JPH02309865A - Picture reader - Google Patents

Abstract

PURPOSE:To omit a RAM for correction or a shift register for correction by preparing the memory areas in response to the positions of plural image sensors and correcting the address value of the image data to be compensated when the image data are written into or read out of those memory areas. CONSTITUTION:A correction circuit 64 corrects the address of the image data produced by an image sensor and to be compensated, and the picture memories 3 are prepared in response to plural image sensors respectively. Thus each memory (memory area) 3 stores the image data on each image sensor. In this case, the image data on the image sensor to be compensated undergoes the address correction related to the relevant storage when the image data on each image sensor is stored in each corresponding memory 3. Thus it is possible to obtain an inexpensive picture reading device which uses no shift register, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image reading device that is connected to a computer and operates as an image input device.

More specifically, the present invention relates to an image reading device using a light source and an image sensor that reads an image by detecting the level of reflected light emitted from the light source.

[Conventional technology]

2. Description of the Related Art Some image sensors that have recently been used in image reading devices include a plurality of image reading elements arranged in a straight line at equal intervals. This image sensor uses a light source (
It has a plurality of reading element arrays including an LED array (LED array) and a photodetecting element array such as a CCD, and is used in close contact with or in close proximity to the document to be read.

5 to 7 schematically show an integrated image reading device using this type of image sensor.

As shown in FIG. 5, the image sensor 2 is placed in close contact with or close to the original 1 to be read. The image sensor 2 has multiple image reading elements (N
) They are formed in a straight line in the X direction. By moving the original 1 by a predetermined amount in the Y direction and simultaneously operating each reading element of the image sensor 2, the image drawn on the original 1 can be read.

Image data read by the image sensor 2 shown in FIG. 5 is stored in the image memory 3 shown in FIG. 6. Writing the image data to the image memory 3 is as follows:
Writing is performed by the X-side address counter 41 and the Y-side address counter 42 based on the write clock (WTCLK) shown in FIG. On the other hand, image data from the image memory 3 is read out using a read clock (RDCLK) similar to the WTCLK described above.

Incidentally, in such an image reading device, its reading range depends on the reading range of the image sensor 2. For this reason, as shown in FIG. 2, there is a device in which a plurality of image sensors 2 of this type are arranged in the width direction. This device is
In order to eliminate breaks at the ends of the reading element rows of the image sensors 2, adjacent image sensors 2 are shifted by a distance d in the reading direction, that is, the Y direction. Now, consider an image reading device using two image sensors 2, as shown in FIG. Figure F drawn on manuscript 1 with this device
When read, the stored image F read by the first image sensor 21 is stored in the image memory 3 as shown in FIG.
1 and the stored image F2 read by the second image sensor 22 are stored with a difference of the arrangement interval d between the two image sensors 21 and 22. In this state, if these image data are output to an output device such as a display or a hard copy device, the images will be shifted by a distance d. Therefore, in such an apparatus, when reading image data from the image memory 3, the image data from the first image sensor 21 is outputted via the shift register 5, as shown in FIG. By doing this, the displacement of the stored image is compensated for.

[Problem that the invention seeks to solve]

As described above, a conventional image reading device having a plurality of image sensors requires a shift register. Third
Taking the image reading device shown in FIGS. and 4 as an example, the first
Assuming that the deviation d between the image sensor 21 and the second image sensor 22 is a deviation of L lines, an L×N stage shift register is required. Here, N is the number of reading elements of the image sensor 21.

In a normal device, this shift register would be huge and expensive.

The object of the present invention is to provide an inexpensive image reading device that does not use such a shift register or the like.

[Means for solving problems]

Therefore, in the present invention, an image memory having a memory area corresponding to each of a plurality of image sensors is provided, and a correction circuit is provided to correct the address of image data from the image sensor to be compensated.

[Effect]

Since it has an image memory corresponding to each position of a plurality of image sensors, image data for each image sensor is stored in each image memory (memory area).

When the image data from each image sensor is stored in the corresponding image memory, the address related to the storage of the image data in the image sensor to be compensated is corrected.

[Embodiment] FIG. 1 is an explanatory diagram showing one example of the main parts of an image reading device related to the present invention.

The image memory 3 has a first memory area 31 and a second memory area 32. This first memory area 31
For example, the image data read by the first image sensor 21 shown in FIG. 3 is stored in the memory area 32, and the image data of the second image sensor 22 is stored in the second memory area 32. ing.

The image data of the first image sensor 21 is sequentially stored at a predetermined address in the first memory area 31 by the first X side address counter 61, Y side address counter 63 and line correction circuit 64 under a write clock. be done. On the other hand, the image data of the second image sensor 22 is sequentially stored at a predetermined address in the second memory area 32 by the second X-side address counter 62 and Y-side address counter 63 under the same write clock. be done. 1st
The line correction circuit 64 for the image sensor 21 of
is to correct the deviation amount d (L line) between the first image sensor 21 and the second image sensor 22,
Regarding the image data read by the first image sensor 21, an amount corresponding to the shift amount is added to the address set by the Y-side address counter 63. Therefore, the stored images F stored in the image memory 3 are aligned and held in the first memory area 31 and the second memory area 32.

In this way, this device uses a method of correcting the Y-side address of the image data to be compensated.

On the other hand, when reading and outputting the stored image data, the line correction circuit 64 is not operated and the process is performed in the same manner as in the conventional device.By configuring it in this way, the circuit configuration can be extremely simplified. can.

In this embodiment, a configuration has been described in which the correction circuit 64 is operated when writing image data, but it is also possible to configure the correction circuit 64 to be operated during reading. That is, when writing image data, a sequential storage operation is performed as in the prior art. In the first memory area 31, image data from the first image sensor 21 is sequentially stored in the order in which they are read.
In the memory area 32 of 0, image data from the second image sensor 22 is sequentially stored in the order in which they are read.
In the image memory 3, between the stored image stored in the first memory area 31 and the stored image stored in the second memory area 32, there is a gap between the first image sensor 21 and the second image sensor 22. There is a shift that matches the shift amount d (L line). Therefore, when reading the image data in the image memory 3, the line correction circuit 64 may be operated to shift the reading start line of the image data stored in the first memory area 31 by the above amount.
The line correction circuit 64 may be configured to add an address amount matching the above to the address determined by the Y-side address counter 63.

〔Effect of the invention〕

As described above, according to the present invention, a memory area is provided corresponding to the positions of a plurality of image sensors, and when writing each image data to this memory area or reading each image data from this memory area, Since the address value of the image data to be compensated is corrected, a huge amount of correction RAM or a correction shift register can be made unnecessary, and an inexpensive image reading apparatus can be constructed.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the main parts of an image reading device according to an embodiment of the present invention, FIGS. 2 to 4 are explanatory diagrams of a conventional image reading device using a plurality of image sensors, and FIG. - FIG. 7 is an explanatory diagram of an image reading device using a monolithic image sensor. 1 - Manuscript 2 - Image sensor 3 - Image memory Patent applicant: Graphic Co., Ltd. No. IvJ Figure 2 14 - Figure output sewing

Claims (1)

[Claims] In an image reading device in which a plurality of image sensors are arranged offset from each other, a memory area corresponding to the positions of the plurality of image sensors is provided, and image data read by the plurality of image sensors is stored in the image reading device. A correction circuit is provided for correcting the write address or read address of the image data to compensate for the amount of deviation of the plurality of image sensors when storing the image data in each memory area or reading the stored image data. An image reading device characterized by: