CN100508625C - Device and method for image contrast reinforcement - Google Patents
Device and method for image contrast reinforcement Download PDFInfo
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- CN100508625C CN100508625C CNB2004100867588A CN200410086758A CN100508625C CN 100508625 C CN100508625 C CN 100508625C CN B2004100867588 A CNB2004100867588 A CN B2004100867588A CN 200410086758 A CN200410086758 A CN 200410086758A CN 100508625 C CN100508625 C CN 100508625C
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Abstract
This invention relates to one image comparison strengthening device, which comprises the following parts: brightness definition conversion device to receive first brightness signal and first and second color signals to output second brightness signals; brightness comparison adjusting device to receive the second brightness signal to output third brightness signal; brightness and color compensation device to receive first brightness signal, first and second color signals, second brightness signal and third bright signal to output fourth brightness signal, third and fourth color signal. This invention defines the brightness signal with weight value through long bar statistics and brightness curve to process the proportion relationship as image original brightness signal parameters.
Description
Technical field
The present invention relates to the device and method that a kind of image contrast is strengthened, particularly relate to a kind of extra definition luminance signal device and method of the image contrast reinforcement of parameter by way of compensation.
Background technology
Up to now, existing many practices of strengthening for the color of show image all are distributed as the master with the rectangular statistical chart of picture frame (frame histogram) of considering luminance signal (luminance signal), just the graph of a relation of its brightness value of show image (code) respective amount.
Please refer to Fig. 1, Fig. 1 is the circuit diagram that the rectangular statistical chart of existing use extracts the contrast of strengthening show image.In Fig. 1, luminance signal (Y) is behind rectangular statistical chart draw-out device 110, bar chart statistical chart draw-out device 110 can calculate the brightness value of luminance signal (Y), and obtain the Luminance Distribution information 115 of brightness value institute respective amount according to the bar chart statistical chart of bar chart statistical chart draw-out device 110, and distribution signal 115 is after bar chart statistical chart draw-out device 110 output, and brightness curve (brightness gets relation curve with brightness value) installs 120 brightness curves that can obtain corresponding new luminance signal (Y ') according to this distribution signal 115.
Therefore, in its luminance signal of each picture frame (Y) of show image, chroma signals (U or C1) and the chroma signals (V or C2), only there is luminance signal (Y) to obtain new luminance signal (Y ') according to bar chart statistics draw-out device 110 control backs.And existing this kind practice can be improved the contrast of show image.
Though the above-mentioned existing practice can be improved the contrast of show image, but this practice in some cases, chroma is constant because the show image of these well afoots has only the brightness change, promptly therefore lose the saturation of show image, indirectly, the situation that limit on its picture frame of the show image of these well afoots between pattern and pattern has obfuscation produces, just edge effect (side effect).
For fear of this edge effect problem, prior art obtains also using a compensation mechanism the new luminance signal except utilizing rectangular statistical chart to extract, with the compensation chroma signals.Please refer to Fig. 2, for existing another made the circuit diagram that contrast is strengthened to show image.In Fig. 2, luminance signal (Y) except by bar chart statistics draw-out device 110, brightness curve device 120 to obtain the new luminance signal (Y '), also by a color compensator 210 and according to luminance signal (Y) and new luminance signal (Y '), obtain new chroma signals (U ' or C1 ') and new chroma signals (V ' or C2 ') with compensation.And under the compensation mechanism that is provided by color compensation device 210, its each picture frame of show image chroma signals (U or C1), chroma signals (V or C2) originally also can be compensated, thereby improves the edge effect problem that might take place.
Prior art also has some and Fig. 1, Fig. 2 similarly to utilize rectangular statistical chart to extract to strengthen the practice of show image contrast, no longer illustrates at this.
But, extract to adjust show image brightness by rectangular statistical chart existing, and compensation show image chroma the time, the brightness that its picture of show image is presented may not be expected that but promptly the brightness of color may not be expected by the beholder on the show image by the beholder.Therefore, existing show image that the practice presents is still desirable not to the utmost.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of device and method of image contrast reinforcement, when adjusting show image brightness, also can consider the brightness performance of its chroma of show image, expect so that its brightness of show image and chroma can meet the beholder.
To achieve these goals, the invention provides the device that a kind of image contrast is strengthened, it is characterized in that, comprise: brightness definition conversion equipment, receive one first luminance signal, one first chroma signals and one second chroma signals, and add up again after this first luminance signal, this first chroma signals and this second chroma signals multiplied each other with one first weighted signal, one second weighted signal and one the 3rd weighted signal respectively, to produce one second luminance signal; One brightness contrast adjusting device utilizes the statistics of this second luminance signal to produce a brightness curve, and with this second luminance signal to should brightness curve, to produce one the 3rd luminance signal; And a brightness and a color compensation device, utilize this second luminance signal and the 3rd luminance signal to produce a parameter signal, and this parameter signal multiplied each other with this first luminance signal, this first chroma signals and this second chroma signals respectively, to produce one the 4th luminance signal, one the 3rd chroma signals and one the 4th chroma signals.
