JPH05145701A - Image input device - Google Patents

Abstract

PURPOSE:To provide an image input device which can prevent the deterioration of picture quality of the input image data that is caused by the errors of transmission. CONSTITUTION:A framing data generating part 11 of a hand scanner 1 writes the transmitted image data into a memory 18 after giving an address to the data and transmits this data via a framing part 12, a modulating part 13, and a light emitting part 14. A modulating part 25 of an image input device main body 2 modulates again the image data received by a light receiving part 21 and demodulated by a demodulating part 22 and transmits this data through a light transmitting part 24. A deframing deciding part 17 of the hand scanner 1 compares the image data received by a light receiving part 15 and demodulated by a demodulating part 16 with the image data stored in the memory 18 that has the same address 55 the former image data. When the coincidence is obtained between both image data, the image data stored in the memory 18 is erased. The part 11 transmits again the image data remaining in the memory 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input device having a cordless hand scanner, and more particularly to improving the quality of input images.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, in an image input apparatus having a hand scanner, a hand scanner 1 is connected to an image input apparatus main body 2 (sometimes simply referred to as main body 2) via a cord 3. Have a configuration. In such a conventional image input device, the movement range of the hand scanner 1 is restricted by the length of the cord 3, and when the hand scanner 1 is moved in the sub operation direction (arrow direction),
It may be pulled by the cord 3, and the movement posture thereof may become unstable as shown in (a), causing a problem such as tilting.

In order to solve such a problem, an image input apparatus having a cordless hand scanner which abolishes the cord 3 and connects the hand scanner 1 and the main body by using a wireless transmission line has been developed. However, when the hand scanner 1 and the main body 2 are connected to each other by using, for example, an infrared wireless transmission line in this way, the hand scanner 1 is affected by a fluorescent lamp or external light and is read by the hand scanner 1 for reading.
While moving up, an error occurs in the image data wirelessly transmitted from the hand scanner 1 to the main body 2 due to a change in the amount of light received by the infrared light receiving element provided on the main body 2 side or a change in the signal incident angle. However, there is a drawback that the image quality deteriorates. Further, when the hand scanner 1 and the main body 2 are connected by a wireless transmission line using radio waves, a data error occurs when the main body 2 is received by another radio wave existing on this transmission line,
Similarly, there is a drawback that the quality of the input image is deteriorated.

[0004]

In the image input apparatus having the cordless hand scanner as described above, since the hand scanner and the main body are connected by the wireless transmission line, various disturbances on the wireless transmission line may cause a problem. There is a high possibility that an error will occur when the main body receives the image data transmitted from the hand scanner. Therefore, this type of image input device has a drawback in that the image quality of the image data input to the main body is deteriorated as compared with that using a code.

Therefore, the present invention eliminates the above-mentioned drawbacks, and an object of the present invention is to provide an image input device capable of preventing deterioration of the image quality of input image data due to a transmission error.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a hand scanner and an apparatus main body for processing image data read by the hand scanner are connected to each other via a wireless transmission path. 1 transmitting / receiving means, storage means for holding image data to be transmitted to the main body by the first transmitting / receiving means, image data returned from the main body by the transmitting / receiving means and image data in the storage means. And a resending unit for resending the image data in the storage unit from the first sending / receiving unit to the main body when the both image data do not match by this judging unit. A second transmission / reception unit provided on the side of the hand scanner and transmitting / receiving image data, and a hand scan received by the second transmission / reception unit. Having a structure in which a data return means for transmitting the image data transmitted from the catcher Na to the hand scanner by the second transceiver means on the apparatus body side.

As a configuration different from the above configuration, an image input device in which a hand scanner and an apparatus main body for processing image data read by the hand scanner are connected via a wireless transmission line 1
Transmission / reception means, storage means for holding image data to be transmitted to the main body by the first transmission / reception means, and specific data and error for specifying the image data in the image data to be transmitted to the main body by the first transmission / reception means. A data adding unit for adding detection data and a resending unit for resending the image data in the storage unit corresponding to the specific data returned from the main body by the sending / receiving unit to the main unit from the first sending / receiving unit. Whether or not an error has occurred in the received image data due to the second transmitting / receiving means provided on the scanner side and transmitting / receiving the image data, and the error detection data added to the image data received from the hand scanner by the second transmitting / receiving means. Error determination means for determining whether or not the received image data determined to have an error by this error determination means By the second transceiver means specific data having a structure in which the apparatus main body and the specific data return means for transmitting to the hand scanner.

