CN103546714B - To the method and apparatus of HDMI signal transactings - Google Patents
To the method and apparatus of HDMI signal transactings Download PDFInfo
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Abstract
The present invention relates to a kind of method and apparatus to HDMI signal transactings, the type of HDMI signals received is first determined when receiving HDMI signals, when the HDMI signals received are vision signal, if the signal received is not conventional YCbCr signals, the HDMI signals received are then converted into conventional YCbCr signals, and image quality processing is carried out to the conventional YCbCr signals after conversion, conventional YCbCr signals after image quality is handled are converted to conventional rgb signal and exported, it is bright in the vision signal, dark details picture will not be lost when image quality processing and output is carried out, so that the display picture contrast of video is more preferable, picture becomes apparent from.
Description
Technical field
The present invention relates to signal processing technology field, more particularly to a kind of method and apparatus to HDMI signal transactings.
Background technology
HDMI signals have YCbCr (" Y " refers to luminance component, and " Cb " refers to chroma blue component, and " Cr " refers to red chrominance component)
And RGB（R is red, G is green, B is blue）Two kinds of colour space coded systems, YCbCr are mainly used in video playback and shown, RGB is then mainly used in
Computer desktop is shown.In video playback apparatus, the YCbCr coding regulations Y of 8 is between 16 to 235, and Cb and Cr are between 16
To between 240, commonly referred to as Limited Range（Limited range）.And in computer display device, the RGB coding rule of 8
R/G/B is determined between 0 to 255, commonly referred to as Full Range（Infinite range）.But related routine also provides, 8
YCbCr, RGB can also respectively with Full Range, Limited Range encode.When YCbCr is encoded with Full Range,
Y/Cb/Cr is between 0 to 255；When RGB is encoded with Limited Range, R/G/B is between 16 to 235.
By the display tagsort of HDMI signals, two kinds of desktop signals, vision signal can be divided into.Desktop signals such as net
The signal of page, browser, application interface, game etc., then such as disc player, set top box, video camera, computer are full frame broadcasts for vision signal
Put the signals such as video.For various HDMI output equipments, its vision signal has conventional YCbCr signals（YCbCr_16~
235）, unconventional YCbCr signals（YCbCr_0~255）, conventional rgb signal（RGB_0~255）With unconventional rgb signal
（RGB_16~235）Four kinds of coded systems, desktop signals have RGB_0~255 and RGB_16~235 two kind coded system.Typically
For, vision signal will have corresponding " picture quality enhancement " processing procedure, and desktop signals are particular about reproducibility, are not required to do picture quality enhancement
Processing.
Existing way is usually first identification signal type（RGB/YCbCr）, rgb signal is unified to be handled by 0~255,
YCbCr signals are unified by 16~235 processing（I.e. unconventional signal and normal signal are handled according to normal signal）.But problem
It is, it is bright in display picture, dark details is equal if 16~235 rgb signal directly carries out output processing by 0~255 signal
Nothing, cause contrast inadequate, picture covers partially, lacks unity and coherence, and if 0~255 YCbCr signals directly press 16~235 signals
Carry out picture quality enhancement processing, then 0~16 by 16 processing, and 235~255 by 235 processing, and bright, dark information reamed, cause it is bright,
Dark picture detail is lost, and picture contrast is poor, causes the display effect of HDMI signals poor.
The content of the invention
The main object of the present invention is to provide a kind of method and apparatus to HDMI signal transactings so that terminal HDMI signals
Display effect it is more preferable.
The present invention proposes a kind of method to HDMI signal transactings, including：
The HDMI signals that detecting HDMI receives, it is determined that the type of the HDMI signals detected；
When the HDMI signals detected are vision signal, and when not being conventional YCbCr signals, the HDMI signals that will detect
Be converted to conventional YCbCr signals；
To after conversion conventional YCbCr signals carry out image quality processing, and by carry out image quality processing after conventional YCbCr signals
Be converted to conventional rgb signal and export.
Preferably, also include after the step of type of the HDMI signals for determining to detect：
When the HDMI signals detected are desktop signals, and when being unconventional rgb signal, the HDMI signals that will be detected turn
It is changed to conventional rgb signal and exports.
When the HDMI signals detected are desktop signals, and when being conventional rgb signal, the HDMI letters detected are directly exported
Number.
Preferably, the HDMI signals that the detecting HDMI receives, it is determined that the type of the HDMI signals detected
Also include after step：
When the HDMI signals detected are vision signal, and when being conventional YCbCr signals, the HDMI signals detected are entered
The processing of row image quality, and the conventional YCbCr signals after progress image quality processing are converted into conventional rgb signal and exported.
Preferably, the described the step of HDMI signals detected are converted into conventional YCbCr signals, includes：
If the HDMI signals detected are conventional rgb signal, conventional rgb signal is converted into conventional YCbCr signals；
To after conversion conventional YCbCr signals carry out image quality processing, and by carry out image quality processing after conventional YCbCr signals
Be converted to conventional rgb signal and export.
Preferably, the described the step of HDMI signals detected are converted into conventional YCbCr signals, also includes：
If the HDMI signals are unconventional rgb signal, the HDMI signals are converted into conventional rgb signal；
Conventional rgb signal is converted into conventional YCbCr signals；
To after conversion conventional YCbCr signals carry out image quality processing, and by carry out image quality processing after conventional YCbCr signals
Be converted to conventional rgb signal and export.
Preferably, the described the step of HDMI signals detected are converted into conventional YCbCr signals also include：
If the HDMI signals detected are not rgb signals, the HDMI signals detected are converted into conventional YCbCr and believed
Number；
To after conversion conventional YCbCr signals carry out image quality processing, and by carry out image quality processing after conventional YCbCr signals
Be converted to conventional rgb signal and export.
Preferably, after the step of HDMI signals that the detecting HDMI receives, this method also includes：
The signal processing model of terminal where determining HDMI；
If it is determined that the signal processing model of terminal is video mode where HDMI, then the HDMI signals detected are judged
Whether it is conventional YCbCr signals；
When the HDMI signals detected are not conventional YCbCr signals, the HDMI signals detected are converted into routine
YCbCr signals；
To after conversion conventional YCbCr signals carry out image quality processing, and by carry out image quality processing after conventional YCbCr signals
Be converted to conventional rgb signal and export.
Preferably, after where the determination HDMI the step of signal processing model of terminal, this method also includes：
If it is determined that the signal processing model of terminal is desktop where HDMI, then the HDMI signals received are judged
Whether it is conventional rgb signal；
When the HDMI signals detected are not conventional rgb signals, then the HDMI signals detected are converted into conventional RGB believes
Number and export；
If the HDMI signals detected are conventional rgb signals, the HDMI signals received are directly exported.
Preferably, after where the determination HDMI the step of signal processing model of terminal, this method also includes：
If it is determined that the signal processing model of terminal is automatic identification model where HDMI, it is determined that the HDMI detected
The type of signal.
The present invention also proposes a kind of device to HDMI signal transactings, including：
Detecting module, the HDMI signals received for detecting HDMI；
Determining module, for the type for the HDMI signals for determining to detect
Modular converter, for the HDMI signals that when the HDMI signals detected are not conventional YCbCr signals, will be detected
Be converted to conventional YCbCr signals；
Processing module, for carrying out image quality processing to the conventional YCbCr signals after conversion；
The modular converter is additionally operable to the conventional YCbCr signals after progress image quality processing being converted to conventional rgb signal；
Output module, for exporting the conventional rgb signal after changing.
The present invention proposes a kind of method and apparatus to HDMI signal transactings, first determines to receive when receiving HDMI signals
The type of the HDMI signals arrived, when the HDMI signals received are vision signal, if the signal received is not conventional YCbCr
Signal, then the HDMI signals received are converted into conventional YCbCr signals, and picture is carried out to the conventional YCbCr signals after conversion
Matter processing, the conventional YCbCr signals after image quality is handled are converted to conventional rgb signal and exported, bright, dark in the vision signal
Details picture will not be lost when image quality processing and output is carried out so that the display picture contrast of video is more preferable, picture
Become apparent from.
Brief description of the drawings
Fig. 1 is schematic flow sheet of the present invention to the method first embodiment of HDMI signal transactings；
Fig. 2 is schematic flow sheet of the present invention to the method second embodiment of HDMI signal transactings；
Fig. 3 is schematic flow sheet of the present invention to the method 3rd embodiment of HDMI signal transactings；
Fig. 4 is the idiographic flow schematic diagram of step S30 first embodiments in Fig. 1；
Fig. 5 is the idiographic flow schematic diagram of step S30 second embodiments in Fig. 1；
Fig. 6 is the idiographic flow schematic diagram of step S30 second embodiments in Fig. 1；
Fig. 7 is schematic flow sheet of the present invention to the method fourth embodiment of HDMI signal transactings；
Fig. 8 is schematic flow sheet of the present invention to the embodiment of method the 5th of HDMI signal transactings；
Fig. 9 is schematic flow sheet of the present invention to the method sixth embodiment of HDMI signal transactings；
Figure 10 is the schematic flow sheet of device preferred embodiment of the present invention to HDMI signal transactings.
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described further with regard to technical scheme.It should be appreciated that this
The specific embodiment of place description is not intended to limit the present invention only to explain the present invention.
Reference picture 1, Fig. 1 are schematic flow sheet of the present invention to the method first embodiment of HDMI signal transactings.
The present embodiment proposes a kind of method first embodiment to HDMI signal transactings, including：
Step S10, the HDMI signals that detecting HDMI receives；
Step S20, it is determined that the type of the HDMI signals detected；
Step S30, when the HDMI signals detected are vision signal, and when not being conventional YCbCr signals, by what is detected
HDMI signals are converted to conventional YCbCr signals；
The type of HDMI signals includes YCbCr signals and rgb signal in the present embodiment, and YCbCr signals include routine
YCbCr signals and unconventional YCbCr signals, rgb signal include conventional rgb signal and unconventional rgb signal, conventional YCbCr letters
Number and unconventional YCbCr signals refer to the signal that YCbCr_16~235 and YCbCr_0~255 are respectively adopted to encode, it is and conventional
Rgb signal and unconventional rgb signal refer to the signal for being respectively adopted that RGB_0~255 and RGB_16~235 encode.
The type of HDMI signals can be determined according to ITC, CN1 and CN0 flag in HDMI signals, only work as ITC/
The HDMI signals are vision signal during CN1/CN0=1/0/0, and the HDMI signals received during other situations are all desktop signals, table
Face signal refers to the signals such as local video, computer desktop, game and webpage.
In the present embodiment when the HDMI signals that detect be vision signal, and when not being conventional YCbCr signals, the HDMI believes
Number can be unconventional YCbCr, conventional rgb signal and unconventional rgb signal three types signal.In the HDMI that judgement receives
When whether signal is conventional YCbCr signals, the HDMI signals that detect first can be judged according to Y1 the and Y0 flags of HDMI signals
Whether it is YCbCr signals, if Y1/Y0=1/0 or 0/1 in HDMI signals, the HDMI signals detected are YCbCr signals, so
Whether it is afterwards conventional YCbCr signals according to the YQ1 of the HDMI signals and YQ0 HDMI signals for judging to receive, when YQ1/YQ0=0/0
When the HDMI signals that detect be conventional YCbCr signals, as YQ1/YQ0=0/1, the HDMI signals detected are unconventional
YCbCr signals, then the unconventional YCbCr signals are converted into conventional YCbCr signals；If Y1/Y0=0/0, illustrate what is detected
HDMI signals are rgb signal, then the rgb signal are converted into conventional YCbCr signals.
Step S40, to after conversion conventional YCbCr signals carry out image quality processing, and by carry out image quality processing after routine
YCbCr signals are converted to conventional rgb signal and exported.
Image quality processing refers to the processing such as the definition to video, noise reduction, color enhancing and dynamic contrast.Existing end
It is that YCbCr signals is unified routinely when holding such as disc player, television set and computer to vision signal and carrying out image quality processing
YCbCr signals are handled, i.e., according to the coded system of YCbCr_16~235, and for using the coded system of YCbCr_0~255
Unconventional YCbCr then occur in YCbCr signals 0~16 by 16 processing, 235~255 by 235 processing situations,
Cause dark, the bright loss in detail of picture, and when carrying out picture quality enhancement to vision signal, the vision signal is necessary for YCbCr
Signal, then unconventional YCbCr signals are converted into conventional YCbCr signals so that picture contrast is more strengthened when being shown
It is strong, and become apparent from.
It is as follows by the formula that YCbCr signals are converted to rgb signal：
Wherein, R be red chrominance component, G be green chroma component, B is chroma blue component, and Y is luminance component, and Cb is
Chroma blue component, Cr are red chrominance component.
Conventional YCbCr signals can be converted to by conventional rgb signal by the formula, the conventional rgb signal can pass through low pressure
Divide difference output, low pressure divides poor the advantages of exporting with low-power consumption, low error rate, low crosstalk and Low emissivity.
The method to HDMI signal transactings that the present embodiment proposes, first determines what is received when receiving HDMI signals
The type of HDMI signals, when the HDMI signals received are vision signal, if the signal received is not conventional YCbCr letters
Number, then the HDMI signals received are converted into conventional YCbCr signals, and image quality is carried out to the conventional YCbCr signals after conversion
Processing, the conventional YCbCr signals after image quality is handled are converted to conventional rgb signal and exported, bright, dark thin in the vision signal
Section picture will not be lost when image quality processing and output is carried out so that the display picture contrast of video is more preferable, and picture is more
It is clear to add.
Reference picture 2, Fig. 2 are schematic flow sheet of the present invention to the method second embodiment of HDMI signal transactings.
Method second embodiment of the present invention to HDMI signal transactings is proposed based on first embodiment, walked in the present embodiment
Also include after rapid S20：
Step S50, when the HDMI signals detected are desktop signals, whether the signal for judging to detect is conventional RGB
Signal；
Step S60, when the signal detected is unconventional rgb signal, the HDMI signals detected are converted into routine
Rgb signal simultaneously exports；
Step S70, when the signal detected is conventional rgb signal, directly export the HDMI signals detected.
Desktop signals refer to the signals such as local video, computer desktop, game and webpage, only including conventional rgb signal and non-
Conventional rgb signal two types, when judging the HDMI signals for desktop signals according to the flag of HDMI signals（Such as ITC/
CN1/CN0=0/0/0）When, whether can be conventional rgb signal according to the signal that flag Q1 and Q0 numerical value judge to receive, when
The HDMI signals received during Q1/Q0=1/0 are conventional rgb signal, now directly export the HDMI signals detected.Work as Q1/
The HDMI signals received during Q0=0/1 are unconventional rgb signal, will be connect when the HDMI signals received are unconventional signal
The HDMI signals received are converted to conventional rgb signal, and the formula that unconventional rgb signal is converted to conventional rgb signal is as follows：
Wherein, k1=255/ (235-16), R are red chrominance component, G is green chroma component, and B is chroma blue component.
It is whole when carrying out output processing to rgb signal because unconventional rgb signal is using the coded system of RGB_16~235
End is that the coded system of RGB_0~255 is handled using RGB as conventional rgb signal, causes the equal nothing of bright dark details, bright picture
Not bright enough and dark picture is not dark enough, causes contrast inadequate, picture lacks unity and coherence.
In the present embodiment, the type of HDMI signals received is first determined when receiving HDMI signals, when receiving
HDMI signals when being desktop signals, desktop signals are converted into conventional rgb signal and exported, because desktop signals are noted in display
Escheat originality need not carry out image quality processing, and vision signal needs progress image quality processing to make its display effect more preferable, passes through area
Divide the type of HDMI signals and correspondingly handled so that the display effect of the signal received is more preferable.
Reference picture 3, Fig. 3 are schematic flow sheet of the present invention to the method 3rd embodiment of HDMI signal transactings.
Method 3rd embodiment of the present invention to HDMI signal transactings is proposed based on first embodiment, in the present embodiment,
Also include after step S20：
Step S80, when the HDMI signals detected are vision signal, and when being conventional YCbCr signals, to what is detected
HDMI signals carry out image quality processing, and are converted to conventional rgb signal and defeated by the conventional YCbCr signals after image quality processing are carried out
Go out.
The HDMI signals detected as YQ1/YQ0=0/0 are conventional YCbCr signals, now need not be to detecting
HDMI signals are changed directly carries out image quality processing to the HDMI signals, and the HDMI signals after image quality processing are converted to
Conventional rgb signal simultaneously exports, and the method that HDMI signals are converted to conventional rgb signal is shown in formula（1）, due to conventional YCbCr signals
For the coded system of YCbCr_16~235, the problem of processing is not in bright, dark loss in detail directly is carried out to it.
Reference picture 4, Fig. 4 are the idiographic flow schematic diagram of step S30 first embodiments in Fig. 1.
In the present invention in the method first embodiment of HDMI signal transactings, step S30 includes：
Step S31, when the HDMI signals detected are vision signal, and the HDMI signals detected are conventional rgb signal,
Conventional rgb signal is then converted into conventional YCbCr signals；
When whether the HDMI signals for judging to receive are conventional rgb signal, first can be marked according to the Y1 of HDMI signals and Y0
Know whether the HDMI signals that position judges to detect are rgb signal, if Y1/Y0=0/0, the HDMI signals for illustrating to detect are RGB
Signal, whether the signal for now judging to receive according to the numerical value of the Q1 and Q0 flags of the HDMI signals is conventional rgb signal,
The HDMI signals received as Q1/Q0=1/0 are conventional rgb signal, then the conventional rgb signal are converted directly into routine
YCbCr signals, conversion method are shown in formula（3）.
Step S32, to after conversion conventional YCbCr signals carry out image quality processing, and by carry out image quality processing after routine
YCbCr signals are converted to conventional rgb signal and exported.
Reference picture 5, Fig. 5 are the idiographic flow schematic diagram of step S30 second embodiments in Fig. 1.
In the present invention in the method first embodiment of HDMI signal transactings, step S30 includes：
Step S33, when the HDMI signals detected are vision signal, and the HDMI signals are unconventional rgb signal, then
The HDMI signals are converted into conventional rgb signal；
Step S34, conventional rgb signal is converted into conventional YCbCr signals；
The formula that conventional rgb signal is converted to conventional YCbCr signals is as follows：
Wherein, R be red chrominance component, G be green chroma component, B is chroma blue component, and Y is luminance component, and Cb is
Chroma blue component, Cr are red chrominance component.
The HDMI signals received as Q1/Q0=0/1 are unconventional rgb signal, and the HDMI signals that will now detect turn
Conventional rgb signal is changed to, because unconventional rgb signal is different from the value of R, G, B in conventional rgb signal, unconventional RGB is believed
Error occurs when number being directly converted to conventional YCbCr signals according to formula (3), causes HDMI signals color occur in display
Deviation, now need to use formula（2）Unconventional rgb signal is first converted into conventional rgb signal, then by conventional rgb signal
According to formula（3）Switch to for conventional YCbCr signals.
Step S32, to after conversion conventional YCbCr signals carry out image quality processing, and by carry out image quality processing after routine
YCbCr signals are converted to conventional rgb signal and exported.
Reference picture 6, Fig. 6 are the idiographic flow schematic diagram of step S30 second embodiments in Fig. 1.
In the present invention in the method first embodiment of HDMI signal transactings, step S30 includes：
Step S35, if the HDMI signals detected are not rgb signals, the HDMI signals detected are converted into routine
YCbCr signals；
If the HDMI signals detected in the present embodiment are not rgb signal and are not conventional YCbCr signals, the signal
For unconventional YCbCr signals, when whether the HDMI signals for judging to receive are conventional YCbCr signals, first can be believed according to HDMI
Number Y1 and Y0 flags judge whether the HDMI signals that detect are YCbCr signals, if in HDMI signals Y1/Y0=1/0 or
0/1, then the HDMI signals detected are YCbCr signals, and the HDMI received is then judged according to the YQ1 of HDMI signals and YQ0
Whether signal is conventional YCbCr signals, and as YQ1/YQ0=0/1, the HDMI signals detected are unconventional YCbCr signals, then
The unconventional YCbCr signals are converted into conventional YCbCr signals, unconventional YCbCr signals are converted into conventional YCbCr signals
Formula is as follows：
Wherein, k2=(235-16)/255, Y is luminance component, and Cb is chroma blue component, and Cr is red chrominance component..
Step S32, to after conversion conventional YCbCr signals carry out image quality processing, and by carry out image quality processing after routine
YCbCr signals are converted to conventional rgb signal and exported.
Reference picture 7, Fig. 7 are schematic flow sheet of the present invention to the method fourth embodiment of HDMI signal transactings.
Method fourth embodiment of the present invention to HDMI signal transactings is proposed based on first to 3rd embodiment, in this implementation
Also include after step S10 in example：
Step S90, the signal processing model of terminal where determining HDMI；
Step S100, if the signal processing model of terminal is video mode where HDMI, judge what is detected
Whether HDMI signals are conventional YCbCr signals；
When the HDMI signals detected are not conventional YCbCr signals, then step S30 is performed, the HDMI detected is believed
Number be converted to conventional YCbCr signals；
Step S40, to after conversion conventional YCbCr signals carry out image quality processing, and by carry out image quality processing after routine
YCbCr signals are converted to conventional rgb signal and exported.
The predeterminable terminal of user in the present embodiment（Disc player, computer etc.）Signal processing model, the signal processing model
Including video mode, handled, that is, worked as by vision signal no matter the signal detected is vision signal or desktop signals
The HDMI signals detected are not conventional YCbCr signals, the HDMI signals that will be detected（Unconventional YCbCr signals, conventional RGB
Signal and unconventional rgb signal）Be converted to conventional YCbCr signals and carry out image quality processing, after then carrying out image quality processing
Conventional YCbCr signals be converted to conventional rgb signal and export, suitable for terminal input HDMI signals be only vision signal
When, the deterministic process of HDMI signal types can be omitted, the processing to HDMI signals is quicker, saves overhead, and can
The tupe of HDMI signals, user experience height are independently selected by user.
Reference picture 8, Fig. 8 are schematic flow sheet of the present invention to the embodiment of method the 5th of HDMI signal transactings.
Method fiveth embodiment of the present invention to HDMI signal transactings is proposed based on fourth embodiment, walked in the present embodiment
Also include after rapid S90：
If it is determined that the signal processing model of terminal is desktop where HDMI, then step S50 is performed, judges to receive
To HDMI signals whether be conventional rgb signal；
Step S60, when the HDMI signals detected are not conventional rgb signals, then the HDMI signals detected are converted to
Conventional rgb signal simultaneously exports；
Step S70, if the HDMI signals detected are conventional rgb signals, directly export the HDMI signals received.
Under desktop, no matter the signal detected be vision signal or desktop signals by desktop signals at
Reason, i.e., when the HDMI signals detected is are not conventional rgb signals, the HDMI signals that will detect（Unconventional rgb signal,
Conventional YCbCr signals and unconventional YCbCr signals）Be converted to conventional rgb signal and export, wherein, unconventional YCbCr is believed
Number be converted to before conventional rgb signal, it is necessary to first according to formula（4）Unconventional YCbCr signals are converted into conventional YCbCr letters
Number, then according to formula（1）Conventional YCbCr signals are converted into conventional rgb signal.
When the HDMI signals that the scheme that the present embodiment proposes is applied to terminal input are only desktop signals, HDMI letters can be omitted
The deterministic process of number type, the processing to HDMI signals is quicker, saves overhead, and can independently be selected by user
The tupe of HDMI signals, user experience are high.
Reference picture 9, Fig. 9 are schematic flow sheet of the present invention to the method sixth embodiment of HDMI signal transactings.
Method sixth embodiment of the present invention to HDMI signal transactings is proposed based on fourth embodiment and the 5th embodiment,
Also include after step S90 in the present embodiment：
If it is determined that the signal processing model of terminal is automatic identification model where HDMI, then step S20 is performed, it is determined that
The type of the HDMI signals detected；
Step S30, when the HDMI signals detected are vision signal, and when not being conventional YCbCr signals, by what is detected
HDMI signals are converted to conventional YCbCr signals；
Step S40, to after conversion conventional YCbCr signals carry out image quality processing, and by carry out image quality processing after routine
YCbCr signals are converted to conventional rgb signal and exported.
Under automatic identification model, the HDMI signals that detected can be identified for terminal, because desktop signals are focused on believing
Number reproducibility, then need not carry out picture quality enhancement processing to desktop signals, and vision signal then needs to strengthen display effect
Corresponding picture quality enhancement processing is carried out, HDMI signals are entered according to the type of the HDMI signals detected under adaptive model
Row is correspondingly handled so that the display effect of terminal-pair HDMI signals is more preferable, and in the present embodiment, can independently be selected by user
The tupe of HDMI signals is selected, user experience is high.
Reference picture 10, Figure 10 are the schematic flow sheet of device preferred embodiment of the present invention to HDMI signal transactings.
The present embodiment proposes a kind of device to HDMI signal transactings, including：
Detecting module 10, the HDMI signals received for detecting HDMI；
Determining module 20, for the type for the HDMI signals for determining to detect
Modular converter 30, for being vision signal when detecting HDMI signals, and HDMI signals are not conventional YCbCr signals
When, the HDMI signals detected are converted into conventional YCbCr signals；
The type of HDMI signals includes YCbCr signals and rgb signal in the present embodiment, and YCbCr signals include routine
YCbCr signals and unconventional YCbCr signals, rgb signal include conventional rgb signal and unconventional rgb signal, conventional YCbCr letters
Number and unconventional YCbCr signals refer to the signal that YCbCr_16~235 and YCbCr_0~255 are respectively adopted to encode, it is and conventional
Rgb signal and unconventional rgb signal refer to the signal for being respectively adopted that RGB_0~255 and RGB_16~235 encode.
The type of HDMI signals can be determined according to ITC, CN1 and CN0 flag in HDMI signals, only work as ITC/
The HDMI signals are vision signal during CN1/CN0=1/0/0, and the HDMI signals received during other situations are all desktop signals, table
Face signal refers to the signals such as local video, computer desktop, game and webpage.
In the present embodiment when the HDMI signals that detect be vision signal, and when not being conventional YCbCr signals, the HDMI believes
Number can be unconventional YCbCr, conventional rgb signal and unconventional rgb signal three types signal.In the HDMI that judgement receives
When whether signal is conventional YCbCr signals, the HDMI signals that detect first can be judged according to Y1 the and Y0 flags of HDMI signals
Whether it is YCbCr signals, if Y1/Y0=1/0 or 0/1 in HDMI signals, the HDMI signals detected are YCbCr signals, so
Whether it is afterwards conventional YCbCr signals according to the YQ1 of the HDMI signals and YQ0 HDMI signals for judging to receive, when YQ1/YQ0=0/0
When the HDMI signals that detect be conventional YCbCr signals, as YQ1/YQ0=0/1, the HDMI signals detected are unconventional
YCbCr signals, then the unconventional YCbCr signals are converted into conventional YCbCr signals；If Y1/Y0=0/0, illustrate what is detected
HDMI signals are rgb signal, then the rgb signal are converted into conventional YCbCr signals.
Processing module 40, for carrying out image quality processing to the conventional YCbCr signals after conversion；
The modular converter 30 is additionally operable to the conventional YCbCr signals after progress image quality processing being converted to conventional rgb signal；
Output module 50, for exporting the conventional rgb signal after changing.
Image quality processing refers to the processing such as the definition to video, noise reduction, color enhancing and dynamic contrast.Existing end
It is that YCbCr signals is unified routinely when holding such as disc player, television set and computer to vision signal and carrying out image quality processing
YCbCr signals are handled, i.e., according to the coded system of YCbCr_16~235, and for using the coded system of YCbCr_0~255
Unconventional YCbCr then occur in YCbCr signals 0~16 by 16 processing, 235~255 by 235 processing situations,
Cause dark, the bright loss in detail of picture, and when carrying out picture quality enhancement to vision signal, the vision signal is necessary for YCbCr
Signal, then unconventional YCbCr signals are converted into conventional YCbCr signals so that picture contrast is more strengthened when being shown
It is strong, and become apparent from.
It is as follows by the formula that YCbCr signals are converted to rgb signal：
Wherein, R be red chrominance component, G be green chroma component, B is chroma blue component, and Y is luminance component, and Cb is
Chroma blue component, Cr are red chrominance component.
Conventional YCbCr signals can be converted to by conventional rgb signal by the formula, the conventional rgb signal can pass through low pressure
Divide difference output, low pressure divides poor the advantages of exporting with low-power consumption, low error rate, low crosstalk and Low emissivity.
The device to HDMI signal transactings that the present embodiment proposes, first determines what is received when receiving HDMI signals
The type of HDMI signals, when the HDMI signals received are vision signal, if the signal received is not conventional YCbCr letters
Number, then the HDMI signals received are converted into conventional YCbCr signals, and image quality is carried out to the conventional YCbCr signals after conversion
Processing, the conventional YCbCr signals after image quality is handled are converted to conventional rgb signal and exported, bright, dark thin in the vision signal
Section picture will not be lost when image quality processing and output is carried out so that the display picture contrast of video is more preferable, and picture is more
It is clear to add.
In the present invention in the device preferred embodiment of HDMI signal transactings, modular converter 30 is additionally operable to work as what is detected
HDMI signals are desktop signals, and when being unconventional rgb signal, the HDMI signals detected are converted into conventional rgb signal, institute
Output module 50 is stated to be additionally operable to when the signal detected is conventional rgb signal, connect the HDMI signals that output detects.
Desktop signals refer to the signals such as local video, computer desktop, game and webpage, only including conventional rgb signal and non-
Conventional rgb signal two types, when judging the HDMI signals for desktop signals according to the flag of HDMI signals（Such as ITC/
CN1/CN0=0/0/0）When, whether can be conventional rgb signal according to the signal that flag Q1 and Q0 numerical value judge to receive, when
The HDMI signals received during Q1/Q0=1/0 are conventional rgb signal, now directly export the HDMI signals detected.Work as Q1/
The HDMI signals received during Q0=0/1 are unconventional rgb signal, are changed when the HDMI signals received are unconventional signal
The HDMI signals received are converted to conventional rgb signal by module 30, and unconventional rgb signal is converted to routine by modular converter 30
The formula of rgb signal is as follows：
Wherein k1=255/ (235-16), R is red chrominance component, G is green chroma component, and B is chroma blue component.
Because non-rgb signal is using the coded system of RGB_16~235, when carrying out output processing to rgb signal, terminal is equal
It is that the coded system of RGB_0~255 is handled using RGB as conventional rgb signal, causes the equal nothing of bright dark details, bright picture is inadequate
Bright and dark picture is not dark enough, causes contrast inadequate, picture lacks unity and coherence.
In the present embodiment, the type of HDMI signals received is first determined when receiving HDMI signals, when receiving
HDMI signals when being desktop signals, desktop signals are converted to conventional rgb signal, output module output conversion by modular converter 30
Conventional rgb signal afterwards, image quality processing need not be carried out by focusing on reproducibility in display due to desktop signals, and vision signal needs
Carrying out image quality processing makes its display effect more preferable, by distinguishing the type of HDMI signals and correspondingly being handled so that connect
The display effect of the signal received is more preferable.
In the present invention in the device preferred embodiment of HDMI signal transactings, the processing module 40 is additionally operable to work as and detected
HDMI signals be vision signal, and when being conventional YCbCr signals, image quality processing is carried out to the HDMI signals detected.
The HDMI signals detected as YQ1/YQ0=0/0 are conventional YCbCr signals, now modular converter 30 need not pair
The HDMI signals detected are changed, and processing module 40 directly carries out image quality processing to the HDMI signals, and modular converter 30 will
HDMI signals after image quality processing are converted to conventional rgb signal and exported by output module 50, and modular converter 30 is by HDMI
The method that signal is converted to conventional rgb signal is shown in formula（1）, because conventional YCbCr signals are the coding staff of YCbCr_16~235
Formula, the problem of processing is not in bright, dark loss in detail directly is carried out to it.
In the present invention in the device preferred embodiment of HDMI signal transactings, if the modular converter 30 is additionally operable to detect
HDMI signals be vision signal, and when being conventional rgb signal, then conventional rgb signal is converted into conventional YCbCr signals.
, can be first according to the Y1 and Y0 of HDMI signals when whether the HDMI signals for judging to receive are conventional YCbCr signals
Whether the HDMI signals that flag judges to detect are YCbCr signals, if Y1/Y0=0/0, illustrate the HDMI signals detected
For rgb signal, whether the signal for now judging to receive according to the numerical value of the Q1 and Q0 flags of the HDMI signals is conventional RGB
Signal, the HDMI signals received as Q1/Q0=1/0 are conventional rgb signal, then are converted directly into the conventional rgb signal often
YCbCr signals are advised, conversion method is shown in formula（3）.
In the present invention in the device preferred embodiment of HDMI signal transactings, the modular converter 30 is additionally operable to when described
HDMI signals are vision signal, and when being unconventional rgb signal, the HDMI signals are converted into conventional rgb signal, and will be normal
Rule rgb signal is converted to conventional YCbCr signals.
The formula that conventional rgb signal is converted to conventional YCbCr signals is as follows：
Wherein, R be red chrominance component, G be green chroma component, B is chroma blue component, and Y is luminance component, and Cb is
Chroma blue component, Cr are red chrominance component.
The HDMI signals received as Q1/Q0=0/1 are unconventional rgb signal, and the HDMI signals that will now detect turn
Conventional rgb signal is changed to, because unconventional rgb signal is different from the value of R, G, B in conventional rgb signal, unconventional RGB is believed
Error occurs when number being directly converted to conventional YCbCr signals according to formula (3), causes HDMI signals color occur in display
Deviation, now need first to use formula（2）Unconventional rgb signal is converted into conventional rgb signal, then by conventional rgb signal
According to formula（3）Switch to for conventional YCbCr signals.
In the present invention in the device preferred embodiment of HDMI signal transactings, if the HDMI signals detected are video letter
Number, and when being unconventional YCbCr signals, the HDMI signals detected are converted into conventional YCbCr signals.
If the HDMI signals detected in the present embodiment are unconventional YCbCr signals, in the HDMI letters for judging to receive
Whether when number being conventional YCbCr signals, the HDMI signals that first can judge detect according to Y1 the and Y0 flags of HDMI signals are
No is YCbCr signals, if Y1/Y0=1/0 or 0/1 in HDMI signals, the HDMI signals detected are YCbCr signals, then
Whether it is conventional YCbCr signals according to the YQ1 of the HDMI signals and YQ0 HDMI signals for judging to receive, when YQ1/YQ0=0/1
When, the HDMI signals detected are unconventional YCbCr signals, then the unconventional YCbCr signals are converted into conventional YCbCr believes
Number, the formula that unconventional YCbCr signals are converted to conventional YCbCr signals is as follows：
Wherein, k2=(235-16)/255, Y is luminance component, and Cb is chroma blue component, and Cr is red chrominance component..
In the present invention in the device preferred embodiment of HDMI signal transactings, the determining module 20 is additionally operable to determine HDMI
The signal processing model of terminal where interface；If it is determined that the signal processing model of terminal is video mode where HDMI, and
When the HDMI signals detected are not conventional YCbCr signals, the HDMI signals detected are converted to routine by modular converter 30
YCbCr signals.
The predeterminable terminal of user in the present embodiment（Disc player, computer etc.）Signal processing model, the signal processing model
Including video mode, handled, that is, worked as by vision signal no matter the signal detected is vision signal or desktop signals
The HDMI signals detected are not conventional YCbCr signals, the HDMI signals that will be detected（Unconventional YCbCr signals, conventional RGB
Signal and unconventional rgb signal）Be converted to conventional YCbCr signals and carry out image quality processing, after then carrying out image quality processing
Conventional YCbCr signals be converted to conventional rgb signal and export, suitable for terminal input HDMI signals be only vision signal
When, the deterministic process of HDMI signal types can be omitted, the processing to HDMI signals is quicker, saves overhead, and can
The tupe of HDMI signals, user experience height are independently selected by user.
In the present invention in the device preferred embodiment of HDMI signal transactings, however, it is determined that module 20 is determined where HDMI
The signal processing model of terminal is desktop, and when the HDMI signals detected are not conventional rgb signals, modular converter 30 will
The HDMI signals detected are converted to conventional rgb signal and exported；If the HDMI signals detected are conventional rgb signals, output
Module 50 directly exports the HDMI signals received.
Under desktop, no matter the signal detected be vision signal or desktop signals by desktop signals at
Reason, i.e., when the HDMI signals detected is are not conventional rgb signals, the HDMI signals that will detect（Unconventional rgb signal,
Conventional YCbCr signals and unconventional YCbCr signals）Be converted to conventional rgb signal and export, wherein, unconventional YCbCr is believed
Number be converted to before conventional rgb signal, it is necessary to first according to formula（4）Unconventional YCbCr signals are converted into conventional YCbCr letters
Number, then according to formula（1）Conventional YCbCr signals are converted into conventional rgb signal.
When the HDMI signals that the scheme that the present embodiment proposes is applied to terminal input are only desktop signals, HDMI letters can be omitted
The deterministic process of number type, the processing to HDMI signals is quicker, saves overhead, and can independently be selected by user
The tupe of HDMI signals, user experience are high.
In the present invention in the device preferred embodiment of HDMI signal transactings, the determining module 20 be additionally operable to if it is determined that
The signal processing model of terminal is automatic identification model where HDMI, it is determined that the type of the HDMI signals detected.
Under automatic identification model, the HDMI signals that detected can be identified for terminal, because desktop signals are focused on believing
Number reproducibility, then need not carry out picture quality enhancement processing to desktop signals, and vision signal then needs to strengthen display effect
Corresponding picture quality enhancement processing is carried out, HDMI signals are entered according to the type of the HDMI signals detected under adaptive model
Row is correspondingly handled so that the display effect of terminal-pair HDMI signals is more preferable, and in the present embodiment, can independently be selected by user
The tupe of HDMI signals is selected, user experience is high.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, every utilization
The equivalent structure transformation that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other related technology necks
Domain, it is included within the scope of the present invention.
Claims (10)
- A kind of 1. method to HDMI signal transactings, it is characterised in that including：The HDMI signals that detecting HDMI receives, it is determined that the type of the HDMI signals detected；When the HDMI signals detected are vision signal, and when not being conventional YCbCr signals, the HDMI signals detected are changed For conventional YCbCr signals；Image quality processing is carried out to the conventional YCbCr signals after conversion, and the conventional YCbCr signals after progress image quality processing are changed For conventional rgb signal and export；When the HDMI signals detected are desktop signals, and when being unconventional rgb signal, the HDMI signals detected are converted to Conventional rgb signal simultaneously exports；Wherein, the conventional YCbCr signals refer to the signal that YCbCr_16~235 are respectively adopted to encode, the unconventional YCbCr Signal refers to using YCbCr_0~255 signal that encodes, and the conventional rgb signal, which refers to, is respectively adopted the coding of RGB_0~255 Signal, the unconventional rgb signal refer to the signal encoded using RGB_16~235.
- 2. according to the method for claim 1, it is characterised in that it is described determine detect HDMI signals type the step of Also include afterwards：When the HDMI signals detected are desktop signals, and when being conventional rgb signal, the HDMI signals detected are directly exported.
- 3. according to the method for claim 1, it is characterised in that the HDMI signals that the detecting HDMI receives, really Surely also include after the step of type of the HDMI signals detected：When the HDMI signals detected are vision signal, and when being conventional YCbCr signals, picture is carried out to the HDMI signals detected Matter processing, and the conventional YCbCr signals after progress image quality processing are converted into conventional rgb signal and exported.
- 4. according to the method for claim 1, it is characterised in that described that the HDMI signals detected are converted into routine The step of YCbCr signals, includes：If the HDMI signals detected are conventional rgb signal, conventional rgb signal is converted into conventional YCbCr signals；Image quality processing is carried out to the conventional YCbCr signals after conversion, and the conventional YCbCr signals after progress image quality processing are changed For conventional rgb signal and export.
- 5. according to the method for claim 1, it is characterised in that described that the HDMI signals detected are converted into routine The step of YCbCr signals, also includes：If the HDMI signals are unconventional rgb signal, the HDMI signals are converted into conventional rgb signal；Conventional rgb signal is converted into conventional YCbCr signals；Image quality processing is carried out to the conventional YCbCr signals after conversion, and the conventional YCbCr signals after progress image quality processing are changed For conventional rgb signal and export.
- 6. according to the method for claim 1, it is characterised in that described that the HDMI signals detected are converted into routine The step of YCbCr signals, also includes：If the HDMI signals detected are not rgb signals, the HDMI signals detected are converted into conventional YCbCr signals；Image quality processing is carried out to the conventional YCbCr signals after conversion, and the conventional YCbCr signals after progress image quality processing are changed For conventional rgb signal and export.
- 7. according to the method for claim 1, it is characterised in that the step for the HDMI signals that the detecting HDMI receives After rapid, this method also includes：The signal processing model of terminal where determining HDMI；If it is determined that the signal processing model of terminal where HDMI is video mode, then judge whether is the HDMI signals that detect For conventional YCbCr signals；When the HDMI signals detected are not conventional YCbCr signals, the HDMI signals detected are converted into conventional YCbCr and believed Number；Image quality processing is carried out to the conventional YCbCr signals after conversion, and the conventional YCbCr signals after progress image quality processing are changed For conventional rgb signal and export.
- 8. according to the method for claim 7, it is characterised in that the signal transacting mould for determining HDMI place terminal After the step of formula, this method also includes：If it is determined that the signal processing model of terminal where HDMI is desktop, then judge whether is the HDMI signals that receive For conventional rgb signal；When the HDMI signals detected are not conventional rgb signals, then the HDMI signals detected are converted into conventional rgb signal simultaneously Output；If the HDMI signals detected are conventional rgb signals, the HDMI signals received are directly exported.
- 9. according to the method for claim 7, it is characterised in that the signal transacting mould for determining HDMI place terminal After the step of formula, this method also includes：If it is determined that the signal processing model of terminal is automatic identification model where HDMI, it is determined that the HDMI signals detected Type.
- A kind of 10. device to HDMI signal transactings, it is characterised in that including：Detecting module, the HDMI signals received for detecting HDMI；Determining module, for the type for the HDMI signals for determining to detect；Modular converter, for being vision signal when the HDMI signals that detect, and when not being conventional YCbCr signals, it will detect HDMI signals be converted to conventional YCbCr signals；Processing module, for carrying out image quality processing to the conventional YCbCr signals after conversion；The modular converter is additionally operable to the conventional YCbCr signals after progress image quality processing being converted to conventional rgb signal；Output module, for exporting the conventional rgb signal after changing；The modular converter, it is additionally operable to when the HDMI signals that detect are desktop signals, and when being unconventional rgb signal, will detects The HDMI signals measured are converted to conventional rgb signal；Wherein, the conventional YCbCr signals refer to the signal that YCbCr_16~235 are respectively adopted to encode, the unconventional YCbCr Signal refers to using YCbCr_0~255 signal that encodes, and the conventional rgb signal, which refers to, is respectively adopted the coding of RGB_0~255 Signal, the unconventional rgb signal refer to the signal encoded using RGB_16~235.
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| CN107645644B (en) * | 2016-07-22 | 2020-09-04 | 联发科技股份有限公司 | Receiving circuit of high-definition multimedia interface and method for determining transmission mode |
| TWI795410B (en) * | 2018-06-08 | 2023-03-11 | 圓剛科技股份有限公司 | Hdmi image processing system and method of color space quantization correction |
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