CN1893635A - Digital video-frequency interface transmission device of set-top box and method therefor - Google Patents
Digital video-frequency interface transmission device of set-top box and method therefor Download PDFInfo
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- CN1893635A CN1893635A CNA2005100274479A CN200510027447A CN1893635A CN 1893635 A CN1893635 A CN 1893635A CN A2005100274479 A CNA2005100274479 A CN A2005100274479A CN 200510027447 A CN200510027447 A CN 200510027447A CN 1893635 A CN1893635 A CN 1893635A
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Abstract
The invention discloses DVI (digital visual interface) image transmission device and method of set-top box (STB). Being connected to STB, digital display device is in agreement to corresponding DVI image transmission mode. Gray scale process is carried out for DVI image output from video processor, and processed image is transmitted to corresponding digital display device. Thus, using different DVI image transmission modes lowers phenomenon possible to decline quality of image frame to minimum so as to retain normal playing DVI image. Therefore, based on DVI image transmission command input from external, the invention determines transmission modes of DVI image. Based on the determined transmission mode of DVI image, video processor in STB carries out process of variable gray scale for DVI image and outputs the processed result. Through DVI image output/input, STB sends the processed result to corresponding digital display device with identical mode of DVI image transmission.
Description
[technical field]
The invention relates to the SVI image transfer apparatus of set-top box and method thereof, say that in more detail be not only DTV exactly, the monitor of PC systems such as LCD or PDP is connected with set-top box, by corresponding picture also show image normally.
[background technology]
In general, the digital visual interface that uses in the PC industry (digital visual interface, hereinafter to be referred as DVI) in specification and the CE industry employed DVI specification except timing information, sharpness information, particularly also there is difference in the grey level,, in the PC industry black level (black level) is defined as 0 that is, the peak white level is defined as 255, and in the EIA861 specification in the CE industry, black level is defined as 16, and white level is 235.
Thus, according to the EIA specification, the set-top box 1 of sending ordinary image signal is same as shown in Figure 1, the DVI input of the monitor 2 by the similar PC series of DVI optical cable and LCD or PDP is connected, be connected with the DTV3 of common EC and compare, in corresponding picture, the phenomenon that contrast descends, image quality reduces and occur black can occur.
Thus, set-top box needs a kind of new DVI image transfer apparatus, even can all support the common set-top box of electric appliance component, RGB simulation, DVI output to be connected with the DVI input of the monitor of PC series such as LCD, PDP, image quality also can be guaranteed.
[summary of the invention]
The present invention researches and develops for satisfying described necessity, set-top box DVI image transfer apparatus of the present invention and goal of the invention thereof are, set-top box not only with DTV, even with the monitor of PC series such as LCD, PDP be connected, also can obtain normal image by corresponding picture.
According to this purpose, the DVI image transfer mode that the present invention will be treated to the electronic display unit that is connected with set-top box from the corresponding DVI image greyscale of video processor output is consistent, and transmits.According to the monitor characteristic, have the image quality reduction phenomenon that takes place in the electronic display unit of mutually different DVI image transfer mode and will drop to minimum, can obtain normal image by respective picture.
For this reason, the present invention transmits DVI image following steps in set-top box:
First step: certain DVI (the digital visual interface) image according to the outside input transmits order, differentiates the transfer mode of corresponding DVI image;
Second step: the DVI image transfer mode according to differentiating in the first step, carry out image processing by the video processor in the set-top box, and output, to the variable gradation conversion of corresponding DVI image;
Third step: set-top box is by certain DVI image input/output end port, and the DVI image of greyscale transformation in second step process is sent to the DVI image transfer mode corresponding digital display device identical with described DVI image transfer mode.
Set-top box DVI image transfer apparatus of the present invention comprises as lower device:
Transmit order according to certain DVI (digital visual interface) image, under the control of the microcomputer in set-top box, judge the discriminating gear of DVI image transfer mode of the transfer mode of corresponding DVI image from outside input;
DVI image transfer mode according to differentiating in DVI image transfer mode discriminating gear by the video processor in the set-top box, carries out image processing, and output, corresponding DVI image is carried out the DVI gradation of image conversion equipment of variable gradation conversion;
Under the control of microcomputer, activate the image outgoing route choice device of the outside outgoing route of the DVI image of gradation conversion in described DVI gradation of image conversion equipment selectively;
Activate selectively according to image outgoing route choice device, will be in described DVI gradation of image conversion equipment the DVI image of gradation conversion be sent to the DVI image output/input port of certain numerical display device of connection.
Identical with above detailed description, according to DVI image transmission method of the present invention, the corresponding DVI image that video display apparatus is exported carries out gray scale processing changeably, transmits, and makes it meet the DVI image transfer mode of the numerical display device that is connected with set-top box.According to the characteristic of monitor, the possibility that image quality reduction takes place in the numerical display device with mutually different DVI image transfer mode significantly reduces.
[description of drawings]
Fig. 1 is the connection status schematic diagram of common machine top box and display device;
Fig. 2 is the schematic diagram according to the DVI image transfer apparatus of set-top box of the present invention;
Fig. 3 is according to the more detailed schematic diagram of DVI gradation of image transition status of the present invention;
The DVI image delivery status that Fig. 4 A to Fig. 4 C the present invention uses is further expressed intention;
Fig. 5 is the schematic diagram according to the DVI image transmission method of set-top box of the present invention.
[embodiment]
Below with reference to accompanying drawings embodiments of the invention are elaborated.
At first, with reference to Fig. 2, the set-top box of taking DVI image transfer apparatus of the present invention to be suitable for describes as an example.
The DVI image transfer apparatus of the present invention electrical connection that communicates with ordinary video and audio signal processor among Fig. 2, its formation of described video and apparatus for processing audio comprises: the tuner 100 that receives the transfer data packets stream that sends from broadcast office; The transfer data packets stream that receives is carried out the transfer data packets stream decoder 110 of VSB/QPSK decoding in tuner 100; In transfer data packets stream decoder 110, the transfer data packets flow point of VSB/QPSK decoding is separated the transfer data packets demultiplexer 120 of audio-frequency information and video information and additional information etc.; To flow the audio-frequency information that separates the demultiplexer 120, audio decoder 130 and the Video Decoder 140 that video information is decoded respectively from transfer data packets; The video information of decoding in described Video Decoder 140 is carried out the video processor 150 of image processing; Handle user UI device 160 by certain user's order of user's keyboard operation input; The total system of set-top box and set-top box microcomputer 170 to integrally managing and control according to DVI image delivery system of the present invention.
Simultaneously, same as shown in Figure 2 with the DVI image transfer apparatus of the present invention that described video is connected with the audio-frequency information processing unit, its formation comprises as lower device: according to ordering from certain DVI image transmission of outside input by user UI device 160, under the control of the microcomputer 170 of the total system of management controller top box, differentiate the DVI image transfer mode discriminating gear 180 of corresponding DVI image transfer mode; DVI image transfer mode according to differentiating in described DVI image transfer mode discriminating gear 180 carries out image processing and output by the video processor in the set-top box, the DVI gradation of image conversion equipment 190 of the corresponding DVI image of variable gradation conversion; Under the control of described microcomputer 170, activate the image outgoing route choice device 200 of the outside outgoing route of DVI image of gradation conversion in DVI gradation of image conversion equipment 190 selectively; And will activate selectively according to image outgoing route choice device 200, the DVI image of gradation conversion is sent to certain numerical display device of connection in DVI images category degree conversion equipment 190 DVI image output/output port 210.
In the DVI image transfer apparatus of the present invention of this formation, at first DVI image transfer mode discriminating gear 180 is according to ordering from certain DVI image transmission of outside input by user UI160 device, under the control of the microcomputer 170 of the whole system of management controller top box, which kind of transfer mode the corresponding DVI image of differentiating in video processor 150 image processing and output is.
The differentiation state of described DVI image model, transmit order according to certain DVI image from the outside input, differentiate the transfer mode of corresponding DVI image, can judge selectively by user's order, in addition when DVI connects, the information that also can connect announcement by the DVI that transmits in the numeric display unit is judged the transfer mode of corresponding DVI image.
That is, described numerical display device, will connect announcement information and be stored to buffer temporarily during with situation that set-top box is connected by certain DVI image input/output end port 210 by the DVI that DVI image input/output end port 210 transmits.In this state, input transmits the words of order by certain DVI image of user UI device 160 outsides, the DVI of interim storage connects announcement information in the read buffers, extract and the differentiation corresponding information, judge whether which kind of DVI image transfer mode of the certain numerical display device be connected with DVI image input/output end port, described DVI image transfer mode can be divided into: with the LCD monitor of PC system and the DVI graphics standard pattern of EIA specification corresponding DVI image spreading pattern and VEDA DVI specification.
