JPH05167861A - Image signal transmitting/receiving equipment - Google Patents

Abstract

PURPOSE:To constitute equipment so that its constitution is simplified, transmission and confirmation of a receiving image can be executed, and also, an image signal can be transmitted and received at a high speed. CONSTITUTION:The equipment is constituted so that in compressed data obtained by an orthogonal transform, DC component data, or comparatively low frequency component data in the DC component data and AC component data is transmitted prior to the whole compressed data transmission, and on the receiving side, for instance, a reproducing image is obtained, based on precedent transmitting data, a signal for instructing transmission is sent out to the transmitting side and at least residual data of the compressed data are transmitted, an expansion processing becomes unnecessary, recording to a recording medium can be executed after confirming the contents of a transmission image, and a high speed processing is realized surely and inexpensively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image signal transmitting / receiving apparatus, and more particularly to an image signal transmitting / receiving apparatus for transmitting / receiving an image signal simply and at high speed.

[0002]

2. Description of the Related Art For example, when transmitting image data obtained by shooting with an electronic still camera or the like, the image data has an enormous amount of data, unlike ordinary text data.
If the data is transmitted as it is, the transmission processing time becomes long. Therefore, conventionally, compression processing is often performed to reduce the amount of transmission data by compressing the image data. The image data is compressed by, for example, converting the image data into a digital image signal, performing a two-dimensional transform coding (orthogonal transform) such as a two-dimensional discrete cosine transform, and coding the data amount. There is. The direct current (DC) component coefficient data and the alternating current (AC) component coefficient data obtained by this orthogonal transformation are transmitted as compressed data.

[0003]

As described above, since the conventional image signal transmitting / receiving apparatus transmits the compressed data, the receiving side decompresses the received compressed data by the decompressing process. Since the image cannot be played back and checked until after performing the processing, and processing time for decompression processing is required, not only does it take time for image confirmation and file processing on the sending side and receiving side, There is also the problem that it will be higher.

Therefore, an object of the present invention is to have a simple structure,
An object of the present invention is to provide an image signal transmission / reception device that enables transmission and reception of image signals at high speed while enabling transmission and confirmation of received images.

[0005]

In order to solve the above-mentioned problems, an image signal transmission device of an image signal transmission / reception device according to the present invention includes a DC component data of orthogonal transformation of the image, or a DC component data and an AC component. A first means for transmitting the relatively low frequency component data in advance, and the first means described above.
Is it necessary to restore the entire image of each of the images to which the DC component data of the orthogonal transform or the relatively low frequency component data of the DC component data and the AC component is transmitted first by the means of At least only for the second means for recognizing the transmission selection information indicating whether or not it is received from the receiving system and for recognizing that it is necessary to restore the whole image by the second means. And a third means for subsequently transmitting the remaining AC component data that was previously transmitted by the first means. Further, the image signal receiving device of the image signal transmitting / receiving device according to the present invention is the DC component data of the orthogonal transform of each image received in advance, or the relatively low frequency component data of the DC component data and the AC component. And a first means for obtaining a visible image represented by the data based on the above, and each image requiring restoration of its entire image based on the visible image obtained by the first means. Corresponding to the transmission selection information transmitted in response to the transmission system, the transmission selection information representing the selection result when the selection is made or not. And third means for subsequently receiving at least the residual AC component data of at least the precedingly received orthogonal transformation data of each image transmitted from the transmission system. Composed.

[0006]

According to the present invention, among compressed data obtained by orthogonal transformation, DC component data or relatively low frequency component data of DC component data and AC component data is transmitted prior to the entire compressed data transmission, On the receiving side, for example, a reproduction image is obtained based on the preceding transmission data, and a signal for instructing transmission is transmitted to the transmitting side so that at least the remaining data of the compressed data is transmitted, and the decompression processing is performed. Is unnecessary, and recording on a recording medium is possible after confirming the transmission image content, and reliable, inexpensive, and high-speed processing is realized.