As a structure different from the above structure, in an image input device in which a hand scanner and a device body for processing image data read by the hand scanner are connected via a wireless transmission line, error correction of the image data is performed. An encoding means for encoding and a transmitting means for transmitting the image data error-correction-encoded by the encoding means are provided on the hand scanner side, and the error-correction-encoded image transmitted from the transmitting means. The apparatus has a configuration in which a receiving unit that receives data and a decoding unit that decodes the error correction coded image data received by the receiving unit are provided on the apparatus main body side.

[0009]

In the image input apparatus of the present invention, the first transmitting / receiving means on the hand scanner side transmits / receives image data. The storage means holds the image data transmitted to the main body by the first transmission / reception means. The determination means determines whether or not the image data returned from the main body received by the transmission / reception means matches the image data in the storage means.
The resending unit resends the image data in the storage unit from the first sending / receiving unit to the main body when the determination unit determines that the two image data do not match. The second transmission / reception means on the apparatus body side transmits / receives image data. The data returning means transmits the image data transmitted from the hand scanner received by the second transmitting / receiving means to the hand scanner by the second transmitting / receiving means.

In the image input apparatus having an operation different from the above operation, the first transmitting / receiving means on the hand scanner side transmits / receives image data. The storage means holds the image data transmitted to the main body by the first transmission / reception means.
The data adding means adds the specific data for specifying the image data and the error detection data to the image data transmitted to the main body by the first transmitting / receiving means. The resending unit resends the image data in the storage unit corresponding to the specific data returned from the main body received by the sending / receiving unit from the first sending / receiving unit to the main unit. The second transmission / reception means on the apparatus body side transmits / receives image data. The error determination means determines whether or not an error has occurred in the received image data based on the error detection data added to the image data received from the hand scanner by the second transmission / reception means. The specific data returning means specifies the specific data for specifying the received image data which is determined to have an error by the error determining means as the second data.
Is transmitted to the hand scanner by the transmission / reception means of.

In the image input device having a function other than the above, the coding means on the hand scanner side performs error correction coding on the image data. The transmission means transmits the image data that has been error-correction coded by the coding means.
The receiving means on the apparatus body side receives the error correction coded image data transmitted from the transmitting means. The decoding means decodes the error-correction-coded image data received by the receiving means.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the image input device of the present invention. Reference numeral 1 is a hand scanner, and 2 is a main body of the image input device. The hand scanner 1 and the image input device body 2 are connected by a wireless transmission path. Reference numeral 11 denotes a framing data generation unit that adds an address for identifying image data read by a contact sensor (not shown), and 12
Is a framing unit that frames input image data as shown in FIG. 7, 13 is a modulation unit that modulates the framed image data, 14 is a light emitting unit that emits infrared light in accordance with an input modulation signal, Reference numeral 15 is a light receiving section for receiving the modulated infrared rays, 16 is a demodulation section for demodulating the input modulation data, and 17 is a section for returning the input framed image data to the original raw image data and storing it in the memory 18. The deframing determination unit for comparing with the image data of No. 1 is a memory for storing the image data to be transmitted. Reference numeral 21 is a light receiving portion for receiving the modulated infrared image data, 22 is a demodulating portion for demodulating the modulated image data, 23 is a modulating portion for modulating the input data, and 24 is a light emitting portion for emitting infrared light corresponding to the input modulated data. , 25 are deframing units for returning the framed image data to the original image data.

Next, the operation of this embodiment will be described. When the hand scanner 1 is moved along a document (not shown), a contact sensor unit (not shown) reads characters and figures on the document to form image data. A unique address is added to the image data 50 by the framing data generator 11, and the image data 50 is stored in the memory 18 together with this address. On the other hand, the framing unit 12 frames the image data added with the address, which is input from the framing data generation unit 11, as shown in FIG. The framed image data is modulated by the modulator 13 and then sent to the light emitting unit 14. The light emitting unit 14 emits infrared rays c corresponding to the input modulated framed image data to the main body 2 side. Here, the framed image data shown in FIG. 7 will be described. A flag (FLG) is attached to the head of the frame to indicate that this is the first part of the frame. Next to this FLG, an address (ADR) that identifies the image data in this frame
Is added, and the image data (DAT) is entered after that. After this DAT, a flag (FLG) indicating the end of the frame is attached. That is, the image data DAT is converted by the framing unit 12 shown in FIG. 1 into framed image data as shown in FIG.

