JPS61275985A - Image information reproducing device - Google Patents

Abstract

PURPOSE:To prevent the generation of waiting time during a scroll operation by displaying a display area smaller than an area of the data, making access to one or both of an X series and a Y series to obtain a supplemental data and performing the scroll operation. CONSTITUTION:By a signal form an input device 13, a scroll direction is detected and when it is a vertical direction, block numbers of the data to be supplied upward or a downward from the present display area are obtained, the data in an X series recorded in an area 20X of a compact disk 1 is sought and the reproduced data is transferred to a graphic display processor 9. When the scroll direction is a horizontal direction, the number of the block of the data to be supplied rightward or leftward is obtained, the data in a Y series recorded in an area 20Y is sought and the reproduced data is transferred to the processor 9. When the scroll direction is oblique, similarly to the vertical and horizontal scrolling, the supplemental data are reproduced and transferred to the processor 9. During a horizontal blanking period, the data are written in a non-display area of the image memory.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image information reproducing apparatus commonly used for storing and reproducing digital image signals using, for example, an optical disk.

[Summary of the invention]

This invention records image information such as a map on an optical disc,
An image information reproducing device that reproduces this image information divides the image information into (N x M) blocks in a mosaic pattern, and divides the image information into an
The Y series, which consists of a mosaic continuous in the direction, is separated and recorded so that it can be played back, and a display area smaller than the data area is displayed, and one or both of the X series and Y series can be accessed to create supplementary data. By obtaining these values, scrolling operations can be performed at high speed vertically, horizontally, or diagonally.

[Conventional technology]

Compact discs are known that record digital audio signals as pits and lands on the trunk of the disc. Still image data,
It has been considered to store compressed audio data, digital data, etc. and use it as a large-capacity file, and data formats for this purpose have been proposed.

This data format allows random access with 2316 bytes as one block. When reading one block continuously, one block can be read every 1/75 seconds. However, when randomly accessing blocks, a seek time of about 1 second is required.

[Problem that the invention seeks to solve]

Although compact disks have a large capacity of memory, they have long seek times during random access.

Consider the case of graphics on a compact disc having, for example, (512x512) pixels and 4 bits per pixel. If 2048 bytes of pixel data are used in one block, the amount of data that can be recorded as one sector in the data format is 2316 bytes, so one area is (512x512x4)/(2048x8).
- Consists of 64 blocks.

In the case of maps, etc., part of a very large screen can be used as a CRT.
A window function to display on the display is required. However, when using a compact disc recorded as described above, when attempting to scroll in any direction, new data is replenished from the compact disc, requiring frequent random access. As mentioned above, compact discs have a long seek time, so the runner-up is that the waiting time during scrolling operations is long.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an image information reproducing apparatus in which waiting time during scrolling operation is prevented from occurring.

[Means for solving problems]

In this invention, image information to be displayed is blocked by block B.
(m, n) is divided into (N×M) mosaics to form an X series consisting of mosaics continuous in the X direction and a Y series consisting of mosaics continuous in the Y direction. In an image information reproducing device that reproduces a recording medium in which sequences are recorded separately and reproducibly, a display consisting of (J×K) mosaics (where (1<J<N) (1<K<M) This image information reproducing apparatus is characterized in that it displays an area, accesses one or both of an X series and a Y series from a recording medium to obtain supplementary data, and performs a scrolling operation.

[Effect]

An X-direction series (X-series) and a Y-direction series (Y-series) of blocks of image information divided into a mosaic are recorded in different areas of one compact disc. During playback, when scrolling up and down, image information is played from the X-series area, and when scrolling left and right, image information is played from the Y-series area, and diagonally. When scrolling in the direction, replenish from both the X series and the Y series. Therefore, the random access operation for scrolling only needs to be performed once or twice, and there is no need to perform the random access operation frequently.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. The order of explanation will be according to the items listed below.

a. Overall configuration, data configuration C. Recorded data on the compact disc d. Control of scrolling operation of the system controller 2 e. Explanation of the graphic display processor 9 f. Explanation of the address generation circuit 29 g. Explanation of the scroll circuit. , Modification A, Overall Structure The overall structure of an embodiment of the present invention will be described with reference to FIG. In FIG. 1, 1 indicates a compact disk, and the compact disk 1 is rotated by a spindle motor 2. As shown in FIG. A signal reproduced from the compact disc 1 by an optical head shown at 3 is supplied to a demodulation circuit 4.

The signal recorded on the compact disc 1 is an EFM modulated signal that converts 1-bit 8 symbols into a 14-bit preferable pattern (with less DC component).

Therefore, the reproduced signal is subjected to EFM demodulation processing by the demodulation circuit 4. Main data (graphic data) from demodulation circuit 4 is supplied to error correction circuit 5, and subcode 14 is supplied to system controller 12.

The subcodes have divisions at a period of 98 frames and are used to control disc playback, display related information, etc., and are divided into P, Q, R, S, T, U, V.

It has 8 channels of W. Currently, standards have been established for the P channel and Q channel. P
A channel is a flag indicating a pause and music,
A low level is set for music, a high level is set for a pause, and a 2 Hz pulse is set for the lead-out section. Therefore, by detecting and counting the P channels, it becomes possible to select and reproduce designated music. The Q channel allows for more complex control of the same type,
For example, Q channel information can be imported into a microcomputer provided in a disc playback device, and random music selection can be performed, such as immediately switching to another piece of music even in the middle of music playback. The other R channels to W channels are used to display the composer of the music recorded on the disc, their explanations, poems, etc., and to provide audio explanations.

Of the 98 bits of the Q channel, the first 2 bits are used as a sync pattern, the next 4 bits are used as control bits, the next 4 bits are used as address pits, and the next 72 bits are used as data bits. , a CRC code for error detection is added at the end. A track number code TNR and an index code X are included in the 72 data bits. Since the track number code TNR can vary from 00 to 99, the index code X can similarly vary from OO to 99. Furthermore, the Q channel data includes a time display code that indicates song and pause times, and a time display code that displays an absolute time that changes continuously from the beginning of the program area of the compact disc to the end of the outermost circumference. It will be done.

Each of these time display codes is a two-digit minute and second.

Consists of frame code. One second is divided into 75 frames. In order to access a compact disc in units shorter than music, such as digital data, the above-mentioned time display code related to absolute time is used.

In this embodiment, digital data is recorded as main channel data, but the data structure of the P channel and Q channel of the sub-coding signal is the same as that of a compact disc.

The error correction circuit 5 performs error correction on the main digital data and supplies it to the synchronization detection circuit 6. In the synchronization detection circuit 6, a frame synchronization signal is detected. The output of this synchronization detection circuit 6 is supplied to a buffer memory 7 having a capacity for one block and a control circuit 8.

Further, a control signal from the system controller 12 is supplied to the servo circuit 11. The servo circuit 11 includes a motor servo circuit that rotates the spindle motor 2 at a constant linear velocity, a servo circuit that controls focusing and tracking of the optical head 3, and a sled drive circuit that controls the movement of the optical head 3 in the disk radial direction. include. Associated with the system controller 12 is an input device 13, such as a mouse. An input device 13 is provided to move the window to a desired display position.

A start address 18 and scroll command 19 generated by the system controller 12 are supplied to a graphic display processor 9, which will be described later. Graphic display processor 9 is supplied with digital data 15 read from buffer memory 7 and an enable signal 16 from control circuit 8 . Further, a read clock 17 is supplied from the graphic display processor 9 to the control circuit 8 .

The graph ink display processor 9 generates three primary color signals R, G, and B, a horizontal synchronization signal HD, and a vertical synchronization signal VD.
is formed. These signals are transmitted to the display device 10.
For example, the display area of the data supplied to the RGB monitor and recorded on the compact disc 1 is displayed.

b. Data Structure A part of the data recorded on the compact disc 1 is displayed on the screen of the display device 10.

FIG. 2 shows the memory area of the image memory provided in the graphic display processor 9 and the display area of the display device 10.

The memory area is 512 dots horizontally and 512 dots vertically.
It is said to be a line. (448X
448) The pixel area is set as the display area. Therefore, a non-display area of 64 pixels is generated in both the vertical and horizontal directions. Also,(
An area of 64×64) pixels is defined as a block. Therefore,
The memory area is mosaic-divided into 64 (8x8) blocks. Furthermore, the virtual screen recorded on compact disc 1 is (512 dots x 32)
(512 lines x 32). Therefore, the total number of blocks on the virtual screen is (8X32)X(8X32)-6
This results in 5,536 blocks. Also, if one pixel is 4 bits for 16 color display (or 16 gradation display),
One block consisting of one mosaic has a data amount of 2048 bytes.

This one block of data is recorded according to the previously proposed digital data recording format. In this recording format, (588 x 4 bytes = 235
2 bytes) as one sector. One sector consists of a 12-byte sector synchronization signal, a 4-byte header, 2048-byte data (user data), a 4-byte error detection code such as a CRC code, an 8-byte extension space, and 172 bytes. The parity of the P code (referred to as P parity) and the parity of the 104-byte Q code
(referred to as Q parity). These P codes and Q codes are error correction codes. One sector is configured so that only the data that is ultimately needed can be extracted.

FIG. 3 shows the configuration of one sector in more detail.

In Figure 3, the left channel and right channel indicate the correspondence with the sample data of the left and right channels of stereo music data, each channel has 16 bits as one word, L is the least significant bit, M is the most significant bit. Showing bits. In the case of stereo music data, data of (6X2X2-24 bytes) is recorded within the interval specified by the frame synchronization signal, so if digital data is recorded in the same signal format as stereo sound and music data, One block (2352 bytes) is recorded from the Oth frame to the 97th frame.

Therefore, digital data can be recorded without destroying the 98 frames of the period of change of the sub-coding signal.

The first byte of one block of digital data is all 0 bits, the next 10 bytes are all 1 bits, and the next 1 byte is all 0 bits. This 12-byte section is used as a sector synchronization signal indicating the beginning of one block of digital data. After the sector synchronization signal, a 1-byte header for minutes, 1 second, sector, and mode is added.

This header is the address of one sector, and one sector is 75 sectors and corresponds to one second, similar to a frame. The mode data indicates the type of data in the l sector. In Figure 3, D0001 to D2B6
indicates the byte number of one sector excluding the sector synchronization signal and header.

D0001 to D2048 are user data (graphic data in this embodiment), and D2049 to D2048 are user data (graphic data in this embodiment).
2052 is the error detection code, D2053~02
060 is a space, and D2061 to D2232 are P
This is parity, and D22B to D2B6 are Q parity.

C. Compact disc recording data As mentioned above, each sector of a compact disc has one
It contains graphic data of blocks, and the playback time of 75 sectors is 1 second. Therefore, when using a compact disc with a playback time of 60 minutes, the playback time per disc is 75 minutes.
It can record digital data in the amount of x3600-270° OOO sectors. The total number of blocks (65,536 blocks) on the virtual screen in this embodiment occupies approximately 1/4 of the amount of data that can be recorded on one compact disc.

The order of data when recording virtual screen data on the compact disc 1 will be explained with reference to FIG. 4. FIG. 4 shows a case where the virtual screen is generally composed of N blocks in the vertical direction and M blocks in the horizontal direction. Each block contains B(0,O)...B(N-
1, M-1) block numbers are assigned. However, in FIG. 4, the display of B is omitted for the sake of illustration.

Series B of blocks located in order in the horizontal direction of the virtual screen shown in FIG. 4 (0, O) B (0, 1) . . . B
(0,M-1)B (1,O) ...B (N-2
, M-2)B (N-1, M-1) is an X series, and a series of blocks sequentially located in the vertical direction B(0°0)B (
1,O)B (2,O) ...B(N-1゜0)
Let B (0, 1)...B (N-1, M-1) be the X sequence. These X series and X series are recorded separately on the compact disc 1 so as to be reproducible. In this embodiment, as shown in FIG. 5, an X-series area 20X is provided inside the program area of the compact disc 1, and an X-series area 20Y is provided outside thereof.

d. Control of the scrolling operation of the system controller 12 In one embodiment of the present invention, some (7) of the virtual screen
When scrolling up and down while displaying the area (X7-49 block), insert a compact disc into the hidden area of 7 blocks above or below the memory area.
What is necessary is to load the supplementary data from , and then display the display area data including this supplementary data. Also, when performing left/right scrolling, the 7 on the left or right side of the memory area
It is sufficient to load the supplementary data from the compact disc 1 into the non-display area corresponding to the block, and then display the data in the display area containing this supplementary data. Furthermore, when performing diagonal scrolling, supplementary data is loaded into both the upper or lower non-display area and the left or right non-display area. When playing supplementary data from Compact Disc 1,
By accessing the X-series area 20X and/or the X-series area 20Y depending on the direction of scrolling, the seek operation can be completed once or at most twice.

FIG. 6 is a flowchart showing the control operation of the system controller 12 during scrolling.

The scroll direction is detected by a signal from the input device 13. In the case of vertical scrolling, the block number of the data to be replenished above or below is determined from the current display area (step 2).

Next, the data of the first block number of the obtained block numbers in the X series recorded in the area 20X of the compact disc 1 is sought (step 2). This seek operation is performed based on the address in the reproduced subcode and the sector address in the reproduced data. Seven consecutive blocks starting from the sought block number are played back from the compact disc 1, and this playback data is transferred to the graphic display processor 9 (
Step ■). Next, a command to scroll up or down 64 lines is issued to the graphic display processor 9 (step 2).

Also, when the scroll direction is left or right, the block number of the data to be replenished on the left or right is determined (step
), the data of the first block number of the obtained block numbers in the X series recorded in the area 20Y of the compact disc 1 is sought (Step 2). Seven consecutive blocks starting from the sought block number are played back, and this playback data is transferred to the graphic display processor 9 (step 0). Next, a 64-dot left or right scroll command is issued to the graphic display processor 9 (step [phase]).

Furthermore, when the scrolling direction is diagonal, supplementary data is reproduced in the same way as step ■■■ for vertical scrolling, this reproduced data is transferred to the graphic display processor 9, and then step ■■ for horizontal scrolling is performed. Supplementary data is reproduced in the same manner as in 0, and this reproduced data is transferred to the graphics display processor 9. Then, an up or down scroll command is issued to the graph ink display processor 9 (step ■), and a left or right scroll command is issued (step @l).

e. Description of Graphic Display Processor 9 FIG. 7 shows the configuration of the graphic display processor 9. In FIG. 7, 21 is a dynamic RAM.
This is an image memory configured by This image memory 2
1 has a memory capacity of (65KX4X14). 8-bit parallel digital data from buffer memory 7 is taken into latch 22 . Each four bits of the output of the latch 22 are taken out alternately by gate circuits 23 and 24 and input to the image memory 21.

A color lookup table 25 in which graphic data read out from the image memory 21 is configured in a ROM, etc.
supplied to The color lookup table 25 outputs each color signal (4 bits each) of the three primary color signals corresponding to the color of the pixel, and each color signal is sent to the D/A converters 26 and 2.
Delivered on 7.28. This D/A converter 26.2
Red, green, and blue color signals are output from each of 7.28 and 7.28, respectively.

30 indicates a clock generation circuit, and the clock generation circuit 3
0 is supplied with an enable signal 16 from the control circuit 8.