[0007]

EXAMPLES Next, examples of the present invention will be described in detail. In the present invention, only the DC component of the compressed data sent from the transmitting side is sent out, the receiving side reproduces the image based on the DC component coefficient data, and if there is no problem in the reproduced image, a confirmation command signal is sent to the transmitting side. The image signal is transmitted and received, and the remaining AC component coefficient data is received, and the image signal is transmitted and received while confirming the image. Also, only the DC component coefficient data of all the data sent from the transmitting side is transmitted collectively, and the receiving side
To display the split (multi) screen, select the image you want to receive, send the command signal to the sending side, send only the AC component coefficient data of the selected screen to the receiving side to speed up the process. There is.

That is, the coefficient data of the DC component is an averaged DC component value of, for example, an (8 × 8) pixel block when the compression is substantially performed. The image can be reproduced with a screen size of 1/8 of the image. Such processing is the same for the luminance signal and color signal data. Therefore, only the coefficient data of the compressed data is transmitted first, the receiving side does not have any special decompression processing, and the image memory size for data storage is 1/8 × 8 = 1/64 size of the memory of the original image. You can check the uniform image just by preparing
Immediately, the actual compressed data or the remaining data other than the DC component coefficient data is transmitted, and the receiving side performs a combining process to enable high-speed transmission of image data suitable for the purpose. In this case, on the transmission side, the transmission image is expanded and displayed on the monitor, and the contents are not confirmed before transmission, but can be confirmed on a small screen from the coefficient data of the DC component, and the transmission side can also transmit without an expansion circuit. Becomes

Also, if the coefficient data of the DC component is sent for each screen and confirmed and transmitted each time, it takes time,
To configure a small screen based on the coefficient data of all DC components of the image data that needs to be transmitted on the transmitting side, make it a split screen, configure all images as a small screen, and send the split screen itself. You can also In this case, the receiving side selects a desired image screen, sends the selected image data to the transmitting side, and transmits the image data of only the selected image. The receiving side receives this compressed data and records it in a file to enable high-speed transmission with the minimum configuration. Alternatively, management is performed by configuring the above small screen based on the DC component coefficient data received by the receiving side and displaying it on a split screen, selecting the required screen from among them, and designating the required screen for the transmitting side. NO. Can be notified to prompt transmission.

Further, in the process of recording with the camera inside the IC card itself, the coefficient data of the DC component of each image data compressed and recorded is made into a small screen, and the divided screen is recorded in order. It is also possible to record one image in advance as the index image of all the images and transmit this index image in the same manner as the above description so that the receiving side can confirm it.

FIG. 1 shows the outline of the operation of an embodiment of the image signal transmitting / receiving apparatus according to the present invention. In (A), the transmitting side sends only the coefficient data of the DC component of the compressed data of the original image to the receiving side. The receiving side receives the coefficient data and reproduces, for example, a 1/8 size small screen of the original image. In this reproduction, a small screen can be enlarged (mosaic) or enlarged and interpolated. When it is confirmed that the reproduced image is the desired image, a confirmation command is sent to the transmitting side. The transmitting side receives this confirmation command, transmits the compressed data (DC component coefficient data and AC component coefficient data) corresponding to the original image, and the receiving side records the received compressed data in a file. Since the DC component coefficient data has already been sent to the receiving side, the transmitting side may send only the original image AC component coefficient data after receiving the confirmation command as shown in (B). At this time, on the receiving side, the received AC component coefficient data and the previously received DC component coefficient data are combined and recorded in a file as normal compressed data. In the figure, the DC component coefficient data and the AC component coefficient data are shown separately, but the DC component coefficient data and the AC component coefficient data are recorded in order for each 8 × 8 block.

In FIG. 2, the horizontal direction is 768 pixels × the vertical direction 52.
A conceptual diagram in which one screen of 5 pixels is divided into blocks of 8 × 8 pixels and compression processing is performed for each divided block is shown. The averaged level value of the 8 × 8 pixel division block in the shaded area is expressed as the coefficient data of the DC component.
Further, the high frequency component of the divided block is expressed as AC component coefficient data. When one screen is constructed based on the DC component coefficient data of this divided block, a small screen of 96 × 66 pixels is reproduced.

