CN1239628A - Appts. and method for generating on-screen-display messages using one-bit pixels - Google Patents
Appts. and method for generating on-screen-display messages using one-bit pixels Download PDFInfo
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- CN1239628A CN1239628A CN 96180533 CN96180533A CN1239628A CN 1239628 A CN1239628 A CN 1239628A CN 96180533 CN96180533 CN 96180533 CN 96180533 A CN96180533 A CN 96180533A CN 1239628 A CN1239628 A CN 1239628A
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Abstract
An apparatus and concomitant method for generating an OSD message by constructing an OSD bitstream having a plurality of "one-bit" pixels. The OSD bitstream contains an OSD header and OSD data. An OSD unit retrieves pixel control information from the OSD header which is programmed by a processor of a decoding/displaying system. The OSDheader contains information that is used to program a color palette of the OSD unit and to provide instructions as to the treatment of the OSD data. If the "Compressed Pixel Mode" is enabled in the OSD header, then the OSD unit will treat each bit of the OSD data as a "one-bit" pixel.
Description
The present invention relates to be used to produce the method and apparatus of screen display (OSD) message.More particularly, the present invention relates to by using a pixel to reduce the memory bandwidth requirement of decoding/display system, is a predefined palette in OSD district with visit.
On-screen-display messages plays an important role in consumer electronic products, the user is provided the structure of the finger menus that they all use and this product.The ability that provides closed-caption (Closed Captioning) and channel logo (logos) to show is provided other key character of OSD.
Yet the raising of digital video technology standard has caused the problem that produces and show the increase of OSD message total amount.For example, special high definition TV (HDTV) specification is compared with the present National Television Systems Committee specification of maximum 128 characters in a window, and HDTV must show up to 216 characters in four windows.These new specifications have increased great burden to the decoding/display system of TV signal, and they must be deciphered the encoded data stream of input, and the data that will decipher with the delay of minimum offer display system.Because OSD message must show (overlapping) with video data, the microprocessor of this decoding/display system must be specified the portions of bandwidth of a memory, with the execution osd function, thereby the memory bandwidth that has increased decoding/display system needs and total computing cost.
Therefore, need a kind of method and apparatus, be used to produce screen display (OSD) message, and do not increase the hardware needs of decoding/display system, such as the memory bandwidth.
The present invention relates to, have effective osd bitstream of one group of " one " pixel, produce the equipment of OSD message and the method for following thereof by formation.
More particularly, according to the present invention, an OSD unit recovers osd bitstream from storage device.This osd bitstream comprises OSD head and osd data.This OSD head comprises the color palette of this OSD unit that is used to programme and the control information of the instruction of handling about osd data is provided.This control information is to be programmed by the processor of decoding/display system.If started this " compression pixel mode " in the OSD head, then this OSD unit is handled the osd data in this osd bitstream each as " 1-position " pixel.That is, two of may index are represented in each osd data position, wherein one of many possible OSD palette inlets of each index definition.For example, if having, then should only use single addressable two the possible inlets in position by " 1-position " pixel by addressable 16 the possible inlets of 4 bit address.The group of 3 osd data bytes is in succession represented the actual colourity and the intensity level of an OSD pixel.
Now these and other aspect of the present invention will be described with reference to the accompanying drawings.
In the accompanying drawings:
Fig. 1 is the block diagram of the decoding/display system that comprises the OSD unit according to an aspect of the present invention;
Fig. 2 is the block diagram that shows the structure of sampling compression pixel bit stream; With
Fig. 3 is the flow chart that expression is used to constitute the method for the effective osd bitstream with one group of 1-position pixel.
Fig. 1 represents for the decoding/display system of TV signal 100 block diagram of (being called decoding system later on).This decoding system comprises processor 130, random access memory (RAM) (RAM) 140, read-only memory (ROM) 142, OSD unit 150, video decoder 160 and blender 170.The output of blender 170 180 is coupled to display unit 190 through the path.
