JP2768001B2 - Image input device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to an image input device that obtains one scan image based on binary image data output from a plurality of photoelectric conversion units.

[Conventional technology]

2. Description of the Related Art Conventionally, when a single photoelectric conversion unit cannot provide a sufficient resolution or a visual field, a plurality of photoelectric conversion units scan one object to be scanned, and binary image data output from each photoelectric conversion unit is scanned. To obtain one continuous scanning image based on By the way, when obtaining one continuous scan image using a plurality of photoelectric conversion units, conventionally, binary image data output from each photoelectric conversion unit is stored in a separate page buffer, and after scanning, each binary image data is stored. The binary image data stored in the page buffer is read and joined.

[Problems to be solved by the invention]

Conventionally, as described above, since a page buffer had to be provided for each photoelectric conversion unit, there was a problem that the amount of memory was increased. Further, in the above-described conventional example, the joining process is performed after the scanning is completed.
There is a problem that the processing speed becomes slow.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image input device having a small amount of memory and a high processing speed.

[Means for solving the problem]

In order to achieve the above object, the present invention provides N photoelectric conversion units that scan an object to be scanned and output binary image data, wherein the photoelectric conversion units have a field of view on a straight line and are adjacent to each other. In an image input device which arranges a part of a field of view of a conversion unit so as to overlap and obtains one scan image based on binary image data output in parallel from each of the photoelectric conversion units, An image valid data gate unit provided for each image valid data gate unit for outputting only an effective part of the binary image data output from the corresponding photoelectric conversion unit; and a corresponding image valid data gate unit provided for each image valid data gate unit. A temporary storage unit into which a valid portion of the binary image data output from the data gate unit is input; an image data selection unit; and a page buffer, wherein each of the temporary storage units is one bit from the corresponding image valid data gate unit. Scanning By storing the effective portion of the binary image data, the effective portion of the binary image data for one scan added at a writing speed synchronized with the transfer speed of the binary image data is stored. The temporary storage unit corresponding to one end of the field of view of the previous one holds the binary image data for the previous one scan held by adding the effective part of the binary image data for one scan from the corresponding image valid data gate unit. The effective portion is read out at a read speed N times the write speed, and the other temporary storage portion is held by the self-temporary storage portion when the reading of the temporary storage portion on the one end side of the adjacent temporary storage portion is completed. The effective portion of the previous binary image data for one scan is read at a read speed N times the writing speed, and the image data selection unit reads the binary image data from each of the temporary storage units. Select a temporary storage unit that rope, and a significant part of the binary image data being read from the selected temporary storage unit to sequentially written in the page buffer.

(Operation)

The binary image data output from the N photoelectric conversion units is added to the corresponding temporary storage unit via the corresponding image effective data gate unit. Since a part of the field of view of the photoelectric conversion unit adjacent to the N photoelectric conversion units overlaps and there is an unnecessary part to obtain one continuous scanning image, the image effective data gate unit has the corresponding photoelectric conversion unit. Among the binary image data output from the conversion unit, the binary image data corresponding to the field of view only included in the corresponding photoelectric conversion unit and the field of view overlapping with the field of view of the photoelectric conversion unit corresponding to the adjacent image effective data gate unit. The adjacent image effective data gate unit outputs only binary image data corresponding to a portion that does not output binary image data, and outputs only the effective portion of the binary image data added from the corresponding photoelectric conversion unit. Output.

Among the temporary storage units, the temporary storage unit corresponding to one end of the field of view stores the effective portion of the binary image data for one scan from the corresponding image effective data gate unit, and transfers it to the transfer speed of the binary image data. And the effective portion of the binary image data before one scan stored at a read speed N times the write speed is read. Further, when the effective portion of the binary image data for one scan is added from the corresponding image effective data gate unit, the other temporary storage unit stores the effective portion at a writing speed synchronized with the transfer speed of the binary image data, When the reading of the temporary storage section on the one end side of the adjacent temporary storage section is completed, the effective portion of the binary image data before one scan stored in the temporary storage section is read.

The image data selection unit selects the temporary storage unit from which the binary image data is read out of each temporary storage unit, and pages the valid portion of the binary image data read from the selected temporary storage unit. Write sequentially to the buffer.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which two photoelectric conversion units 1, 4 for scanning a scanned object and outputting binary image data, and output from the photoelectric conversion units 1, 4 Image effective data gate that outputs only the effective part of the binary image data
2, a temporary storage unit 3 composed of line buffers 3a and 3b, a line buffer write control unit 3c, and a line buffer read control unit 3d as shown in FIG. The temporary storage unit 6 includes buffers 6a and 6b, a line buffer write control unit 6c, and a line buffer read control unit 6d, and output from the line buffers 3a, 3b, 6a and 6b in the temporary storage units 3 and 6. An image data selection unit 7 for selecting one of the binary image data, an image data selection control unit 9 for controlling the image data selection unit 7, and a page buffer 8.

FIG. 3 is a view showing the fields of view (scanning portions) 10 and 11 of the photoelectric conversion units 1 and 4, and the fields of view 10 and 11 are on a straight line, and some of them overlap. The number of meshes in the field of view 10 of the photoelectric conversion unit 1 is k, the number of meshes in the field of view 11 of the photoelectric conversion unit 4 is z, and the fields of view 10, 1
The number of meshes in the overlapping portion of 1 is n.
Further, in the present embodiment, the effective visual field range of the visual field 10 of the photoelectric conversion unit 1 is a range of 1 mesh from the left end of the visual field 10.
However, the number of meshes 1 is determined so that the right end of the effective visual field range of the visual field 10 overlaps the overlapping portion of the visual fields 10 and 11. Accordingly, the invalid visual field range of the visual field 10 of the photoelectric conversion unit 1 is a range of m meshes from the right end of the visual field 10, and the invalid visual field range of the visual field 11 of the photoelectric conversion unit 4 is x meshes (x = n) from the left end of the visual field 11. −m), and the effective visual field range of the visual field 11 is a range of y mesh between a point advanced by x mesh from the left end of the visual field 11 and the right end of the visual field 11.

The image effective data gate 2 to which the binary image data from the photoelectric conversion unit 1 is added has a field of view of the photoelectric conversion unit 1 described above.
The number of meshes 1 in the effective visual field range of 10 is set as a limit value, and the image effective data gate unit 2 has 1 mesh from the beginning of the binary image data for one scan added from the photoelectric conversion unit 1. Only binary image data is output as an effective part. Further, the mesh number x of the invalid visual field range of the photoelectric conversion unit 4 is set in the image effective data gate unit 5 to which the binary image data from the photoelectric conversion unit 4 is added. Of the binary image data for one scan added from the photoelectric conversion unit 4, the one obtained by removing binary image data for x mesh from the head is output as an effective part.

FIG. 4 is a diagram for explaining the operation of this embodiment, and the operation of this embodiment will be described below with reference to the drawings.

The photoelectric conversion units 1 and 4 start scanning at the same timing and output binary image data. The image valid data gate unit 2 outputs only one mesh of binary image data from the head of the binary image data for one scan output from the photoelectric conversion unit 1 as an effective part. Further, the image effective data gate unit 5 outputs, as an effective part, the binary image data for one scan output from the photoelectric conversion unit 4 from which binary image data for x mesh is removed from the head.

The valid portions of the binary image data output from the image valid data gate units 2 and 5 are added to the temporary storage units 3 and 6, respectively. When the valid part of the binary image data is sent from the image valid data gate units 2 and 5, the line buffer write control unit 3 in the temporary storage units 3 and 6, as shown in FIG.
c and 6c write the effective portion of the two-time image data sent in synchronization with the transfer timing to the line buffers 3a and 6a, and the line buffer read control unit 3d performs one scan stored in the line buffer 3b. The effective portion of the previous binary image data is read at a read speed twice as fast as the write speed. Further, the image data selection control section 9 controls the image data selection section 7 to transfer the read data of the line buffer 3b to the page buffer 8. The page buffer 8 sequentially stores the binary image data transferred from the image data selection unit 7. Here, since the reading speed is twice the writing speed, the reading for one scan is completed in half the time of the writing operation.

When the reading of the line buffer 3b is completed, as shown in FIG. 4 (b), the line buffer read control unit 6d in the temporary storage unit 6 reads the binary image data of one scan before written in the line buffer 6b. The effective portion is read at twice the reading speed of the writing speed, and the image data selection control unit 9 controls the image data selection unit 7 to control the line buffer 6b.
Is transferred to the page buffer 8. The page buffer 8 sequentially stores the binary image data transferred from the image data selection unit 7. When the reading of the line buffer 6b ends, the writing of the line buffers 3a and 6a also ends.

Here, the effective portion of the binary image data before one scan obtained by the photoelectric conversion unit 1 is stored in the line buffer 3b, and the binary image data before one scan obtained by the photoelectric conversion unit 4 is stored in the line buffer 6b. Since the valid part of is stored,
As described above, after the line buffer 3b is read, the line buffer 6b is read, and the read data of the line buffers 3b, 6b are sequentially transferred to the page buffer 8b.
, The binary image data for one scan divided into two by the photoelectric conversion units 1 and 4 is written to the page buffer 8 in a joined form.

Thereafter, when the photoelectric conversion units 1 and 4 output binary image data for the next one scan, the image valid data gate units 2 and 5 output only the valid part of the binary image data in the same manner as described above.

When the effective portion of the binary image data for the next one scan is added through the image effective data gates 2 and 5, as shown in FIG. The write control units 3c and 6c synchronize the effective portion of the added binary image data with the line buffers 3b and 6
b, the line buffer read control unit 3d reads the effective portion of the binary image data before one scan stored in the line buffer 3a at a read speed twice as fast as the write speed. The image data selection control unit 9 controls the image data selection unit 7 to transfer the output data of the line buffer 3a to the page buffer 8, and the page buffer 8 synchronizes the transferred binary image data with the transfer speed. And store them sequentially.

When reading of the line buffer 3a for one scan is completed, as shown in FIG. 4 (d), the line buffer read control unit 6d in the temporary storage unit 6 stores the two lines before the one scan stored in the line buffer 6a. The valid part of the value image data is read at a read speed twice as fast as the write speed, and the image data selection control unit 9 controls the image data selection unit 7 to transfer the output data of the line buffer 6a to the page buffer 8.

Thereafter, every time binary image data for one scan is output from the photoelectric conversion units 1, 4, the same operation as described above is performed, and the binary image data corresponding to one continuous scan image is stored in the page buffer 8. Is stored.

〔The invention's effect〕

As described above, according to the present invention, an image effective data gate unit that outputs only an effective portion of binary image data output from N photoelectric conversion units is provided for each photoelectric conversion unit. By providing a temporary storage unit for temporarily storing an effective portion of the binary image data corresponding to the gate unit, and outputting an effective portion of the binary image data for the next one scan from each image effective data gate unit, Since the effective portion of the binary image data before one scan stored in each temporary storage unit is sequentially read from the end temporary storage unit at a read speed N times the writing speed, each temporary storage unit is used. The binary image data sequentially read from the units is obtained by joining the binary image data divided by the N photoelectric conversion units. Therefore, according to the present invention, as in the conventional example,
Since there is no need to provide a page buffer for each photoelectric conversion unit, there is an effect that the amount of memory can be reduced, and binary image data divided by a plurality of photoelectric conversion units can be simultaneously scanned. Since it is obtained as continuous image data, there is an effect that the processing speed can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram showing a configuration example of temporary storage units 3 and 6, FIG. 3 is a diagram showing a field of view of photoelectric conversion units 1 and 4, and FIG. The figure is a diagram for explaining the operation of the embodiment. In the figure, 1,4 ... photoelectric conversion unit, 2,5 ... image effective data gate unit, 3,6 ... temporary storage unit, 3a, 3b, 6a, 6b ... line buffer, 3c, 6c ... ... Line buffer write control unit, 3d, 6d ... Line buffer read control unit, 7 ...
Image data selection unit 8, page buffer 9, image data selection control unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04N 1/04 G06T 1/00

Claims (3)

(57) [Claims] 1. A method according to claim 1, wherein N photoelectric conversion units for scanning the object to be scanned and outputting binary image data are arranged such that the field of view of each of the photoelectric conversion units is on a straight line and the field of view of an adjacent photoelectric conversion unit is In an image input device arranged to partially overlap and obtain one scan image based on binary image data output in parallel from each of the photoelectric conversion units, provided for each of the photoelectric conversion units, An image effective data gate unit that outputs only an effective portion of the binary image data output from the corresponding photoelectric conversion unit; and an image effective data gate unit provided for each image effective data gate unit and output from the corresponding image effective data gate unit. A temporary storage unit into which an effective part of the binary image data to be input is input; an image data selection unit; and a page buffer, wherein each of the temporary storage units is a binary for one scan from a corresponding image effective data gate unit. With image data By adding the portion, the effective portion of the binary image data for one scan added at the writing speed synchronized with the transfer speed of the binary image data is stored, and corresponds to one end of the field of view in each of the temporary storage portions. The temporary storage unit that stores the data from the corresponding image valid data gate unit
The effective portion of the binary image data for the previous one scan held by adding the effective portion of the binary image data for the scan is read out at a read speed N times the write speed, and the other temporary storage unit is When reading of the temporary storage unit on the one end side of the adjacent temporary storage units is completed, the effective portion of the binary image data for the previous one scan held by the local temporary storage unit is N times the writing speed. The image data selecting unit selects a temporary storage unit from which the binary image data is read out of the respective temporary storage units, and reads out the temporary storage unit from the selected temporary storage unit. An image input device for sequentially writing effective portions of value image data into the page buffer. 2. The image effective data gate section includes: binary image data corresponding to a visual field included in only the corresponding photoelectric conversion section, among binary image data output from the corresponding photoelectric conversion section;
Outputting binary image data corresponding to a portion where the adjacent image valid data gate section does not output binary image data in a field of view overlapping with the field of view of the photoelectric conversion section corresponding to the adjacent image valid data gate section. The image input device according to claim 1, wherein: 3. A temporary storage unit corresponding to one end of a field of view of each of the temporary storage units stores two line buffers and an effective portion of binary image data output from a corresponding image effective data gate unit. A line buffer write control unit that writes data to two line buffers alternately by one scan at a write speed synchronized with a transfer speed of binary image data, and a binary image data for one scan from a corresponding image valid data gate unit By adding the valid part, 2 in the temporary storage
A line buffer read control unit for reading out the effective portion of the binary image data stored in the line buffer which is not currently writing out of the line buffers at a read speed of N times the write speed; The storage unit stores two line buffers and the effective portion of the binary image data output from the corresponding image effective data gate unit in the two line buffers alternately for one scan, thereby transferring the binary image data. A line buffer write control unit that writes at a write speed synchronized with
When the reading of the data from the temporary storage unit on the one end side of the adjacent temporary storage unit is completed, the data is stored in the line buffer to which the current writing is not performed among the two line buffers in the own temporary storage unit. 3. The image input device according to claim 1, further comprising a line buffer read control unit for reading an effective portion of the binary image data at a read speed N times the write speed.