FIG. 3 shows a conceptual diagram when one screen is divided into 64 divided screens and image data is transmitted for each divided screen. On the transmission side, DC component coefficient data and AC component coefficient data DC1 and AC1, DC2 and A, respectively.
C2, DC3 and AC3, ... Divided images IMG1, IMG2, IMG3 containing compressed data composed of DC64 and AC64.
.., DC component coefficient data is extracted from IMG 64, 8 × 8 one-screen data is obtained from the DC component coefficient data, and is transmitted to the receiving side. The data for one screen may be stored in the IC card. On the receiving side, the screen generated from the DC component coefficient data is reproduced from the received one screen data, the image desired to be transmitted is selected, and the selected screen management NO. Is, for example, an 8 × 8 address NO. To notify the sender. On the transmitting side, this management NO. When the received image data is received, the compressed data DCα and ACα of the divided image α notified from the divided images IMG1 to IMG64 are transmitted as normal compressed data. Management No. notified. When there are a plurality of items, they are transmitted sequentially. The receiving side records the received compressed data in a file.

In FIG. 4, DC component coefficient data DC1 to DC64 of each divided screen are transmitted from the transmitting side, one screen is reproduced based on the data DC1 to DC64 received by the receiving side, and the reproduced screen is reproduced. Select the split screen you want to send and select No. Is notified to the sender. On the transmitting side, only the AC component coefficient data ACα of the notified split screen is transmitted. When there are a plurality of notified split screens, they are sequentially transmitted as in the above case. Further, it goes without saying that compressed data including DC component coefficient data may be transmitted. On the receiving side, the received AC component coefficient data A
Cα and the already received DC component coefficient data DCα are combined and recorded in a file as compressed data.

FIG. 5 is a configuration block diagram showing an embodiment of the image signal transmitting / receiving apparatus according to the present invention, showing an application example to an IC card camera. In FIG. 5, C through the lens 1
The subject image formed on the CD 2 is converted into an electric signal, then subjected to predetermined processing such as γ correction in the imaging process circuit 3, and converted into a digital signal in the A / D converter (ADC) 4. The selector 5 is used for the A / D converter 4 during recording.
Digital image data from RAM (frame memory)
Set the route as recorded in 6. The block data read from the RAM 6 (data for each divided block when one screen is divided into a plurality of blocks) is
It is supplied to the compression / expansion unit 8 via the selector 7. DCT / IDCT circuit 81 of compression / expansion unit 8
Is a discrete cosine transform / inverse discrete cosine transform circuit, which performs orthogonal transform processing on the block data. The transform coefficient obtained by the orthogonal transform is the quantization / inverse quantization circuit 82.
After being quantized by, it is encoded by the encoding / decoding circuit 83.

Processing such as coding in the compression / expansion unit 8 is controlled by the coding control circuit 13 based on an instruction from the system control circuit 12. That is, based on the contrast information for each divided area, the system control circuit 12 selects and sets an appropriate Q table for the divided area as described above, and compresses / decompresses it via the encoding control circuit 13. The compression process in the unit 8 is controlled. In this way, the image data compressed and encoded by the compression / expansion unit 8 is supplied to the card interface (I / F) 10 via the selector 9 and recorded in the IC card 11. The system control circuit 12 is a RAM
6, the selectors 7 and 9, the operation of the compression / expansion unit 8, the card interface circuit 10 and the communication control circuit 18 via the encoding control circuit 13, and the operation unit 14
It receives various signals from the camera and controls the entire camera.