Then, by DVI image transfer mode discriminating gear 180, when differentiating the situation of DVI image transfer mode, DVI gradation of image conversion equipment 190 is according to the DVI image transfer mode of judging in transfer mode discriminating gear 180, carry out image processing and output, variable gradation conversion corresponding D VI image by the video processor in the set-top box 150.
That is, the gray scale of the DVI image that described DVI gradation of image conversion equipment 190 will be by video processor 150 output is kept the DVI image transfer mode of differentiating with DVI image transfer mode discriminating gear 180 and is adapted, and also can enlarge or dwindle.
Specifically, the look-up table that the gradation conversion mode that adapts with a plurality of DVI image transfer modes is set respectively, be set in described DVI gradation of image conversion equipment 190, in this state, it is under the situation of which kind of transfer mode that described DVI image transfer mode judgment means 180 is differentiated the DVI image, use the look-up table of having set the corresponding gradation conversion mode of DVI image transfer mode selectively, thus, the gradation conversion corresponding DVI image that carries out image processing, output at video processor 150 changeably.
For instance, when the DVI image transfer mode of described numerical display device is a situation with the LCD monitor of PC series and the corresponding DVI image spreading of VESA specification pattern, described DVI gradation of image conversion equipment is with the DVI image of the 16-235 gray scale look-up table by the gradation conversion mode set, and expansion being converted to the 0-235 gray scale.When being during with the corresponding DVI graphics standard of EIA DVI specification pattern, walk around the DVI image of (bypass) 16-235 gray scale, in statu quo keep existing gray scale processing rule.
At last, image outgoing route choice device 200 activates the outside outgoing route of the DVI image of gradation conversion in the DVI gradation of image conversion equipment 190 selectively under the control of microcomputer 170.DVI image input/output end port 210 activates selectively according to image outgoing route choice device 200, the DVI image of gradation conversion in the DVI gradation of image conversion equipment 190 is sent to certain numerical display device of connection.
Identical therewith, according to DVI image transfer apparatus of the present invention with the corresponding DVI image of video display apparatus output changeably gray scale be treated to the numerical display device that is connected with set-top box, and transmit, according to the characteristic of monitor, can reduce the phenomenon that image quality reduction takes place effectively in the numerical display device with mutually different DVI image transfer mode thus.
Next, with reference to Fig. 3, to being described in more detail according to DVI gradation of image transition status of the present invention.Described Fig. 3 is that the DVI image transitions with the 16-235 gray scale is the chart attirbutes of the DVI image of 0-255 gray scale, and when being DVI image spreading pattern, the DVI view data of corresponding look-up table passes on characteristic with time identical.
If(input＜16)output＝0；Else?if(16＜＝input，256)output＝(input-16)*256/220
Endif?If(output＞225)output＝255；Endif
Simultaneously, when being DVI graphics standard pattern, the DVI view data of corresponding look-up table passes on characteristic with identical down.
If(input＜16)output＝16；
Else?if(16＜＝input，256)output＝input?Endif
This gradation conversion is to use nonlinear view data to be converted to the look-up table of purpose linearly, gain (Gain) or the skew of adjusting Color Space Conversion Matrix coefficient realize, according to the DVI gradation conversion of DVI image transfer mode, more satisfactory is change of DVI level mode or the Color Space Conversion change that utilizes user's interface menu.
Next, with reference to Fig. 4 A to Fig. 4 C, DVI image delivery status is described in detail further, at first with identical shown in Fig. 4 A, import 700MV by PC with the RGB input voltage according to DVI image delivery status of the present invention, and carry out ADC and handle, be treated to the 0-255 digital numerical value.Its as a result PC be treated to the 0-255 digital numerical value with the EVSADVI level, in monitor to the no luminance differences of signals output of two input conversions.At this moment, when this monitor together is connected with the RGB analog signal with the DVI signal of the EIA specification of STB output, keep that contrast and brightness consistency are the comparison difficulties between two inputs, be that EIA DVI signal is when VESA DVI monitor is handled, the black of 16 level appears being equivalent to, identical therewith, the white of 20 level appears being equivalent to, and the result goes wrong contrast.For this reason, the present invention the set-top box aspect propose a kind of according to monitor and set-top box between the inconsistent compensation method of DVI grey level, promptly, low inferior can easily difference of the inconsistent contrast of grey level between monitor and set-top box by the judgement of user's subjectivity, thus, but the DVI level that the selector top box sends in user UI menu.This method can be divided into DVI graphics standard pattern/DVI image spreading pattern, thus with identical shown in Fig. 4 B, in DVI graphics standard pattern, making the DVI image transitions is black 16/ white 255 the grey level numerical value that digital rgb signal level before the TMDS signal has the EIA specification, opposite to identical shown in Fig. 4 C, in DVI image spreading pattern, making the DVI image transitions is black 0/ white 255 the numerical value that digital rgb signal level before the TMDS signal has the VESA form.When supporting the situation of monitor of analog rgb and VESA DVI, the DVI image of identification input is 0-255, if set-top box output DVI level is output as 16-235, the user will see than the lower image quality of analog rgb interface contrast, this moment is with of the present invention identical, set-top box output is expanded to VESA DVI picture specification 0-255, just can address this is that.
