JP2003174627A - Disk reproducing device and method for generating osd image - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an OSD image generating method for reducing time required until an OSD (On Screen Display) image superimposed on an image is produced, and efficiently performing other processing. <P>SOLUTION: In the OSD image generating method, a series of operations are repeated by the number of lines of the OSD images while sequentially taking notice of each line, each comprising: a step S1 of transferring data by one line for a color designated as a background part of the OSD image on display request from a first memory to a second memory by means of DMA; a step S2 of extending only a characteristic part of the OSD image on a noted line to the second memory; and a step S3 of transferring data stored in the second memory to an area on a third memory corresponding to the noted line by means of DMA. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of generating an OSD (On Screen Display) image superimposed on a certain image.

[0002]

2. Description of the Related Art A disc reproducing apparatus for reproducing an image recorded on a disc which is a disc-shaped recording medium such as a DVD (Digital Video Disc) has a function of superimposing an OSD image on the image reproduced from the disc. I have it. Conventionally, this OSD image has ROM (pattern data indicating whether each dot of the OSD image is a character portion or a background portion) and coloring data for designating colors of the character portion and the background portion of the OSD image. Read Only Memor
y) and store it in the CPU (Central Processing Uni
The OSD image is generated by developing t) into the display memory one dot at a time based on the pattern data and the coloring data stored in the ROM.

The development of an image in a memory means that the dot under attention is recognized as a character portion or a background portion on the basis of the image pattern data and coloring data, and the character portion and the background portion are respectively recognized. Recognize the specified color, and for the character part, the data of the color specified as the character part, and for the background part, the data of the color specified as the background part are stored in the memory corresponding to the dot under consideration. It means to store in each area.

[0004]

As described above, the prior art is as follows.
Since the OSD image is generated by developing each dot in the memory based on the pattern data and the coloring data, it takes a long time to generate the OSD image. As a result, the operability was hindered. Further, the microcomputer for generating the OSD image is not usually used only for generating the OSD image, but is adapted to perform other processing. Since the CPU is occupied, other processing cannot be efficiently performed.

If the background portion of the OSD image developed this time and the background portion of the OSD image developed immediately before have the same color, simply omitting the background portion of the OSD image by The time required to generate an OSD image can be shortened, but the OSD developed immediately before
The image character and the OSD image character developed this time will overlap.

Further, the technique disclosed in Japanese Patent Application Laid-Open No. 9-90923 discloses that a transparent color and a priority color can be arbitrarily set in superimposing a plurality of screens, and the speed of rewriting a transparent color or a priority color designation can be increased. The above problem is not solved.

The technique disclosed in Japanese Patent Application Laid-Open No. 2000-98993 reduces the power consumption of the display controller and reduces the contention between the frame buffer access from the host and the frame buffer access in the display controller. However, it does not solve the above problems.

Therefore, an object of the present invention is to provide an OSD image generation method which shortens the time required until an OSD image is generated and enables other processing to be performed efficiently.

[0009]

In order to achieve the above object, according to the present invention, data of each color that a background portion of an OSD image can take is stored in advance from a first memory in which one line of the OSD image is stored in advance. The data for one line of the color specified as the background portion of the requested OSD image is converted to the OSD
DMA transfer is performed to a second memory having a capacity capable of storing color data for one line of the image, and then the CPU specifies the character portion of the OSD image and the character portion of the OSD image on the line of interest. The recognized color, and the OS is displayed in the area on the second memory corresponding to the character portion of the OSD image on the line of interest.
The data of the color designated as the character portion of the D image is stored, and then the data stored in the second memory has a capacity capable of storing the color data of all dots of the OSD image. A series of operations of DMA transfer to the area corresponding to the line of interest on the third memory, which is the display memory,
An OSD image is generated by repeating the process for the number of lines of the image.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a disc reproducing apparatus to which the present invention is applied. The output of the pickup 3 that detects information from the disk 1 that is rotationally driven by the disk motor 2 is guided to the signal processing circuit 5 and the servo processing circuit 6 via the RF amplifier 4, and the output of the servo processing circuit 6 is , Digital signal processor (hereinafter,
"DSP") 5.

