JP3598515B2 - DISK PLAYER AND OSD IMAGE GENERATION METHOD - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for generating an OSD (On Screen Display) image to be superimposed on a certain image.
[0002]
[Prior art]
2. Description of the Related Art A disk reproducing apparatus for reproducing an image recorded on a disk which is a disk-shaped recording medium such as a DVD (Digital Video Disc) has a function of superimposing an OSD image on an image reproduced from the disk. Conventionally, in the OSD image, pattern data indicating whether each dot of the OSD image is a character portion or a background portion, and coloring data for designating the colors of the character portion and the background portion of the OSD image are stored in a ROM ( Read only memory, and an OSD image is generated by a CPU (Central Processing Unit) developing one dot at a time in a display memory based on the pattern data and the coloring data stored in the ROM. Was.
[0003]
To expand the image in the memory means to recognize whether the dot of interest is a character portion or a background portion based on the pattern data and the coloring data of the image, and specify the dot as the character portion and the background portion, respectively. Recognize the color of the character, 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 area corresponding to the dot of interest. Each means to store.
[0004]
[Problems to be solved by the invention]
As described above, conventionally, since the OSD image is generated by developing one dot at a time in the memory based on the pattern data and the coloring data, the time required until the OSD image is generated is long. As a result, operability has been hindered. Further, the microcomputer that generates the OSD image is not usually used only for generating the OSD image, and performs other processing. Since the CPU is occupied, other processes cannot be performed efficiently.
[0005]
If the background part of the OSD image to be developed this time and the background part of the OSD image developed immediately before have the same color, the background part of the OSD image is not simply developed, and Although the time required for generation can be shortened, the character of the OSD image that has been developed immediately before and the character of the OSD image that has been developed this time are overlapped images.
[0006]
Further, the technology disclosed in Japanese Patent Application Laid-Open No. 9-90923 aims to arbitrarily increase the number of transparent colors and priority colors in superimposing a plurality of screens, and to speed up the rewriting of transparent colors and priority colors. However, this does not solve the above problem.
[0007]
The technique disclosed in Japanese Patent Application Laid-Open No. 2000-98993 reduces power consumption of a display controller and reduces competition between frame buffer access from a higher order and frame buffer access in the display controller. It does not solve the above problems.
[0008]
Therefore, an object of the present invention is to provide an OSD image generation method that reduces the time required until an OSD image is generated and enables other processes to be performed efficiently.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, data of each color that can be taken by a background portion of an OSD image is stored as a background portion of a requested OSD image from a first memory in which one line of the OSD image is stored in advance. One line of data of the designated color is DMA-transferred to a second memory having a capacity capable of storing color data of one line of the OSD image. And recognizes the color designated as the character part of the OSD image and the character part of the OSD image, and stores the character of the OSD image in the area on the second memory corresponding to the character part of the OSD image on the line of interest. The data of the color specified as the portion is stored, and then the data stored in the second memory is replaced with the color data for all the dots of the OSD image. A series of operations of DMA transfer to a region corresponding to the line of interest on the third memory, which is a display memory having a capacity capable of storing the OSD image, is performed by sequentially focusing on each line. An OSD image is generated by repeating the process for a number of times.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a disk reproducing apparatus to which the present invention is applied. An output of the pickup 3 for detecting information from the disk 1 rotated and driven by the disk motor 2 is guided to a signal processing circuit 5 and a servo processing circuit 6 via an RF amplifier 4, and the output of the servo processing circuit 6 is , A digital signal processor (hereinafter, “DSP”) 5.
[0011]
In the DSP 5, a track buffer RAM (Random Access Memory) for temporarily storing data amplified by the RF amplifier 4 and decoded in accordance with the DVD standard (here, compressed by MPEG (Motion Picture Expert Group)). 7) is connected. The RF amplifier 4, DSP 5, and servo processing circuit 6 are controlled by a microcomputer 8. As described above, the microcomputer 8 controls the operation of reproducing information from the disk 1, and is hereinafter referred to as a "front-end microcomputer".
[0012]
The servo processing circuit 6 performs servo control of focusing servo and tracking servo 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 moves the entire pickup 3 in the radial direction of the disk 1. The control of the sled motor 9 for moving and the control of the tray motor 10 for driving the tray (not shown) for loading the disk 1 are performed.
[0013]
When the disc 1 loaded on the tray is a DVD, a reproduction signal is input to the DSP 5 via the RF amplifier 4, while the disc 1 loaded on the tray is loaded on a CD-ROM (Compact Disc-Read Only). The playback signal in the case of “Memory” is input from the RF amplifier 4 to the DSP 5 via the servo processing circuit 6. The DSP 5 also performs a decoding process of the DVD data and a decoding process of the CD-ROM data.
[0014]
The DSP 5 is connected to an A / V (Audio / Video) decoder 11, and the output of the A / V decoder 11 is connected to a video encoder 13 and a D / A converter 14. The A / V decoder 11 decompresses the MPEG-compressed data read from the track buffer RAM 7. Further, the A / V decoder 11 is connected to an A / V decode RAM 15 for storing expanded digital data for several screens.
[0015]
The A / V decoder 11 is connected to a microcomputer 16, and a work RAM 17 is connected to the microcomputer 16. Note that the microcomputer 16 controls the operation of outputting information reproduced from the disk 1, and is hereinafter referred to as a "back-end microcomputer". Further, the operation of the entire disc reproducing apparatus is controlled by cooperation between the front-end microcomputer 8 and the back-end microcomputer 16.
[0016]
The back-end microcomputer 16 is connected to a front panel controller 19 for controlling display of a front panel 20 composed of an LCD or the like. The output of the key input unit 21 is guided to the front panel controller 19. Further, the front panel controller 19 is provided with a receiving unit (not shown) for receiving a transmission signal from the remote controller 22.
[0017]
Here, the operation at the time of reproduction in the disk reproducing apparatus having the above configuration will be briefly described. The data recorded on the disk 1 is detected by the pickup 3, subjected to waveform shaping and amplification by the RF amplifier 4, and then decoded by the DSP 5 in accordance with 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 back-end microcomputer 16.
[0018]
The data stored in the track buffer RAM 7 is sequentially read out in accordance with a read request from the back-end microcomputer 16 and transferred to the A / V decoder 11, where the compressed data is decompressed by MPEG and the video data is decompressed. Is decoded. The decoded video data is temporarily stored in the A / V decoding RAM 15, then read out again and sequentially transferred to the video encoder 13, where it is converted into an analog video signal and output from the video output terminals 13a and 13b. Is done.
[0019]
On the other hand, audio data compressed by MPEG is sequentially stored in the track buffer RAM 7 like video data, sequentially read out according to a read request from the back-end microcomputer 16, and transferred to the A / V decoder 11, Here, the compressed data is expanded by MPEG and decoded into audio data. The decoded audio data is temporarily stored in an A / V decode RAM 15, then read out again and sequentially transferred to a D / A converter 14, where it is converted into an analog audio signal and output from an audio output terminal 14a. Is done.
[0020]
In such a reproducing operation, when the data stored in the track buffer RAM 7 is sequentially read in accordance with a read request from the back-end microcomputer 16, the data is sequentially overwritten by the next data, and by repeating this, the image data is sequentially stored in the subsequent data. Output to the signal reproduction system.
[0021]
The same applies to the A / V decode RAM 15. When the data stored in the A / V decode RAM 15 is sequentially read in accordance with a read request from the back-end microcomputer 16, the data is read from the track buffer RAM 7 and transferred. The image data is sequentially overwritten by the next data, and by repeating this, the image data is sequentially output to the subsequent signal reproducing system.
[0022]
Here, the back-end microcomputer 16 also has a function of generating an OSD image. The OSD image generated by the back-end microcomputer 16 (image data stored in a 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 is supplied to the video encoder 13. Is superimposed on the image data reproduced from the disk 1.
[0023]
Hereinafter, an operation in which the back-end microcomputer 16 generates an OSD image will be described. As shown in FIG. 2, the back-end microcomputer 16 includes a CPU 161, a DMA (Direct Memory Access) controller (hereinafter, “DMAC”) 162, a ROM 163, a first RAM 164, a second RAM 165, and a third RAM 166. Have. These are connected by a bus 167.
[0024]
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 specifying colors of the character portion and the background portion of the OSD image. In the pattern data, for example, the dot in the character portion is “1”, and the dot in the background portion is “0”.
[0025]
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 one line of the OSD image. The second RAM 165 has a capacity capable of storing color data for one line of the OSD image.
[0026]
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 supplied to the video encoder 13 via the A / V decoder 11, and is superimposed on the image data reproduced from the disk 1. That is, the third RAM 166 is a display memory on which display is performed based on the data stored therein.
[0027]
After the system is started, the CPU 161 performs the processing shown in the flowchart of FIG. 3 so that the data of each color that can be taken by the background portion of the OSD image is stored in the first RAM 164 for each line of the OSD image in advance.
[0028]
Further, when receiving the OSD image display request, the CPU 161 performs the processing shown in the flowchart of FIG. This processing will be described. The color specified as the background part of the OSD image requested to be displayed is recognized based on the coloring data stored in the ROM 163, and the color of the color specified as the background part of the OSD image requested to be displayed is determined. The data for the line is DMA-transferred from the first RAM 164 to the second RAM 165 using the DMAC 162 (S1).
[0029]
Next, based on the pattern data and the 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, the character portion of the OSD image and the color specified as the character portion of the OSD image on the line of interest are recognized based on the pattern data and coloring data stored in the ROM 163, and the color on the line of interest is recognized. The data of the color designated as the character part of the OSD image is stored in the area on the second RAM 165 corresponding to the character part of the OSD image.
[0030]
Next, the data (color data of one line of the OSD image) stored in the second RAM 165 is DMA-transferred to the area on the third RAM 166 corresponding to the line of interest by using the DMAC 162 ( S3). After finishing S3, if not all the lines have been focused (No in S4), the focused line is updated to the next line (S5), and thereafter, the process proceeds to S1 described above.
[0031]
By the above processing, for example, as shown in FIG. 5, when an OSD image in which the character portion “F” is red and the background portion is blue is generated, the data stored in the second RAM 165 and the third RAM 166 is The transition is as follows.
[0032]
First, as shown in the image diagram of FIG. 6A, a state in which one blue line, 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. become.
[0033]
Next, since all the dots on the top line L1 of the OSD image shown in FIG. 5 are background portions, the development to the second RAM 165 is not performed, and as a result, the image is shown in the image diagram of FIG. As described above, the same line (in this case, one blue line) as the first line L1 of the OSD image shown in FIG. 5 is stored in the second RAM 165.
[0034]
Next, the data stored in the second RAM 165 is DMA-transferred to the third RAM 166, and as shown in the image diagram of FIG. Is stored in the same state as the first line L1 of the OSD image shown in FIG.
[0035]
Next, as shown in the image diagram of FIG. 7A, one blue line, which is the color of the background portion of the OSD image shown in FIG. 5, is transferred again from the first RAM 164 and stored in the second RAM 165. State.
[0036]
Next, in the OSD image shown in FIG. 5, since the dot of the character portion exists on the second line L2, only the character portion is developed in the second RAM 165, as shown in the image diagram of FIG. Then, the same state as the second line L2 of the OSD image shown in FIG. 5 is stored in the second RAM 165.
[0037]
Next, the data stored in the second RAM 165 is DMA-transferred to the third RAM 166, and the data is transferred to the second line 5-2 of the third RAM 166 as shown in the image diagram of FIG. A state where the same one as the second line L2 of the OSD image shown in FIG. 5 is stored.
[0038]
Hereinafter, similarly, the processing is sequentially performed from the third line to the last line. As a result, as shown in the image diagram of FIG. 8, each line 5-1 5-2,. In the state -n, the same lines L1, L2,..., Ln of the OSD image shown in FIG. 5 are stored.
[0039]
As described above, in the present 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 is designated as the background portion of the OSD image requested to be displayed. Since the data of one line of the present color is DMA-transferred from the first RAM 164 to the second RAM 165, the background portion of the OSD image requested to be displayed is developed at this point, and the OSD image is converted to the character. Only the part needs to be expanded in the memory. On the other hand, the number of times of data transfer between RAMs is increased as compared with the conventional case, but data is DMA-transferred between RAMs.
[0040]
As described above, the time required until the OSD image is generated (the OSD image is developed in the third RAM 166 serving as a display memory based on the pattern data and the background color data stored in the ROM 163) is reduced. You. In addition, the more the OSD image to be generated has more background portions, the shorter the time required to generate the OSD image is. As described above, since the time required until the OSD image is generated is reduced, the OSD image is displayed at a higher speed from the viewpoint of the user, and the operability is improved.
[0041]
Further, even when an OSD image is being generated, the CPU 161 can execute other processing while the DMA transfer is being executed, so that other processing can be performed efficiently.
