CN105336290A - Gamma correction method and device - Google Patents
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Abstract
The invention provides a gamma correction method and device. The method comprises the following steps: determining a photoelectric conversion curve corresponding to an input signal; determining a gamma correction curve according to the photoelectric conversion curve corresponding to the input signal, a preset gamma curve of a display and a gamma curve of a system; and correcting the gamma curve of the display by utilizing the gamma correction curve to display the input signal on the display according to the corrected gamma curve of the display. According to the method, the correction result is relatively accurate for different input signals, so that a relatively good visual display effect can be obtained.
Description
Technical field
The present invention relates to display technology field, particularly relate to a kind of gamma Gamma bearing calibration and device.
Background technology
Along with the development of display technique, image acquisition, display are just from standard dynamic range (StandardDynamicRange is called for short SDR) to high dynamic range (HighDynamicRange is called for short HDR) development.High dynamic range images can reproduce natural scene well, retains the detailed information in scene, brings visual experience true to nature.If the picture signal that input is directly come in by display is without showing in conversion, its display effect is often not in full conformity with the visual characteristic requirement of human eye, many detail of information cannot be readily perceptible by the human eye out, therefore display needs through gamma correction, just can reach the vision display effect required for human eye.The system gamma curve finally obtained is obtained by opto-electronic conversion curve corresponding to input signal, gamma correction curve, display gamma curve three partial stack, the opto-electronic conversion curve that wherein input signal is corresponding cannot adjust as received image signal, display gamma curve is also fixing for a certain specific display, therefore by adjustment gamma correction curve, the vision display effect required for human eye can only be obtained.
Because HDR signal is different with the Gamma standard of SDR signal, opto-electronic conversion curve requirement corresponding to HDR signal is according to the Society of Motion Picture and Television Engineers (TheSocietyofMotionPictureandTelevisionEngineers, being called for short SMPTE) 2084 standards set, the opto-electronic conversion curve that SDR signal is corresponding then requires to set according to Gamma2.2, therefore corresponding two the different opto-electronic conversion curves of two kinds of signals, and in prior art, no matter input signal is HDR signal or SDR signal, all correct by means of only same gamma correction curve, may occur correcting the inaccurate problem of result, thus good vision display effect cannot be obtained.
Summary of the invention
The invention provides a kind of gamma Gamma bearing calibration and device, correct the inaccurate problem of result to overcome in prior art.
First aspect, the invention provides a kind of gamma Gamma bearing calibration, comprising:
Determine the opto-electronic conversion curve that input signal is corresponding;
Opto-electronic conversion curve, default display gamma curve and the system gamma curve determination gamma correction curve corresponding according to input signal;
Utilize described gamma correction curve to correct display gamma curve, according to the display gamma curve after correction, described input signal is shown to make display.
Second aspect, the invention provides a kind of gamma Gamma means for correcting, comprising:
First processing module, for determining the opto-electronic conversion curve that input signal is corresponding;
Second processing module, for opto-electronic conversion curve, default display gamma curve and the system gamma curve determination gamma correction curve corresponding according to input signal;
Correction module, for utilizing described gamma correction curve to carry out Gamma correction, shows described input signal according to the display gamma curve after correction to make display.
Gamma Gamma of the present invention bearing calibration and device, by determining the opto-electronic conversion curve that input signal is corresponding, and according to opto-electronic conversion curve, the display gamma curve preset and system gamma curve determination gamma correction curve, thus utilize this gamma correction curve to carry out Gamma correction to display gamma curve, described input signal is shown according to the display gamma curve after correction to make display, compared to existing technologies, can according to different input signals, determine different gamma correction curves, and then utilize this gamma correction curve to carry out Gamma correction to display gamma curve, avoid in prior art, no matter input signal is HDR signal or SDR signal, all correct by means of only same gamma correction curve, may occur correcting the inaccurate problem of result, therefore, correction result of the present invention is comparatively accurate, thus good vision display effect can be obtained.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of Gamma bearing calibration one embodiment of the present invention;
Fig. 2 is the opto-electronic conversion curve synoptic diagram one of Gamma bearing calibration one embodiment of the present invention;
Fig. 3 is the opto-electronic conversion curve synoptic diagram two of Gamma bearing calibration one embodiment of the present invention;
Fig. 4 is the display Gamma2.2 curve synoptic diagram of Gamma bearing calibration one embodiment of the present invention;
Fig. 5 A is the SMPTE2084 typical curve schematic diagram of Gamma bearing calibration one embodiment of the present invention;
Fig. 5 B is the schematic diagram after the SMPTE2084 typical curve adjustment of Gamma bearing calibration one embodiment of the present invention;
Fig. 5 C is the Gamma1/2.2 curve synoptic diagram of Gamma bearing calibration one embodiment of the present invention;
Fig. 6 is the gamma correction curve schematic diagram of Gamma bearing calibration one embodiment of the present invention;
Fig. 7 is the schematic flow sheet of another embodiment of Gamma bearing calibration of the present invention;
Fig. 8 A is the structural representation of Gamma means for correcting one embodiment of the present invention;
Fig. 8 B is the structural representation of inventive display one embodiment.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The Gamma bearing calibration of the embodiment of the present invention can be applied in display, and the image mainly for display display carries out Gamma correction, is described in specific embodiment for SDR signal and HDR signal as Received signal strength.
With embodiment particularly, technical scheme of the present invention is described in detail below.These specific embodiments can be combined with each other below, may repeat no more for same or analogous concept or process in some embodiment.
Fig. 1 is the schematic flow sheet of Gamma bearing calibration one embodiment of the present invention.As shown in Figure 1, the method for the present embodiment, comprising:
Step 101, determine the opto-electronic conversion curve that input signal is corresponding;
Step 102, according to the corresponding opto-electronic conversion curve of input signal, default display gamma curve and system gamma curve determination gamma correction curve;
Step 103, utilize gamma correction curve to carry out Gamma correction to display gamma curve, according to the display gamma curve after correcting, described input signal is shown to make display.
Specifically, because traditional Gamma correction is all correct the Gamma2.2 curve of display, therefore, when HDR signal inputs, because HDR signal adopts OETFSMPTE2084 to carry out opto-electronic conversion, if its magnitude of voltage exported still corrects according to unified gamma correction curve, the parsing of luminance part will be caused to go wrong, the luminance part of more than the 100nit in HDR signal is all lost, therefore in the present invention, adopts gamma correction curve corresponding HDR signal and the SDR signal respectively that two different.
First determine the photoelectric curve that input signal is corresponding, if input signal is SDR signal, then corresponding opto-electronic conversion curve is OETFGamma2.2 curve, if input signal is HDR signal, then corresponding opto-electronic conversion curve is OETFSMPTE2084 typical curve.
System gamma curve is obtained by opto-electronic conversion curve corresponding to input signal, gamma correction curve, display gamma curve three partial stack, the opto-electronic conversion curve that wherein input signal is corresponding cannot adjust as received image signal, display gamma curve is also fixing for a certain specific display, therefore by adjustment gamma correction curve, the vision display effect required for human eye can only be obtained.
Therefore, opto-electronic conversion curve, default display gamma curve and the system gamma curve determination gamma correction curve corresponding according to input signal, such as, the photoelectric curve that input signal is corresponding is OETFGamma2.2, display gamma curve is also Gamma2.2 curve, the system gamma curve that final hope obtains is Gamma2.4 curve, then gamma correction curve is Gamma2.4/2.2 curve.
Fig. 2 is the opto-electronic conversion curve synoptic diagram one of Gamma bearing calibration one embodiment of the present invention.Curve shown in Fig. 2 is the opto-electronic conversion curve that input signal adopts OETFGamma2.2 standard corresponding, its horizontal ordinate representative input brightness range, and ordinate represents output voltage range, and in Fig. 2, transverse and longitudinal coordinate all represents with number percent; For horizontal ordinate, the input brightness range of corresponding 0-100 nit (nit), 100nit is that high-high brightness value when being taken by video camera determines, the bit wide that ordinate is usually corresponding is 8bit (0-255).
Fig. 3 is the opto-electronic conversion curve synoptic diagram two of Gamma bearing calibration one embodiment of the present invention.Curve shown in Fig. 3 is the opto-electronic conversion curve that input signal adopts OETFSMPTE2084 standard corresponding, its horizontal ordinate representative input brightness range, and ordinate represents output voltage range, and in Fig. 3, transverse and longitudinal coordinate all represents with number percent; For horizontal ordinate, the input brightness range of corresponding 0-10000nit, 10000nit is the high-high brightness that human eye can be differentiated; The bit wide that ordinate is corresponding is 10bit (0-1023).
In above-mentioned two curves, for horizontal ordinate, the bit wide that different chips is corresponding is different, may be 10bit, 12bit.
Fig. 4 is the display Gamma2.2 curve synoptic diagram of Gamma bearing calibration one embodiment of the present invention.As shown in Figure 4, this curve is Gamma2.2 curve, its horizontal ordinate represents input voltage range, ordinate represents output brightness scope, in Fig. 4, transverse and longitudinal coordinate all represents with number percent, for horizontal ordinate, the bit wide that major part chip is usually corresponding is 8bit (0-255), for ordinate, the bit wide that different displays is corresponding is different, may be 10bit, 12bit, carry out the output brightness scope of corresponding 0-100 nit (nit), 100nit be determined by the high-high brightness value of video camera when taking.
For SDR signal, if we finally wish that the system Gamma obtained is Gamma2.2, because SDR signal carries out voltage output according to OETFGamma2.2, if when display Gamma is 2.2, only need gamma correction curve to be set to the straight line that slope is 1, due to this kind of relatively simple, after do not repeating.
Fig. 5 A is the SMPTE2084 typical curve schematic diagram of Gamma bearing calibration one embodiment of the present invention.As shown in Figure 5A, this curve is SMPTE2084 typical curve, its horizontal ordinate represents input voltage range bit wide 10bit (0-1023) (bit wide Fig. 5 A shown in be 10bit), the 12bit (0-4095) different and corresponding different according to chip, ordinate represents output brightness scope, the bit wide that different chips is corresponding is different, may be 10bit, 12bit, carry out the output brightness scope of corresponding 0-10000nit, 10000nit is the high-high brightness 1 that human eye can be differentiated; In Fig. 5 A, transverse and longitudinal coordinate all represents with number percent, and horizontal ordinate corresponding when output brightness is 1000nit is 0.75, and ordinate is 0.1.
Fig. 5 B is the schematic diagram after the SMPTE2084 typical curve adjustment of Gamma bearing calibration one embodiment of the present invention.For the HDR signal carrying out opto-electronic conversion according to SMPTE2084 standard, if display is wanted to show according to SMPTE2084 standard, take input voltage range as 0-1023 (bit wide 10bit), output brightness scope is 0-10000nit (the bit wide 12bit of output brightness scope) is example, the maximum namely 1000nit of peak brightness due to our liquid crystal display, therefore we need to carry out corresponding curve adjustment according to the high-high brightness of display, namely intercept a part for SMPTE2084 typical curve; Intercepting input voltage range is 0-767, and output brightness scope is 0-1000nit (exporting bit wide exists different according to chip differences); And the part (corresponding input voltage range is 767-1023) between 1000nit-10000nit is saturated state, linear state, as shown in Figure 5 B.
Fig. 5 C is the Gamma1/2.2 curve synoptic diagram of Gamma bearing calibration one embodiment of the present invention.Fig. 6 is the gamma correction curve schematic diagram of Gamma bearing calibration one embodiment of the present invention.For HDR signal, if we finally wish that the system gamma curve obtained is SMPTE2084, because HDR signal carries out voltage output according to OETFSMPTE2084, if when display Gamma is 2.2, first we need a Gamma1/2.2, as shown in Figure 5 C, in Fig. 5 C, input voltage range is 0-255 (bit wide 8bit).The opto-electronic conversion curve of HDR signal be OETFSMPTE2084 as shown in Figure 3, display gamma curve be Gamma2.2 curve as shown in Figure 4, the system gamma curve required be SMPTE2084 typical curve as shown in Figure 5 B, the curve shown in Fig. 6 after the superposition that final corresponding gamma correction curve is the curve shown in Gamma1/2.2 curve as shown in Figure 5 C and Fig. 5 B.
Because the bit wide of the transverse and longitudinal coordinate of the curve shown in Fig. 5 C and Fig. 5 B is inconsistent, need to change, the mode of concrete conversion refers to following embodiment.
In said process, curve as shown in Figure 5 C superposes with display Gamma2.2 curve, obtain Gamma1.0 curve, because we finally wish that the system gamma curve obtained is SMPTE2084 typical curve, so we just need to superpose the curve shown in Fig. 5 B again.Actual final system gamma curve is exactly the curve shown in Fig. 5 B, and gamma correction curve is exactly the curve shown in Fig. 6 obtained after Fig. 5 B and Fig. 5 C superposition, and its horizontal ordinate represents input voltage range, and ordinate represents output voltage range.The transverse and longitudinal coordinate of gamma correction curve is all magnitude of voltage.
The Gamma bearing calibration that the present embodiment provides, by determining the opto-electronic conversion curve that input signal is corresponding, and according to opto-electronic conversion curve, the display gamma curve preset and system gamma curve determination gamma correction curve, thus utilize this gamma correction curve to carry out Gamma correction to display gamma curve, described input signal is shown according to the display gamma curve after correction to make display, compared to existing technologies, can according to different input signals, determine different gamma correction curves, and then utilize this gamma correction curve to carry out Gamma correction to display gamma curve, avoid in prior art, no matter input signal is HDR signal or SDR signal, all correct by means of only same gamma correction curve, may occur correcting the inaccurate problem of result, therefore, correction result of the present invention is comparatively accurate, thus good vision display effect can be obtained.
Fig. 7 is the schematic flow sheet of another embodiment of Gamma bearing calibration of the present invention.As shown in Figure 7, on the basis of the embodiment shown in Fig. 1, further, in actual applications, determine the opto-electronic conversion curve that input signal is corresponding and determine that the embodiment of gamma correction curve can have multiple, optionally, as the enforceable mode of one, the method of the present embodiment, comprising:
Whether step 1011, basis get the metadata of input signal, determine the signal type of input signal;
Step 1012, the opto-electronic conversion curve corresponding according to signal type determination input signal;
Step 1021, parameter according to the parameter determination gamma correction curve of the corresponding output parameter of opto-electronic conversion curve, the parameter of default display gamma curve and the system gamma curve of input signal;
Step 1022, the bit wide corresponding according to the output voltage values scope of the first bit wide determination gamma correction curve corresponding to the input voltage value scope of display gamma curve;
Step 1023, the bit wide corresponding according to the input voltage value scope of the second bit wide determination gamma correction curve corresponding to the output voltage values scope of opto-electronic conversion corresponding to input signal;
Step 1024, the bit wide determination gamma correction curve corresponding according to the output voltage values scope of bit wide corresponding to the input voltage value scope of the parameter of gamma correction curve, gamma correction curve and gamma correction curve;
Step 103, utilize gamma correction curve to carry out Gamma correction to display gamma curve, according to the display gamma curve after correcting, described input signal is shown to make display.
Wherein, in actual applications, signal type can comprise: standard dynamic range SDR signal or high dynamic range HDR signal.
Specifically, because HDR signal comprises metadata, i.e. the Static expansion information of signal of video signal, as monochrome information, chrominance information etc., therefore whether basis gets the metadata of input signal, determines the signal type of input signal; If comprise metadata, input signal is HDR signal, otherwise is SDR signal; Further according to the signal type determination opto-electronic conversion curve determined; If input signal is HDR signal, then opto-electronic conversion curve is OETFSMPTE2084 typical curve; If input signal is SDR signal, then opto-electronic conversion curve is OETFGamma2.2 curve.
Wherein, in actual applications, gamma correction curve is determined, first, need according to the parameter of the parameter determination gamma correction curve of the parameter of the output parameter of the opto-electronic conversion curve of input signal, default display gamma curve and system gamma curve.
In actual applications, the parameter of system gamma curve can be obtained according to the output parameter of the opto-electronic conversion curve of input signal, the default parameter of display gamma curve and the parameter product of gamma correction curve.
Such as, the opto-electronic conversion curve of input signal is OETFGamma2.2 curve, and display gamma curve is also Gamma2.2 curve, finally wishes that the system gamma curve that obtains also is Gamma2.2 curve, then gamma correction curve to be slope be 1.0 straight line.
Further, the bit wide corresponding according to the output voltage values scope of the first bit wide determination gamma correction curve corresponding to the input voltage value scope of display gamma curve, namely the bit wide that the output voltage values scope of gamma correction curve is corresponding is that the first bit wide corresponding with the input voltage value scope of display gamma curve is consistent, first bit wide corresponding to the input voltage value scope as display gamma curve is 8bit, then the bit wide that the output voltage values scope of gamma correction curve is corresponding is also required to be 8bit.
Further, the bit wide corresponding according to the input voltage value scope of the second bit wide determination gamma correction curve corresponding to the output voltage values scope of the opto-electronic conversion curve of input signal, namely the bit wide that the input voltage value scope of gamma correction curve is corresponding is that the second bit wide corresponding with the output voltage values scope of the opto-electronic conversion curve of input signal is consistent, second bit wide corresponding to the output voltage values scope as the opto-electronic conversion curve of input signal is 10bit, then the bit wide of the input voltage value scope of gamma correction curve also must be 10bit.
Then, corresponding according to the input voltage value scope of bit wide corresponding to the input voltage value scope of the parameter of gamma correction curve, gamma correction curve and gamma correction curve bit wide determination gamma correction curve.
If opto-electronic conversion curve is OETFSMPTE2084 typical curve, display gamma curve is Gamma2.2 curve, finally wishes that the system gamma curve obtained is SMPTE2084, then gamma correction curve is for shown in the curve map 6 after Fig. 5 B and Fig. 5 C superposition.
It should be noted that, above-mentioned steps 1022, step 1023 be order in no particular order.
In above-mentioned embodiment, the metadata of input signal whether is got by basis, thus determine the opto-electronic conversion curve that input signal is corresponding, and according to the parameter of opto-electronic conversion curve, the parameter of display gamma curve preset and the parameter determination gamma correction curve of system gamma curve, then corresponding according to the bit wide determination gamma correction curve of the output voltage values of the input voltage value scope of display gamma curve and opto-electronic conversion curve corresponding to input signal bit wide, thus determine gamma correction curve, and utilize this gamma correction curve to carry out Gamma correction, compared to existing technologies, can according to different input signals, determine different gamma correction curves, avoid in prior art, no matter input signal is HDR signal or SDR signal, all correct by means of only same gamma correction curve, may occur correcting the inaccurate problem of result, therefore, correction result of the present invention is comparatively accurate, thus good vision display effect can be obtained.
On the basis of above-mentioned embodiment, further, the bit wide corresponding due to the output voltage of the opto-electronic conversion curve of input signal may be different from the bit wide of the input voltage of display gamma curve, therefore at certainty annuity gamma curve and timing, the skimble-scamble problem of bit wide of input voltage range will be related to.Therefore, in order to avoid the problems referred to above, in the present embodiment, concrete, before step 102, namely before the opto-electronic conversion according to input signal, default display gamma curve and system gamma curve determination gamma correction curve, can proceed as follows:
The second corresponding for the output voltage values scope of the opto-electronic conversion curve of input signal bit wide is adjusted to first bit wide corresponding with the input voltage value scope of display gamma curve consistent.
Specifically, if input signal is HDR signal, then opto-electronic conversion curve is OETFSMPTE2084 typical curve, and display gamma curve is Gamma2.2 curve, and the first bit wide corresponding to the input voltage value scope of display gamma curve is 8bit, then the second corresponding for the output voltage values scope of OETFSMPTE2084 typical curve bit wide is also adjusted to 8bit.
In actual applications, optionally, as the enforceable mode of one, the relation between the first bit wide that the second bit wide corresponding to the opto-electronic conversion curve output voltage values scope of input signal is corresponding with the input voltage value scope of display gamma curve meets following formula:
Gh＝Gl+[2^x–1]×(Gl-1)；
Wherein, if second is wider than the first bit wide, then Gh represents the representative value under the second bit wide that output voltage values is corresponding, and Gl represents the representative value under the first bit wide that input voltage value is corresponding, and x represents the difference of the second bit wide and the first bit wide;
If the second bit wide is less than the first bit wide, then Gh represents the representative value under the first bit wide that input voltage value is corresponding, and Gl represents the representative value under the second bit wide that output voltage values is corresponding, and x represents the difference of the first bit wide and the second bit wide.
Specifically, the first bit wide that the input voltage value scope of display gamma curve is corresponding is 8bit, and the second bit wide corresponding to the output voltage values scope of the opto-electronic conversion curve of input signal is 10bit, Gh represents the value that a certain output voltage values represents with 10bit, Gl represents the value that this input voltage value represents with 8bit, suppose that this output voltage values 10bit is expressed as 769, then this input voltage value 8bit is expressed as 193, when second bit wide corresponding to the output voltage values scope of the opto-electronic conversion curve of input signal is less than the first bit wide corresponding to the input voltage value scope of display gamma curve, similar with above-mentioned situation, repeat no more herein.
In above-mentioned embodiment, because bit wide corresponding to the transverse and longitudinal coordinate of gamma correction curve and the horizontal ordinate of display gamma curve and bit wide corresponding to the ordinate of opto-electronic conversion curve may be different, therefore gamma correction curve and timing is being determined, bit wide corresponding for the transverse and longitudinal coordinate of gamma correction curve is adjusted to the bit wide corresponding with the ordinate of the horizontal ordinate of display gamma curve and opto-electronic conversion curve consistent, thus avoids the skimble-scamble problem of bit wide.
Fig. 8 A is the structural representation of Gamma means for correcting one embodiment of the present invention.As shown in Figure 8 A, the Gamma means for correcting of the present embodiment, can comprise: the first processing module 701, second processing module 702 and correction module 703;
Wherein, the first processing module 701, for determining the opto-electronic conversion curve of input signal;
Second processing module 702, for the opto-electronic conversion curve according to input signal, default display gamma curve and system gamma curve determination gamma correction curve;
Correction module 703, for utilizing gamma correction curve to carry out Gamma correction, shows described input signal according to the display gamma curve after correction to make display.
On the basis of above-mentioned embodiment, optionally, as the enforceable mode of one, the first processing module 701, specifically for:
According to the metadata whether getting input signal, determine the signal type of input signal;
The opto-electronic conversion curve corresponding according to signal type determination input signal.
Optionally, as the enforceable mode of one, signal type comprises: standard dynamic range SDR signal or high dynamic range HDR signal.
Optionally, as the enforceable mode of one, the second processing module 702, specifically for:
According to the parameter of the parameter determination gamma correction curve of the output parameter of the opto-electronic conversion curve of input signal, the parameter of default display gamma curve and system gamma curve;
The bit wide corresponding according to the output voltage values scope of the first bit wide determination gamma correction curve corresponding to the input voltage value scope of display gamma curve;
The bit wide corresponding according to the input voltage value scope of the second bit wide determination gamma correction curve corresponding to the output voltage values scope of input signal photoelectricity transformation curve;
The bit wide corresponding according to the input voltage value scope of the parameter of gamma correction curve, gamma correction curve and bit wide determination gamma correction curve corresponding to the output voltage values scope of gamma correction curve.
Optionally, as the enforceable mode of one, the second processing module 702, specifically for:
The parameter of system gamma curve is obtained according to the product of the output parameter of the opto-electronic conversion curve of input signal, the default parameter of display gamma curve and the parameter of gamma correction curve.
Optionally, as the enforceable mode of one, the second processing module 702, also for:
The second corresponding for the output voltage values scope of opto-electronic conversion curve corresponding for input signal bit wide is adjusted to first bit wide corresponding with the input voltage value scope of display gamma curve consistent.
Optionally, as the enforceable mode of one, the relation between the first bit wide that the second bit wide corresponding to the output voltage values scope of the opto-electronic conversion curve that input signal is corresponding is corresponding with the input voltage value scope of display gamma curve meets following formula:
Gh＝Gl+[2^x–1]×(Gl-1)；
Wherein, if second is wider than the first bit wide, then Gh represents the representative value under the second bit wide that output voltage values is corresponding, and Gl represents the representative value under the first bit wide that input voltage value is corresponding, and x represents the difference stating the second bit wide and the first bit wide;
If the second bit wide is less than the first bit wide, then Gh represents the representative value under the first bit wide that input voltage value is corresponding, and Gl represents the representative value under the second bit wide that output voltage values is corresponding, and x represents the difference of the first bit wide and the second bit wide.
It should be noted that, for device embodiment, because it is substantially corresponding to embodiment of the method, so relevant part illustrates see the part of embodiment of the method.
Fig. 8 B is the structural representation of inventive display one embodiment.As shown in Figure 8 B, the display of the present embodiment, can comprise: processor 801, storer 802 and communication interface 803;
Wherein, storer 802, for storage program; Particularly, program can comprise program code, and described program code comprises computer-managed instruction.Storer 802 may comprise random access memory (randomaccessmemory is called for short RAM), still may comprise nonvolatile memory (non-volatilememory), such as at least one magnetic disk memory.
Communication interface 803, for receiving input signal;
Processor 801, for the program that execute store 802 stores, for perform the present invention as shown in Fig. 1-Fig. 7 embodiment of the method the technical scheme that provides, it realizes principle and technique effect is similar, with reference to the embodiment of the method shown in figure 1, can repeat no more herein.
The function of above-mentioned first processing module 701, second processing module 702 and correction module 703 can be realized by processor.
The display of the present embodiment can also comprise display screen.
Processor by integrated circuit (IntegratedCircuit is called for short IC) composition, such as, can be made up of the IC of single encapsulation, also can be made up of the encapsulation IC connecting many identical functions or difference in functionality.For example, processor can be central processing unit (CentralProcessingUnit, be called for short CPU), also can be digital signal processor (DigitalSignalProcessor, be called for short DSP), special IC (ASIC), field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components.
Above-mentioned parts are communicated by one or more bus.It will be appreciated by those skilled in the art that, the structure of the embedded device shown in Fig. 8 B does not form limitation of the invention, it both can be busbar network, also can be hub-and-spoke configuration, the parts more more or less than diagram can also be comprised, or combine some parts, or different parts are arranged.
In several embodiments that the application provides, should be understood that disclosed equipment and method can realize by another way.Such as, apparatus embodiments described above is only schematic, such as, the division of described unit or module, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or module can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of equipment or module or communication connection can be electrical, machinery or other form.
The described module illustrated as separating component can or may not be physically separates, and the parts as module display can be or may not be physical module, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that programmed instruction is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (14)
1. a gamma Gamma bearing calibration, is characterized in that, comprising:
Determine the opto-electronic conversion curve that input signal is corresponding;
Opto-electronic conversion curve, default display gamma curve and the system gamma curve determination gamma correction curve corresponding according to described input signal;
Utilize described gamma correction curve to correct described display gamma curve, according to the display gamma curve after correction, described input signal is shown to make display.
2. method according to claim 1, is characterized in that, describedly determines the opto-electronic conversion curve that input signal is corresponding, comprising:
According to the metadata whether getting described input signal, determine the signal type of described input signal;
The opto-electronic conversion curve that described input signal is corresponding is determined according to described signal type.
3. method according to claim 2, is characterized in that, described signal type comprises: standard dynamic range SDR signal or high dynamic range HDR signal.
4. the method according to any one of claim 1-3, is characterized in that, the described opto-electronic conversion curve corresponding according to input signal, default display gamma curve and system gamma curve determination gamma correction curve, comprising:
The parameter of described gamma correction curve is determined according to the output parameter of opto-electronic conversion curve corresponding to described input signal, the parameter of described default display gamma curve and the parameter of described system gamma curve;
First bit wide corresponding according to the input voltage value scope of described display gamma curve determines the bit wide that the output voltage values scope of described gamma correction curve is corresponding;
Second bit wide corresponding according to the output voltage values scope of opto-electronic conversion curve corresponding to described input signal determines the bit wide that the input voltage value scope of described gamma correction curve is corresponding;
The bit wide corresponding according to the input voltage value scope of the parameter of described gamma correction curve, described gamma correction curve and bit wide corresponding to the output voltage values scope of described gamma correction curve determine described gamma correction curve.
5. method according to claim 4, it is characterized in that, the output parameter of the described opto-electronic conversion curve corresponding according to described input signal, the parameter of described default display gamma curve and the parameter of described system gamma curve determine the parameter of described gamma correction curve, comprising:
The parameter of described system gamma curve is obtained according to the output parameter of opto-electronic conversion curve corresponding to described input signal, the described parameter of default display gamma curve and the parameter product of described gamma correction curve.
6. method according to claim 4, is characterized in that, before the described opto-electronic conversion curve corresponding according to input signal, default display gamma curve and described system gamma curve determination gamma correction curve, also comprises:
The second corresponding for the output voltage values scope of opto-electronic conversion curve corresponding for described input signal bit wide is adjusted to first bit wide corresponding with the input voltage value scope of described display gamma curve consistent.
7. method according to claim 6, it is characterized in that, the relation between the first bit wide that the second bit wide corresponding to the output voltage values scope of the opto-electronic conversion curve that described input signal is corresponding is corresponding with the input voltage value scope of described display gamma curve meets following formula:
Gh＝Gl+[2^x–1]×(Gl-1)；
Wherein, if described second is wider than described first bit wide, then Gh represents the representative value under the second bit wide that output voltage values is corresponding, and Gl represents the representative value under the first bit wide that input voltage value is corresponding, and x represents the difference of described second bit wide and described first bit wide;
If described second bit wide is less than described first bit wide, then Gh represents the representative value under the first bit wide that input voltage value is corresponding, and Gl represents the representative value under the second bit wide that output voltage values is corresponding, and x represents the difference of described first bit wide and described second bit wide.
8. a gamma Gamma means for correcting, is characterized in that, comprising:
First processing module, for determining the opto-electronic conversion curve that input signal is corresponding;
Second processing module, for opto-electronic conversion curve, default display gamma curve and the system gamma curve determination gamma correction curve corresponding according to input signal;
Correction module, for utilizing described gamma correction curve to correct display gamma curve, shows described input signal according to the display gamma curve after correction to make display.
9. device according to claim 8, is characterized in that, described first processing module, specifically for:
According to the metadata whether getting described input signal, determine the signal type of described input signal;
The opto-electronic conversion curve that described input signal is corresponding is determined according to described signal type.
10. device according to claim 9, is characterized in that, described signal type comprises: standard dynamic range SDR signal or high dynamic range HDR signal.
11. devices according to Claim 8 described in-10 any one, is characterized in that, described second processing module, specifically for:
The parameter of described gamma correction curve is determined according to the output parameter of the opto-electronic conversion curve of described input signal, the parameter of described default display gamma curve and the parameter of described system gamma curve;
First bit wide corresponding according to the input voltage value scope of described display gamma curve determines the bit wide that the output voltage values scope of described gamma correction curve is corresponding;
Second bit wide corresponding according to the output voltage values scope of opto-electronic conversion curve corresponding to described input signal determines the bit wide that the input voltage value scope of described gamma correction curve is corresponding;
The bit wide corresponding according to the input voltage value scope of the parameter of described gamma correction curve, described gamma correction curve and bit wide corresponding to the output voltage values scope of described gamma correction curve determine described gamma correction curve.
12. devices according to claim 11, is characterized in that, described second processing module, specifically for:
The parameter of described system gamma curve is obtained according to the product of the output parameter of the opto-electronic conversion curve of described input signal, the described parameter of default display gamma curve and the parameter of described gamma correction curve.
13. devices according to claim 11, is characterized in that, described second processing module, also for:
The second corresponding for the output voltage values scope of opto-electronic conversion corresponding for described input signal bit wide is adjusted to first bit wide corresponding with the input voltage value scope of described display gamma curve consistent.
14. devices according to claim 13, it is characterized in that, the relation between the first bit wide that the second bit wide corresponding to the output voltage values scope of the opto-electronic conversion curve of described input signal is corresponding with the input voltage value scope of described display gamma curve meets following formula:
Gh＝Gl+[2^x–1]×(Gl-1)；
Wherein, if described second is wider than described first bit wide, then Gh represents the representative value under the second bit wide that output voltage values is corresponding, and Gl represents the representative value under the first bit wide that input voltage value is corresponding, and x represents the difference of described second bit wide and described first bit wide;
If described second bit wide is less than described first bit wide, then Gh represents the representative value under the first bit wide that input voltage value is corresponding, and Gl represents the representative value under the second bit wide that output voltage values is corresponding, and x represents the difference of described first bit wide and described second bit wide.
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