CN1874527A - Gamma correction unit, and method and equipment for implementing gamma correction - Google Patents
Gamma correction unit, and method and equipment for implementing gamma correction Download PDFInfo
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Abstract
The method thereof comprises: a) the gamma curve is divided into several straight segments; the length of each straight segment = 2k; b) saving the gamma parameters generated by dividing gamma curve, and said gamma parameters includes the initial point input value x1, the ending point input value y1 and output value y2, and k value of each straight segment; c) using the input value x of the image to be corrected and the saved gamma parameters to make correction calculation; in the correction calculation, shifting k bit to right direction to implement the division for each straight segment input interval space in order to calculate the output value y of the image to be outputted so as to make gamma correction.
Description
Technical field
The present invention relates to Digital Signal Processing, especially the method and apparatus that gamma correcting device and realization gal sign indicating number (Gamma) are proofreaied and correct in the digital signal processing.
Background technology
A same width of cloth digital image shows on different displays, may obtain different results.Main cause is, different types of display, its principle of luminosity is different, when the voltage signal with each pixel converts luminance signal to, its the two corresponding relation is not a kind of relation of linearity, therefore may cause coarse image color reduction result.In order to address this problem, need carry out gamma correction to digital image signal at the physical characteristic of different image display units.Like this, deliver on the display device, just can correctly restore the original effect of image through corrected picture intelligence in advance.
In the process that gamma (Gamma) is proofreaied and correct, two kinds of implementation methods are generally arranged, the one, the table look-at method, another kind is a direct computing method.Look-up table is good the output calculated in advance of each possible input correspondence, and is made into a table and deposits.Like this, in work,, just can obtain exporting the result at once as long as in table, retrieve according to input value.Be characterized in as long as table keeps in advance, in work, need amount of calculation hardly, its shortcoming is that the hardware store amount is bigger, in addition if change a different Gamma coefficient or a difform gamma curve, then whole table need be refreshed usually, this realizes for hardware, is very big expense.
Direct computing method is whole gamma curve to be divided into some straightways come approximate representation, writes down the starting point of each section, the coordinate of terminating point respectively.As shown in Figure 1, the gamma curve that drawn among the figure, AB are 2 points on the curve, and corresponding input value is respectively x1 and x2, and corresponding output valve is respectively y1 and y2.Supposing to have now an input value is x, drops on the C point between the line segment AB, and then the output valve y that the C point is corresponding is:
y＝y1+(((y2-y1)*(x-x1))/(x2-x1)) (1)
Like this, corresponding to certain input value,, just can obtain its corresponding output valve then with straight line equation as long as calculate it on which straightway.Its advantage is that the hardware store amount is less, and more flexible when making amendment, and only need change that seldom Several Parameters is just passable; Shortcoming is that amount of calculation is bigger, especially when hardware is realized, needs to realize a divider.Generally speaking for one the 8 variable divisor (denominator) of bit, this divider needs to want the circuit of several thousand gates to realize at least, complexity is higher, and all will carry out the calculating of divider to each pixel, and so the power consumption brought of Duo logic gates is bigger.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of gamma correcting device and realizes method of gamma correction and device, to reduce hard-wired complexity greatly.
For solving the problems of the technologies described above, the invention provides a kind of realization method of gamma correction, this method may further comprise the steps:
(a) gamma curve is divided into several straightways, the length of the input interval of each straightway is 2 k power;
(b) the gamma parameter that gamma curve produces is divided in storage, and described gamma parameter comprises the input value x1 of starting point of each straightway and input value y1, output valve y2 and the parameter k value of terminating point;
(c) utilize the gamma parameter of image input value x to be corrected and storage to carry out correction calculation, adopt the k position that moves to right to realize division in the correction calculation, realize gamma correction with the output valve y that calculates pending image to each straightway input interval.
Further, step (c) comprises the steps: to judge the straightway of this input value correspondence according to image input value x to be corrected.
Further, step (c) further comprises: the gamma parameter of obtaining this straightway according to judged result.
Further, step (c) utilize formula y=((x-x1) * (y2-y1＞＞k)+y1 carries out correction calculation.
Further, step (c) utilize formula y=((x-x1)＞＞k) * (y2-y1)+y1 carries out correction calculation.
