CN1728809A - Conversion equipment of video format - Google Patents

Abstract

The conversion equipment is composed of following parts: detection part of input image format in use for detecting format information in time of transferring format information of input image signal as well as detecting out format information of input image by using synchronous information of image or external format information in time of not transmission; format conversion part in use for converting resolution, frame frequency, scan mode, frame ratio, color coordinates and format of chromatic aberration in inputted image signal to output format needed based on the said detected format information; compensator of attribute of display unit carrying out gray compensation and geometry compensation for converted signal; image quality adjustment part in use for adjusting quality of image. Completing functions of the said composing parts, one chip supports video signals and display devices in multiple standards so as to reduce size of hardware.

Description

Video format conversion apparatus

Technical field

The present invention relates to video format conversion apparatus, in more detail, is about handling the video of multiple input, be presented at the device in and a plurality of display, and the video of handling multiple input, convert thereof into other one or more video specification, and the device of output.

Background technology

The signal specification and the display unit of video have multiple.

Above-mentioned vision signal specification comprises traditional anolog TV signals (NTSC, PAL, SECAM etc.), VCR signal, PC signal (VGA～UXGA), also comprise up-to-date Digital Television (ATSC, DVB, ARIB) signal etc. simultaneously.According to the difference of its applicable system, many different specifications are arranged.

And, see vision signal in order to make people, display unit is divided into CRT and the projection pattern that is widely used, and the PDP (Plasma Display Panel) that develops recently, LCD numerous species such as (Liquid Crystal Display).

Along with formally beginning of digital broadcast and popularizing of Digital Television (DTV), the demand of supporting such various video specification and display unit is constantly enlarged.

And because the development of semiconducter engineering may realize SOC (System-On-Chip), the function of various complexity can both be able to thorough realization by a chip.

Digital Television (DTV) just is that with the difference of a maximum of traditional simulated television it can support multiple form in a specification.

For instance, the surface wave Digital Television (DTV) of the U.S. is play specification ATSC specification specifies for having 18 video formats, and wherein, TV station can be according to the difference of program, and the form of selecting to wish is play.

Table 1 has shown above-mentioned 18 video formats.

[table 1]

Resolution	Frame frequency/scan mode	The picture ratio	The form number
				1920*1080	24P，30P，30I	16∶9	3
1280*720	24P，30P，60P	16∶9	3
				704*480	24P，30P，30I，60P	16∶9	4
″	4∶3	4
			640*480		24P，30P，30I，60P	4∶3	4

As shown in table 1, the ATSC specification has 18 video formats, and said here video format refers to resolution, frame frequency, and scan mode and picture are than 4.

In order to transmit the signal of multiple form like this, Digital Television (DTV) radio receiver should be supported multiple pattern of the input.That is,, should have the function that support converts multiple pattern of the input to certain output format in order to conform to the form of self display unit.Digital broadcast can append to the information of video signal format in the header and transmit.

The patent of format conversion is defined as definition, frame frequency, 3 contents of scan mode by MIT patent (US 5,187,575).

Fig. 1 is the simple schematic diagram that shows above-mentioned format conversion patent content.

Show that as Fig. 1 N pattern of the input through after certain processing procedure, converts the process of N output format to.

Generally, Digital Television (DTV) provides except above-mentioned definition with format conversion portion, frame frequency, and beyond 3 kinds of the scan modes, the scheme of also having appended 4 kinds of format conversion methods of picture ratio.

So the format conversion apparatus of Digital Television (DTV) can be imported the signal of multiple form, and convert thereof into the output format of hope.It is will the input image definition, frame frequency, scan mode and picture are represented embodiment than of the output format that is converted to hope.

Fig. 2 is the composition block diagram of an example of the format conversion apparatus of common Digital Television (DTV), supposes that Digital Television (DTV) signal of RF state makes the transition by the VSB mode.