According to mpeg standard, ISO/IEC international standard 11172 (1991) (being commonly referred to as the MPEG-1 form) and 13818 (1995) (being commonly referred to as the MPEG-2 form) are described the present invention below.Yet, person of skill in the art will appreciate that, the present invention can be applied to or be used to realize other decoding system of other coding/decoding form.
In this most preferred embodiment, 100 pairs of various data flow of decoding system (bit stream) 120 carry out real-time audio frequency and video goes compression.This bit stream 120 can comprise audio frequency and the video-frequency basic flow according to MPEG-1 and Moving Picture Experts Group-2 coding.Produce this coding stream 120 by the encoder (not shown), and send to this decoding system by communication channel.This coding stream comprises the coded representation of one group of image, and can comprise the audio-frequency information relevant with these images, such as, multimedia data stream.This multimedia sources can be the HDTV platform, optic disk, cable TV station etc.Successively, the decoding of 100 pairs of these coding streams of decoding system is producing one group of decoding image, so that synchronously show with relevant audio-frequency information on display 190.Yet for purpose of the present invention, the audio frequency decoding function of decoding system 100 is not discussed.
More particularly, processor 130 receives bit stream 120 and bit stream 110 conduct inputs.Bit stream 110 can comprise various control signals and not be included in other data bit stream in the bit stream 120.For example, channel decoder or transmission unit (not shown) can be configured between transmission channel and the decoding system 100, with the syntactic analysis that realizes packet with to the transmission of data flow or control flows.
In this most preferred embodiment, processor 130 is carried out various controlled function, comprises but is not limited to, and provides control data to video decoder 160 and OSD unit 150, and management is to the visit of memory and control the demonstration of this decoding image.Although the invention describes single processor, those skilled in the art can know that this processor 130 can comprise the device of various special uses to manage specific function, for example, and memory controller, Microprocessor Interface unit etc.
According to mpeg standard, video decoder 160 decodings this packed data in memory 140 is so that rebuild this coded image in this memory.In certain situation, this decoding image is a difference signal, and it is added to the standard picture of storage, so that for example produce actual image, is convenient to decipher motion compensated image.In case rebuild image, before demonstration, be stored in the Display Register through blender 170.
Equally, OSD unit 150 uses memory 140 so that store this OSD bit table or OSD standard.This OSD unit makes user (producer) for overlapping onto each the definition bit table on this decoding image.This OSD bit table can comprise about the structure of specific user's electronic product and the information of selection.On the other hand, this OSD bit table can comprise relevant to cable TV, the closed-caption that optic disk etc. send and the information of channel information element.The OSD bit table is defined as position able to programme and big or small one group of district (being generally rectangle), and wherein each has the palette of a unique available colour.
This OSD bit table is write the OSD buffer of memory 140 for the purpose of user's appointment.Yet, person of skill in the art will appreciate that ROM142 or other equivalent storage device also can be used for this function.
When the specific image that is a frame started this osd function, processor 130 operated in the data in the memory 140, to produce osd bitstream.This osd bitstream comprises OSD head and osd data (pixel data).
More particularly, the OSD head of processor 130 programmings (format and storage) in memory 140.This OSD head comprises the position of relevant top and bottom OSD field bit table, palette data, and to the pointer of next header block with comprise OSD resolution, the information of the various display modes of colored and compression.This OSD head in case programmed, this processor 130 can operate in the osd data in the memory 140 according to specific embodiment.For example, format this osd data according to the pattern of selecting, such as the compression pixel mode of discussing below.In addition, this processor can be used simply to the pointer of the osd data in this memory this OSD head of programming, and has the ground of modification here and has not recovered the osd data of this storage to form this osd bitstream.
Then, processor 130 report starting states, for example, OSD unit 150 is given in the OSD starting, and it responds at the osd bitstream of 140 li storages of memory by request processor 130 visits.When this OSD head is read in this OSD unit, when each follows their relevant osd datas, just form and recovered this osd bitstream.After receiving this osd bitstream, this OSD pixel data is handled according to instruction or the preference pattern in this OSD head in this OSD unit.A pair of display counter (not shown) is waited in this OSD unit then, to obtain to be identified at the tram that is used to insert this osd information on the display.On this position, blender 170 is delivered to its output in this OSD unit.The output of this OSD unit 150 is to represent the stream of the numeric word of brightness separately and colourity or sequence.The memory access that can look for novelty when needs keep flowing through the necessary data (osd bitstream) of this OSD unit shows to generate comprehensive OSD.When last byte of the OSD pixel data of from this memory, reading present OSD zone, read next OSD head, repeat this processing up to last the OSD district that comprises this frame.
Those skilled in the art will appreciate that the order of above-mentioned formation and recovery osd bitstream is changeable.For example, when processor is just formaing this osd data, can from memory, read this OSD head, perhaps not recover under the situation of whole osd bitstream, or OSD message be handled and be shown as in this OSD unit can with this osd data.
Because the OSD pixel data is overlapped onto on this decoding image, this blender 170 will be deciphered selectively that image mixes with this OSD pixel data or be multiplexed.That is, this blender has at each pixel location demonstration OSD pixel, the pixel of this decoding image, or the ability of the combination of two kinds of pixels (mixing).This ability makes the channel logotype can show closed-caption (having only the OSD pixel data) or to show transparency (OSD pixel and decoding image pixel the two combination) on the decoding image.
The stream or the sequence of the numeric word of brightness and chromatic component respectively organized in video decoder 160 and 150 the two the formation representative of OSD system.The sequence of these video components being represented numeric word is coupled to D-A converter (DAC) 185 through blender 170.DAC by separately partly is converted to analoging brightness and carrier chrominance signal with this brightness and chrominance representation numeric word.
The bit table that this OSD unit 150 can be used for the definition of on any part of displayable screen explicit user, and with the size and the location independent of the video area of starting.Can define this bit table independently for each, be defined as the set in an OSD zone.The rectangle region that the zone is normally stipulated by its border is by its content of bit table definition.There is an associated palette in each zone, has defined one group of colour that can use in this district (such as 4 or 16 colours).If desired, one of these colours can be transparent, makes to show the background that it is whole as mentioned above.
Yet, processing has increased the computing cost of processor 130 for this osd function of a frame, the more important thing is that the memory bandwidth to this processor has applied serious burden, because this processor 130 must be served from the two memory request of video decoder 160 and OSD unit 150.Therefore, the present invention is by implementing the size that this compression pixel mode has reduced this osd bitstream.
The structure of the sampling that Fig. 2 represents " compression pixel " osd bitstream 200.This osd bitstream comprises one group of OSD head 210, and each has followed osd data 220.In one embodiment, this head is to be made of 5 64 words, is following any amount of 64 osd datas (bit table) word.This OSD head 210 comprises the information that interrelates with this OSD district coordinate 214, for the various inlets 216 and the various function code (position) 212 of the palette in specific OSD district.Those skilled in the art will appreciate that this OSD head is any length.Long head can provide more information and selection, for example, has the more palette of multiple entry, but is cost with higher computing cost,, needs the more read and write cycle that is.In fact, the content of this OSD head is the expression of specific embodiment, and is not limited to the concrete device shown in Fig. 2.
This OSD district coordinate 214 comprises the left side in OSD district and the position of right hand edge, that is, row beginning and arresting stop, the row start and stop bit is put.Show that for interlacing this district's coordinate comprises the position (pointer) of the top and bottom field pixel bit table in corresponding OSD district.At last, the pointer that comprises the next header block in the memory of this OSD district coordinate 214.
Function code (position) 212 comprises the information relevant with various patterns, includes but not limited to, shows to select and the osd bitstream selection.In this most preferred embodiment, this function digit comprises that a single position is used for expression " this compression pixel mode " and whether starts.When having started this " compression pixel mode ", then the data in this osd data comprise " 1-position " pixel of a group or a operation of following discussion.
And this compression pixel mode allows the user to stipulate the " RUN " (run) of 1-position pixel.Running length counter notifies this OSD unit in service what 1-position pixels to be arranged at each.This running length counting is write in this OSD head.
In order to illustrate, Fig. 2 shows the index byte 230 with first index, 232 and second index 234, and wherein palette inlet 5 and 12 is represented in these indexes respectively.If the Must Significant Bit (msb) of each OSD pixel byte is if corresponding to position this first pixel output when being " 1 ", send to this palette of addressing for the highest effective four 232 of the byte that then will index.If the position is " 0 ", send to this palette of addressing for minimum effective four 234 of the byte that then will index.In addition, if this compression running length counting equals 20, then and then three following data byte packet of this index byte are drawn together these 20 " 1-position " pixels.In the end of each operation, the byte of following must be next index byte, then is next operation.
This operator scheme makes processor 130 obtain 4: 1 compression ratios for the common display mode that uses four these palettes of bit addressing.Even more important for this saving of decoding system that is combined with big palette.In this compression pixel mode, for selecting two colours on the time of given operation.Yet, only adopting two colours of given character as the application of closed-caption etc., this compression pixel mode has reduced the quantity of memory operation, and does not limit the display capabilities of specific OSD scheme.In addition, this processor changes this colour index 230 simply by the end an operation, can change the selection of these two colours at an easy rate, thereby makes colored the variation.At last, although selected this compression pixel mode for OSD head 210, each multiple header block with different resolution pattern can be supported in this OSD unit.Because of this OSD unit can show dissimilar resolution or form on same video screen.
The treated device 130 of user is controlled the selection of this compression pixel mode, and this control can be used to detect by OSD unit 150 needs the software of minimizing memory access to implement.For example, this video decoder 160 can receive the coded frame of the complexity of the additional memory access of a series of needs.In order to reduce the memory access conflict between this OSD unit and this video decoder, the increase requirement that this processor can hang down this video coding that disappears by this compression pixel mode that is enabled in this osd bitstream.
Fig. 3 represents to be used to constitute the method 300 of the osd bitstream with one group of pixel.Produce this osd bitstream by processor 130, and handle by OSD unit 150.Method 300 has the OSD head of a compression pixel mode position by generation, and one group of index and data byte are and then arranged.Constitute osd bitstream.
Referring to Fig. 3, method 300 is in step 305 beginning and enter step 310, is appointed as compression pixel mode position with one in this OSD head here.If started this compression pixel mode in this OSD head, the osd data position of then following this head is a 1-position pixel.If unstart should compression pixel mode, then handle this osd data position with normal format, it may be 4 bit address (perhaps any other bit stream format, such as, mpeg standard) to palette.
In step 320, method 300 determines whether to have started this compression pixel mode.If to this inquiry is a negative answer, method 300 enters step 325, uses unpacked format to produce this osd data byte.This method 300 enters step 370 then.
If the inquiry to step 320 is an affirmative reply, method 300 enters step 330, " running length counting " is write this OSD head here.Should " operation of the 1-position pixel of running length counting representative in this osd data byte, and be used to start the running length counter.
In step 340, method 300 produces the index byte, and it has two indexes that identify two possible inlets on the palette that is arranged in this OSD head.Select this two indexes for whole service.
In step 350, method 300 produces the operation that is placed in the 1-position pixel in this osd data byte.Although each osd data byte has 8 length, can not limit this running length to any length, that is, 20 1-positions can be resembled the operation that is and be placed in three osd data bytes.
In step 360, method 300 determines whether any additional operation.If revised two operations that selecteed colour must be looked for novelty.If to this inquiry is negative answer, method 300 enters step 370.If to this inquiry is affirmative reply, method 300 enters step 330, here for each additional operation repeating step 330-350.Move these indexes that selectively are modified in this index byte for each.
In step 370, method 300 has determined whether another OSD head.If revise by the various patterns of function digit 212 representatives and the selected colour in this palette, the OSD head that must look for novelty.Equally, need a new head for each the new OSD district on the frame.If the answer is in the negative for this inquiry, method 300 enters step 380, and method 300 finishes here.If to this inquiry is affirmative reply, method 300 enters step 320, wherein for each additional OSD head repeating step 320-360.By this way, this osd bitstream can comprise compression osd data byte and non-compression osd data byte.
Like this, represented and described the new method and apparatus that constitutes osd bitstream, the improved memory bandwidth usage in decoding/display system is provided with one group of pixel.After this specification of having considered the open embodiment of the invention and accompanying drawing, be that significantly the present invention can have many variations to those skilled in the art, modification and other use and use.All these does not break away from the spirit and scope of the present invention, and scope of the present invention is only limited by this book of following claim.
Claims (14)
1. method that is used to constitute screen display (OSD) bit stream, described method comprises step:
In the OSD head, be provided with one, described position is used for expression compression pixel mode;
Produce the index byte; With
Produce one group of 1-position pixel.
2. according to the method for claim 1, also be included as the step that a described pixel is specified running length.
3. according to the process of claim 1 wherein that described index byte produces step and comprises step:
Produce first index; With
Produce second index.
4. according to the method for claim 3, wherein said first and second indexes are relevant with two palette inlets.
5. according to the method for claim 4, each of described one group of 1-position pixel and described index one is relevant.
6. according to the method for claim 1, also comprise step: produce one group of non-compression pixel.
7. an osd bitstream that stores in storage medium comprises:
Head has one and is used for expression compression pixel mode;
One group of osd data position is connected to described head, has one group of 1-position pixel.
8. according to the osd bitstream of claim 7, wherein said one group of osd data position comprises the index to palette.
9. osd bitstream according to Claim 8 wherein produces described osd bitstream according to mpeg standard.
10. according to the osd bitstream of claim 7, wherein said one group of osd data position comprises non-compression pixel.
11. an equipment that is used to produce osd bitstream comprises:
Storage medium is used to store OSD head and osd data;
Processor is coupled to described storage medium, is used for being enabled in the compression pixel mode position of described OSD head, and reads described OSD head and the described osd data with one group of 1-position pixel, to form this osd bitstream.
12. according to the equipment of claim 11, wherein said storage medium is read-only memory (ROM).
13. according to the equipment of claim 11, wherein said storage medium is random access memory (RAM) (RAM).
14. an equipment that is used to produce OSD message comprises:
Storage medium is used to store the osd bitstream with head and osd data;
Processor is coupled to described storage medium, the compression pixel mode position of the described OSD head that is used for programming, and with one group of described osd data of 1-position pixel formatization;
The OSD unit is coupled to described processor, is used to handle described osd bitstream, to form this OSD message.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96180533A CN1113528C (en) | 1996-10-16 | 1996-10-16 | Appts. and method for generating on-screen-display messages using one-bit pixels |
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| Application Number | Priority Date | Filing Date | Title |
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| CN96180533A CN1113528C (en) | 1996-10-16 | 1996-10-16 | Appts. and method for generating on-screen-display messages using one-bit pixels |
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| CN1239628A true CN1239628A (en) | 1999-12-22 |
| CN1113528C CN1113528C (en) | 2003-07-02 |
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| CN96180533A Expired - Fee Related CN1113528C (en) | 1996-10-16 | 1996-10-16 | Appts. and method for generating on-screen-display messages using one-bit pixels |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6166728A (en) * | 1992-12-02 | 2000-12-26 | Scientific-Atlanta, Inc. | Display system with programmable display parameters |
| US5614952A (en) * | 1994-10-11 | 1997-03-25 | Hitachi America, Ltd. | Digital video decoder for decoding digital high definition and/or digital standard definition television signals |
| CN1125029A (en) * | 1993-06-07 | 1996-06-19 | 亚特兰大科技公司 | Display system for a subscriber terminal |
| US5534942A (en) * | 1994-06-17 | 1996-07-09 | Thomson Consumer Electronics, Inc. | On screen display arrangement for digital video signal processing system |
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