Then, with reference to Fig. 5, to describing according to DVI image transmission method of the present invention.
Same as shown in Figure 5, according to DVI image transmission method of the present invention be, monitor that step S500 is when input DVI image transmits order by certain DVI image transmission order of user UI device from the outside input, step S501, DVI image according to input transmits order, under the microcomputer control of management and controller top box whole system, carries out image processing in video processor, and output, judge which kind of transfer mode corresponding DVI image is.
The judgement state of described DVI image model transmits order according to the certain DVI image from the outside input, differentiates the transfer mode of corresponding DVI image, differentiates step S502 selectively by user's order; In addition, when DVI connects, connect announcement information, differentiate the transfer mode of corresponding DVI image, step S503 by the DVI that transmits from numerical display device.
Promptly, described numerical display device is by under certain DVI image input/output end port and the situation that set-top box is connected, the DVI connection announcement information that transmits by DVI image input/output end port is stored in the memory not shown in the figures temporarily, in this state, receiving certain DVI image of importing from the outside by user UI device transmits when ordering, read the DVI that temporarily is stored in the buffer and connect announcement information, and therefrom extract and differentiate corresponding information, which kind of DVI image transfer mode what certain numerical display device that judgement DVI image input/output end port connects used is, described DVI image transfer mode can be distinguished and be set at: with the LCD monitor of PC series and the DVI image identification pattern of ETA specification corresponding DVI image spreading pattern and VESA DVI regulation.
Then, when judging the situation of DVI image transfer mode among step S502 or the step S504, the DVI image transfer mode according to judging carries out image processing by the video processor in the set-top box, and output, variable gradation conversion corresponding D VI image.
That is, the gray scale of the DVI image that DVI gradation of image conversion equipment will be by video processor output keep with step S505, step S507 in the DVI image transfer mode the judged step S506 that adapts, also can expand or dwindle step S508.
Specifically, set the look-up table of the gradation conversion mode that meets a plurality of DVI image transfer modes respectively, be arranged on described DVI gradation of image conversion equipment, in this state, which kind of transfer mode differentiates the DVI image is, at this moment can use the look-up table of setting the gradation conversion mode that is fit to corresponding DVI image transfer mode selectively, thus, in video processor, image is handled and exported, changeably gradation conversion corresponding D VI image.
For instance, when the DVI of numerical display device image transfer mode is during with the LCD monitor of PC series and the corresponding DVI image spreading of VESA specification pattern, described DVI gradation of image conversion equipment is converted to the 0-235 gray scale with the DVI image of the 16-235 gray scale look-up table by the gradation conversion mode set with its expansion.When being under the situation with the corresponding DVI graphics standard of EIA DVI specification pattern, walk around the DVI image of 16-235 gray scale, keep existing gray scale processing rule.
At last, or carry out gradation conversion or keep certain DVI image of original gray scale, by selecting to activate the outside outgoing route of step S509, to the certain numerical display device transfer step S510 that connects, the present invention promptly finishes.
Identical therewith, according to DVI image transmission method of the present invention, the corresponding DVI image that video display apparatus is exported carries out gray scale processing changeably, transmits, and makes it meet the DVI image transfer mode of the numerical display device that is connected with set-top box.According to the characteristic of monitor, the possibility that image quality reduction takes place in the numerical display device with mutually different DVI image transfer mode significantly reduces.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.
Therefore, the technical scope of this invention is not limited to the content on the specification, must determine its technical scope according to interest field.
