JPH05323944A - Image producing device and image display device - Google Patents

Abstract

PURPOSE:To display an undistorted image on the image display device at a correct pixel without any troublesome adjustment when image data having a value different from an original pixel aspect ratio are reproduced by the image reproducing device. CONSTITUTION:A CPU 1 separates pixel aspect ratio information added to image data read out of a disk 5 and sends it to a synchronizing signal processing circuit 15 through a display control I/F 12. The synchronizing signal processing circuit 15 uses the synchronizing signal generated by the synchronizing signal generating circuit 11 to generate the driving signal for a CRT 14 and also uses the sent pixel aspect ratio information to control the amplitude of a deflecting voltage, thereby adjusting the horizontal and vertical image display sizes of the image display device 200.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reproducing apparatus for reproducing digitally processed image data for storage or transmission, and an image display apparatus which is connected to the image reproducing apparatus to display an image on a screen. In particular, the present invention relates to an image reproducing device and an image reproducing device that can make the pixel aspect ratio of an image displayed on a screen have a correct value.

[0002]

2. Description of the Related Art As a device for processing digitized image data and sending it to an image display device, there are many devices such as an image filing device, an image transmission device, a workstation, and a personal computer. ing. Usually, these image reproducing devices are designed to use their own displays as image display devices, and the frequency of each horizontal and vertical synchronizing signal in the output image signal and the length of the blanking period, and , It had various specifications in terms of pixel aspect ratio.

The pixel aspect ratio referred to here is not the ratio of the width and height of the entire screen, but the ratio of the height and width of each digitally expressed pixel. If the pixel aspect ratio is not reproduced correctly, there arises a problem that distortion occurs, for example, a circle looks like an ellipse on the display screen.

Therefore, in image display devices other than those designed specifically for a specific image reproduction device, the vertical and horizontal image display sizes on the screen are adjusted in accordance with the connected image reproduction device to determine the pixel aspect ratio. It was necessary to reproduce it correctly.

In order to simplify this adjustment work, for example,
As in the image display device described in Japanese Patent Application Laid-Open No. 63-136773, the frequency of the horizontal and vertical synchronizing signals of the input image signal is detected and the optimum image display size is selected from preset image display sizes. There were things that made me choose something.

[0006]

However, when trying to exchange image data to be displayed between a plurality of image reproducing devices via a recording medium or a communication path, the following problems occur. ..

That is, as described above, is the image display device designed only for the connected image reproducing device?
Alternatively, since the image display size and the like are adjusted according to the connected image reproducing device, the image data created by the other image reproducing device is transferred to a certain image reproducing device via a recording medium or a communication path. When transmitted and attempted to be displayed on the image display device connected to the image reproduction device, the pixel aspect ratio of the image data to be displayed will be different from the original value, and the image will be distorted vertically or horizontally. Will end up. Therefore, in order to display the image without distortion, it is necessary to manually adjust the image.

Further, for example, the image display device as in the above-mentioned proposed example, that is, the frequency of the synchronizing signal of the input image signal is detected, and the optimum one is selected from preset image display sizes. Even if such an image display device is used, the frequency of the synchronization signal of the image signal input from the connected image reproduction device is the same as when the image data created by another image reproduction device is transmitted. However, since there is no change, in order to display the image without distortion, it is still necessary to manually adjust the image.

It is an object of the present invention to reproduce an image data having a value different from the original pixel aspect ratio in the image reproducing device, and to perform a correct pixel aspect ratio in the image display device without making a troublesome adjustment. An object of the present invention is to provide an image reproducing device and an image display device capable of displaying an image without distortion.

[0010]

In order to achieve the above object, in the present invention, an image reproducing device is provided with a data separating means for separating pixel aspect ratio information added to image data, and a separated pixel. A transmission means for transmitting the aspect ratio information to the image display device is provided. further,
The image display device receives the pixel aspect ratio information transmitted from the transmission device of the image reproduction device, and the horizontal or vertical image display size of the displayed image or both the horizontal and vertical image display sizes. A size varying means for changing the pixel aspect ratio information is provided.