Further, in the DSP 5, data amplified by the RF amplifier 4 and decoded according to the DVD standard (here, MPEG (Motion Picture Expert) is used.
A track buffer RAM (Random Access Memory) 7 for temporarily storing (compressed by Group) is connected. The RF amplifier 4, DSP 5, and servo processing circuit 6 are controlled by the microcomputer 8. As described above, the microcomputer 8 controls the operation of reproducing information from the disc 1, and is hereinafter referred to as a "front end microcomputer".

The servo processing circuit 6 performs focusing servo control and tracking servo servo control for the pickup 3 in accordance with commands and control data transmitted and received from the front end microcomputer 8 via the DSP 5, and at the same time, the entire pickup 3 is stored in the disk 1. The sled motor 9 for moving in the radial direction and the tray motor 10 for driving a tray (not shown) for loading the disk 1 are controlled.

The disc 1 loaded on the tray is DV
When the reproduction signal is D, the reproduction signal is transmitted via the RF amplifier 4 to D
On the other hand, the disc 1 loaded in the SP5 and loaded in the tray is a CD-ROM (Compact Disc-Read Only Memor).
The reproduced signal in the case of y) is input from the RF amplifier 4 to the DSP 5 via the servo processing circuit 6. DSP5
Decodes these DVD data and CD-ROM
It also performs data decoding processing and the like.

Further, the DSP 5 is an A / V (Audio / Vide)
o) A / V decoder 1 connected to the decoder 11
The output of 1 is connected to the video encoder 13 and the D / A converter 14. The A / V decoder 11 expands the data read from the track buffer RAM 7 and compressed by MPEG. The A / V decoder 11 is also connected to an A / V decode RAM 15 for storing expanded digital data for several screens.

The A / V decoder 11 is connected to the microcomputer 16, and the work RAM 17 is connected to the microcomputer 16. still,
The microcomputer 16 controls the operation of outputting the information reproduced from the disc 1.
It is referred to as a "back-end microcomputer". Also,
Front-end microcomputer 8 and back-end microcomputer 16
The operation of the entire disc reproducing apparatus is controlled in cooperation with.

Further, the back-end microcomputer 16 has an L
A front panel controller 19 for controlling display of a front panel 20 such as a CD is connected, and the output of the key input unit 21 is guided to the front panel controller 19. Further, the front panel controller 19 has A receiver (not shown) that receives a transmission signal from the remote controller 22 is provided.

Here, the operation at the time of reproduction in the disc reproducing apparatus having the above-mentioned structure will be briefly described. Disk 1
The data recorded in R is detected by the pickup 3 and R
After waveform shaping and amplification are performed by the F amplifier 4, the DSP 5
Is decoded according to the DVD standard. The decoded data is sequentially stored in the track buffer RAM 7 while being compressed by MPEG, and waits for a read request from the backend microcomputer 16.

The data stored in the track buffer RAM 7 are sequentially read according to the read request from the back-end microcomputer 16, and the A / V decoder 11
The compressed data is expanded by MPEG and decoded into video data. The decoded video data is once stored in the A / V decoding RAM 15 and then read again to be read by the video encoder 13
To the video output terminals 13a and 13b.

On the other hand, audio data compressed by MPEG is sequentially stored in the track buffer RAM 7 similarly to video data, and is sequentially read according to a read request from the backend microcomputer 16.
The data is transferred to the A / V decoder 11, where the compressed data is expanded by MPEG and decoded into audio data. The decoded audio data is A /
After being temporarily stored in the V decode RAM 15, it is read again and sequentially transferred to the D / A converter 14, where it is converted into an analog audio signal and output from the audio output terminal 14a.

