JPH02219385A - Recording medium - Google Patents

Abstract

PURPOSE:To shorten a waiting time until a picture appears by recording picture element data in one piece of a picture separately to four blocks such as an odd number in a central part, the odd number in a peripheral part, an even number in the central part and the even number in the peripheral part. CONSTITUTION:Out of respective picture elements Qi of a central part 33 in one piece of the picture, the picture element data of the odd number are defined as a block 201 and recorded to an optical disk together with a data block signal 101 at first. After that, the picture element data of the odd number in the peripheral part, even number in the central part and even number in the peripheral part are successively recorded. When the desired picture is read, the picture is read in this order and when the first block is stored to a frame memory, the coarse picture of this central part is displayed. Next, the high definition picture of the central part is displayed and continuously, the coarse picture and high definition picture of the peripheral part are displayed by stages. Thus, the practical waiting time until the picture is confirmed can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image recording medium that allows for high-speed retrieval of video signals from a filing device.

[Conventional technology]

Conventionally, in order to record a large number of color still images, CD-RO
A filing device using a recording medium such as M is known. In order to play back one frame's worth of image data stored in such a filing device on a receiver, first read out the one frame's worth of image data and store it in a file with a capacity for one frame. The image data is written into a frame memory, and when the writing is completed, the image data is repeatedly read out from the frame memory at a predetermined frame period and added to the receiver to reproduce a color image.

[Problem to be solved by the invention]

By the way, in the above-mentioned image filing device, if the sampling frequency is increased or the number of quantization is increased in order to increase the resolution of the image, the amount of data increases, so the image data is not transferred from the filing device. The time required for reading is extremely long. In this way, a long waiting time, for example several seconds or more, is required for the image to appear on the receiver after it has been transferred to the frame memory. Time could not be ignored, and improvements were required.

An object of the present invention is to provide an image recording medium that can solve these problems and shorten the waiting time until an image appears.

[Means to solve the problem]

A recording medium according to the present invention is a recording medium on which image data of a plurality of images are recorded, in which image data of each of the plurality of images is recorded in a first . Second. The remaining pixel data obtained by thinning out some pixel data of the image data displaying a specific part of the image is recorded in the first area, and the remaining pixel data is recorded in the second area. In the area, remaining pixel data after thinning out some pixel data of the image data that displays a part other than the specific part of the image is recorded,
In the third w4 area, the pixel data of the thinned-out part of the image data that displays the specific part of the image is recorded, and in the fourth area, the pixel data of the minus part that displays the specific part of the image is recorded. The present invention is characterized in that pixel data of a part of the image data that displays the part is thinned out and recorded.

[Effect]

Therefore, if the image data recorded in the first to fourth areas is played back in the order of 1st - 2nd = 3rd -> 4th area, the reproduced image will be sequentially changed from coarse to fine. It can be completed.

〔Example〕

Hereinafter, an embodiment of a color image recording medium according to the present invention and an example of a reproducing apparatus thereof will be described with reference to FIGS. 1 to 9.

FIG. 8 is a system diagram of a color image reproducing apparatus for reproducing color images from a color image recording medium according to the present invention.

In FIG. 8, an optical disc 1, such as a CD-ROM, on which a large amount of digital data is recorded is placed on a turntable and rotated by a spindle motor 2. As shown in FIG. The optical pickup 3 is movable in the radial direction of the optical disc 1, and as will be described later, digital data of a high-definition image is recorded on the optical disc 1.

Image data picked up by the optical pickup 3 is supplied to a data processing circuit 4. The data processing circuit 4 is controlled by a microcomputer (hereinafter referred to as CPU) 5,
A write address 14 is supplied from the CPU 5 to an address selector 13. The address selector 13 also includes a read address generator 1 controlled by the CPLI 5.
A read address is also supplied from 2. frame memory 8
On 9.10.11, one of the write address 14 from the CPU 5 and the read address from the read address generator 12 is selected by the address selector 13, and data writing or reading is selected by these write or read addresses. be done.