Claims (5)
1, transmit the digital visual interface image in the set-top box, comprising:
First step: certain digital visual interface (digital visualinterface) image according to the outside input transmits order, differentiates the transfer mode of respective digital video interface image;
Second step: the digital visual interface image transfer mode according to differentiating in the first step, carry out image processing by the video processor in the set-top box, and output, to the variable gradation conversion of respective digital video interface image;
Third step: set-top box is by certain digital visual interface image input/output end port, with the digital video-frequency interface of greyscale transformation in second step process, be sent to numerical display device with the corresponding digital visual interface image of described digital visual interface image transfer mode transfer mode.
2, as transmitting the digital visual interface image in the claim item 1 described set-top box, it is characterized in that described first step comprises:
Transmit order according to certain digital visual interface image from the outside input, differentiate the transfer mode of respective digital video interface image, can judge selectively by user's order, in addition when digital visual interface connects, the information that also can connect announcement by the digital visual interface that transmits in the numeric display unit, the transfer mode of judgement respective digital video interface image.
3, as transmitting the digital visual interface image in the claim item 1 described set-top box, it is characterized in that its characteristics of described first step comprise:
The 1-1 step: numerical display device is by under digital visual interface image input/output end port and the situation that set-top box is connected, and the digital visual interface connection announcement information of transmission is stored to buffer temporarily;
1-2 step: transmit order according to certain digital visual interface image from the outside input, read the digital visual interface that first step is stored in the buffer temporarily and connect announcement information, and therefrom extract the digital visual interface image delivery mode information of respective digital display device;
1-3 step:, judge the transfer mode of set-top box to the respective digital video interface image of described numerical display device transmission by the digital visual interface image delivery mode information that extracts in the 1-2 step.
4, as transmitting the digital visual interface image in the claim item 1 described set-top box, it is characterized in that described its characteristics of second step comprise:
The look-up table that the gradation conversion mode that adapts with a plurality of digital visual interface image transfer modes is set respectively, in the state of having set, judge the transfer mode of digital visual interface image certain in the first step, at this moment, by the look-up table that adapts with respective digital video interface image transfer mode, gradation conversion is carried out the respective digital video interface image of image processing, output at video processor changeably.
5, set-top box digital video-frequency interface transmission device comprises:
Transmit order according to certain digital visual interface (digital visual interface) image from the outside input, under the control of the microcomputer in set-top box, the discriminating gear of the digital visual interface image transfer mode of the transfer mode of judgement respective digital video interface image;
According to the digital visual interface image transfer mode of in digital visual interface image transfer mode discriminating gear, differentiating, by the video processor in the set-top box, carry out image processing, and export, respective digital video interface image is carried out the digital visual interface gradation of image conversion equipment of variable gradation conversion;
Under the control of microcomputer, activate the image outgoing route choice device of the outside outgoing route of the digital visual interface image of gradation conversion in described digital visual interface gradation of image conversion equipment selectively;
Activate selectively according to image outgoing route choice device, will be in described digital visual interface gradation of image conversion equipment the digital visual interface image of gradation conversion be sent to the digital visual interface image output/input port of certain numerical display device of connection.
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| CNA2005100274479A CN1893635A (en) | 2005-07-01 | 2005-07-01 | Digital video-frequency interface transmission device of set-top box and method therefor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546714A (en) * | 2013-10-29 | 2014-01-29 | 深圳Tcl新技术有限公司 | Method and device for processing HDMI signal |
| CN105554587A (en) * | 2015-12-10 | 2016-05-04 | 青岛海信电器股份有限公司 | Display control method, device and display device |
| CN110276234A (en) * | 2018-03-14 | 2019-09-24 | 群光电能科技股份有限公司 | Image identification module extending box and its expansion application method |
-
2005
- 2005-07-01 CN CNA2005100274479A patent/CN1893635A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546714A (en) * | 2013-10-29 | 2014-01-29 | 深圳Tcl新技术有限公司 | Method and device for processing HDMI signal |
| CN103546714B (en) * | 2013-10-29 | 2018-03-30 | 深圳Tcl新技术有限公司 | To the method and apparatus of HDMI signal transactings |
| CN105554587A (en) * | 2015-12-10 | 2016-05-04 | 青岛海信电器股份有限公司 | Display control method, device and display device |
| CN105554587B (en) * | 2015-12-10 | 2018-08-31 | 青岛海信电器股份有限公司 | A kind of display control method, device and display device |
| CN110276234A (en) * | 2018-03-14 | 2019-09-24 | 群光电能科技股份有限公司 | Image identification module extending box and its expansion application method |
| CN110276234B (en) * | 2018-03-14 | 2023-04-18 | 群光电能科技股份有限公司 | Image identification module expansion box and expansion use method thereof |
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