Alternatively, in the image reproducing apparatus, data separating means for separating the pixel aspect ratio information added to the image data, the frequency of the pixel clock of the image signal to be output, and the pixels per cycle of the synchronizing signal of the image signal. A display timing changing means for changing both or either of the clock numbers and a control means for controlling the display timing changing means in accordance with the output of the data separating means may be provided.

[0012]

The pixel aspect ratio information separated by the data separating means is transmitted to the image display device, and in the image display device, the image is displayed horizontally in accordance with the transmitted pixel aspect ratio so that the image is displayed in the correct pixel aspect ratio. Adjust the vertical image display size. In this way, the pixel aspect ratio of the image sent from the image reproduction device to the image display device can be correctly reproduced.

Alternatively, the display timing varying means is controlled according to the pixel aspect information separated by the data separating means, and the ratio of the effective image display period to one scanning period of the image signal output from the image reproducing device to the image display device. Change. As a result, the pixel aspect ratio of the image displayed on the image display device is changed so that the image is displayed with the correct pixel aspect ratio.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a first embodiment of the present invention, FIG. 1 shows the present invention in an image file device for reading out image data recorded on a large-capacity disk such as a magneto-optical disk and displaying it on a screen of a display. It is a block diagram which shows the structure of an image reproduction apparatus and an image display apparatus when applied. The image reproducing device 100 corresponds to the main body part of the image file device, and the image display device 200 corresponds to the display part.

The image reproducing apparatus 100 includes a CPU 1, a memory 2, a disk interface (hereinafter, the interface is abbreviated as I / F) 3, a decoder 7, and a display control I / F 12, which are connected to each other via a bus 6. A disk drive 4 connected to the disk I / F 3 and containing the disk 5, a frame memory 8 connected to the decoder 7, and a DA converter 9 connected to the frame memory 8.
And a clock generation circuit 10 for supplying a clock to each part
And a synchronization signal generation circuit 11 which receives the output of the clock generation circuit 10 at its input.

The image reproducing device 100 includes an image display device 20.
0 is connected, and the image signal output from the DA converter 9, the synchronization signal output from the synchronization signal generation circuit 11, and the display control signal output from the display control I / F 12 are sent to the image display device 200. Be done.
The image signal is processed in the signal processing circuit 13, and the CRT is processed.
Sent to 14. The sync signal and the display control signal are sent to the sync signal processing circuit 15 to control the display screen of the CRT 14.

The operation for displaying an image in FIG. 1 will be described below. Image data recorded on a large-capacity disk 5 such as a magneto-optical disk mounted on the disk drive 4 is transferred to a bus 6 via a disk I / F 3.
Read on. The CPU 1 controls each part connected to the bus 6 in accordance with a program stored in the memory 2, and information about a pixel aspect ratio added to the image data read from the disk 5 (hereinafter,
Pixel aspect ratio information) is separated from the image data and sent to the display control I / F 12, while the image data is sent to the decoder 7.

The pixel aspect ratio information is added to the image data as
For example, it is added as header information and recorded on the disc 5. Then, a disk read control program conforming to this format is loaded in the memory 2 and the CPU 1 executes this program,
The pixel aspect ratio information can be separated from the read image data. The image data itself is converted into a format suitable for image storage, for example, a data-compressed format, and recorded on the disk 5.

The image data sent to the decoder 7 is restored in the decoder 7 and written in the frame memory 8. From the frame memory 8, the read clock generated by the clock generation circuit 10 and the synchronization signal generation circuit 11
The image data is read out according to the horizontal and vertical synchronizing signals generated in step A, converted into an analog image signal in the DA converter 9, and sent to the signal processing circuit 13 of the image display device 200. The synchronization signal generation circuit 11 generates horizontal and vertical synchronization signals based on the clock from the clock generation circuit 10, supplies them to the image display device 200, and uses them as timing references for the image signals read from the frame memory 8. ..