That is, carry out detection with Digital Television (DTV) signal of the VSB RF state that mode is imported transition through VSB wave detector 201 after, be input in the TS demultiplexer 202 to transmit (Transport:TS) stream mode.The program that TS demultiplexer 202 selects the user to like from a plurality of programs that are included in same channel, the program of selecting is separated into the Voice ﹠ Video bit stream of multipleization after, with video bit stream to 203 outputs of MPEG2 Video Decoder; Audio bit stream is to audio decoder 205 outputs.

MPEG2 Video Decoder 203 will remove overhead (various header information in the video bit stream of input, opening codes etc.) after pure data message in addition carries out length-changeable decoding (VariableLength Decoding:VLD), through the inverse guantization (IQ) process, inverse discrete cosine transform (Inverted Discrete Cosine Transform:IDCT) process and utilize the movement compensation process of motion vector, after being recovered to the pixel value of original picture, to 204 outputs of format conversion portion.Simultaneously, audio decoder 205 utilizes MPEG (Motion Picture Experts Group) algorithm or audio coding (AC)-3 algorithm etc., and the audio bit stream of importing is recovered to original audio signal, after simulated, exports by loud speaker.

4 kinds of format signals that format conversion portion 204 extracts out in the digital broadcast signal that is included in TV station's transmission, it is definition, frame frequency, scan mode, the picture ratio, by using them, the video format that the video conversion that input is shown becomes to be fit to (such as, 1920 * 1080 30i (16: 9), I refers to interlacing scan).

Such traditional approach supports beyond the digital play signal to also have various analog video input signals (anolog TV signals, PC signal and component (component) signal etc.), supports multiple display unit and image quality to adjust function, but has following problem.

First problem is beyond support Digital Television (DTV) signal, also to support under the situation of analog signal format converter that need be other.That is, although possessed the format conversion portion of processing Digital Television (DTV) signal,, do not have the format conversion portion of other vision signals of processing such as analog signal.So, need the other format conversion portion as Fig. 3.Fig. 3 is the composition block diagram of an embodiment of the format conversion apparatus of other vision signals of format conversion except that digital TV (DTV) signal, it has as shown in Figure 2, need append simulated television, PC signal, component signal etc. carry out the shortcoming of the format conversion portion 301 of format conversion.At this moment, in Digital Television (DTV) format conversion portion 204 and 301 li in the format conversion portion of appending, the signal of video signal of format conversion is selected output by multiplexer 302.

The 2nd problem be, supporting beyond Digital Television (DTV) signal, also supports the occasion of analog signal, do not have analog signal format information.Because in Digital Television (DTV) signal, format information and header transmit together, can extract these information out from header, still, owing to do not have these information in the analog video signal, so, need the device that can detect format information.

The 3rd problem be, supporting beyond Digital Television (DTV) Digital Television (DTV) signal, also supports the occasion of analog signal, needs chromaticity coordinates and color-difference formats transducer in addition.

Therefore, in order to address the above problem, the format conversion portion 301 among Fig. 3 is made up of the structure as Fig. 4:

For instance, input NTSC composite image signal is carried out separating of the horizontal/vertical Signal Separation same period and brightness (Y) and chrominance signal (C) in ntsc decoder 401.Then, if desired, look converter section 404 carry out chromaticity coordinates conversion (such as, YIQ → YCbCr) and color-difference formats conversion (such as, 4: 4: 4 → 4: 2: 2), then to 406 outputs of format conversion portion.

And computer PC signal VGA mouth UXGA etc. import with the RGB state by RGB input part 402, if necessary, look converter section 405 carry out chromaticity coordinates conversion (such as, RGB → YCbCr) and color-difference formats conversion (such as, 4: 4: 4 → 4: 2: 2), then to 406 outputs of format conversion portion.And component signal 480i～1080i exports to format conversion portion 406 by input part 403.

In order to handle traditional simulated television, the outer video signal of PC signal and component signal etc. as shown in Figure 4, need carry out the device of chromaticity coordinates and color-difference formats conversion.

Fig. 5 is the schematic diagram that shows the example of changing between the plurality of color coordinate.For instance, if the chromaticity coordinates of input image is GBR, the chromaticity coordinates of wishing image output is YIQ, changes according to following mathematical formulae.

[mathematical formulae 1]

$\left(\begin{array}{c}Y\\ I\\ Q\end{array}\right)=\frac{1}{256}\left(\begin{array}{ccc}150& 29& 77\\ -70& -82& 153\\ -134& 80& 54\end{array}\right)\left(\begin{array}{c}G\\ B\\ R\end{array}\right)$

$Y=\frac{1}{256}(150*G+29*B+77*R)$

$I=\frac{1}{256}(-70*G-82*B+153R)$

$Q=\frac{1}{256}(-134*G+80*B+54*R)$

The 4th problem is when supporting multiple display unit, to need extra tone correcting and geometry compensating device.Here, so-called tone correcting refers to the various distortion that take place on color (color) characteristic of display unit.Above-mentioned tone correcting is applicable in all display unit.

Also have, so-called geometry revisal refers to as Fig. 6 a to shown in Fig. 6 d, the various geometry deformations (distortion) that take place on the display unit characteristic.Especially in the CRT mode, in the projection mode, problem is more serious, and there is not such geometry problem on deformation in PDP and LCD etc.

The 5th problem is to support image quality (brightness, contrast, look, colour saturation, color temperature etc.) under the situation of the function of Tiao Zhenging, if in simulation field, adjust image quality, at analog display unit (CRT, PJTV) no problem in, in numeric display unit, owing to need with signal of video signal after the D/A conversion, adjust image quality such as PDP/LCD, through the A/D conversion, just the problem of image quality deterioration appears once more.

If it is be illustrated, as follows with reference to accompanying drawing.

Fig. 7 a shows is the block diagram that the image quality of traditional analog display unit is adjusted.

The same with Fig. 7 a, the digital signal of changing by format conversion portion 701 converts analog signal at D/ A converter section 702, and 703 carry out the image quality adjustment in the image quality adjustment part, prevent the problem of image quality deterioration.

As Fig. 7 b, the digital signal by format conversion portion 701 conversion after 702 li of D/A converter sections convert analog signal to, output, after image quality adjustment part 703 is adjusted, convert digital signal to by A/D converter section 704 once more, export, prevent the problem of image quality deterioration.

Summary of the invention

In order to solve technical problem above-mentioned, the present invention detects the video format of traditional format converter, the chromaticity coordinates conversion, the color-difference formats conversion, tone correcting, functions such as geometry revisal and image quality adjustment are integrated, realize by a chip, the size and the reduction expense of hardware can be reduced effectively, the vision signal and the demonstration of plurality of specifications can be supported.

Video format conversion apparatus of the present invention for achieving the above object consists of the following components: when transmitting the video signal format information of input, can detect format information, when not transmitting, can utilize the image signal of the being imported same period or extract foreign format information out, detect the input image format test section of the image format of importing; According to detected format information in above-mentioned input image format test section, with the signal of video signal resolution of input, frame frequency, scan mode, the picture ratio, chromaticity coordinates, color-difference formats converts the format conversion portion of desirable output format to; The signal of changing is carried out the display unit characteristic correcting section of tone correcting and geometry revisal in format conversion portion; Adjust the image quality adjustment part of the image quality of above-mentioned revisal signal.Above-mentioned element is finished by a chip.

If the signal of video signal of being imported is in the state of compression, structure also need comprise the video decode portion that it is decoded.

If wish that institute's output image signal is a compressive state, also need comprise the video encoder of the signal of video signal of compressed format conversion in the structure.

Above-mentioned input signal of video signal comprises Digital Television (DTV) play signal, analog video signal and digital video signal.

The signal of video signal of input is at least more than one, and adjusting the signal of video signal of exporting after the image quality at least also is more than one.

Above-mentioned all elements all are digital field.

Below, in addition detailed to the composition of the embodiment of the invention and effect with reference to the accompanying drawings explanation.

What Fig. 8 showed is the schematic diagram of video format conversion apparatus of the present invention.

As shown in Figure 8, input signal with plurality of specifications is an example, for digital broadcast signal (ATSC/DVB/ARIB), simulation play signal (NTSC/PAL/SECAM), the computer PC signal (VGA～UXGA), component signal (DVD, SET TOP BOX), DVI, HDMI) etc., by not needing adjunct circuit, only need to convert to the output signal of desired form, such as converting display drive signals (CRT/PDP/LCD/PJTV/PJTR) to, digital broadcast signal (ATSC/DVB/ARIB) by the video signal format conversion equipment 801 of a chip, anolog TV signals (NTSC/PAL/SECAM), the computer PC signal (VGA～UXGA), component signal (DVD, SET TOPBOX), DVI, HDMI signal etc.

That is, in above-mentioned video signal format conversion equipment 801, with existing resolution, frame frequency, scan mode, the conversion of picture ratio, the chromaticity coordinates revisal, the color-difference formats conversion, tone correcting, functions such as geometry revisal and image quality adjustment are integrated, carry out following format conversion.

1. resolution (spatial resolution): 670*480,720*480,1280*720,1920*1080 etc.

2. frame frequency (frame rate, unit: Hz): 24,30,59.94,60,80,100 etc.

3. scan mode (scan): interlacing scan (interlaced)/successively scanning (progressive)

4. picture is than (aspect ratio): 4: 3, and 14: 9,16: 9,20: 9 etc.

5. color-difference formats (chroma format): 4: 2: 0,4: 1: 1,4: 2: 2,4: 4: 4 etc.

6. chromaticity coordinates (color space): RGB, YCbCr, YUV, YIQ etc.

7. tone correcting

8. geometry revisal

9. image quality adjustment (brightness, contrast, look, colour saturation, color temperature etc.)

Above-mentioned all functions in conjunction with operation, are carried out digital processing.

Fig. 9 is the detailed cut-away view of format conversion apparatus of the present invention.

As shown in Figure 9, format conversion apparatus of the present invention consists of the following components: in order to receive the vision signal of input, carry out interface and connect, if desired, with the input signal storage in memory, the vision signal input part of the circumstances in which people get things ready for a trip of going forward side by side Coordinate Conversion and chromaticity coordinates converter section 901; Detect the video signal format test section 902 of various forms of the vision signal of input; The signal of input is if the digital broadcast signal promptly is the digital bit stream signal of compression, to its video decode portion 903 of decoding; By control part 801 control input image format and image output forms, the format conversion portion 904 that carries out format conversion; The desirable output format of user is if the digital broadcast signal, i.e. the video coding portion 905 that uses during compressive state; Corresponding with the display unit characteristic, as to carry out tone correcting and geometry revisal display unit characteristic correcting section 906; Realize brightness, contrast, look, colour saturation, the image quality adjustment part 907 that color temperature etc. are adjusted; Be used for format conversion and compensating device, the storage part 909 of video decode and coding; Control is the control part 908 of action all.

Format conversion apparatus among the present invention is in order to carry out the conversion between various video specification, and the correcting function and the image quality adjustment function that will be used for display are integrated by a module, can reach following effect.

The first, owing to be applicable to Digital Television (DTV), can reach and support also to support anolog TV signals, component signal (480i, 480p, 720p, 1080i etc.) and DVI, the effect of various video signal specifications such as HDMI signal beyond the digital play signal.

The second, by the characteristic of revisal display unit, reach the effect of supporting multiple display unit (CRT, ROJECTION, PDP, LCD etc.).

The 3rd, when reaching the image quality of adjusting display unit, prevent the effect of picture deterioration.

The 4th, by a chip Digital Television (DTV) is handled with vision signal, reach the effect that reduces hardware size and reduce expense.

Description of drawings

Fig. 1 is the schematic diagram of the format conversion apparatus of prior art.

Fig. 2 is the generalized schematic that shows Digital Television (DTV) composition of conventional art

Fig. 3 is according to conventional art, the schematic diagram of the format conversion of Digital Television (DTV) vision signal in addition

Fig. 4 is the schematic diagram of the format conversion portion of appending of displayed map 3.

Fig. 5 is the schematic diagram that shows conversion embodiment between general chromaticity coordinates.

Fig. 6 a is the schematic diagram that shows geometry deformation embodiment to Fig. 6 d.

Fig. 7 a has shown the schematic diagram of the image quality adjustment process of conventional art to Fig. 7 b.

Fig. 8 is the generalized schematic that shows the present invention's format conversion apparatus.

Fig. 9 is the detailed maps that shows format conversion apparatus of the present invention.

Figure 10 is the action flow chart of format conversion apparatus.

Figure 11 is according to the present invention, shows the schematic diagram of image quality adjustment process.

Figure 12 is according to the present invention, shows the schematic diagram of Digital Television (DTV) structure

* accompanying drawing major part symbol description *

801: video format conversion apparatus

901: vision signal input part and chromaticity coordinates converter section

902: video signal format test section 903: video decode portion

904: format conversion portion 905: video coding portion

906: display unit characteristic correcting section 907: image quality adjustment part

908: control part 909: storage part

Embodiment

Below, will the effect of the video format conversion apparatus of structure be described in detail to having as above.

The input video image of plurality of specifications passes through and suitable interfaces such as the same period and adjusting bandwidth, and exports in vision signal input part and chromaticity coordinates converter section 901, if desired, stores in the storage part 909.And chromaticity coordinates conversion if desired can be carried out the chromaticity coordinates conversion.In above-mentioned input signal of video signal,, just in video signal format test section 902, detect the form of input signal if do not comprise the format signal of importing image signal.Detected above-mentioned input signal format is outputed to control part 908.

If above-mentioned institute incoming video signal is the digital broadcast signal through overcompression, then in video decode portion 903, decode.Use MPEG2 MP@HL decoder in present embodiment video decode portion (903).

The vision signal of above-mentioned input is carried out format conversion according to the image output form that the user wishes in format conversion portion 904.That is, carry out resolution, frame frequency, scan mode, picture is 5 kinds of format conversion of color-difference formats when.

The desirable video format of user is if the digital broadcast signal condition, promptly during compression position flow, compress in video coding portion 905.

The vision signal of above-mentioned process format conversion is finished various revisals according to display unit in display unit characteristic correcting section 906.That is, carry out tone correcting and geometry revisal.

The signal of revisal is accepted to adjust parameter (parameter) by control part 908, in image quality adjustment part 907, carries out the image quality adjustment, and the signal that the image quality adjustment finishes is exported to display unit.

Figure 10 is the flow chart of execution in video signal format test section 902 and format conversion portion 904 and display unit characteristic correcting section 906.If transmit the video signal format information imported, then use its information, if do not transmit, then utilize signal or the foreign format information same period, extract out.

If the input signal of video signal, judge the signal of video signal of being imported be the digital signal digital bit stream of overcompression (for example through) or outside input (for example computer image signal) (S10).

If, be judged to be digital signal, that is, if digital broadcast, at first should detect and have or not signal of video signal (S20), there is not signal of video signal (S30) if detect, output background colour and the image of having set; If detected signal of video signal, from the signal of video signal of input, extract image format information (S40) out.Learn in the signal of video signal that the image format information that has that it's too late of signal of video signal can be decoded from video decode portion 903.

On the other hand, if be judged to be outside input because can not transport format information, detect import and have or not signal of video signal (S21) in the signal same period, do not have signal of video signal (S31) if be judged to be, the image that export background colour and set; If judging has signal of video signal,, extract the format information (S41) of the image of importing out according to the signal and the pattern of the input of the user's appointment same period of input.That is, if outside input, owing to there is not format information, need utilize signal or the same period, extract the form of the image of importing out according to user's appointment.

When importing the form of image when detecting, in control part 908, the format information of image output and the format information of above-mentioned input image are exported to format conversion portion 904 and display unit characteristic correcting section 906.

Corresponding with the form of image output for the form that makes the input image that control part 908 receives, format conversion portion 904 reads in the image of 909 li storages of storage part, transition clarity, frame frequency, scan mode, picture ratio, after the color-difference formats etc., store into once more in the above-mentioned storage part 909.On the other hand, be stored in the image in the storage part 909 after the conversion of display unit characteristic correcting section 906 reading format, carry out the chromaticity coordinates revisal, after tone correcting and the geometry revisal etc., to display unit output (S50).At this moment, owing to carry out tone correcting brightness (Y) value is changed, tone correcting also can be regarded a format conversion as.

Figure 11 is the detailed maps of explanation image quality adjustment process according to the present invention.

The format conversion portion 1010 of Figure 11 is notions that the format conversion portion 904 of Fig. 9 and display unit characteristic correcting section 906 are integrated.Digital signal by 1010 conversions of format conversion portion is carried out the image quality adjustment by digital image quality adjustment part 1020.To change in D/A converter section 1030 by the digital signal that above-mentioned digital image quality adjustment part 1020 is adjusted, and make it corresponding with analog display unit, output if display unit is a numeral, is then walked around, thus the output digital signal.

Such structure can overcome the problem of the image quality deterioration that traditional Fig. 7 structure brought effectively.

What Figure 12 showed is according to the present invention, the schematic diagram of the structure of Digital Television (DTV).

VSB wave detector 1110 among Figure 12, TS demultiplexer 1120, MPEG2 Video Decoder 1130, audio decoder 1140, Digital Television (DTV) TV format converter section 1150 part-structures such as grade are structures of conventional art illustrated in fig. 2.

In the present invention, the effect of MPEG2 Video Decoder 1130 is identical with video decode portion 903.And the effect of Digital Television (DTV) TV format converter section 1150 is expanded into to resolution frame frequency, scan mode, picture ratio, 5 kinds of format conversion of color-difference formats, form by conversion carries out tone correcting and geometry revisal in display unit correcting section 1160.Illustrated the same of face carried out the image quality adjustment by image quality adjustment part 1170 in front of the signal of display unit revisal, exports to display unit (not shown).

By above-mentioned description, relevant speciality personnel can carry out numerous variations 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 only to the content among the embodiment; And to determine its technical scope according to the claim scope of patent.

Claims (6)

1, a kind of video format conversion apparatus comprises:

When transmitting the format information of the signal of video signal of import, then detect format information, if do not transmit, the signal or the format information of the outside same period of the utilization image of importing then detects the input image format test section of the image format of importing;

According to detected format information in above-mentioned input image format test section, with the resolution of the signal of video signal imported, frame frequency, scan mode, the picture ratio, chromaticity coordinates, color-difference formats converts the format conversion portion of required output format to;

The display unit characteristic correcting section that the signal of changing in above-mentioned format conversion portion is carried out tone correcting and geometry revisal;

Adjust the image quality adjustment part of the signal image quality of above-mentioned process revisal;

Above-mentioned element is finished by a chip.

2, video format conversion apparatus as claimed in claim 1 is characterized by, if the signal of video signal of being imported is a compressive state, also comprises the video decode portion that it is decoded.

3, video format conversion apparatus as claimed in claim 1 is characterized by, if when required output image signal is compressive state, also comprises the video encoder that the signal of video signal to format conversion compresses.

4, video format conversion apparatus as claimed in claim 1 is characterized by, and above-mentioned input signal of video signal comprises Digital Television (DTV) play signal, analog video signal and digital video signal.

5, video format conversion apparatus as claimed in claim 1 is characterized by, and the signal of video signal of above-mentioned input is more than one at least, and the signal of video signal of exporting after the adjustment of process image quality at least also is more than one.

6, video format conversion apparatus as claimed in claim 1 is characterized by, and above-mentioned all elements all belong to digital field.

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