The light receiving section 21 of the main body 2 receives the infrared rays c emitted from the hand scanner 1 to form modulated framed image data, and then outputs this to the demodulation section 22. The demodulation section 22 demodulates the modulated framed image data into framed image data, and outputs this to the deframing section 25 and the modulation section 23. The modulator 23 modulates the input framed image data and then outputs it to the light emitting unit 24. The light emitting unit 24 emits infrared rays d corresponding to the input modulated framed image data to the hand scanner 1 side. On the other hand, the deframing unit 25 returns the input framed image data to the original image data and outputs it to the next stage (not shown).

The light receiving section 15 of the hand scanner 1 receives the infrared rays d emitted from the main body 2 side to form modulated framed image data, and outputs this to the demodulating section 16. Demodulator 16
Demodulates the input modulated framed image data into framed image data, which is used by the deframing determination unit 1
Output to 7. The deframing determination unit 17 restores the input framed image data to the original image data, searches the memory 18 based on the obtained address, reads the image data at the same address as this address, and reads it. The image data is compared with the input image data. As a result, when the two match, the deframing determination unit 17 determines that the memory 1
The corresponding image data of 8 is deleted. However, if the comparison result shows that the two image data do not match, the deframing determination unit 17 leaves the corresponding image data in the memory 18 and leaves it as it is. The above operation is performed for each image data read by the hand scanner 1, and after all the image data are transmitted, the framing data generation unit 11 causes the memory 1
8 is searched, the image data written therein is read, and output to the framing unit 12. As a result, the read image data is framed again and then retransmitted to the main body 2 side via the modulator 13 and the light emitter 14. Since the above-described processing is performed also in the retransmission of this image data, the framing data generation unit 11
Performs the above retransmitting process until the image data stored in the memory 18 is exhausted.

According to this embodiment, the image data transmitted from the hand scanner 1 to the main body 2 side is retransmitted from the main body 2 side and returned to the hand scanner 1 side. When the returned image data does not match, the image data is retransmitted from the hand scanner 1 side to the main body 2 side until the both image data match, so that the main body 2 side ends up with error-free image data. Can be received, and even if it is cordless, it is possible to prevent deterioration of the quality of the read image data and obtain the image data of a predetermined level or higher.

FIG. 2 is a block diagram showing another embodiment of the present invention. This example is different from the previous example shown in FIG. 1 in that the framed image data transmitted and received between the hand scanner 1 and the image reading apparatus main body 2 is performed using radio waves. Therefore, the radio wave transmission unit 8 of the hand scanner 1 transmits a radio wave corresponding to the modulated framed image data input from the modulation unit 13 to the main body 2 side. The radio wave receiving unit 28 on the main body 2 side receives the modulated framed image data transmitted from the hand scanner 1, and demodulates the modulated framed image data.
Demodulate at. Also, regarding the return image data transmitted from the main body 2 side to the hand scanner 1 side, the radio wave transmission unit 29 of the main body 2 side is also transmitted to the hand scanner 1 side, and the transmitted image data is the radio wave of the hand scanner 1 side. It is received by the receiving unit 7. Other configurations and operations are the same as those of the previous embodiment shown in FIG. 1 and have similar effects.

FIG. 3 is a block diagram showing another embodiment of the present invention. In this example, CRC (Cyclic Redun) of the received image data deframed on the image input device main body 2 side is used.
dan-cy Check) is provided to determine whether or not an error has occurred in the received image data, and a framing unit 27 for framing the image data. Further, unlike the previous embodiment, the framing unit 11 on the hand scanner 1 side has an HDLC (High I
evel Data Link Control Procedure) The image data is framed as shown in FIG. Further, the hand scanner 1 includes a deframing unit 19 that deframes the returned framed image data demodulated by the demodulation unit 16 and a reproduction data management unit that holds an address obtained by the deframing unit 19.
It is provided on the side. The other structure is similar to that of the previous embodiment.