The image signal output from the DA converter 9 is amplified in the signal processing circuit 13 of the image display device 200 and reaches the CRT 14. On the other hand, the sync signal generated by the sync signal generation circuit 11 is sent to the sync signal processing circuit 15 and used to generate a drive signal for the CRT 14. In addition, the pixel aspect ratio information sent to the display control I / F 12 is sent to the synchronization signal processing circuit 15 as a display control signal to control the amplitude of the deflection voltage.
The horizontal and vertical image display sizes in the image display device 200 are adjusted.

FIG. 2 is a block diagram showing a specific example of the synchronizing signal processing circuit 15 in the image display device 200 of FIG. The sync signal is separated into horizontal and vertical sync signals in the sync separation circuit 21, and is sent to the horizontal oscillation circuit 22 and the vertical oscillation circuit 23 as a reference for the oscillation frequency.
A sawtooth wave signal for CRT deflection is generated in each of the oscillation circuits 22 and 23, sent to the variable gain circuits 24a and 24b, adjusted in amplitude, and then sent to the deflection circuit of the CRT 14.

The controller 29 controls the image reproducing device 100.
The display control signal sent from the device is received via the I / F 30 and stored in the register 28 as data. Further, the data stored in the register 28 is stored in the ROM 2
7 and inputs the outputs to registers 26a and 26b.
Write in. The outputs of the registers 26a and 26b are DA
It is converted into an analog voltage in converters 25a and 25b and used as a control voltage for variable gain circuits 24a and 24b.

In the ROM 27, the values to be set in the registers 26a and 26b when a certain pixel aspect ratio value is given are written in advance in accordance with the pixel aspect ratio. Here, in the registers 26a and 26b, control voltages capable of obtaining horizontal and vertical image display sizes such that the given pixel aspect ratio is correctly reproduced on the screen of the CRT 14 are provided to the variable gain circuits 24a and 24a. 24
The value given to b is set.

FIG. 3 is an explanatory diagram showing how the pixel aspect ratio of the display image is reproduced on the CRT 14 in the image display device 200 of FIG. FIG. 3A is an example of a display screen when the pixel aspect ratio is correctly reproduced, and a circle is displayed as a circle. 3 (b) is shown in FIG.
This is an example of a display screen when an image with a pixel aspect ratio longer than that of FIG. 3A is displayed as it is in the same state as FIG. It is displayed as an ellipse.

However, according to the present embodiment, by reducing the horizontal image display size on the CRT 14, the original pixel aspect ratio of the image can be reproduced as shown in FIG. Can be correctly displayed as a circle.

Further, FIG. 3C is an example of a display screen in the case where an image whose pixel aspect is wider than that of FIG. 3A is displayed in the same state as that of FIG. The circle is displayed as a vertically elongated ellipse because it is displayed in a wide area.

However, according to the present embodiment, in this case as well, by reducing the vertical image display size on the CRT 14, the original pixel aspect ratio of the image can be reproduced as shown in FIG. The circle can be displayed correctly as a circle.

As described above, according to this embodiment, the image data and the pixel aspect ratio information of the image data are written together on the disk 5, so that this image is displayed on the screen of the CRT 14 of the image display device 200. It can be displayed with the correct pixel aspect ratio. Moreover, since the adjustment of the image display size can be automatically performed, troublesome adjustment is not required.

Next, a second embodiment of the present invention will be described. FIG. 4 is a block diagram showing the configuration of the image reproducing apparatus as the second embodiment of the present invention. In FIG. 4, FIG.
The same parts as those of the image reproducing apparatus are attached with the same numbers. The present embodiment is different from the image reproducing apparatus shown in FIG. 1 in that a register 16 for storing pixel aspect ratio information connected to the bus 6 is provided and that the value written in this register 16 is the clock generation circuit 17. And the synchronization signal generation circuit 18 to control the operation of these circuits.

FIG. 5 is a block diagram showing a specific example of the clock generating circuit 17 and the synchronizing signal generating circuit 18 in the image reproducing apparatus of FIG. The clock generation circuit 17 includes a ROM 31 that receives the output of the register 16 and a ROM 31.
DA converter 32 that converts the output of the
And a VCO 33 that changes the oscillation frequency according to the output voltage of the DA converter 32, and the output of the VCO 33 is output as a clock.