At the time of reproduction, the digital image data read from the RAM 6 and supplied through the selector 5 is subjected to a predetermined reproduction process by the reproduction process unit 15 and converted into an analog signal by the D / A converter 16. After EVF
(Electronic viewfinder) 17 and the output terminal on the monitor side. The system control circuit 12 receives operation information such as operation mode setting from the operation unit 14 to which various switches such as a trigger switch are connected, performs corresponding control, and is also connected to the communication control unit 18 to connect the serial interface circuit 19 The communication control operation is performed between and.

The DC component coefficient data read from the IC card 11 via the card interface 10 is first supplied to the serial interface 19 via the system control circuit 12 and the communication control circuit 18. A normal line is connected to the serial interface 19 via a modem, and is connected to a receiving side device via a receiving side modem. The serial interface 19 has an ISDN
It is also possible to connect a specific line via an adapter such as, and to achieve high-speed data transfer using a digital line.

On the receiving side, the contents of the image generated based on the thus received DC component coefficient data are confirmed,
Confirmation signal and management NO. Although a response signal such as a signal is sent to the transmitting side, when the transmitting side receives the response signal, the system control circuit 12 causes the IC card 11 to perform corresponding compressed image data (for example, AC component coefficient data) to be transmitted. ) Is read and sent to the receiving side by operating the trigger switch. At this time, when a cable is connected to the serial interface 19 and the IC card camera is set to the recording mode, the present apparatus operates in the transmission mode to become the transmission apparatus and transmits data by operating the trigger switch. .. On the other hand, when the cable is connected to the serial interface 19 and the IC card camera is set to the reproduction mode, it operates in the reception mode and becomes the reception device.

When operating as a transmitter, the IC card 1
The DC component coefficient data of the compressed data read from 1 is recorded in the RAM 6 via the system control circuit 12 and then read and reproduced via the reproduction process circuit 15 and the D / A converter 16. It is output as a video output and also output to the EVF 17 as a monitor. This monitor allows confirmation of the contents of the transmitted image. Also,
When operating as a receiver, the serial interface 1
9, the received DC component coefficient data is stored in the RAM 6 via the communication control circuit 18 and the system control circuit 12 and is output in the same manner as the monitor, so that the image contents can be confirmed, and the confirmation signal or the like can be obtained by operating the trigger switch. It is transmitted from the serial interface 19.

FIG. 6 is a block diagram showing the configuration of an image transmitting / receiving apparatus, not an IC card camera. In FIG. 6, the components having the same reference numerals as those in FIG. 5 indicate components having the same function. In this embodiment, when operating as a transmitter, the image data read from the IC card 11 or the magneto-optical disk 23 is transmitted in the same manner as described above.
When operating as a receiver, the data is written in a file such as the IC card 11 and the magneto-optical disk 21, and the magneto-optical disk 21 is read / written by the magneto-optical disk drive 20. At this time, a monitor 22 such as an LCD is connected instead of the EVF.

By the way, in FIGS. 5 and 6, the compression / expansion circuit 8 is a circuit used when the image data read from the IC card 11 or the magneto-optical disk 21 is normally reproduced, and the image data transmission in the present invention. And not required directly for receive operation. Therefore, the compression / expansion circuit can be omitted, and the circuit configuration can be further simplified and the cost can be reduced. FIG. 7 is a block diagram of the circuit of FIG. 6 from which the compression / decompression circuit 8 has been removed. At the time of transmission, the DC component coefficient data read from the IC card 11 via the card interface 10 or read from the magneto-optical disk 21 via the magneto-optical disk drive 22 is stored in the RAM 6 and is similar to the above. It can be played back on the monitor and the contents of the transmitted image can be confirmed. At the time of reception, the DC component coefficient data received via the serial interface 19 and the communication control circuit 18 is input to the system control circuit 12 and stored in the RAM 6 to perform similar monitor reproduction.

FIG. 8 shows a structure in which the magneto-optical disk drive 22 and the magneto-optical disk 21 are removed in the structure shown in FIG.
FIG. 3 is a configuration block diagram of an image transmission / reception device with the simplest configuration using only the IC card 11 as a recording medium.