Image data 50 read from a document or the like
The framing data generator 11 adds an address for specifying the image data and stores it in the memory 18 together with this address. Thereafter, the image data is framed by the framing unit 12 in the HDLC structure as shown in FIG.
Send to the side. The main body 2 side receives the framed image data sent from the hand scanner 1 side by the light receiving unit 21, demodulates it by the demodulation unit 22, and inputs the obtained framed image data to the deframing unit 25. The deframing unit 25 restores the input framed image data to the original image data, and at this time, sends the obtained CRC to the determination address recognition unit 26 to cause error detection. As a result, if there is no error, the deframing unit 25 sends the restored image data to a subsequent stage (not shown). On the other hand, when the determination address recognition unit 26 determines that there is an error, the deframing unit 25 does not send the restored image data to the latter stage, but instead sends the address specifying the image data to the framing unit 27. Output.

As a result, the framing unit 27 frames the input address and sends it to the modulator 23.
The modulator 23 modulates the input framed address and transmits it from the light emitter 24 to the hand scanner 1 side. Here, the framing unit 27 uses the address as shown in FIG.
As shown in (1), the framed data is transmitted to the hand scanner 1 side several times in succession, thereby preventing a reception error of this data on the hand scanner 1 side. Incidentally, No in the frame of FIG. 9 is the number of the data returned to the scanner 1 side. The framed address received by the light receiving unit 13 on the side of the hand scanner 1 is demodulated by the demodulating unit 16, restored to the original data by the deframing unit 17, and then sent to the retransmission data managing unit 20. .. The retransmitted data management unit 20 checks the CRC of the data transmitted several times as described above every time it is transmitted, and holds the address of the data having no reception error. Once all the read image data 50 has been transmitted, the framing data generation unit 11 reads the address held in the retransmission data management unit 20, reads the image data specified by this address from the memory 18, and then the framing unit. By outputting to 12, the data is retransmitted to the main body 2 side. After all, the framing data generator 1
In No. 1, the resending is performed until there are no addresses held in the resending data management unit 12, while the main body 2 side also repeats the above-described operation for the resent image data.

In the present embodiment, H from the hand scanner 1 side.
Since the framed image data having the DLC structure is sent, an error in the framed image data received by the main body 2 side can be detected, and only the address for specifying the image data in which this error has occurred is detected by the hand scanner 1 side. Therefore, it is not necessary to send all the image data received by the main body 2 side to the hand scanner 1 side as in the previous embodiment because the image data is sent to the hand scanner 1 again and the corresponding image data is resent.
Since the amount of data communication between the main scanner 2 and the main body 2 can be reduced, the power consumption of the hand scanner 1 and the main body 2 can be reduced as compared with the previous embodiment. As a result, the driving time by the battery on the hand scanner 1 side can be lengthened. Of course, also in this example, the image data finally received on the main body 2 side has no error, and high-quality image data can be obtained.

FIG. 4 is a block diagram showing still another embodiment of the present invention. This example differs from the previous example shown in FIG. 3 in that image data transmitted and received between the hand scanner 1 and the image reading apparatus main body 2 is performed using radio waves. Therefore, in this example, the radio wave transmitter 8 and the radio wave receiver 7 are provided on the hand scanner 1 side, and the radio wave receiver 2 is provided on the main body 2 side.
8 and a radio wave transmitter 29 are provided. Other configurations and operations are the same as those of the previous embodiment shown in FIG. 3 and have similar effects.

FIG. 5 is a block diagram showing still another embodiment of the present invention. Image data read from a document or the like is error-correction-encoded by the error-correction encoder 9 of the hand scanner 1, modulated by the modulator 13, and further emitted from the light-emitting unit 14 to the image input apparatus body 2 side. It Body 2
The light receiving unit 21 on the side receives the image data transmitted from the side of the hand scanner 1 and sends it to the demodulating unit 22 to demodulate it. At this time, the error correction decoder 30 decodes the demodulated error correction coded image data so that if the received image data has an error, the error correction decoder 30 restores the corrected image data to correct image data and sends it to a subsequent stage (not shown). Output. In this example, by correcting the reception error of the image data transmitted from the hand scanner 1 side as described above, it is possible to correct the error of a considerable portion of the image data at the time of reception and send it to the subsequent stage. Therefore, the quality of the read image data can be set to a level that is not a practical problem. Moreover, in the present embodiment, a one-way transmission system without a transmission path for transmitting data from the main body 2 side to the hand scanner 1 side as in the above embodiment is sufficient, so the number of parts of the device can be reduced and the cost can be reduced. In addition, the power consumption of the hand scanner 1 and the main body 2 can be significantly reduced.

