32, 235/462.21, 235/462.24
• US Class Current: 235/462.11
• CPC Class Codes: H04N 1/047 Detection, control or error compensation of scanning velocity or position H04N1/0402 and H04N1/17 take precedence
• CPC Class Codes: H04N 1/107 with manual scanning
• CPC Class Codes: H04N 1/3263 of reading apparatus or transmitter, e.g. original jam
• CPC Class Codes: H04N 1/32678 Performing substitution, e.g. substitute reception or substituting a corrupted line of data H04N1/32384 takes precedence
• CPC Class Codes: H04N 2201/02439 Positioning method
• CPC Class Codes: H04N 2201/0471 using dedicated detectors
• CPC Class Codes: H04N 2201/04724 on a separate encoder wheel
• CPC Class Codes: H04N 2201/04734 Detecting at frequent intervals, e.g. once per line for sub-scan control
• CPC Class Codes: H04N 2201/04787 by changing or controlling the addresses or values of pixels, e.g. in an array, in a memory, by interpolation
• CPC Class Codes: H04N 2201/04794 Varying the control or compensation during the scan, e.g. using continuous feedback or from line to line

Abstract

An image reading apparatus comprises an image reading section which optically reads one line of an image on a paper at a specific time interval and inputs the acquired image data to an image signal processing section which converts the image data into a binary image data. An amount of movement detection section is provided which outputs a signal to an image data generation section when the image reading section moves by one line. When such a signal is received more than one time during one time interval, the image data generation section generates a binary image data corresponding to the number of lines whose data is not available from the binary image data for a line acquired during that time interval.

Claims

1. An image reading apparatus which optically reads an image divided into a plurality of lines on a medium, said image reading apparatus comprising:

an image reading unit which obtains an image data corresponding to the image on the medium by reading the image of a single line at a predetermined time interval;

an amount of movement detection unit which detects an amount of movement of said image reading unit relative to said medium; and

an image data generation unit which generates an image data based on a result of detection by said amount of movement detection unit in such a manner as to attain a same number of lines as the number of lines by which said image reading unit is moved.

2. The image reading apparatus according to claim 1, wherein said image data generation unit generates the image data corresponding to a plurality of lines based on the image data of one line acquired by said image reading unit when said image reading unit has moved for a plurality of the lines during one time interval.

3. The image reading apparatus according to claim 2, wherein said image data generation unit generates the image data corresponding to a plurality of lines by duplicating the image data of one line acquired by said image reading unit when said image reading unit has moved for a plurality of the lines during one time interval.

4. The image apparatus according to claim 1, further comprising:

a storage unit; and

a transfer unit which causes said storage unit to store the image data acquired by said image reading unit and the image data generated by said image data generation unit, reads the image data from said storage unit, and transfers the image data to an external device through an interface.

5. An image reading apparatus which optically reads an image divided into a plurality of lines on a medium, said image reading apparatus comprising:

an image reading unit which obtains an image data corresponding to the image on the medium by reading the image of a single line at a predetermined time interval;

an amount of movement detection unit which detects an amount of movement of said image reading unit relative to said medium; and

a transfer unit which transfers the image data acquired by said image reading unit and a detection result of said amount of movement detection unit through an interface; and

an image data generation unit which generates an image data based on said image data transferred by said transfer unit and said result of detection of said amount of movement detection unit in such a manner as to attain a same number of lines as the number of lines by which said image reading unit is moved.

6. The image reading apparatus according to claim 5, wherein said image data generation unit generates the image data corresponding to a plurality of lines based on the image data of one line acquired by said image reading unit when said image reading unit has moved for a plurality of the lines during one time interval.

7. The image reading apparatus according to claim 6, wherein said image data generation unit generates the image data corresponding to a plurality of lines by duplicating the image data of one line acquired by said image reading unit when said image reading unit has moved for a plurality of the lines during one time interval.

8. An image processing apparatus which processes an image divided into a plurality of lines to be optically read from a medium, said image processing apparatus comprising:

an image reading unit which obtains an image data corresponding to the image on the medium by reading the image of a single line at a predetermined time interval;

an amount of movement detection unit which detects an amount of movement of said image reading unit relative to said medium; and

an image data generation unit which generates an image data based on a result of detection by said amount of movement detection unit in such a manner as to attain a same number of lines as the number of lines by which said image reading unit is moved.

9. An image processing apparatus which receives image data from an image reading apparatus, which image reading apparatus obtains the image data by reading a single line of an image divided into a plurality of lines on a medium at a predetermined time interval, said image processing apparatus comprising:

an image data generation unit which duplicates the received image data for one time interval to attain a same number of lines as the number of lines moved relatively by said image reading apparatus and said image reading medium, when said image reading apparatus and said image reading medium move relative over one line during a reading period of one line in said image reading medium.

10. An image reading apparatus which optically reads an image divided into a plurality of lines on a medium, said image reading apparatus comprising:

an image reading unit which obtains an image data of the image on the medium by reading the image of a single line at a predetermined time interval when moved relative to said medium,

a detection unit which detects a number of lines for which said image reading unit is moved during one time interval; and

an image data generation unit which generates an image data corresponding to lines for which the image data is not available when the number of lines corresponding to which image data is acquired by said image reading unit is less then the number of lines detected by said detection unit.

11. An image reading apparatus comprising:

an image reading unit which reads one of a plurality of lines of an image at every specific time interval, the image being printed on a medium;

a detection unit which detects a relative amount of movement between said image reading unit and said medium; and

a control unit which calculates a relative amount of movement between said image reading unit and said medium during a time period required for reading one line of the image, determines if the calculated relative amount of movement is greater than a width of one line, when the calculated relative amount of movement is greater than the width of one line determines a number of lines equivalent to the calculated relative amount of movement, and outputs an image data for the determined number of lines by coping the image data read by said image reading unit.

12. An image reading apparatus comprising:

an image reading unit which reads one of a plurality of lines of an image at every specific time interval, the image being printed on a medium;

a detection unit which detects a relative amount of movement between said image reading unit and said medium, and outputs a signal each time when a detected relative amount of movement becomes equal to a width of one line; and

a control unit which determines the number of times a signal is output by said detection unit during a time period required for reading one line of the image, when the signal is output for a plurality of times outputs an image data for a number of lines corresponding to the number of times the signal is output by coping the image data read by said image reading unit, and when no signal is output does not output the image data read by said image reading unit.