JPH0228895A - Mark reading system - Google Patents

Abstract

PURPOSE:To detect errors at high speed without deciding 'black stripes' generated by dust as normal marks by adding space lines for detecting the black stripes to a mark sheet and executing a black stripe detection processing in a mark detection processing. CONSTITUTION:Concerning lines (e1-e5) whose number of reading lines to detect a start mark 1 and a termination mark 2 in a main scanning direction of a specified number of times set in space lines C is a number Ne of effective lines which exceeds the specified number N of times, the position of a timing mark 3 and a mark width D are referred to and the black stripe is detected by whether there is black or not. That is to say, a little black stripe generated on the mark sheet like an L2 is not identified as an error since it does not influence an after mark line B. By making a black stripe detecting range within the mark width D, the black stripe which does not influence the mark line B like an L1 is not identified as an error and only the black stripe which influ ence the mark line B like an L3 is identified as an error.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mark reading method, and more particularly to a mark reading method for reading marks written on a document such as a facsimile machine.

[Conventional technology]

This type of conventional mark reading method uses a mark line with multiple mark entry fields between the start and end marks, and a timing mark that indicates the reading position in the main scanning direction and sub-scanning direction corresponding to this mark line. Use a mark sheet configured according to the timing of the mark detection processing device, or use a mark sheet with a mark entry field at the same position as the reading position in the main scanning direction and sub-scanning direction of the mark entry field stored in advance in the mark detection processing device. was used to detect the presence or absence of marks in the read signal and read the marks.

[Invention or problem to be solved]

In the conventional mark reading method described above, the mark sheet used is composed of mark entry fields and reading position marks in the main scanning direction and sub-scanning direction of each mark entry field, or is composed only of mark entry fields. , mark detection in each mark entry field was performed by identifying whether a mark was present or not based on the reading position in the main scanning direction and sub-scanning direction of the mark entry field stored inside the device, so an optical mark reading device was used. Therefore, when reading this sheet, dust attached to the lens or reflector of the device may cause the reading position in the main scanning direction of the mark entry field stored in the device to be the same as the mark written at the same position. If ``sushi'' occurs, the ``sushi'' occurs.
There is a drawback that all mark entry columns in which "black spots" occur are identified as having marks.

[Means to solve the problem]

The mark reading method of the present invention provides mark rows each having a plurality of mark entry fields in the main scanning direction at a plurality of locations.
The mark line at the location uses a mark sheet (which has a space line that prohibits the entry of marks), and a black signal exceeding the set value is detected from the space line read at the pre-stored mark line entry position. and a mark reading device that processes the read signal from the mark row as invalid only when the mark row is not detected.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a plan view of Marksee 1- used in one embodiment of the present invention, and 2t2I is a plan view of Marksee 1- for explaining the operation of this embodiment.

Marksees 1 to 1 shown in FIG. ] and end mark 2, there is a space line C that prohibits writing, and a timing line A that marks the reading direction in the main scanning direction.

The timing line A is for detecting the mark in the mark entry column 4 written in the mark line B.

The space line C is for detecting whether an unnecessary line (black line) is generated at the position of the timing mark 3 during mark reading.

Next, the black sushi detection process when using the mark sheet shown in FIG. 2 will be described. Prior to this black sushi detection process, the position of each timing mark in the main scanning direction and the mark width are detected and stored by detecting the timing row A.

Darkening is detected by referring to the stored timing mark position and mark width. For each line (el to e5) where the number of read lines in which the start mark 1 and end mark 2 in the main scanning direction are detected for the specified number N times set in the space line C exceeds the specified number N times and the number of effective lines Ne is The "black" detection of each 5° image line is performed by referring to the timing mark position and mark width that have already been detected and checking whether there is black. , identifies the reading line only within the mark width and detects "black".
That is, regarding the reading line e1, the black streak Pl is not detected, and the detected black streaks are P2 and P3. As mentioned above, "black" is detected from e1 to e5, and "black" is detected for each line.
"Black" detection position is memorized. When the stored "black" detection position exceeds the predetermined number of times Neb, it is determined that a black streak has occurred at that mark position, and a mark sheet reading error is determined.

That is, in Fig. 2, if the number of readings Ne is 5 lines and the specified value N e l: + is 4, a small black mark that occurs on a mark sheet such as L2 will not affect the subsequent mark line B, so it will be an error. Also, by setting the black stripe detection range within the timing width, black stripes that do not affect mark line B, such as black stripes Ll, are not identified as errors and are detected as black stripes L3. Only black lines that affect mark line B, such as , are identified as errors.

〔Effect of the invention〕

As explained above, the present invention adds a space line for detecting black streaks to a conventional mark sheet, and also performs black streak detection processing in the mark detection process, thereby making it easier to read the mark sheet with an optical mark reading device. Even if "black streaks" caused by dust attached to the lens or reflector occur in the same position as the mark field on the mark sheet, it is possible to detect errors quickly by processing them without determining them as genuine marks. effective.

In addition, when detecting "black sushi," the hanging position in the main scanning direction is limited to the same position as the mark entry field position, and only when "black" that continues over a certain width in the sub-scanning direction is detected, " By determining "black sushi", it is possible to detect only "black sushi" that is considered to affect the marked line.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a mark sheet used in an embodiment of the present invention, and FIG. 2 is a plan view of a mark sheet for explaining the operation of this embodiment. 1...Start mark, 2...End mark, 3...Timing mark, 4...Mark entry field, A...Timing line, B...Mark line, C...Space line.

Claims (1)

[Claims] A mark sheet with a plurality of mark rows provided with a plurality of mark entry columns in the main scanning direction is provided at a plurality of locations, and at least one of the mark rows is provided with a space row for prohibiting the entry of marks. and a mark reading device that processes the read signal from the mark line as invalid only when a black signal exceeding a set value is detected from the space line read at the writing position.