In such a reproducing operation process, when the data stored in the track buffer RAM 7 is sequentially read according to the read request from the back-end microcomputer 16, it is sequentially overwritten by the next data, and by repeating this, the image data is reproduced. Are sequentially output to the subsequent signal reproduction system.

The same applies to the A / V decode RAM 15, and when the data stored in the A / V decode RAM 15 are sequentially read according to the read request from the back-end microcomputer 16, the track buffer RA
The next data read from M7 and transferred is sequentially overwritten, and by repeating this, the image data is sequentially output to the subsequent signal reproduction system.

Here, the back-end microcomputer 16 is the OS
It also has a function of generating a D image. The OSD image generated by the back-end microcomputer 16 (image data stored in the third RAM 166 in the back-end microcomputer 16 described later) is supplied to the video encoder 13 via the A / V decoder 11, and the video encoder 13 At the same time, it is superimposed on the image data reproduced from the disc 1.

Hereinafter, the back-end microcomputer 16 is the OSD.
The operation of generating an image will be described. As shown in FIG. 2, the back-end microcomputer 16 includes a CPU 161 and a DM.
A (Direct Memory Access) controller (hereinafter "D
MAC ") 162, ROM 163, first RAM 16
4, a second RAM 165, and a third RAM 166. These are connected by a bus 167.

The ROM 163 stores pattern data indicating whether each dot of the OSD image is a character portion or a background portion, and coloring data for designating colors of the character portion and the background portion of the OSD image. ing.
In the pattern data, for example, the dot in the character portion is "1" and the dot in the background portion is "0".

The first RAM 164 has a capacity capable of storing data of each color that can be taken by the background portion of the OSD image for each line of the OSD image. Second RAM 165
Has a capacity capable of storing color data for one line of the OSD image.

The third RAM 166 has a capacity capable of storing color data for all the dots of the OSD image.
The data stored in the third RAM 166 is
It is supplied to the video encoder 13 via the A / V decoder 11 and is superimposed on the image data reproduced from the disc 1. That is, the third RAM 166 serves as a display memory in which display is performed based on the data stored therein.

After the system is activated, the CPU 161 executes the process shown in FIG.
By performing the processing shown in the flowchart of FIG.
Data of each color that can be taken by the background portion of the D image is stored in advance in the first RAM 164 for each line of the OSD image.

When the CPU 161 receives the OSD image display request, it executes the processing shown in the flowchart of FIG. This processing will be described. OS requested to be displayed
The color specified as the background portion of the D image is stored in the ROM 16
The data for one line of the color designated as the background portion of the OSD image which is requested to be displayed is recognized by the DMAC 162 from the first RAM 164 to the second RAM 165. DMA transfer is performed by using (S1).

Next, based on the pattern data and coloring data stored in the ROM 163, only the character portion of the OSD image on the line of interest is developed in the second RAM 165 (S2). That is, RO
The character portion of the OSD image on the line of interest and the color designated as the character portion of the OSD image are recognized based on the pattern data and the coloring data stored in M163, and the OSD image on the line of interest is recognized. RAM corresponding to the character part of
Data of the color designated as the character portion of the OSD image is stored in the area 165.

Next, the data stored in the second RAM 165 (color data for one line of the OSD image) is DMA-registered in the area on the third RAM 166 corresponding to the line of interest by using the DMAC 162. Transfer (S3). S
When 3 is finished, if the attention has not been paid to all the lines (No in S4), the noticed line is updated to the next line (S5), and then the process proceeds to S1 described above.

As a result of the above processing, for example, as shown in FIG. 5, the character portion "F" is in red and the background portion is in blue.
When generating an SD image, the second RAM 165
And the data stored in the third RAM 166 changes as follows.

First, as shown in the image diagram of FIG. 6A, one line of blue, which is the color of the background portion of the OSD image shown in FIG. 5, is transferred from the first RAM 164 and stored in the second RAM 165. It will be in the state of being.

