JPH0456465A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To shorten time for transmission by detecting the inclination of the document picture of an original, turning a scanner only for the inclination and correcting the distortion of a reproduced picture caused by the turn of the scanner. CONSTITUTION:An inclination detecting circuit 6 detects the amount of inclination in a character string corresponding to picture information stored in a memory 5 for detecting inclination. The detected inclination is applied to a CCD rotation motor control circuit 7 and the CCD of a scanner 1 is rotated only for the inclination. Afterwards, when the CCD is not made rectangular to the direction of advancing paper, it is corrected by adding white dots to the heads of respective lines by a white dot adding circuit 9, and encoding is executed by an encoder circuit 10. Thus, since a space or a ruled line between character strings or lines is set in the almost same line, change points can be decreased as a whole and time for transmission can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a facsimile machine, and more particularly to a facsimile machine that reads a horizontally written document image with a scanner and transmits it as binary information.

[Prior art and problems to be solved by the invention] In conventional facsimile machines, even when a document with a horizontally written document image is loaded at an angle, the scanner reads the skewed image as it is, encodes it, and sends it to the recipient. It is transmitting. However, facsimile encoding uses a run-length method, and the fewer changing points in a read image, the fewer codes there are and the shorter the transmission time.

FIGS. 4 and 5 are diagrams for explaining the influence on encoding when the document is tilted and when it is not tilted.

If a document is read at an angle, the inclination of the document will have little effect on the inside and surroundings of the character string during encoding, and the number of change points will not change. However, the larger the run length, such as spaces between lines and ruled lines, the greater the effect. It can be seen that the number of points of change is increased compared to the case where blank spaces and ruled lines are divided into separate lines. In addition, the number of bits when encoding using the MR method with the left end as the starting point and the right end as the end point within the range shown in FIG. 4 is as shown in FIG. 5, and as shown in FIG. As shown in FIG. 5(b), it can be seen that the number of bits in the case where there is no slope is greater than in the case where there is no slope. As described above, when a document image is read and encoded with a scanner while the document is tilted, there is a problem in that the transmission time becomes long.

Therefore, a main object of the present invention is to provide a facsimile apparatus that can reduce transmission time even when a document is read in a tilted state by encoding the document with the tilt set to zero.

[Means for Solving the Problems] The present invention is a facsimile device that reads a horizontally written document image using a scanner and transmits it as binary information, and which detects the tilt when the document image is read tilted.
A scanner rotation means rotates the scanner by the detected tilt, and a correction means corrects distortion of a reproduced image caused by rotating the scanner.

[Function] The facsimile device according to the present invention calculates the amount of tilt from the end point of a read tilted document image, rotates the scanner by that amount to make the tilt zero, and prevents distortion of the reproduced image due to the rotation of the scanner. I tried to correct it, so
Space between two lines of string.

By making the ruled lines substantially the same, the number of changing points can be reduced as a whole, and the transmission time can be shortened.

[Embodiments of the invention] FIG. 1 is a schematic block diagram of an embodiment of the present invention.

First, the configuration of an embodiment of the present invention will be described with reference to FIG. A scanner 1 reads a document image of an original and supplies the read image signal to a binarization circuit 2. 2
The digitizing circuit 2 binarizes the read image signal and supplies it to the line memory 3. The line memory 3 stores the binarized image signal. The stored image signal is applied to a character string detection circuit 4, and the character string is detected based on changes in the gray level. When a character string is detected, the distance from it is approximately 3 cm (
Image signals of an area of about 240 lines (8 lines/mm) are stored in the tilt detection memory 5. The tilt detection circuit 6 detects the amount of tilt of the character string according to the image information stored in the tilt detection memory 5. Such a method of detecting tilt is described, for example, in "Method and device for detecting tilt of document images".
(Patent Application Hei 1-330595) or Nakamura, Minka, Kaihon,
"Character region extraction algorithm for mixed-mode communication" presented by Minami et al. (IEICE Journal Mo1
．． J67-DNo., 11 Nov, 1984).