The enable signal 16 indicates that one block of reproduced data has been stored in the buffer memory 7. Clock generation circuit 30 generates a read clock for reading data from buffer memory 7 in response to enable signal 16 . The clock generation circuit 30 also includes a latch 22
A latch pulse and a write clock for the address generation circuit 29 are generated.

The address generation circuit 29 generates an 18-bit address ADR.
It also generates a horizontal synchronizing signal HD and a vertical synchronizing signal VD.

Eight bits each of the row address and column address are sequentially selected by the multiplexer 31 and used as address inputs to the image memory 21. Also, the top 2 addresses ADR
The bits are supplied to shift register 32 to form a four-phase column address strobe signal CAS. Four dynamic RAMs are operated in a time-division manner by this column address strobe signal CAS. The row address strobe signal RAS is shared by 1.4 dynamic RAMs.

As shown in FIG. 8, the image memory 21 performs a write operation during the horizontal blanking period of one horizontal scanning period, and performs a read operation during the horizontal scanning period. During the horizontal scanning period, graphic data in the display area of the image memory 21 is read out, and a color image is displayed on the display device 10. During scrolling, supplementary data is written into the non-display area of the image memory 21 during the horizontal blanking period.

f. Description of address generation circuit 29 The address generation circuit 29 will be explained with reference to FIG. In FIG. 9, 41 is an address selector that outputs a column address, and 42 is an address selector that outputs a row address.

A counter 43 is connected to one input of the address selector 41.
and 6 bits and 3 bits from latch 46 (needle 9
bit) column address is supplied. One input of the address selector 42 has a counter 44 and a latch 4.
A total of 9 bits of row address is supplied from each of 7.

These addresses are write addresses. Both counters 43 and 44 are connected in cascade, and a write clock is supplied from terminal 45 to this cascade connection. latch 4
6 and 47 contain the start address 18 from the system controller 12.

The other input of the address selector 41 has a counter 48
A 9-bit column address is supplied from . The other input of the address selector 42 is supplied with a 9-bit row address from the counter 49. These counters 4
8 and 49 are connected in cascade, and a reference clock from a clock oscillator 50 is supplied to this cascade connection. Each of counters 48 and 49 generates a read address.

Address selectors 41 and 42 are controlled by a write/read control signal from terminal 51, and a write address is selected during a write operation, and a read address is selected during a read operation. A column address is an address in the horizontal direction, and a row address is an address in the vertical direction. Therefore, the output of the counter 48 is taken out as the horizontal synchronizing signal HD, and the output of the counter 49 is taken out as the vertical synchronizing signal VD.

The column address from address selector 41 is supplied to scroll circuit 52, and the row address from address selector 42 is supplied to scroll circuit 53. A scroll command 9 from the system controller 12 is supplied to each of the scroll circuits 52 and 53. Addresses input to scroll circuits 52 and 53 are logical addresses corresponding to positions on the screen, and addresses output from these are physical addresses to image memory 21.

g. Description of Scroll Circuit Both scroll circuits 52 and 53 have the same configuration. For horizontal scrolling, scroll circuit 5
This is done by supplying a scroll command to 2 and changing the horizontal address. Scrolling in the vertical direction is performed by supplying a scroll command to the scroll circuit 53 and changing the address in the vertical direction.

FIG. 10 shows the configuration of the scroll circuit 53.

The row address from the address selector 42 is supplied from a terminal 61 to one input terminal of an adder circuit 62, and the adder circuit 62 generates a 9-bit address ADR. The output of the multiplexer 72, that is, the data of the shift amount of the logical address is supplied to the other input terminal of the adder circuit 62.

The multiplexer 72 is switched by a write/read control signal from a terminal 73.

One input terminal 64 of the adder circuit 63 is supplied with periodically generated +1 or -1 data.

These numbers correspond to the upper and lower sides in the scrolling direction. The output of adder circuit 63 is supplied to latch 65. A 60 Hz latch pulse is supplied to the latch 65. The output of latch 65 is used as one input of comparator circuit 67. The output of this comparison circuit 67 is supplied to the latch 65 as its latch enable signal.

The other input of comparison circuit 67 is supplied from latch 70. This latch 70 is supplied with a scroll command from a terminal 71. The adder circuit 68 is supplied with +64 or -64 data from the terminal 69 and the output of the latch 70, and the output of the adder circuit 68 is supplied to the latch 70. Corresponds to the bottom.

When writing supplementary data into the image memory 21 during a scroll operation, the latch 70 latches the output of the adder circuit 68 in response to a scroll command.

The output of adder circuit 68 is the previous value plus +64 or -64. The output of the latch 70 is supplied to the comparison circuit 67, and +1 or -1 data is supplied from the terminal 64 to the addition circuit 63. While the contents of the lunch 65 change by +64 or -64, the output of the adder circuit 63 is latched into the latch 65 every 1/60 seconds. At the time of reading, the output of this latch 65 is supplied to the adder circuit 62 via the multiplexer 72. Therefore, the read address of the image memory 21 changes sequentially, and a scrolling operation is performed. When the amount of change in the address reaches 64, the enable signal supplied from the comparator circuit 67 to the latch 65 becomes high level, and the latch 65 is disabled. During writing, the output of latch 70 is supplied to adder circuit 62 via multiplexer 72.

h. Modified Example A method for dividing blocks of image data may be such that a plurality of sectors are combined into one block instead of a one-to-one correspondence between l blocks and sectors.

When recording the X series and Y series on a compact disc, they may be recorded in a time-division manner.

Further, the screen configuration and the number of bits per pixel are also arbitrary.

Furthermore, the data structure within a block is not limited to a bitmap, but can also be a differential encoding method between adjacent pixels, a differential encoding method between lines, or a run-length encoding method.

A PDI code or the like can be used.

〔Effect of the invention〕

According to this invention, image information is divided into blocks into mosaics, and an X series consisting of mosaics continuous in the X direction and a Y series consisting of mosaics continuous in the Y direction are separated on a recording medium. Since it is recorded so that it can be played back by
One or both of the series and Y series can be accessed to obtain supplementary data. Therefore, the seek operation only needs to be performed once or twice, and it is possible to prevent the occurrence of waiting time during the scroll operation.

It is also possible to scroll in any direction on a very large virtual screen using only a small amount of image memory.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention, FIG. 2 is a route diagram used to explain the memory area of the embodiment of the invention, and FIG. 3 is a block diagram of the embodiment of the invention. A route map showing the structure of one block of data; FIG. 4 is a route map used to explain the block arrangement in an embodiment of the present invention;
FIG. 5 is a route map used to explain the data recording method in one embodiment of the present invention, FIG. 6 is a flowchart used to explain the control for scrolling in one embodiment of the present invention, and FIG. FIG. 8 is a waveform diagram for explaining the operation of the image memory; FIG. 9 is a block diagram of the address generation circuit; and FIG. 10 is a block diagram of the scroll circuit. be. Explanation of main symbols in the drawings 1: Compact disk, 3: Optical head. 9 Nigelough Ink Display Processor. 10: Display device, 12 System controller, 13: Input device, 20X: X-series recording area, 20Y: Y-series recording area. 21: Image memory, 29 Near address generation circuit. Agent Patent Attorney Tadashi Sugiura Tomochi Figure 1 Constituent text 1st food Mt or WE 5 Figure 4 Rebellion

Claims (1)

[Claims] Image information to be displayed is divided into (N×M) mosaics for each block B (m, n), and an In an image information reproducing apparatus that forms a Y series consisting of the continuous mosaic, and reproduces a recording medium in which the X series and the Y series are separately recorded in a reproducible manner, (J×K) pieces (however, Displaying a display area consisting of the mosaic of (1<J<N) (1<K<M), accessing one or both of the X series and the Y series from the recording medium to obtain supplementary data, An image information reproducing device characterized by performing a scrolling operation.