JPS61171272A - Scanner device - Google Patents

Abstract

PURPOSE:To prevent the distortion of a picture at a right angle against a line sensor, which is caused by the inclination of an original, by controlling a relative speed between the line sensor and the original in correspondence to the variable amount of the height of the original. CONSTITUTION:A picture on the original 101 is formed on the line sensor 103 by a lens 102 and converted into an electrical signal. A distance sensor 104 measures a distance L between the sensor 104 and the original 101 to find a distance between the original 101, the sensor 103 and the lens 102. The distance L is given to a speed control part 201, which calculates a speed command value (v) from a change L/dy in the direction Z height of the original 101 in a direction (y) and drives a drive part 202 with the aid of the command value (v). In accordance of the command value, the drive part 202 shifts any one of the original 101, the sensor 103 and the lens 102 in a direction (y) at a speed (v). At this time, a picture signal I outputted by the sensor 103 is built up in a picture memory 203. Thus the reduction in the direction (y) of picture data, which is caused by the inclination of the original, is canceled even if the height in the direction Z of the original is changed, thereby obtaining a picture without distortion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scanner device for inputting image data from books and the like.

[Conventional technology]

A conventional scanner device scans a document 101 as shown in FIG.
The above image is scanned by the line scanner 10 through the lens 102:
l: Forms an image and converts it into an electrical signal.

Scanning in the X direction is electrically performed by the line scanner 103, and scanning in the X direction is performed by moving either the original 101 or the line scanner 103 and the lens 102 in the X direction at a constant speed. In this way, two-dimensional image data covering the entire surface of the original 101 is input.

[Problem that the invention seeks to solve]

The conventional scanner device described above has no problem with documents that are flat and have no undulations in two directions. Since the read image data is shrunk in the X direction according to the magnitude of the X direction differential of the height in the direction, there is a drawback that image data without distortion cannot be obtained.

[Means for solving problems]

The scanner device of the present invention includes a lens that forms an image on a document, a line sensor that converts the one-dimensional image formed through the lens into an electrical signal and outputs it, and a distance sensor that measures the height of the document. and a speed control section that controls the relative speed between the line sensor and the document in a direction perpendicular to the scanning direction of the line sensor, in accordance with the amount of change in the height of the document measured by the distance sensor.

〔Example〕

Next, details of an embodiment of the present invention will be explained with reference to the drawings.
i! I will clarify.

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a block diagram. In FIG. 1, an image on a document 101 is focused on a line scanner 103 by a lens 102,
converted into an electrical signal.

The distance between the document 101, the line sensor 103, and the lens 102 is determined by the distance sensor 104.
This can be determined by measuring the distance between the document 101 and the document 101. In FIG. 2, the distance measured by the distance controller 104 is given to the speed controller 201, and the speed controller 201 calculates and outputs a designated value V of the change in height of the document 101 in two directions in the y direction. . The speed command value V is a signal that commands the relative speed between the line sensor 103 and the document 101, and VO is the speed command value when scanning a flat document. The driving unit 202 controls the original 101 or the line sensor 103 and the lens 1 according to the speed command ([v).
02 in the y direction at a speed V. At this time, by accumulating the image signal I output from the line sensor 103 in the image memory 203, two-dimensional image data covering the entire surface of the document 101 can be input to the image memo IJ 203K.

〔Effect of the invention〕

The scanner device of the present invention controls the relative speed between the 2-in sensor and the original according to the amount of change in the height of the original, thereby controlling the relative speed of the 2-in sensor and the original in a direction perpendicular to the scanning direction J of the line sensor, that is, in the y direction in FIG. Even if the height of the document changes in two directions, the shrinkage of the image data in the y direction due to the inclination of the document can be offset, so that image data can be obtained without distortion.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a perspective view showing an example of the prior art. 101...JI[,102...kawa lens, 1
o3...2-in sensor, 104...distance sensor, 2o1...speed control section, 202...
... Drive unit, 203 Mountain... Image memory, L... Distance between distance sensor 104 and document 101, V... Speed command value, ■...... image signal. Mustard l TM Early 3 Concave J

Claims (1)

[Claims] A lens that forms an image on a document, a line sensor that converts the one-dimensional image formed through the lens into an electrical signal and outputs it, a distance sensor that measures the height of the document, and a scanning direction of the line sensor. and a speed control unit that controls a relative speed between the line sensor and the document in a direction perpendicular to the document according to an amount of change in the height of the document measured by the distance sensor.