The inclination θ detected by the inclination detection circuit 6 is given to the CCD rotation motor control circuit 7, and the CCD of the scanner 1 is rotated by the inclination θ. Thereafter, the document or the scanner is returned to the starting point, and the document is scanned again to begin reading. Here, if the COD is not perpendicular to the traveling direction of the paper, the reproduced image will become a parallelogram as shown in FIG. 3, which will be described later.
A white dot is added to the beginning of each line for correction. The number of dots to be added is [Y*tanθ], where Y is the count value of the sub-scanning line counter 8 (the opening is a Gauss symbol). After the rotation of the CCD for tilt correction and the addition of white dots for distortion correction in this manner, encoding is performed by the encoding circuit 10.

FIG. 2 is a flowchart for explaining the operation of an embodiment of the present invention, and FIG. 3 is a diagram for explaining correction of the tilt of a document according to an embodiment of the invention.

Next, with reference to FIGS. 1 to 3, a specific operation of an embodiment of the present invention will be described.

If the document is read tilted by the angle θ, the reproduced image will become as shown in FIG. 3(a), and the transmission time will become longer. When the document image of the original is read by the scanner 1, the image signal is binarized by the binarization circuit 2 and stored in the line memory 3. Based on the stored image signal, the character string detection circuit 4 is Detect strings. When a character string is detected, 3 characters from the beginning are stored in the memory 5 for tilt detection.
An image signal of an area of about cm is stored, and the tilt detection circuit 6
detects the amount of tilt of the string. The CCD rotation motor control circuit 7 tilts the CCD of the scanner 1 by the detected tilt angle θ. When the tilt angle is detected, the original or scanner 1
is returned to the starting point, scanned again, and reading begins. Although the tilt of the CCD eliminates the tilt of the read character string, the reproduced image becomes a parallelogram as shown in FIG. 3(b). For this reason,
Based on the count value Y of the sub-scanning line counter 8, [Y*
As shown in FIG. 3(c), tanθ white dots are
It is added to the beginning of each line and corrected. After white dots are added for tilt correction and distortion correction in this manner, the image is encoded by the encoding circuit 10.

As mentioned above, by encoding the document image with the tilt set to 0, the blank space between two lines of character strings is created.

Since the ruled lines are substantially the same, the number of changing points is reduced as a whole, and the transmission time can be shortened.

[Effects of the Invention] As described above, according to the present invention, the tilt of the document image of the original is detected, the scanner is rotated by the detected tilt, and the distortion of the reproduced image caused by rotating the scanner is corrected. So I made it to be a string.

The spaces between lines and the ruled lines are almost the same, reducing the number of changing points as a whole and shortening the transmission time.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an embodiment of the present invention. FIG. 2 is a flow diagram for explaining the operation of one embodiment of the present invention. FIG. 3 is a diagram for explaining correction of tilt and correction of distortion of a reproduced image according to an embodiment of the present invention. FIGS. 4 and 5 are diagrams for explaining the influence of the inclination of a document on encoding. In the figure, 1 is a scanner, 2 is a binarization circuit, 3 is a line memory, 4 is a character string detection circuit, 5 is a memory for tilt detection, 6 is a tilt detection circuit, 7 is a CCD rotation motor control circuit,
8 is a sub-scanning line counter, 9 is a white dot adding circuit, and 10 is an encoding circuit. Patent 8 applicant Sharp Corporation (and 2 others) Figure 2 (a) (b) (C)

Claims (1)

[Scope of Claims] A facsimile device that reads a horizontally written character image with a scanner and transmits it as binary information, comprising: a tilt detection means for detecting the tilt when the document image is read tilted; A facsimile apparatus, comprising: a scanner rotation means for rotating the scanner by the tilt detected by the scanner; and a correction means for correcting distortion of a reproduced image caused by the rotation of the scanner.