JPH0623095Y2 - Image input device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an image input apparatus, and more particularly, by converting image information input by handwriting into an output signal in a raster scanning format, a counterpart apparatus via a transmission path. The present invention relates to an image input device that is applied to a facsimile device that reproduces an image that is transmitted and input.

[Conventional technology]

Conventionally, in this type of image input device, in a frame memory in which a capacity is secured corresponding to a preset fixed range including a range in which input is allowed, image information is expanded corresponding to input coordinates, After the handwriting input is completed, a method of performing raster scanning in a form similar to a certain range over the entire range of the frame memory is adopted.

FIG. 2 is a block diagram of an example of a conventional image input device.

In FIG. 2, the expansion circuit 2 writes the image information in the address position corresponding to the coordinates on the frame memory 3 based on the coordinate information 11 output from the coordinate detection circuit 1. When all the inputs are completed, the raster scanning circuit 4 performs raster scanning of the image information accumulated in the frame memory 3 over a fixed range including the inputtable range, and a scan output signal 12 '.
Is output.

[Problems to be solved by the invention]

In the above-described conventional image input device, the image input is not always performed over the entire inputtable range, and it is often sufficient to input only a part of the inputtable range.

However, since the conventional image input device performs raster scanning over the entire inputtable range even for such an input to only a part, raster scanning is unnecessarily performed for a part where no image is input. Thus, there is a drawback that extra communication time is spent when the facsimile transmission is used.

[Means for solving problems]

A coordinate detection circuit for detecting the coordinate information of the input point of the image information for each unit time interval by the image information including the image information and the coordinate information input from the handwriting input unit of the image orthogonal coordinates of the present invention, A frame memory having a capacity for at least the number of pixels within a coordinate range in which input is allowed, a development circuit for writing and developing the image information at an address position of the frame memory corresponding to the coordinate information, and a raster scan line. A storage circuit for storing the maximum value and the minimum value of the coordinate information corresponding to the start point and the end point of the frame memory, and the storage circuit if the currently input coordinate information is different from the coordinate information stored in the storage circuit. Of the coordinate information read from the storage circuit at the end of the input of the image information, and a comparison circuit for rewriting the stored content of the coordinate information to the input coordinate information. Configured to include a raster scanning circuit for outputting a scanning output signal performs raster scanning of the coordinate range recognized the image information stored in the frame memory only within the coordinate range by.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

In FIG. 1, the coordinate detection circuit 1 uses the image information 10 including the image information and the coordinate information 11 input from the rectangular coordinate handwriting input unit having a predetermined input range such as a tablet (not shown) for each unit time interval. The coordinates of the input point of the image information are detected and output as the coordinate information 11. The frame memory 3 has a memory capacity of at least the number of pixels within the coordinate range in which input is allowed. The expansion circuit 2 uses the coordinate information 11 output from the coordinate detection circuit 1 to generate the frame memory 3
Image information is written in the address position corresponding to the coordinate information 11 above.

On the other hand, the comparison circuit 5 receives the coordinate information 11 currently input.
And the maximum value and the minimum value information 13 of the coordinate information stored in the storage circuit 6 up to that time are compared to determine whether the coordinate information 11 is currently input. If the maximum or minimum value of the information is exceeded and the maximum or minimum value is reached, the currently input coordinate information 1
The stored content of the storage circuit 6 is rewritten with 1 being the maximum value or the minimum value.

When all the input is completed, the raster scanning circuit 4 reads the maximum value and the minimum value of the coordinate information input from the storage circuit 6, and the frame memory 3 is limited to the screen range limited by the maximum value and the minimum value. The accumulated image information is raster-scanned and a scan output signal 12 is output.

In this way, the raster scanning circuit 4 recognizes the input image range and limits the range to perform scanning, so that the transmission or coding process performed on the scan output signal 12 of the image information is conventionally performed. It can be completed within a short time compared to the other cases.

The comparison circuit 5 and the storage circuit 6 can be easily realized by an internal comparison function of a microprocessor that controls coordinate information to be developed in the frame memory 3 and a work area RAM used for the operation of the microprocessor.

[Effect of device]

As described above, the image input device of the present invention recognizes the effective range of the image information stored in the frame memory at the time of inputting the coordinate information, and performs raster scanning limited to the effective range to input the coordinate information. Since the scan output signal for the image information can be output within a short time, there is an effect that the processing time of the transmission or the encoding performed on the output signal can be shortened.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an example of a conventional image input device. DESCRIPTION OF SYMBOLS 1 ... Coordinate detection circuit, 2 ... Development circuit, 3 ... Frame memory, 4 ... Raster scanning circuit, 5 ... Comparison circuit, 6 ... Storage circuit, 10 ... Image information, 11 ... Coordinate information, 12, 12 '...
Scan output signal, 13 ... Maximum value and minimum value information.

Claims (1)

[Scope of utility model registration request] 1. A coordinate detection circuit for detecting the coordinate information of an input point of the image information at every unit time interval based on image information including image information and coordinate information input from a handwriting input unit of rectangular coordinates. A frame memory having a capacity of at least the number of pixels within a coordinate range in which input is allowed, a developing circuit for writing and developing the image information at an address position of the frame memory corresponding to the coordinate information, and a raster scan line. A storage circuit for storing the maximum value and the minimum value of the coordinate information corresponding to the start point and the end point of the frame memory,
When the coordinate information currently input is different from the coordinate information stored in the storage circuit, a comparison circuit that rewrites the storage content of the storage circuit to the input coordinate information, and the comparison circuit when the input of the image information is completed. A raster for recognizing the coordinate range based on the maximum value and the minimum value of the coordinate information read from the memory circuit, rasterizing the image information stored in the frame memory within the coordinate range, and outputting a scan output signal. An image input device comprising a scanning circuit.