For solving the problems of the technologies described above, the invention provides a kind of device of realizing gamma correction, this device comprises gamma parameter memory module, input picture memory module, gamma correction module and output image memory module, wherein:
The gamma parameter memory module is used to store the gamma parameter that segmentation is in advance produced to gamma curve, and the length of the input interval of each straightway is 2 k power; Described gamma parameter comprises input value, output valve, the input of terminating point, the output valve of each straightway starting point, and the k value of each straightway;
The gamma correction module utilizes input value to be corrected and gamma parameter to calculate, and utilizes the k position that moves to right to realize division to this straightway input interval exporting the correction value output that calculates to the output image memory cell.
Further, the gamma correction module also comprises judging unit, query unit and computing unit, wherein:
Judging unit is used to judge the straightway from the pairing gamma curve of input value to be corrected of input picture memory module;
Query unit is used to inquire about gamma parameter memory module database, and obtains the gamma parameter of input value to be corrected institute line correspondence section and be transferred to computing unit;
Computing unit utilizes input value to be corrected and the gamma parameter that obtained to calculate, and utilizes the k position that moves to right to realize division to this straightway input interval exporting the correction value output that calculates to the output image memory cell.
Further, computing unit by first subtract that logical block, second subtracts logical block, takes advantage of logical block, the logical block that moves to right and add logical block and constitute, wherein the input/output relation of each logical block is as follows:
Input value to be corrected is the input value of this computing unit;
Input value to be corrected and this straightway starting point input value are respectively first first, second input value that subtracts logical block;
The output valve of the terminating point output valve of this straightway and the starting point of this straightway is respectively second first, second input value that subtracts logical block;
First output valve and second output valve that subtracts logical block that subtracts logical block is respectively first, second input value of taking advantage of logical block;
Take advantage of the k value of the output valve of logical block and this straightway to be respectively first, second input value of the logical block that moves to right;
The logical block that moves to right output valve and the output valve of the starting point of this straightway be respectively first, second output valve that adds logical block;
The output valve that adds logical block is the output valve of this computing unit.
Further, the formula finished of computing unit is: y=((x-x1) * (y2-y1)＞＞k)+y1 or y=((x-x1)＞＞k) * (y2-y1)+y1.
For solving the problems of the technologies described above, the present invention also provides a kind of device of gamma correction, and this device comprises gamma parameter memory module and gamma correction module, wherein:
The gamma parameter memory module is used to store the gamma parameter that segmentation is in advance produced to gamma curve, and the length of the input interval of each straightway is 2 k power; Described gamma parameter comprises input value, output valve, the input of terminating point, the output valve of each straightway starting point, and the k value of each straightway;
The gamma correction module utilizes input value to be corrected and gamma parameter to calculate, and utilizes the k position that moves to right to realize division to this straightway input interval exporting the correction value output that calculates to the output image memory cell.
In the inventive method, in the length with the input interval of each straightway is that the principle of 2 k power time is carried out under the prerequisite of segmentation to gamma curve, complicated division calculation is realized in the employing k position that moves to right, same, the hardware that also adopts the k position that moves to right to carry out gamma correction in the device of realizing gamma correction and gamma correcting device is realized, simplify the complexity of gamma correction, promoted the efficient of gamma correction.
Description of drawings
Fig. 1 is the correction calculation schematic diagram of prior art gamma curve.
Fig. 2 is the logical circuit schematic diagram that the existing techniques in realizing gamma correction calculates.
Fig. 3 is that the present invention realizes gamma correcting device.
Fig. 4 is the logical circuit schematic diagram that the present invention realizes the embodiment that gamma correction calculates.
Fig. 5 is the logical circuit schematic diagram that the present invention realizes another embodiment that gamma correction calculates.
Embodiment
It is that the principle of 2 k power time is carried out segmentation to gamma curve that the present invention mainly adopts length with the input interval of each straightway, adopts the k position that moves to right to realize division to each straightway input interval in the correction calculation, thereby simplifies the hardware configuration of gamma correction.
The implementation method of gamma correction of the present invention may further comprise the steps:
Step 1: gamma curve is divided into several straightways, and the length of the input interval of each straightway is 2 k power;
Step 2: the gamma parameter that gamma curve produces is divided in storage, and the gamma parameter comprises input value x2, output valve y2 and the parameter k value of input value x1, output valve y1 and the terminating point of the starting point of each straightway;
Step 3: utilize the gamma parameter of image input value x to be corrected and storage to carry out correction calculation, adopt the k position that moves to right to realize division in the correction calculation, realize gamma correction with the output valve y that calculates pending image to each straightway input interval.
At first according to image input value x to be corrected, judge the straightway of this input value correspondence for realizing above-mentioned steps; Obtain the gamma parameter of this straightway then according to judged result, utilize again formula y=((x-x1) * (y2-y1)＞＞k)+y1 or formula y=((x-x1)＞＞k) * (y2-y1)+y1 carries out correction calculation.
"＞＞" expression right-shift operation wherein, "＞＞k " expression k position that moves to right.
As shown in Figure 3, the implement device of gamma correction of the present invention comprises gamma parameter memory module, input picture memory module, gamma correction module and output image memory module.Wherein:
The gamma parameter memory module is used to store to the gamma curve parameter that straight segments produced in advance, and the gamma parameter comprises input value, the input of terminating point, the output valve of each straightway starting point, and the k value of each straightway.
The segmentation principle of gamma curve is, the length of the input interval of each straightway is 2 k power, wherein k is an integer, the input interval length of each straightway can equate, k parameter value such as all straightways all is 8, and the input interval of each straightway also can be unequal, such as, the k parameter value of the straightway that has is 8, and the k parameter value of the straightway that has is 16 etc.
The input picture memory module is used for the input value of memory image and imports input value to be corrected to the gamma correction module.
The output image memory module is used to store the output valve after the gamma correction module is proofreaied and correct, and exports other image processing modules to.
The gamma correction module is used for judging according to the image input value of input, obtain and utilize the gamma parameter to carry out gamma correction to obtain calculating the output image output valve importing input value to be corrected, the gamma correction module also comprises judging unit, query unit and computing unit, wherein:
Judging unit is used to judge the straightway from the pairing gamma curve of input value to be corrected of input picture memory module;
Query unit is used to inquire about gamma parameter memory module database, and obtains the gamma parameter of input value to be corrected institute line correspondence section and be transferred to computing unit;
Computing unit utilizes input value to be corrected and the gamma parameter that obtained to calculate, and utilizes the k position that moves to right to realize division to this straightway input interval exporting the correction value output that calculates to the output image memory cell.
As shown in Figure 4, computing unit by first subtract that logical block 10, second subtracts logical block 20, takes advantage of logical block 30, the logical block that moves to right 40 and add logical block 50 and constitute, wherein the input/output relation of each logical block is as follows:
Input value x to be corrected is the input value of this computing unit;
Input value x to be corrected first subtracts first input value of logical block 10, and this straightway starting point input value x1 first subtracts second input value of logical block 10;
The terminating point output valve y2 of this straightway second subtracts first input value of logical block 20, and the output valve y1 of the starting point of this straightway second subtracts second input value of logical block 20;
First subtracts logical block 10 output valves (x-x1) for taking advantage of first input value of logical block 30, and second subtracts the output valve (y2-y1) of logical block 30 for taking advantage of second input value of logical block 30;
Take advantage of first input value of the output valve ((x-x1) * (y2-y1)) of logical block 30 for the logical block 40 that moves to right, the k value of this straightway is second input value of the logical block 40 that moves to right;
The output valve of the logical block that moves to right 40 ((x-x1) * (y2-y1)＞＞k) for adding first input value of logical block 50, the output valve y1 of the starting point of this straightway is second output valve that adds logical block 50;
Add logical block output valve ((x-x1) * (y2-y1＞＞k)+y1 is the output valve y of this computing unit, promptly y=((x-x1) * (y2-y1)＞＞k)+y1.
For instance, if the input interval length of AB correspondence is 8 among the figure, then formula (1) just is reduced to formula (2), it needs to be noted, hardware is realized that right-shift operation is easy to realize that its complexity will reduce greatly than the division in the formula (1).
y＝((x-x1)*(y2-y1)＞＞3)+y1
In another embodiment, computing unit also can be realized by logical construction shown in Figure 5, this computing unit by first subtract logical block 10 ', the logical block 20 ' that moves to right, second subtracts logical block 30 ', take advantage of logical block 40 ' and add logical block 50 ' constitutes, wherein the input/output relation of each logical block is as follows:
Input value x to be corrected is the input value of this computing unit;
Input value x to be corrected first subtracts first input value of logical block 10 ', and this straightway starting point input value x1 first subtracts second input value of logical block 10 ';
First subtracts first input value of the output valve (x-x1) of logical block for the logical block 20 ' that moves to right, and the k value of this straightway is second input value of the logical block 20 ' that moves to right;
The terminating point output valve y2 of this straightway second subtracts first input value of logical block 30 ', and the output valve y1 of the starting point of this straightway second subtracts second input value of logical block 30 ';
The output valve of the logical block that moves to right 20 ((x-x1)＞＞k) for taking advantage of first input value of logical block 30 ', second subtracts the output valve (y2-y1) of logical block 30 for taking advantage of second input value of logical block 40 ';
Take advantage of the output valve (x-x1) of logical block 40＞＞k) * (y2-y1) is for adding first input value of logical block 50 ', the output valve y1 of the starting point of this straightway is for adding second output valve of logical block 50 ';
Add logical block output valve ((x-x1)＞＞k) * (y2-y1)+y1 is the output valve y of this computing unit, promptly y=((x-x1)＞＞k) * (y2-y1)+y1.
Certainly after the hardware configuration of aforementioned calculation unit also can carry out mathematic(al) manipulation to following formula again, realize with more complicated logical block and structure.
In sum, in the inventive method, with the length of the input interval of each straightway is that the principle of 2 k power time is carried out segmentation to gamma curve, make the hardware that carries out the gamma check and correction realize, adopt the logical block that relatively simply moves to right to replace complicated division logical block, as long as and the suitable figure place that moves to right is just passable.With respect to the division logical block, shift cells right needs the circuit of hundreds of door just can realize that complexity reduces greatly approximately, and the more original divider of the power consumption of this shift cells right also reduces greatly in addition.
Claims (10)
1, a kind of realization method of gamma correction, this method may further comprise the steps:
(a) gamma curve is divided into several straightways, the length of the input interval of each straightway is 2 k power;
(b) the gamma parameter that gamma curve produces is divided in storage, and described gamma parameter comprises the input value x1 of starting point of each straightway and input value y1, output valve y2 and the parameter k value of terminating point;
(c) utilize the gamma parameter of image input value x to be corrected and storage to carry out correction calculation, adopt the k position that moves to right to realize division in the correction calculation, realize gamma correction with the output valve y that calculates pending image to each straightway input interval.
2, the method for claim 1 is characterized in that: step (c) comprises the steps: to judge the straightway of this input value correspondence according to image input value x to be corrected.
3, method as claimed in claim 2 is characterized in that: step (c) further comprises: the gamma parameter of obtaining this straightway according to judged result.
4, as each described method in the claim 1 to 3, it is characterized in that: step (c) utilize formula y=((x-x1) * (y2-y1)＞＞k)+y1 carries out correction calculation.
5, as each described method in the claim 1 to 3, it is characterized in that: step (c) utilize formula y=((x-x1)＞＞k) * (y2-y1)+y1 carries out correction calculation.
6, a kind of device of realizing gamma correction, this device comprises gamma parameter memory module, input picture memory module, gamma correction module and output image memory module, it is characterized in that:
The gamma parameter memory module is used to store the gamma parameter that segmentation is in advance produced to gamma curve, and the length of the input interval of each straightway is 2 k power; Described gamma parameter comprises input value, output valve, the input of terminating point, the output valve of each straightway starting point, and the k value of each straightway;
The gamma correction module utilizes input value to be corrected and gamma parameter to calculate, and utilizes the k position that moves to right to realize division to this straightway input interval exporting the correction value output that calculates to the output image memory cell.
7, device as claimed in claim 6 is characterized in that: the gamma correction module also comprises judging unit, query unit and computing unit, wherein:
Judging unit is used to judge the straightway from the pairing gamma curve of input value to be corrected of input picture memory module;
Query unit is used to inquire about gamma parameter memory module database, and obtains the gamma parameter of input value to be corrected institute line correspondence section and be transferred to computing unit;
Computing unit utilizes input value to be corrected and the gamma parameter that obtained to calculate, and utilizes the k position that moves to right to realize division to this straightway input interval exporting the correction value output that calculates to the output image memory cell.
8, method as claimed in claim 7 is characterized in that: computing unit by first subtract that logical block, second subtracts logical block, takes advantage of logical block, the logical block that moves to right and add logical block and constitute, wherein the input/output relation of each logical block is as follows:
Input value to be corrected is the input value of this computing unit;
Input value to be corrected and this straightway starting point input value are respectively first first, second input value that subtracts logical block;
The output valve of the terminating point output valve of this straightway and the starting point of this straightway is respectively second first, second input value that subtracts logical block;
First output valve and second output valve that subtracts logical block that subtracts logical block is respectively first, second input value of taking advantage of logical block;
Take advantage of the k value of the output valve of logical block and this straightway to be respectively first, second input value of the logical block that moves to right;
The logical block that moves to right output valve and the output valve of the starting point of this straightway be respectively first, second output valve that adds logical block;
The output valve that adds logical block is the output valve of this computing unit.
9, method as claimed in claim 7 is characterized in that: the formula that computing unit is finished is: y=((x-x1) * (y2-y1)＞＞k)+y1 or y=((x-x1)＞＞k) * (y2-y1)+y1.
10, a kind of device of gamma correction is characterized in that: this device comprises gamma parameter memory module and gamma correction module, wherein:
The gamma parameter memory module is used to store the gamma parameter that segmentation is in advance produced to gamma curve, and the length of the input interval of each straightway is 2 k power; Described gamma parameter comprises input value, output valve, the input of terminating point, the output valve of each straightway starting point, and the k value of each straightway;
The gamma correction module utilizes input value to be corrected and gamma parameter to calculate, and utilizes the k position that moves to right to realize division to this straightway input interval exporting the correction value output that calculates to the output image memory cell.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101771827A (en) * | 2008-12-29 | 2010-07-07 | 深圳艾科创新微电子有限公司 | Device and method for regulating image brightness by gamma |
| CN101998128A (en) * | 2009-08-24 | 2011-03-30 | 索尼公司 | Image display device, image display method, and image processing device |
| CN101546530B (en) * | 2008-03-28 | 2011-06-15 | 群康科技(深圳)有限公司 | Gamma lookup table storage method |
| CN102098421A (en) * | 2010-12-08 | 2011-06-15 | 四川长虹电器股份有限公司 | Automatic smoothing method of GAMMA data of liquid crystal display television (LCDTV) |
| CN101556759B (en) * | 2008-04-02 | 2011-12-14 | 英属开曼群岛商恒景科技股份有限公司 | Apparatus and method for gamma correction |
| CN105407296A (en) * | 2015-11-18 | 2016-03-16 | 腾讯科技（深圳）有限公司 | Real-time video enhancement method and device |
| CN110299099A (en) * | 2014-02-10 | 2019-10-01 | 辛纳普蒂克斯日本合同会社 | Show equipment, display panel drive, image processing apparatus and image processing method |
| CN111402163A (en) * | 2020-03-17 | 2020-07-10 | 武汉精立电子技术有限公司 | Gamma correction system and method |
| CN114283724A (en) * | 2021-12-22 | 2022-04-05 | 珠海格力电器股份有限公司 | Gamma correction circuit, image processing apparatus, and display apparatus |
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| CN101546530B (en) * | 2008-03-28 | 2011-06-15 | 群康科技(深圳)有限公司 | Gamma lookup table storage method |
| CN101556759B (en) * | 2008-04-02 | 2011-12-14 | 英属开曼群岛商恒景科技股份有限公司 | Apparatus and method for gamma correction |
| CN101771827A (en) * | 2008-12-29 | 2010-07-07 | 深圳艾科创新微电子有限公司 | Device and method for regulating image brightness by gamma |
| US8451383B2 (en) | 2009-08-24 | 2013-05-28 | Sony Corporation | Image display device, image display method, and image processing device |
| CN101998128A (en) * | 2009-08-24 | 2011-03-30 | 索尼公司 | Image display device, image display method, and image processing device |
| CN101998128B (en) * | 2009-08-24 | 2013-08-21 | 索尼公司 | Image display device, image display method, and image processing device |
| CN102098421A (en) * | 2010-12-08 | 2011-06-15 | 四川长虹电器股份有限公司 | Automatic smoothing method of GAMMA data of liquid crystal display television (LCDTV) |
| CN102098421B (en) * | 2010-12-08 | 2012-09-26 | 四川长虹电器股份有限公司 | Automatic smoothing method of GAMMA data of liquid crystal display television (LCDTV) |
| CN110299099A (en) * | 2014-02-10 | 2019-10-01 | 辛纳普蒂克斯日本合同会社 | Show equipment, display panel drive, image processing apparatus and image processing method |
| CN105407296A (en) * | 2015-11-18 | 2016-03-16 | 腾讯科技（深圳）有限公司 | Real-time video enhancement method and device |
| US10878543B2 (en) | 2015-11-18 | 2020-12-29 | Tencent Technology (Shenzhen) Company Limited | Group management method, terminal, and storage medium |
| CN111402163A (en) * | 2020-03-17 | 2020-07-10 | 武汉精立电子技术有限公司 | Gamma correction system and method |
| CN114283724A (en) * | 2021-12-22 | 2022-04-05 | 珠海格力电器股份有限公司 | Gamma correction circuit, image processing apparatus, and display apparatus |
| CN114283724B (en) * | 2021-12-22 | 2023-08-11 | 珠海格力电器股份有限公司 | Gamma correction circuit, image processing apparatus, and display apparatus |
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