Image data from data processing circuit 4 is supplied via bus 7 to frame memories 8, 9, 10 and 11.

One output end 8a of each of the frame memories 8 and 10
and IOa are connected to latch circuits 15 and 21 which latch the color difference signal R-Y and the luminance signal Yh with n being an odd number, and the other output terminals 8b and IOb of the frame memories 8 and 10 are connected to the color difference signals B-Y and IOa. It is connected to latch circuits 18 and 22 that latch the luminance signal Y1□.

Similarly, one of the output ends 9a and Ila of the frame memories 9 and 11 is connected to latch circuits 24 and 28 that latch the color difference signal RY and the luminance signal Y, with n being an even number. Output ends 9b and l
lb is connected to latch circuits 26 and 29 that latch the color difference signal BY and the luminance signal Y7.2.

The outputs of latch circuits 15.18 are connected to latch circuits 16.19. The outputs of latch circuits 24.26 are connected to latch circuits 25.27. Latch circuits 16 and 25
The output of is a digital to analog converter for R-Y (hereinafter referred to as
/A) 17, and the latch circuits 19 and 27
The output of is connected to D/A 20 and launch circuit 21.22
Also, the outputs of the latch circuits 28 and 29 are connected to the D/A 23. The outputs of the D/AIs 7, 20, and 23 are connected to a matrix circuit 30, respectively.The red R2 green G and blue B color signals from the matrix circuit 30 are supplied to a display means to display an image.

FIG. 1 shows the data arrangement of a recording medium according to the present invention, FIG. 1A is a schematic diagram showing an image formed by the data, and FIG. 1B is a block diagram showing the data recording order.

FIG. 1A shows the screen 31 of the receiver with the peripheral area 32 and central area 33.
The center part 33 is divided into the frame memory 8 as shown in FIG.
．． 9, and the peripheral section 32 is allocated to the frame memories to, t.
It was designed to be shared by i.

As shown in FIG. 1A, the screen 31 has 243 lines and 764 pixels per line. Further, the left end of the center portion 33 is located 129 pixels from the left side of the screen 31, and the right end is located 640 pixels from the left side of the screen 31. Further, the upper end of the center portion 33 is located at a position of 26 lines from the upper end of the screen 31, and the lower end is located at a position of 217 lines. Therefore, the central part 3
3 has 512 pixels in the horizontal direction and 192 lines in the vertical direction.

Now, as shown in FIG. 1A, pixels are arranged from the upper left corner to the lower right corner on the screen 31 as shown by circles. Among these pixels, each pixel P in the peripheral area 32 has P+ + P t
Attach a series of numbers such as r-Psy+4a, and attach the central part 33.
A series of numbers are assigned to each pixel Q such as Q, , Q, . . . -Q983°4.

On the optical disc 1, a luminance signal Y is given to each of these pixels P and Q, and a common 2 luminance signal is given to two adjacent pixels.
Two color difference signals RY and BY are provided. These three types of pixel data are each recorded as linear quantized data of 8 bits in sequence as shown in FIG. 1B.

That is, as shown in FIG. 1B, on this optical disc 1, among the pixels Q in the center part 33 of the - images, odd numbered pixels Q,
, Q3. - pixel data is first recorded as the first block 201 together with the data division signal 101, and then odd numbered pixels P+, P3 of each pixel P in the peripheral area 32 are recorded as the first block 201.
．． - pixel data is recorded as the second block 202 together with the data division signal 102, and then the central part 33
The pixel data of the even numbered pixels Q2, Q<, - are recorded together with the data division signal 103 as the third block 203, and finally the even numbered pixels P, .
P4. -.- pixel data are recorded as the fourth block 204 together with the data classification signal 104. All other images are recorded block by block in the same order. Therefore, reading of each pixel data from the optical disc 1 is also performed in this order.

Figure 3 shows pixel data for each pixel P, , P, - in the peripheral area 32 and each pixel Q, , Q2, - in the central area 33. Signal Y+
, Yz'- are indicated by the serial numbers attached to each of the pixels P and Q. In general, the resolution of the color difference signal may be lower than that of the luminance signal, so the 8-bit color difference signal R-
Y, B-Y are (R-Y)fi one by one for the luminance signals Y7゜Yfi+1 of two adjacent pixels, where n is an odd number.
, (BY)fi. Therefore, the color difference signals R-Y and B-Y are as shown in FIG. 3B and C, with every other data (RY)+, (RY)3.・-・and (BY
) r, (B Y) 3, - are used.

The operation of the above configuration will be explained with reference to the drawings of FIGS. 1 to 9.

To read a desired image from the optical disc l on which a large number of images have been recorded as described above, the image number corresponding to the desired image is input using an image selection key (not shown). The image data of the number selected in this way is read from the optical disk 1 by the playback device shown in FIG. 8.10.9
It is recorded in the order of ゜11.

Therefore, frame memories 8 and 9 each have a central portion 3.
3, odd numbered and even numbered pixel data are recorded, and odd numbered and even numbered pixel data of the peripheral portion 32 are recorded in the frame memories 10 and 11, respectively.

Here, as shown in FIG. 4A, the frame memories 8 and 10 contain adjacent odd-numbered luminance signals Y7 and Yn+2.
, (Yl, yi), (ys, Yff
)-, the combinations D, %D, . . . are assigned to the lower 8 bits and upper 8 bits, respectively, and are sequentially recorded as a set of 16-bit data.

In addition, two color difference signals (R-Y
)fi and (t3-Y), , are combined in the same way as the luminance signal and assigned to the lower 8 bits and upper 8 bits of the 16-bit data D0 to DI5, respectively, to form a set of 16-bit data, and the luminance signal (Y , , Y-z).

In this way, the frame memories 8 and 10 store pixel data for odd-numbered pixels on the screen 31, as shown in FIG. 4A.
Y) I+ (B Y) +, Y+, Y3.

(RY) s, (B-Y) S+Y, +Y7+'-
are arranged sequentially.

The frame memories 9 and 11 also include the frame memory 8.
And as in the case of 10, in 16-bit units, the pixel data for even-numbered pixels is (RY
) :+, (B Y) 3. Y2.

Y4= (RY)? + (B Y) qlYb, Y
a, -.

A launch circuit that reads out these pixel data and generates an image signal corresponding to the above screen division will be explained.

Since the optical disc 1 has odd-numbered pixel data in the center portion 33 recorded at the beginning as described above, the CPU 5 first generates a write address 14 so as to record this pixel data in the frame memory 8.

When all of this recording is completed, the CPU 5 reads the pixel data from the frame memory 8 using the read address from the read address generator 12.

As shown in the upper and lower rows of FIG. 5A, the color difference signal and luminance signal data of the central odd-numbered pixels recorded in units of 16 bits as shown in FIG. The signals are output from the output ends 8a and 8b of the frame memory 8.

That is, the luminance signals Y are (Yl, Y3), (Ys).

Y? )'--- and two odd-numbered pixel data are read out in parallel to the output terminals 8a and 8b, respectively, and the color difference signals R-Y and BY are also ((RY)+, (BY)
I), ((RY)s, (B-Y)s)
Two odd-numbered pixel data are read out in parallel to the output terminals 8a and 8b, respectively, as shown in FIG. 5A.
The luminance signal and two color difference signals are output alternately in this order.

In the R-Y latch circuit 8j15 and the B-Y latch circuit 18, at the rising edge 34 of the launch pulse shown in FIG.

and color difference signal (B-Y) I+ (B-Y) 5. - is latched as shown in FIG. 5G.

In addition, Yゎ, Y, l+2 latch circuit 21゜2 for luminance signal
2, the rise 35 of the launch pulse shown in FIG.
and two luminance signals (Yl, Y3).

(Y5, Y7) and - data are latched at the same time. The data latched in each of the latch circuits 21 and 22 is Yfi shown in FIG. 5H. The low level portion of the 2 output control pulse and the low level portion of the Yfi output control pulse shown in FIG.
7 and Y7.2 output timing is controlled,
5 Luminance signals Y7 and Y where n is an odd number as shown in FIG.
. , 2 are arranged in series with a period of 1//2f9c.

In order to match the luminance signal Y shown in FIG. 5, it is latched at the rising edge 35 of the latch pulse shown in FIG.
As shown in the figure, the signal is delayed by τ·1/2 fsc and is output at the low level portion of the color difference signal output control pulse shown in the fifth figure. In this way, the two color difference signals RY and BY are outputted from the latch circuits 16 and 19 in the arrangement shown in FIG. 5H, respectively.

The color difference signal data and luminance signal data arranged in this manner are supplied to D/AI 7.20 and 23 and converted into analog signals.

As mentioned above, the D/A 23 for the luminance signal Y and the color difference signal R-Y
, from the output terminal of the D/A 17.20 for B-Y, the odd numbers (1 for Y) of the pixel data in the center part 33 are first output.
, 3.5-1R-Y, B-Y is 1.5, 9.13・-
The pixel data of ) is supplied to a well-known matrix circuit 30, and color signals R, G.

You can get B. Therefore, first, the image of the central portion 33 in FIG. 3A is displayed coarsely, so that the outline of the image can be confirmed in a short time.

After that, when all the odd numbered pixel data of the peripheral part 32 recorded on the optical disc 1 is written to the frame memory lO, this data is outputted to the output terminals 10a and lQb, and is exactly the same as the image reproduction of the central part 33 described above. As a result, the image of the peripheral area 32 is displayed coarsely.

In this way, the odd numbered pixel data of the screen 31 is read out from the optical disc 1, and after this is displayed, the even numbered pixel data of the central part 33 is read out from the optical disc 1 in the same manner as described above, and is first read out from the frame memory. Recording begins at 9. When this recording is completed, the even numbered pixel data is read out from the frame memory 9 together with the odd numbered pixel data, and the peripheral part 32 is displayed coarsely and the central part 33 is displayed with high definition. Finally, the even numbered pixel data of the peripheral portion 32 from the optical disc 1 is written into the frame memory 11 and read out together with the odd numbered pixel data, so that the entire screen 31 is displayed in high definition.

A case where the pixel data of the frame memories 8, 9, 10.degree. 11 are finally displayed simultaneously in this order will be explained with reference to FIG.

FIG. 6A, like FIG. 5A, shows an arrangement diagram of odd numbered pixel data read out from the frame memory 8. 8b and 10b are shown. FIG. 6B is an array diagram of even-numbered pixel data read out from the frame memory 9.11, and the upper row shows the output end 9a,
11a, and the lower stage is the output terminal 9b, Ilb.
It shows what appears in

Among the pixel data read out from the frame memories 8, 9, 10.11, the color difference signal RY is output from the latch circuit 15. J
! Then, by the rising edge 34 of the latch pulse shown in FIG. 6C, the signal is latched as shown in the first and third stages of FIG. The color difference signal B-Y is latched by the latch circuit 18.26 as shown in the second and fourth stages of FIG. 6 at the rising edge 34 of the latch pulse shown in FIG. 6C. Figure 6 K
The outputs of the color difference signal R-Y latch circuit 15.24 and the B-Y latch circuit 18.26 shown in FIG.
Launch circuits 16, 19,
25 and 27, is latched at the rising edge 35 of the latch pulse shown in the sixth diagram, and is delayed by a time τ=time as shown in the sixth diagram.

The timing of the output control pulses of the launch circuits 16 and 19, which receive odd-numbered pixel data, is as shown in the low-level portion of FIG. 6E, and the timing of the output control pulses of the launch circuits 25 and 27, which receive even-numbered pixel data. is shifted by < 1/2 fsc as in the low level part of FIG. 6F. Therefore, the output data of the launch circuit 16.25 and the output data of the launch circuit 19.27 are alternately outputted in the correct order as shown in the upper and lower rows of FIG. 6M, respectively.

Next, as for the luminance signal, as shown in FIGS. 6A and 6B, two luminance signals are simultaneously read out for each of the odd numbered and even numbered pixels. Two luminance signals Y, , Y, where n is an odd number
, and 2, the launch circuits 21 and 22 for odd-numbered pixels are activated by the rising edge 35 of the latch pulse shown in the sixth diagram.
Then, it is latched as shown in the upper part of FIG. 6N. Further, the two luminance signal data Yn+Y11+2 where n is an even number are latched by the even-numbered pixel launch circuits 28 and 29 as shown in the lower part of FIG. 6N. FIG. 6 G is an even numbered luminance signal Y
Output control pulse of latch circuit 29 for 7 and 2, FIG. 6H shows latch circuit 2 for odd numbered luminance signals Y7 and 2.
6.1 is the output control pulse of the launch circuit 281 for the even numbered luminance signal Y7, and FIG. 6J is the output control pulse of the launch circuit 21 for the odd numbered luminance signal Yn. . The luminance signal Y latched in the latch circuit 21, 22, 28, 29 in this way is changed from Y, l output of the latch circuit 21 to Yfi output of the launch circuit 28 to the latch circuit 22 by the output control pulses shifted by 1/4 fsc from each other. The Y n 4 N output of the latch circuit 29 is switched in the cycle of the Y02 output of the latch circuit 29, and a brightness signal with the correct data arrangement shown in FIG. 6P is obtained.

If even-numbered pixel data is read out and displayed at the same time as odd-numbered pixel data in this way, the frame memory 8°9 simultaneously reads out the central part 33 of the screen 31, and the central part 33 is filled with odd-numbered pixels and High-definition pixels are displayed using an even number of pixels. Next, the even-numbered pixel data of the peripheral area 32 is recorded in the frame memory 11, and after this recording is completed, this even-numbered pixel data is read out simultaneously with the odd-numbered pixel data as described above, and the peripheral area is also high-definition. The image will be played.

In this way, from the optical disc 1 to the frame memory 8°10.
By writing and reading in this order to 9.11,
The screen 31 shown in FIG. 1A is displayed in stages from the central part 33 to the peripheral part 32, and finally the screen 31 becomes high-definition.

In this case, the time it takes to complete a high-definition image is determined by the transfer rate of the filing device, and it takes a long time as before, but since a rough image is displayed early on the screen, the screen must be recognized by VfI. The actual waiting time is extremely short and you won't have to worry about it.

In this embodiment, by using the procedure shown in the flowchart of FIG. 9, it is possible to end the reproduction while the image is being completed step by step as described above, and to reproduce another image.

That is, first, when the setting of image number N is detected as described above, (
FI), first block 2 of image number N from optical disc 1
The pixel data of 01 is transferred (F2), and a rough image in the center portion 33 is reproduced.

If no operation is performed here, the CPU 5 determines that this is the desired image (F3). When the operator operates a screen forwarding key (not shown), it is determined that the image is not the desired one, and the CPU 5 resets the image number N to N+1 (Fll). If it is the desired image (F3),
When you operate the screen enlargement key (F4), the second image number N
The pixel data of the block is also transferred (F,), and a rough image of the entire screen 31 is reproduced. If no fixed key is operated here (F6), the pixel data of the third block will be further transferred (F?), and the peripheral part 32 will be coarsely divided into the central part 3.
3 is reproduced in high definition. If the fixed key is not operated here (Fll), the pixel data of the fourth and final block is transferred (F9), and a high-definition image of the entire screen 31 is reproduced.

In step F4, if the screen enlargement key is not operated, the process does not proceed to step F and the coarse screen in the center 33 continues to be played, but if the fixed key is not operated at this point (
FIZ), the optical pickup for reproducing image data from the optical disk 1 skips block 2 and transfers the pixel data of block 3 to the frame memory 9 (F13), central part 3
Only 3 high-definition images are reproduced.

In step F9 or step FI3, when the screen forwarding key is operated after the high-definition image is reproduced (FIG), the image number N is updated to N+1 (F, 1), and a new image is reproduced. When a fixed key is operated in steps Fa, Fe, or FI2, the subsequent steps are skipped and the process moves to step FIG, and if no operation is performed here, the images that have been reproduced up to that point continue to be reproduced.

Note that, for example, the screen 31 can be divided not only into the two stages of the central part 33 and the peripheral part 32, but also by providing a plurality of stages in between, thereby making the stages leading to the completion of the image finer. Also, regarding the definition of the image, it may be odd or even (not limited to taking out every other image and displaying it in two stages, but may take out every second picture and displaying it in three stages).

In this case, the image data may be divided into a large number of blocks corresponding to this stage and recorded on the optical disc 1 in accordance with the playback order. Also, the frame memory may be prepared for each stage.

Note that even number pixel data is recorded next to odd number pixel data on the optical disc 1 described above, but on the contrary, odd number pixel data may be recorded after even number pixel data. In this case, even-numbered pixel data is read out first to create a rough screen.

In order to display a coarse screen with even-numbered pixels like this, the CPU 5 and read address generator 12 generate write addresses and read addresses, respectively, select them with the address selector 13, and first store them in the frame memories 9 and 11. Data is written to and read from the optical disc l.

A data array diagram in this case is shown in FIG. 7A-1. This operation is the same as that shown in FIG. 5, except that the extraction position of pixel data from the screen 31 changes (L'j-), which is not shown in FIG. It will be similar to Figure 5.

Note that FIGS. 2A and 2B show other examples of how to divide the screen 31, and show the case where the screen is divided into three parts horizontally and vertically, respectively. In this case as well, the data arrangement on the disk is the same as that shown in FIG. The odd-numbered pixels and even-numbered pixels may be assigned to the frame memories 10 and 11, respectively.

〔Effect of the invention〕

As described above, according to the recording medium according to the present invention, an image can be completed in stages from a coarse screen to a high-definition screen, or from a specific part to other parts. Therefore, you can get an overview of the image at an early stage, and if you do not need to see any more images, you can move on to searching for the next image at an early stage, reducing the time it takes to search for images. I can do it.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a recording medium according to the present invention, and FIG. 1A is a conceptual diagram of an image reproduced from recorded data.
Figure B is a block diagram showing the data structure on the recording medium.
The figure is a front view of a screen obtained by another embodiment of the recording medium according to the present invention, Figure 3 is a data array diagram showing the correspondence between each pixel number and pixel data, and Figure 4 is a diagram showing each frame from an optical disk. FIG. 5 is a diagram of the data array read from the frame memory for odd-numbered pixels; FIG. 6 is a diagram of the data array read from the frame memory when reproducing a high-definition image; FIG. The figure is a readout data array diagram of even-numbered pixels from the above frame memory,
FIG. 8 is a system diagram showing an embodiment of an image reproducing apparatus for reproducing images from a recording medium according to the present invention, and FIG. 9 is a flowchart showing a control operation of a CPU used in the reproducing apparatus of FIG. 1... Optical disk 5... CPU 8, 9.10.11... Frame memory 15.16.
1B, 19.21, 22, 24, 25.26, 27, 2
8.29...Latch circuit 31...Screen 32...Peripheral part 33...Central part

Claims (1)

[Claims] In a recording medium on which image data of a plurality of images are recorded, the image data of each of the plurality of images is a first, a second,
The remaining pixel data obtained by thinning out some pixel data of the image data displaying a specific part of the image is recorded in the first area, and the remaining pixel data is recorded in the second area. The remaining pixel data obtained by thinning out some pixel data of the image data that displays a part other than the specific part of the image is recorded in the area, and the third area displays the specific part of the image. The pixel data of the thinned out part of the image data to be displayed is recorded in the fourth area, and the pixel data of the thinned out part of the image data that displays a part other than the specific part of the image is recorded. A recording medium on which pixel data is recorded.