Next, the transmission process and the reception process will be described with reference to FIGS. Referring to FIG. 9, when the transmission mode is set and the transmission process is started, first, which image in the IC card is to be transmitted is selected by a key operation of the operation unit (step S1). Next, the DC component coefficient data of the selected image is extracted (step S2), the small screen transmission mode is set (step S3), and set to the receiving side. Then, the DC component coefficient data is transmitted (step S
4), contents of received image reproduced on the receiving side (small screen)
The selection information of the image selected on the basis of is received (step S5), the reception is confirmed (step S6), and when the reception is confirmed, the one image compressed data is sent (step S7). On the receiving side, this sent data is received,
When it is normally received, the command of "OK" is sent to the transmitting side. Therefore, the transmitting side judges whether or not the sending is normal by this command (step S
8). If it is normal, the transmission is completed, and if it is not normally sent due to a line error or the like, step S7.
Return to processing. On the other hand, when the reception of the selection information is not confirmed in step S6, the image is retransmitted from the receiving side in response to the selection request (step S6).
9) If it is transmission, the process returns to step S4, and if it is selected, the process returns to step S1.

In the receiving mode, as shown in FIG. 10, it is judged whether the receiving mode is normal or small screen (step S10). If the small screen is selected, the DC component coefficient data is received. (Step S11), the small screen is reproduced and displayed (step S12), and the small screen is confirmed to determine whether or not the image is a desired image (step S1).
3). If it is a desired image, OK information to that effect is sent to the transmitting side (step S14), the normal reception mode is switched (step S15), and one image compressed data is received (step S16). Whether or not it is determined (step S17), if not normal, the process returns to step S16 to receive again, and if normal, it is recorded on a recording medium such as a magneto-optical disk or an IC card (step S1).
8) The reception is completed. When the reception mode is the normal reception mode in step S10, step S1
The process moves to step 5.

If it is determined in step S13 that the image is not the desired image, it is determined whether the retransmit mode is for the same image data or another image data (step S19). If it is for the same data, the same data is requested (step S20), the process returns to the process of S11, and if it is for other image data, the other image data is requested (step S21), and the process of step S11 is performed. Return to.

The transmission process for displaying a split screen is shown in FIG.
As shown in FIG. 1, first, the split screen mode is set (step S31). For example, the DC component coefficient data is extracted for each of the small screens 1 to 64 (step S32), and the split screen mode is notified to the receiving side (step S33).
Then, the split screen data is transmitted (step S34),
It is determined whether or not the reception of the selection information sent from the receiving side is normal (step S35). If it is determined to be normal, the selection data selected based on the selection information is sent (step S36). All the selected data are transmitted, and it is determined whether the transmission is completed (step S37). If it is determined that the transmission is completed, the transmission is completed, and if not completed, the process returns to step S36.

In the receiving process at this time, as shown in FIG. 12, it is judged whether the mode notified from the transmitting side is the normal mode or the split screen (step S38), and when the split screen is the split screen, the split screen data is received. Then, the desired screen (image) is selected from the reproduced and displayed split screens (step S39). It is determined whether or not this selection is completed (step S40).
The selection information of each child screen is transmitted and the screen (image) to be transmitted is requested to the transmission side (step S41). Next, after switching to the normal mode (step S42) and receiving one image compressed data (step S43), it is determined whether or not the received image is normal (step S44). If it is determined to be normal, it is recorded on the recording medium (step S4).
5) It is determined whether recording of all the selected images has been completed (step S46). If completed, the transmission is completed, and if not completed, the process returns to step S43. If the received image is not normal in step S44, a re-sending request is made (step S47), and the process returns to step S43.

[0029]

As described above, the image signal transmitting / receiving apparatus according to the present invention is one of the compressed data obtained by orthogonal transformation.
DC component data, or relatively low frequency component data of DC component data and AC component data is transmitted prior to the entire compressed data transmission, and the receiving side, for example, a reproduced image based on the preceding transmission data. Since it is configured to send a signal instructing the transmission to the transmitting side to transmit at least the remaining data of the compressed data,
Not only is the decompression process unnecessary as in the prior art, but since the contents of the transmitted image can be recorded on the recording medium after confirmation, reliable and inexpensive high-speed processing is also possible.