Next, since all the dots on the head line L1 of the OSD image shown in FIG. 5 are the background portion, the expansion to the second RAM 165 is not performed, and as a result, the result shown in FIG. As shown in the image diagram, the same line as the first line L1 of the OSD image shown in FIG. 5 (in this case, one blue line) is stored in the second RAM 165.

Next, the data stored in the second RAM 165 is DMA-transferred to the third RAM 166, and the data shown in FIG.
As shown in the image diagram of (c) of FIG.
In the head line 5-1 of FIG. 6, the same line as the head line L1 of the OSD image shown in FIG. 5 is stored.

Next, as shown in the image diagram of FIG. 7A, one line of blue, which is the color of the background portion of the OSD image shown in FIG. 5, is transferred again from the first RAM 164 to the second RAM 165. It will be in the state stored in.

Next, in the OSD image shown in FIG. 5, since the dot of the character portion exists on the second line L2, the second RAM 16 only for this character portion.
5, the same line as the second line L2 of the OSD image shown in FIG. 5 is stored in the second RAM 165, as shown in the image diagram of FIG. 7B.

Next, the data stored in the second RAM 165 is DMA-transferred to the third RAM 166, and the data shown in FIG.
As shown in the image diagram of (c) of FIG.
In the second line 5-2 of No. 6, 2 of the OSD image shown in FIG.
The same thing as the second line L2 is stored.

In the same manner, the third line to the last line are sequentially processed in the same manner, and as a result, as shown in the image diagram of FIG. 8, each line 5 of the third RAM 166 is processed.
, 5-2, ..., 5-n are respectively O shown in FIG.
The same lines as the corresponding lines L1, L2, ..., Ln of the SD image are stored.

As described above, in this embodiment, the data of each color that can be taken by the background portion of the OSD image is stored in advance in the first RAM 164 one line at a time and used as the background portion of the OSD image requested to be displayed. Data for one line of the designated color is transferred from the first RAM 164 to the second RAM
Since it is DMA-transferred to 165, the OSD that has made a display request
The background portion of the image has been developed at this point, and it suffices to develop the OSD image in the memory only for the character portion. On the other hand, although the number of times data is transferred between RAMs is increased compared to the conventional case, data is DMA-transferred between RAMs.

From the above, the OSD image is generated (RO
The third OSD image is a display memory based on the pattern data and the background color data stored in M163.
(Expanded in the RAM 166 of) is shortened. In addition, the more the background portion of the generated OSD image, the shorter the time required to generate the OSD image. In this way, the time required to generate the OSD image is shortened, so that the OSD image is displayed at a higher speed from the viewpoint of the user, and the operability is improved.

Even when the OSD image is being generated, the CPU 161 is in operation while the DMA transfer is being executed.
Since the other processing can be executed, the other processing can be efficiently performed.

Further, in the present embodiment, the first RAM 16
The third RAM 1 which is a memory for displaying the destination of transferring one line of the same color as the background portion of the OSD image from 4 and the destination of expanding the OSD image only for the character portion.
Since the second RAM 165, which is not a display memory, is used instead of 66, the third RAM 16 which is a display memory after each line of the OSD image is established.
6 will be transferred to the No. 6 and the flicker of the OSD image can be suppressed.

[0043]

As described above, according to the present invention,
Since it is only necessary to expand the pattern data in the memory only for the character portion, the number of times of data transfer between the memories increases, but since the data is DMA transferred between the memories, an OSD image is generated in total view. It is possible to shorten the time required to be performed. As a result, the OSD image will be displayed faster,
Operability is improved.

Further, since the CPU can execute other processing while the data is DMA-transferred between the memories, the CPU can execute other processing while the OSD image is being generated. As a result, other processing can be efficiently performed. Therefore, by applying the present invention to a disc reproducing apparatus or the like which requires various processing for a microcomputer, it is expected that the operation speed is increased.