On the other hand, the synchronizing signal generating circuit 18 has ROMs 34a and 34b which receive the output of the register 16 as an input, and R.
The counters 35 and 36 have outputs of the OMs 34a and 34b as preset inputs, and the decoders 37 and 38 having outputs of the counters 35 and 36 as inputs, respectively. The counter 35 outputs V from the initial value given from the ROM 34a to the final value defined by the decoder 37.
The number of clocks output by the CO 33 is counted and a horizontal synchronizing signal of the output image signal is generated. Similarly, the counter 36 counts the horizontal synchronizing signal from the initial value given from the ROM 34b to the final value defined by the decoder 38, and generates the vertical synchronizing signal of the output image signal.

The ROM 31 or the ROMs 34a and 34b store the correspondence relationship between the pixel aspect ratio value and the clock frequency or the correspondence relationship between the pixel aspect ratio value and the sync signal period. By writing the ratio, the frequency of the generated clock or the number of clocks per period of the horizontal and vertical sync signals can be changed.

FIG. 6 is a timing chart showing an example of how to change the timing of the image signal and the synchronizing signal output from the image reproducing apparatus of FIG. 4 when the pixel aspect ratio is changed. In each of FIGS. 6A to 6C, the upper stage shows the image signal and the lower stage shows the horizontal synchronizing signal.

FIG. 6A shows the timing in the case of the standard pixel aspect ratio in the image reproducing apparatus. Therefore, when reproducing an image having a pixel aspect ratio that is horizontally longer than in this case, the clock frequency is increased and the number of clock counts in one horizontal period is increased. As a result, as shown in FIG. 6B, the horizontal frequency of the horizontal synchronizing signal is kept constant and compared with FIG.
The effective image display period during the horizontal period can be shortened. As a result, on the screen of the image display device, as shown in FIG.
Compared with the case of, the image is displayed in a contracted horizontal direction,
The pixel aspect ratio can be reproduced correctly.

On the other hand, when an image having a vertically long pixel aspect ratio is reproduced as compared with the case of FIG. 6A, the clock frequency is lowered and the clock count number for one horizontal period is reduced. As a result, as shown in FIG. 6C, the effective image display period in one horizontal period can be lengthened as compared with FIG. 6A while keeping the horizontal frequency of the horizontal synchronizing signal constant. .. As a result, on the screen of the image display device, the image is stretched and displayed in the horizontal direction as compared with the case of FIG. 6A, and the pixel aspect ratio can be correctly reproduced.

As described above, according to the present embodiment, the horizontal and vertical effective image display periods of the output image signal can be changed according to the pixel aspect ratio of the image to be reproduced, so that the image display can be performed. It is possible to correctly reproduce the pixel aspect ratio of the image displayed on the device. Moreover,
In this embodiment, since the pixel aspect ratio is adjusted only on the image reproducing device side, the conventional image display device can be used as it is.

In this embodiment, the pixel aspect ratio is changed by operating the period of the horizontal synchronizing signal, but the pixel aspect ratio is changed by operating the period of the vertical synchronizing signal in the same manner. It is also possible to

FIG. 7 is a block diagram showing the arrangement of an image reproducing apparatus as the third embodiment of the present invention. In the present embodiment, in addition to the configuration of the image reproducing apparatus shown in FIG. 4, a drawing circuit 19 for drawing in the frame memory 8 is added, and a clock generation circuit 17a and a synchronization generation circuit 18a are provided.
Each of them has a function of adjusting the control method according to the pixel aspect ratio.

The drawing circuit 19 draws a figure such as a straight line or a circle in the frame memory 8 based on a command from the CPU 1. An example thereof is GDP manufactured by Hitachi Ltd.
(HD64400). The CPU 1 separates the pixel aspect ratio information added to the image data read from the disk 5 from the image data and registers it.
In accordance with the value of the pixel aspect ratio, the frame memory 8 draws a graphic such as a circle or a square that can easily determine whether the pixel aspect ratio is correct when displayed on the image display device.

As an example, when the pixel aspect ratio is 1 in the vertical direction and 0.8 in the horizontal direction, a square having a size of 80 pixels in the vertical direction and 100 pixels in the horizontal direction is written in the frame memory 8.
If the pixel aspect ratio is correctly reproduced on the screen of the image display device, this rectangle should be displayed with the same vertical and horizontal lengths. Therefore, by utilizing this, the pixel aspect ratio on the screen of the image display device can be adjusted to a correct value.

FIG. 8 is a block diagram showing a specific example of the register 16, the clock generating circuit 17a and the synchronizing signal generating circuit 18a in the image reproducing apparatus of FIG. In the configuration shown in FIG. 8, as compared with the configuration shown in FIG. 5, the ROM portion can be replaced with the RAMs 39, 40a, 40b, and the contents of these RAMs 39, 40a, 40b can be rewritten from the bus 6. The difference is that I made it. The other parts are exactly the same as the configuration shown in FIG. 5, and the frequency of the clock and the number of clock counts in one horizontal period are changed according to the pixel aspect ratio information written in the register 16.

Therefore, in the configuration of FIG.
By providing 0a and 40b, the correspondence relationship between the pixel aspect ratio information of the image read from the disk 5 and the frequency of the clock, and the correspondence relationship between the pixel aspect ratio information and the periods of the horizontal and vertical sync signals. Can be adjusted to be optimal for each image display device that is actually connected. If a non-volatile element such as an EEPROM is used as the RAM, this adjustment only needs to be performed once at the beginning, and thereafter, there is no need to readjust unless the connected image display device is changed.

As described above, according to the present embodiment, the frequency of the generated clock and the horizontal and vertical effective image display periods of the output image signal can be changed according to the pixel aspect ratio of the image to be reproduced. The pixel aspect ratio of the image displayed on the image display device can be set to a correct value. Further, since the correspondence between the pixel aspect ratio and the clock frequency and the correspondence between the pixel aspect ratio and the effective image display period can be optimized in accordance with the connected image display device, the connected image display device can be used. Not selected. Furthermore, since a reference signal for adjustment can be generated according to the pixel aspect ratio of the image to be reproduced, adjustment can be performed easily, and especially for images that require exact reproduction of the pixel aspect ratio. Even 1
The display image can be adjusted to an appropriate value one by one.

The drawing circuit 1 used in this embodiment
If 9 is added to the image reproducing device shown in FIG. 1 or 4, it can be used as an adjustment reference signal when the image display device is provided with a fine adjustment mechanism of the image display size.

Further, in each of the above-described embodiments, the case where the present invention is applied to the image file device has been described, but the present invention is not limited to this, and a workstation or a personal computer and an external storage device are combined. It may be a different system. The present invention is also applicable to an image transmission device using a network or the like. Further, although the CRT display is taken as an example of the image display device, the present invention can be applied to a projection type display and the like. Furthermore, the present invention can be applied to the case where a video printer or the like is used as the image display device. In this case, the pixel aspect ratio is controlled by controlling the feed speed of the paper to be printed instead of controlling the deflection voltage. The ratio can be adjusted. Although the image reproducing device and the image display device are separate for convenience of description, even if they are integrated, the effect of the present invention does not change.

[0046]

According to the present invention, when reproducing image data having a value different from the original pixel aspect ratio in the image reproducing device, the correct pixel aspect ratio in the image display device can be obtained without making troublesome adjustment. It is possible to realize an image reproducing device and an image display device capable of displaying an image without distortion.

[Brief description of drawings]

FIG. 1 is a block diagram showing configurations of an image reproducing apparatus and an image display apparatus as a first embodiment of the present invention.

2 is a block diagram showing a specific example of a synchronization signal processing circuit 15 in the image display device 200 of FIG.

3 is a CRT 14 in the image display device 200 of FIG.
It is explanatory drawing which shows a mode that the pixel aspect ratio of a display image is reproduced above.

FIG. 4 is a block diagram showing a configuration of an image reproducing device as a second embodiment of the present invention.

5 is a block diagram showing a specific example of a clock generation circuit 17 and a synchronization signal generation circuit 18 in the image reproduction device of FIG.

6 is a timing chart showing an example of timings of an image signal and a synchronization signal output from the image reproducing apparatus of FIG.

FIG. 7 is a block diagram showing a configuration of an image reproducing device as a third embodiment of the present invention.

8 is a register 16, a clock signal generation circuit 17a, and a synchronization signal generation circuit 18a in the image reproduction device of FIG.
It is a block diagram which shows one specific example.

[Explanation of symbols]

1 ... CPU, 7 ... Decoder, 8 ... Frame memory, 10,
17, 17a ... Clock generation circuit, 11, 18, 18a
... Synchronization signal generation circuit, 12 ... Display control I / F,
15 ... Sync signal processing circuit.

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI Technical display location H04N 5/93 C 4227-5C 7/01 Z 9070-5C 7/08 Z 9070-5C

Claims (6)

[Claims] 1. An image decoder for restoring image data converted to a first format for storage or transmission to a second format for display, and the image restored to the second format. An image memory for temporarily storing data, and reading the stored image data from the image memory,
In the image reproducing device which supplies the image display device as an image signal, the information on the pixel aspect ratio of the image added to the image data converted into the first format (hereinafter, referred to as pixel aspect ratio information) is An image reproducing device comprising: a data separating device for separating the image data from the image data; and a transmitting device for transmitting the separated pixel aspect ratio information to the image display device. 2. An image display device, which is supplied with the image signal from the image reproducing device according to claim 1 and displays an image on the screen according to the image signal, transmitted from the transmitting means of the image reproducing device. Receiving means for receiving the pixel aspect ratio information, and size varying means for changing the horizontal or vertical image display size of the displayed image or both the horizontal and vertical image display sizes according to the received pixel aspect ratio information. An image display device comprising: 3. An image decoder that restores image data converted to a first format for storage or transmission to a second format for display, and the image restored to the second format. An image memory for temporarily storing data, and reading the stored image data from the image memory,
In the image reproducing device which supplies the image display device as an image signal, the information on the pixel aspect ratio of the image added to the image data converted into the first format (hereinafter, referred to as pixel aspect ratio information) is Data separating means for separating from image data, and adjusting means for adjusting the pixel aspect ratio of the image displayed by the supplied image signal on the screen of the image display device according to the separated pixel aspect ratio information, An image reproducing device characterized by being provided with. 4. The image reproducing apparatus according to claim 3, wherein the adjusting unit generates a read clock used when the stored image data is read from the image memory, and separates the pixel aspect ratio. A clock generating unit that changes the frequency of the read clock that is generated according to information, and the number of the read clock that is generated is counted, and a certain first value to a certain second value is counted.
Every time it counts up to a value of, a synchronization signal for determining the timing of the image signal is generated and supplied to the image display device, and the first and / or the first and / or the second is supplied according to the separated pixel aspect ratio information. 2. A synchronizing signal generating means for changing the value of 2 and changing the number of the read clocks per cycle of the synchronizing signal generated, the image reproducing apparatus. 5. The image reproducing apparatus according to claim 4, wherein when the frequency of the read clock is changed in the clock generation means in accordance with the pixel aspect ratio information, the pixel aspect ratio information and the read clock Correspondence between the pixel aspect ratio information and the cycle of the sync signal when changing the cycle of the sync signal in accordance with the pixel aspect ratio information in the sync signal generating means, respectively. An image reproducing apparatus comprising: an adjusting unit that adjusts the image display device according to the image display device; and a storage unit that stores the adjusted correspondence relationship. 6. The image display device according to claim 1, wherein the image data or the image signal having an image aspect ratio according to the separated pixel aspect ratio information and including a specific figure as an image. An image reproducing apparatus comprising an image generating means for generating the image.