[Brief description of drawings]

FIG. 1 is a diagram showing an operation outline of an embodiment of an image signal transmitting / receiving apparatus according to the present invention.

FIG. 2 shows 768 pixels in the horizontal direction × 5 in the vertical direction in this embodiment.
It is a conceptual diagram in the case of dividing one screen of 25 pixels into blocks of 8 × 8 pixels and performing compression processing for each divided block.

FIG. 3 is a conceptual diagram when one screen is divided into 64 divided screens and image data is transmitted for each divided screen in the present embodiment.

FIG. 4 is a diagram illustrating a case where a DC component coefficient data DC1 to DC64 of each divided screen is transmitted from the transmitting side in the present embodiment, one screen is reproduced based on the data DC1 to DC64 received by the receiving side, and the reproduced screen is displayed. Select the split screen you want to send and select No. It is a conceptual diagram which notifies a transmitting side.

FIG. 5 is a configuration block diagram showing an embodiment of an image signal transmitting / receiving apparatus according to the present invention.

FIG. 6 is a configuration block diagram of an image transmission apparatus according to an embodiment of the present invention.

FIG. 7 is a block diagram of the circuit of FIG. 6 with the compression / expansion circuit 8 removed.

FIG. 8 is a diagram showing a configuration of the IC card 1 in which the magneto-optical disk drive 22 and the magneto-optical disk 23 are removed in the configuration shown in FIG.
It is a block diagram of an image transmitting / receiving apparatus of the simplest configuration using only one as a recording medium.

FIG. 9 is a flowchart showing a transmission process in a transmission mode according to the embodiment of the present invention.

FIG. 10 is a flowchart showing a reception process in a reception mode according to the embodiment of the present invention.

FIG. 11 is a flowchart showing a transmission process in a transmission mode for displaying a split screen according to the embodiment of the present invention.

FIG. 12 is a flowchart showing a reception process in a reception mode for displaying a split screen according to the embodiment of the present invention.

[Explanation of symbols]

1 lens 2 CC
D 3 Imaging process circuit 4 A /
D converter 5, 7, 9 selector switch 6 RA
M 8 compression / expansion unit 10 card interface circuit 11 IC card memory 12 system control circuit 13 encoding control circuit 14 operation unit 15 reproduction process circuit 16 D /
A converter 17 EVF 18 Communication control circuit 19 Serial interface circuit 20 Magneto-optical disk drive 21 Magneto-optical disk 22 LC
D monitor

Claims (2)

[Claims] 1. A first means for transmitting DC component data of orthogonal transformation of the image, or relatively low frequency component data of DC component data and AC component in advance, and the first means. Whether or not each of the images to which the DC component data of the orthogonal transform or the relatively low frequency component data of the DC component data and the AC component is transmitted in advance by the means is required to restore its entire image. At least the second means for receiving and recognizing the transmission selection information indicating the above from the receiving system, and at least each of the images for which it is recognized that it is necessary to restore the entire image by the second means. An image signal transmitting apparatus comprising: a third means for subsequently transmitting the remaining AC component data which was previously transmitted by the first means. 2. A DC component data of an orthogonal transform of each image received in advance, or a visible image represented by the data based on relatively low frequency component data of the DC component data and the AC component. A first means for obtaining an image, and a selection as to whether or not each relevant image requires restoration of its entire image based on the visible image obtained by the first means. Second means for responding and transmitting the transmission selection information indicating the selection result to the transmission system, and each of the transmission systems transmitted from the transmission system in response to the transmission selection information response-transmitted by the second means. An image signal receiving apparatus comprising: third means for subsequently receiving at least the remaining AC component data of the orthogonally-transformed data of the image, which has been previously received.