[0042]
In the present embodiment, the destination to which one line of the same color as the background part of the OSD image is transferred from the first RAM 164 and the destination to which the OSD image is expanded only for the character part are the third display memories. Instead of using the RAM 166, the second RAM 165 which is not a display memory is used, so that each line of the OSD image is established and then transferred to the third RAM 166 which is a display memory. And flickering of the OSD image can be suppressed.
[0043]
【The invention's effect】
As described above, according to the present invention, it is only necessary to expand the pattern data in the memory for the character portion. Therefore, the number of times of data transfer between the memories increases, but the data is DMA-transferred between the memories. Thus, in total, the time required until an OSD image is generated can be reduced. As a result, the OSD image is displayed at higher speed, and the operability is improved.
[0044]
Further, since the CPU can execute other processing while data is being DMA-transferred between the memories, the CPU can execute other processing while the OSD image is being generated. Therefore, other processing can be performed efficiently. Accordingly, it is expected that the present invention is applied to a disk reproducing apparatus or the like that requires various processes in a microcomputer, and that the operation speed is increased.
[Brief description of the drawings]
FIG. 1 is a block diagram of a disk reproducing apparatus to which the present invention has been applied.
FIG. 2 is a diagram illustrating a configuration of a part related to generation of an OSD image by a back-end microcomputer in FIG. 1;
FIG. 3 is a flowchart of an operation performed by a CPU in a back-end microcomputer at the time of system startup.
FIG. 4 is a flowchart of an operation performed when a CPU in a back-end microcomputer receives an OSD image display request.
FIG. 5 is a diagram illustrating 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 back-end microcomputer when the OSD image of FIG. 5 is generated.
7 is a diagram illustrating an image of data stored in a second RAM and a third RAM in the back-end microcomputer when the OSD image of FIG. 5 is generated.
8 is a diagram showing an image of data finally stored in a third RAM in the back-end microcomputer when the OSD image of FIG. 5 is generated.
[Explanation of symbols]
1 disk 2 disk 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 (back-end microcomputer)
17 Work RAM
19 Front Panel Controller 20 Front Panel 21 Key Input Unit 22 Remote Controller 161 CPU
162 DMAC (DMA controller)
163 ROM
164 First RAM
165 Second RAM
166 Third RAM (Memory for Display)
167 bus

Claims (2)

A disc reproducing apparatus for reproducing an image recorded on a disc which is a disc-shaped recording medium, the disc reproducing apparatus having an OSD image generating means for generating an OSD image superimposed on an image reproduced from the disc. ,
The OSD image generating means includes a CPU, pattern data indicating whether each dot of the OSD image is a character portion or a background portion, and coloring data for specifying colors of the character portion and the background portion of the OSD image. , A first RAM storing data of each color that can be taken by the background portion of the OSD image for one line of the OSD image, and a capacity capable of storing color data for one line of the OSD image. A second RAM, a third RAM which is a display memory having a capacity capable of storing color data for all dots of the OSD image, and a DMA controller which DMA-transfers data between the RAMs. The DMA controller stores one line of data of a color designated as a background portion of an OSD image from the first RAM to the second RAM. DMA transfer, and then the CPU recognizes the character portion of the OSD image and the color designated as the character portion of the OSD image on the line of interest on the basis of the pattern data and the coloring data. The data of the color designated as the character part of the OSD image is stored in the area on the second RAM corresponding to the character part of the OSD image on the line of. A series of operations of DMA-transferring the data stored in the RAM to the area on the third RAM corresponding to the line of interest is repeated by the number of lines of the OSD image while sequentially focusing on each line. A disc reproducing apparatus characterized in that an OSD image is generated thereby. In a method of generating an OSD image to be superimposed on a certain image, data of each color that can be taken by the background portion of the OSD image is stored in advance in a first memory for one line of the OSD image from a first memory. Is transferred by DMA to a second memory having a capacity capable of storing color data for one line of the OSD image, and then the CPU focuses on the line of interest. Recognize the color specified as the character part of the OSD image and the character part of the OSD image above, and store the OSD image in the area on the second memory corresponding to the character part of the OSD image on the line of interest. The data of the color designated as the character portion is stored, and the data stored in the second memory is replaced with the data of all the dots of the OSD image. A series of operations of DMA transfer to a region corresponding to a line of interest on a third memory, which is a display memory having a capacity capable of storing grayscale data, is sequentially focused on each line. A method for generating an OSD image, wherein an OSD image is generated by repeatedly performing the number of lines of the OSD image.

Images