[Brief description of drawings]

FIG. 1 is a block diagram of a disc reproducing apparatus to which the present invention is applied.

FIG. 2 is a diagram showing a configuration of a part related to generation of an OSD image of the back-end microcomputer in FIG.

FIG. 3 is a flowchart of an operation performed by a CPU in the back-end microcomputer at system startup.

FIG. 4 is a flowchart of an operation performed when the CPU in the back-end microcomputer receives an OSD image display request.

FIG. 5 is a diagram showing an example of an OSD image.

6 is a diagram showing an image of data stored in a second RAM and a third RAM in the backend microcomputer when the OSD image of FIG. 5 is generated.

7 is a diagram showing an image of data stored in a second RAM and a third RAM in the backend microcomputer when the OSD image of FIG. 5 is generated.

FIG. 8 is a diagram showing an image of data finally stored in a third RAM in the backend microcomputer when the OSD image of FIG. 5 is generated.

[Explanation of symbols]

1 Disc 2 Disc Motor 3 Pickup 4 RF Amplifier 5 DSP (Digital Signal Processor) 6 Servo Processing Circuit 7 Track Buffer RAM 8 Microcomputer (Front End Microcomputer) 11 A / V Decoder 13 Video Encoder 14 D / A Converter 15 A / V Decode RAM 16 Microcomputer (backend microcomputer) 17 Work RAM 19 Front panel controller 20 Front panel 21 Key input section 22 Remote controller 161 CPU 162 DMAC (DMA controller) 163 ROM 164 First RAM 165 Second RAM 166 Third RAM (display memory) 167 bus

Claims (2)

[Claims] 1. A disc reproducing apparatus for reproducing an image recorded on a disc, which is a disc-shaped recording medium,
In a disc reproducing apparatus having an OSD image generating means for generating an OSD image superimposed on an image reproduced from a disc, the OSD image generating means comprises a CPU and each dot of the OSD image is a character portion or a background portion. R that stores pattern data indicating whether there is any color data and coloring data that specifies the colors of the character portion and the background portion of the OSD image
A first RAM that stores data for each color of the OM and the background portion of the OSD image for each line of the OSD image
A second RAM having a capacity capable of storing color data for one line of the OSD image, and a display memory having a capacity capable of storing color data for all dots of the OSD image. DMA data between the third RAM and RAM
And a DMA controller for transferring the data.
The MA controller DMA-transfers data for one line of the color designated as the background portion of the OSD image from the first RAM to the second RAM, and then the CPU
Recognizes the character portion of the OSD image on the line of interest and the color designated as the character portion of the OSD image based on the pattern data and the coloring data, and the character portion of the OSD image on the line of interest The data of the color designated as the character portion of the OSD image is stored in the area on the second RAM corresponding to, and then the DMA controller focuses on the data stored in the second RAM. A series of operations of performing a DMA transfer to the area on the third RAM corresponding to the line in
By repeating for the number of lines of the image, O
A disc reproducing apparatus characterized in that an SD image is generated. 2. In a method of generating an OSD image to be superimposed on an image, data of each color that the background portion of the OSD image can take is requested from a first memory in which one line of the OSD image is stored in advance. Data for one line of the color designated as the background portion of the OSD image is DMA-transferred to the second memory having a capacity capable of storing the color data for one line of the OSD image, and then the CPU The character portion of the OSD image and O on the line of interest
The color designated as the character portion of the SD image is recognized, and the OSD is stored in the area on the second memory corresponding to the character portion of the OSD image on the line of interest.
The color data designated as the character portion of the image is stored, and then the data stored in the second memory has a capacity capable of storing the color data for all dots of the OSD image. An OSD image is obtained by sequentially paying attention to each line and repeating a series of operations of DMA transfer to a region corresponding to the line of interest on the third memory, which is a memory for display, for each line of the OSD image. A method for generating an OSD image, which comprises: