JPS6055867B2 - Hand scanner type image input device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a hand scanner type image input device that can easily input an accurate image without distortion.

[Prior art and its problems]

Image input devices used in information providing services include cameras, drum scanners, fax machines, and the like.

A digital TV camera requires a large-scale light source to evenly illuminate the paper on which the image to be read is written, and the focus of the lens system must be adjusted. In addition, for drum scanners, State, -&-Li, 9,
Li゛ 1, ^ ■ 1 to? ,! There is a problem with 3Jt noise, and a special shock absorber is required to prevent negative effects on peripheral equipment.

Furthermore, in the case of FAX, it is undeniable that the configuration becomes complicated, such as requiring highly accurate paper feeding control. On the other hand, there is a hand scanner as an image input device with a simple configuration.

This hand scanner is held by an operator and manually scans the paper surface. However, due to the inclination of the hand scanner with respect to the manual scanning direction, there is a problem in that the image read and input is likely to be distorted. [Object of the Invention] The present invention has been made in consideration of the above circumstances, and its purpose is to accurately read and input images written on paper without causing distortion. An object of the present invention is to provide a hand scanner type image input device.

[Summary of the invention]

The present invention involves writing a sheet of paper at a predetermined position on a tablet board, manually scanning the surface of the paper placed on the tablet board using a hand scanner with a built-in line sensor, and
The image to be read written on the paper is read and inputted by the line sensor, and position detection elements are incorporated in a plurality of locations of the hand scanner, and position information detected by the position detection element on the tablet board is detected. The scanning position of the line sensor with respect to the paper placed at a predetermined position on the tablet board is detected from the positional relationship between the position detection element and the line sensor in the hand scanner. The image distortion that occurs when the line sensor reads the image according to the scanning position information is corrected.

〔Effect of the invention〕

Thus, according to the present invention, it is possible to easily and accurately detect the scanning position of the line sensor relative to the paper by using the position detection element built into the hand scanner and the tablet board, and to correct the distortion of the read image. can.

Therefore, even if a hand scanner is scanned while tilted with respect to the scanning direction and an image written on a paper is read and input, the image distortion caused by this tilt is corrected, so that accurate image input is possible. It becomes possible. Therefore, together with the operability of the hand scanner, it becomes possible to input images easily and accurately, and it becomes possible to apply it as a simple image input means in various information providing services such as drawing editing.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an embodiment apparatus, and FIG. 2 is a diagram showing an example configuration of a hand scanner section thereof.

A sheet 1 on which an image to be read is written is placed at a predetermined position on a tablet board 2, as shown in FIG. 2, and the image is read and inputted by a hand scanner 3.

The hand scanner 3 includes a line sensor 5 formed by arranging a plurality of imaging elements in a straight line, and this line sensor 5.
It is constructed by incorporating an optical lens system 4 provided in front of the paper 1, lamps 6a and 6b for illuminating the paper 1, and two pickup coils 7a and 7b as position detection elements. Note that the two pickup coils 7a and 7b are
Here, they are installed at both ends of the line sensor 5 in the line direction.

This hand scanner 3 forms an image written on the paper 1 illuminated by the lamps 6a and 6b on the imaging surface of the line sensor 5 via the optical lens system 4, and reads and inputs the image information. .

The hand scanner 3 is held in place by an operator and manually scans one side of the sheet placed at a predetermined position on the tablet board 2. Scanning by the hand scanner 3 is basically performed in a direction perpendicular to the line direction of the line sensor 5 (the direction in which the imaging elements are arranged). By scanning with this hand scanner 3, the drawing lines written on the paper 1 are read and input line by line. On the other hand, the tablet board 2 is made of, for example, a magnetostrictive type, and detects the positions of two pickup coils 7a and 7b incorporated in the hand scanner 3, respectively.

According to the detection position information on the tablet board 2 of these pickup coils 7a and 7b, the image reading area of the line sensor 5 with respect to the paper 1 placed at a predetermined position on the tablet board 2 is detected. Here, the image reading area (scanning position) of the line sensor 5 with respect to the paper 1 is determined by the pickup coil 7 because the positional relationship between the line sensor 5 and the pickup coils 7a, 7b in the hand scanner 3 is known at the time of installation.
The position of each imaging element of the line sensor 5 is calculated from the detected position information of a and 7b.

Detection of the image reading area of the line sensor 5 with respect to the paper 1 is performed at a predetermined timing synchronized with the image reading operation of the line sensor 5, for example, every time image reading for one line is started. Now, in FIG. 1, reference numeral 11 denotes an image input section including the aforementioned line sensor 5, its driving circuit, and the like. The image information read and input line by line through the image input section 11 is digitally encoded by the A/D converter 12 and then transferred to the image memory 13.
In other words, the image information read and input line by line by the line sensor 5 is outputted from the image input section 11 as a time series of image data read out in the line direction, digitally encoded, and sequentially stored in the image memory 13. be transferred.

Reference numeral 14 in the figure is an address input section consisting of the tablet board 2 and its drive circuit.

The address input section 14 inputs position information of the pickup coils 7a and 7b incorporated in the hand scanner 3 at a timing synchronized with the image reading input operation of the line sensor 5. The address signal processing unit 15 sequentially specifies addresses in the image memory 13 by calculating based on the detected position information input from the address input unit 14. This sequential designation of the addresses of the image memory 13 is performed in synchronization with the transfer of image data from the image input section 11 to the image memory 13. That is, the address signal processing unit 15 uses the positional information of the pickup coils 7a and 7b detected in synchronization with the image reading of each line by the line sensor 5 to determine the position of each imaging element of the line sensor 5 at the time of inputting the image reading. The position of each is calculated.

Then, from each position data of these imaging elements, the write address of the image data to be transferred to the image memory 13 in the above-mentioned chronological order is determined, and the address data is outputted in chronological order in synchronization with the transfer of the above-mentioned image data. .

In response to such address designation, image data read and input via the line sensor 5 is written into the image memory 13 according to the image reading area (scanning position) of the line sensor 5 with respect to the paper 1. Specifically, as shown in FIG. 3, when a character image of j large j is read and input by the line sensor 5, image information for one line in a direction perpendicular to the scanning direction of the hand scanner 3 is read and input. Then, image information for one line tilted from that direction is read and input by the line sensor 5.

However, in this case, the image information writing address of the image memory 13 is designated in accordance with the inclination of the line sensor 5 by the address control described above. As a result, the image information read and input by the line sensor 5 tilted from the direction perpendicular to the scanning direction is
are respectively written into address areas of the image memory 13 set according to the inclination of the image. Therefore, even if the hand scanner 3 is scanned while being tilted from a direction perpendicular to the scanning direction, the image information sequentially written onto the image memory 13 will be an accurate image without distortion.

The image information written in the image memory 3 in this way is converted to a predetermined size via the enlargement/reduction circuit 16, and then converted to a predetermined size via the D/A converter 17. It is converted into an analog signal and displayed on the display 18. This image enlargement/reduction process and a series of other image processes are controlled based on control information given to the system control unit 20 from the terminal keyboard 19. As explained above, according to the present device, the distortion of the read image caused by the tilt of the hand scanner 3 during manual scanning can be easily corrected, and the image information can be input accurately. .

Note that the present invention is not limited to the embodiments described above.

For example, three or more pickup coils may be provided to detect the scanning position of the line sensor 5. Moreover, as the tablet board 2, it is also possible to use a device other than the above-mentioned magnetostrictive type. In short, the present invention places a sheet of paper at a predetermined position on a tablet board, and detects the inclination in the scanning direction of a line sensor that is incorporated into a hand scanner that scans the surface of the sheet and reads the image information. The purpose is to correct the distortion of the image read and input by the line sensor by detecting the position information of the built-in position detection element on the tablet board, and various modifications may be made without departing from the gist thereof. It can be implemented by

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram of a hand scanner section, and FIG. 3 is a diagram showing an example of image input. 1... Paper, 2... Tablet board, 3
...Hand scanner, 5...Line sensor, 7a, 7b...Zeck up coil.

Claims (1)

[Claims] 1. A tablet board on which the paper is placed at a predetermined position, a hand scanner that has a built-in line sensor for reading the image written on the paper and manually scans the paper surface, and works together with the tablet board. position detection elements incorporated in each of a plurality of locations of the hand scanner to detect the scanning position of the line sensor with respect to the paper; 1. A hand scanner type image input device comprising means for correcting distortion or deviation of an image read by a sensor.