FIG. 6 is a block diagram showing still another embodiment of the present invention. This example is different from the previous example shown in FIG. 5 in that the image data transmitted and received between the hand scanner 1 and the image reading apparatus main body 2 is performed using radio waves. Therefore, in this example, the radio wave transmitter 8 is provided on the side of the hand scanner 1 and the radio wave receiver 28 is provided on the side of the main body 2. Other configurations and operations are the same as those of the previous embodiment shown in FIG. 5, and have similar effects.

[0025]

As described above, according to the image input device of the present invention, it is possible to prevent the deterioration of the image quality of the input image data due to the transmission error.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an image input device of the present invention.

FIG. 2 is a block diagram showing another embodiment of the present invention.

FIG. 3 is a block diagram showing still another embodiment of the present invention.

FIG. 4 is a block diagram showing still another embodiment of the present invention.

FIG. 5 is a block diagram showing still another embodiment of the present invention.

FIG. 6 is a block diagram showing still another embodiment of the present invention.

7 is a diagram showing an example of image data framed by the hand scanner shown in FIG.

8 is a diagram showing an example of image data framed by the hand scanner shown in FIG.

9 is a diagram showing an example of data framed by the image input device body shown in FIG.

FIG. 10 is a block diagram showing an example of a conventional image input device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hand scanner 2 ... Image input device main body 7, 28 ... Radio wave reception part 8, 29 ... Radio wave transmission part 11 ... Framing data generation part 12, 27 ... Framing part 13, 23 ... Modulation part 14, 24 ... Light emission part 15, 21 ... Light receiving part 16, 22 ... Demodulation part 17 ... Deframing determination part 18 ... Memory 19, 25 ... Deframing part 20 ... Retransmission data management part 26 ... Judgment address recognition part

Claims (3)

[Claims] 1. An image input device in which a hand scanner and an apparatus main body for processing image data read by the hand scanner are connected via a wireless transmission path, and a first transmitting / receiving unit for transmitting / receiving image data, and It is determined whether or not the storage means for holding the image data to be transmitted to the main body by the first transmission / reception means and the image data returned from the main body by the transmission / reception means and the image data in the storage means match each other. If the determination means to perform and the two image data by this determination means do not match,
A retransmitting means for retransmitting the image data in the storage means from the first transmitting / receiving means to the main body is provided on the side of the hand scanner, and a second transmitting / receiving means for transmitting / receiving the image data, and the second transmitting / receiving means. An image input device, comprising: a data returning unit for transmitting the received image data transmitted from the hand scanner to the hand scanner by the second transmitting / receiving unit. 2. An image input device in which a hand scanner and an apparatus main body for processing image data read by the hand scanner are connected via a wireless transmission path, and first transmitting / receiving means for transmitting / receiving image data, and Storage means for holding image data to be transmitted to the main body by the first transmission / reception means, and data for adding specific data for specifying the image data and error detection data to the image data to be transmitted to the main body by the first transmission / reception means The hand scanner side is provided with an adding means and a retransmitting means for retransmitting the image data in the storage means corresponding to the specific data received by the transmitting and receiving means and returned from the main body from the first transmitting and receiving means to the main body. , A second transmitting / receiving means for transmitting / receiving image data, and receiving from the hand scanner by the second transmitting / receiving means Error determining means for determining whether or not an error has occurred in the received image data based on the error detection data added to the image data, and specific data for specifying the received image data in which the error determining means determines that an error has occurred. An image input device, characterized in that a specific data return means for transmitting to the hand scanner by the second transmission / reception means is provided on the apparatus main body side. 3. An image input device in which a hand scanner and an apparatus main body for processing image data read by the hand scanner are connected via a wireless transmission path, and an encoding unit for performing error correction encoding on the image data, Transmitting means for transmitting the image data that has been error-correction encoded by the encoding means is provided on the hand scanner side, and receiving means for receiving the image data that has been error-correction encoded by the transmitting means, An image input device, comprising: a decoding means for decoding the error-correction-coded image data received by the receiving means on the apparatus main body side.