JPS6188658A - Picture reading method - Google Patents

Abstract

PURPOSE:To attain exact read start and stop by comparing an input signal for one operation's share with an input signal before one operation or over and regarding it as manual feed stop when the comparison shows that the signal is not changed over two scannings' share so as to avoid the input signal for a picture read signal. CONSTITUTION:An image sensor 5 is put on a character and starts moving n the arrow 7 at a time t0. A signal 9 is an input signal to an image sensor 5 depending on time. Up to an input signal 9-4 at t=t0, the input signal for one scanning (one operation's share), e.g., 9-3 is entirely the same as an input signal by preceding scanning, e.g., a signal 9-3, and in this case, it is regarded that the device is at a standstill, a flag 8 is reset and no picture is read.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an image reading and compiling method that allows obtaining photoelectric conversion signals from characters, figures, etc. written on a manuscript by manual feeding operation. It is.

[Conventional technology]

FIG. 5 shows a conventional reading method using an image sensor in a manual scanning reading device. In this figure, 1 is the original, 2 is the OI, the original 1)
These are figures, etc. (hereinafter simply referred to as characters). 3 is based on the lens element system, and uses either spherical V lenses or focused fiber A/I. 4 is a light source for illuminating the manuscript, such as a tungsten lamp or LED.
Solid-state light sources such as 5 is an image sensor, which may be a one-dimensional image sensor, a two-dimensional image sensor, or a structure in which a plurality of one-dimensional image sensors are arranged side by side. Further, 6 is a switch for manually starting reading.

Due to the movement indicated by the arrow 1, the image sensor 5 reads the characters 2 written on the document 1 through the V-lens optical system 3.

[Problem that the invention attempts to solve]

In the conventional image reading method as described above, the reading start switch 6 is used, which has the disadvantage that it is difficult to synchronize the position of the character 2 on the document 1 with the reading start position. . Also, there was a drawback that the reading ended at 5 due to the stationary state before starting manual feeding.

This invention was made in order to eliminate these drawbacks, and it is possible to start and stop reading by mistake (
It is an object of the present invention to provide a method for reading images.

[Means for solving problems]

The image reading method according to the present invention compares one input signal obtained by the image sensor for reading the characters/figures with the input signal 1)j once or multiple times, and detects a change at least twice (5 times). If not, it is assumed that the manual feed operation is stationary (1, the input signal is 1)
This is so that it is not used as a read signal for the IilI image.

[Effect]

In this invention, the image of the input signal is not read when the input signal obtained by the image sensor is small compared to the previous input signal or one or more times (in both cases, the input signal does not change more than once). do not have.

〔Example〕

FIGS. 1(a) and 1(b) are explanatory diagrams of the start of reading loss in this embodiment, and FIG. 1(a) shows that the image sensor 5 is moved in the hand-feeding direction, and the black pixel is It shows the state when it is first detected (1=10). 1st
FIG. 1(b) shows time t in FIG. 1(a). The input signal 9 of the image sensor 5 before and after is shown with respect to time tK, 8 is a flag indicating the image reading state, and this is 0.
NI71) #Read the image.

In the present invention, time t is the time when a black pixel is first detected in the input signal 9-1 of the input signals 9 of the image sensor 5. Thereafter, flag 8 is raised and image reading is started.

Next, the stopping of image reading according to the present invention will be explained with reference to FIGS. 2(a) and 2(b).

FIG. 2(a) shows a state in which the image sensor 5 is placed and stationary, at time t. Starts moving in the direction of arrow 1 at . FIG. 2(b) shows the input signal 9 of the image sensor 5 before and after time t0 versus time t.

Here, up to the input signal 9-4 of 1-1o, one scan (1
The input signal of the previous scan, for example 9-3, is the same as the input signal of one or more previous scans, for example 9-2. In this case, it is considered to be stationary, and flag 8 is OFF.
As a result, the image is not being read. At 1=1°, the input signals 9-4 and 9-3 are compared and since they have changed, it is detected that movement has started, and the flag 8 is raised to start reading the image.

Here, in the above-mentioned comparison of the main scans, it can be regarded as stationary because there is no change not only for one scan but also for several consecutive scans.

FIGS. 3(a) and 3(b) are other embodiments of the present invention,
The image is read by moving in the direction of arrow 7, and at time 1
=1. When the tuna is at rest and in the state shown in Figure 3 (a), 1) the input signals 9 of the front and rear image sensors 5 are
This is shown in b). Here, the input signal 9-5 of one scan of the image sensor 5 is compared with the input signal 9-4 of the previous one scan or multiple scans, and if they are exactly the same, it is assumed that it is stationary, and a flag is flagged. 8 to OFF to stop reading.

FIG. 4 shows an example of a circuit for carrying out the image reading method of the present invention. Here, 10 is a buffer into which the input signal from scanning is input, 1) is a comparator circuit and static state detection circuit that compares the input signal from scanning with the input signal from the previous scanning amount, 12 is a flip-flop, and 13 is a In this embodiment, the input signal of the image sensor 5 is input to the buffer 13 for one or more times, and furthermore, the input signal and the input signal from the previous run that has already entered the buffer 13 are input to the comparison circuit and Stationary state detection circuit 1
) to compare. As a result of the comparison, it tells the flip-flop 12 whether it is stationary or moving, and when it is stationary, it closes the gate 13 and does not input the read ID number, and when it is moving, it opens the gate 13. input the read signal.

In addition, when determining whether the image is stationary from a moving state, if the image has only white pixels (or black pixels) and does not change, it is not considered to be stationary. It is possible to prevent it from being considered stationary.

〔Effect of the invention〕

As described above, the present invention allows one input signal obtained by an image sensor to be sent one or more times to S
If the input signal does not change by at least 21ij1, the manual feed operation is considered to be stationary, and the input signal 4Ej is not used as an image reading signal. Even in a stationary state, there is no need to perform unnecessary readings, and the reading can be completed accurately.

[Brief explanation of the drawing]

1) 1(a) and 1(b) are explanatory diagrams of reading start in one embodiment of the present invention, FIG. 2 is an explanatory diagram of reading stop in embodiment 1 of this invention, and FIG. (
a). (b) is an explanatory diagram showing another embodiment of the present invention. In Figures 1 to 3, each (a) is a diagram showing the relationship between characters and the image sensor, each (b) is a diagram showing the input signal of the image sensor versus time, and Figure 4 - Ox -6+ is a +- Knoblock diagram of a circuit for implementing this invention, and FIG. 5 shows a conventional image reading method;
It is a figure for explaining. In the figure, 1 is the original, 2 is the text, and 3 is the V-lens optical system. 5 is an image sensor, 6 is a switch, T is an arrow, 8 is a flag, 9. 9-1. 9-2. 9-3.9-4゜9
-5 is an input signal. Figure 1 t. °゛8 FF Figure 2 Figure 3 OFF.

Claims (4)

[Claims] (1) In a system that reads characters, figures, etc. written on a document illuminated by a light source by hand-feeding, one input signal obtained by an image sensor that reads the characters and figures is read once or once. The image reading method is characterized in that the input signal is compared with the previous input signal a plurality of times, and if it has not changed at least twice, the manual feeding operation is considered to be stationary, and the input signal is not used as the image reading signal. Method. (2) If it is completely white or completely black except at the time of starting reading, it is assumed that a hand-feeding operation is being performed even if there is no change, and the input signal is used as a reading signal. ) Image reading method described in section. (3) Comparing one input signal of the image sensor with the previous input signal one or more times, and starting to read the image from the point at which the input signal first changes, using the input signal as a reading signal. An image reading method according to claim (1). (4) After starting image reading, one input signal is compared with the previous input signal one or more times, and if there is no change at least twice, image reading is terminated. An image reading method according to claim (1).