The device that above-mentioned image contrast is strengthened is characterized in that, this brightness definition conversion equipment comprises: one first multiplier, multiply each other this first luminance signal and this first weighted signal, to produce one first luminance weighted signal; One second multiplier multiplies each other this first chroma signals and this second weighted signal, to produce one second luminance weighted signal; One the 3rd multiplier multiplies each other this second chroma signals and the 3rd weighted signal, to produce one the 3rd luminance weighted signal; And an adder, with this first luminance weighted signal, this second luminance weighted signal and the 3rd luminance weighted signal plus, to produce this second luminance signal.
The device that above-mentioned image contrast is strengthened is characterized in that this brightness contrast adjusting device also comprises:
One rectangular statistical chart draw-out device receives this second luminance signal, and statistics produces a statistics source map; And a brightness curve device, figure produces a brightness curve according to this statistics, and this second luminance signal is corresponded to this brightness curve, to produce the 3rd luminance signal.
The device that above-mentioned image contrast is strengthened is characterized in that this brightness and color compensation device more comprise:
One arithmetic unit receives this second and the 3rd luminance signal to produce this parameter signal; One the 4th multiplier multiplies each other this parameter signal and this first luminance signal, to produce the 4th luminance signal; One the 5th multiplier multiplies each other this parameter signal and this first chroma signals, to produce the 3rd chroma signals; And one the 6th multiplier, this parameter signal and this second chroma signals are multiplied each other, to produce the 4th chroma signals.
The device that the present invention also provides a kind of image contrast to strengthen, it is characterized in that, comprise: brightness definition conversion equipment, receive one first luminance signal, one first chroma signals and one second chroma signals, and add up again after this first luminance signal, this first chroma signals and this second chroma signals multiplied each other with one first weighted signal, one second weighted signal and one the 3rd weighted signal respectively, to produce one second luminance signal; One brightness shift unit, this second luminance signal that is used to be shifted is to produce one second brightness shift signal; One brightness contrast adjusting device utilizes this second brightness shift signal statistics to produce a brightness curve, and this second brightness shift signal is corresponded to this brightness curve, to produce one the 3rd luminance signal; One black level/bright level extension apparatus, be used to adjust the 3rd luminance signal that is positioned at black rank/zone, bright rank, to produce one the 3rd brightness adjusting signal: and brightness and color compensation device, utilize this second luminance signal and the 3rd brightness adjusting signal to produce a parameter signal, and this parameter signal multiplied each other with this first luminance signal, this first chroma signals and this second chroma signals respectively, to produce and to export one the 4th luminance signal, one the 3rd chroma signals and one the 4th chroma signals.
The device that above-mentioned image contrast is strengthened is characterized in that, this brightness definition conversion equipment comprises: one first multiplier, multiply each other this first luminance signal and this first weighted signal, to produce one first luminance weighted signal; One second multiplier multiplies each other this first chroma signals and this second weighted signal, to produce one second luminance weighted signal; One the 3rd multiplier multiplies each other this second chroma signals and the 3rd weighted signal, to produce one the 3rd luminance weighted signal; And an adder, with this first luminance weighted signal, this second luminance weighted signal and the 3rd luminance weighted signal plus, to produce this second luminance signal.
The device that above-mentioned image contrast is strengthened is characterized in that this brightness contrast adjusting device also comprises: a rectangular statistical chart draw-out device receive this second brightness shift signal, and statistics produces a statistics source map; And a brightness curve device, figure produces a brightness curve according to this statistics, and this second brightness shift signal is corresponded to this brightness curve, to produce the 3rd luminance signal.
The device that above-mentioned image contrast is strengthened, it is characterized in that this brightness and color compensation device also comprise: an arithmetic unit receives this second luminance signal and the 3rd brightness adjusting signal to produce this parameter signal; One the 4th multiplier multiplies each other this parameter signal and this first luminance signal, to produce the 4th luminance signal; One the 5th multiplier multiplies each other this parameter signal and this first chroma signals, to produce the 3rd chroma signals; And one the 6th multiplier, this parameter signal and this second chroma signals are multiplied each other, to produce the 4th chroma signals.
The method that the present invention also provides a kind of image contrast to strengthen, it is characterized in that, comprise: receive one first luminance signal, one first chroma signals and one second chroma signals, and add up again after this first luminance signal, this first chroma signals and this second chroma signals multiplied each other with one first weighted signal, one second weighted signal and one the 3rd weighted signal respectively, to produce one second luminance signal; Utilize this second luminance statistic data to produce a brightness curve, and this second brightness is corresponded to this brightness curve, to produce one the 3rd luminance signal; And utilize this second luminance signal and the 3rd luminance signal to produce a parameter signal, and this parameter signal is multiplied each other with this first luminance signal, this first chroma signals and this second chroma signals respectively, to produce and to export one the 4th luminance signal.
The method that above-mentioned image contrast is strengthened is characterized in that, also comprises: according to this this parameter signal, compensate this first chroma signals and this second chroma signals, to produce one the 3rd chroma signals and the 4th chroma signals.
The method that above-mentioned image contrast is strengthened is characterized in that, also comprises: contrast a rectangular statistical chart to obtain a Luminance Distribution information corresponding with this second luminance signal with this second luminance signal; And contrast a brightness curve figure to obtain and a distribute brightness curve of the 3rd corresponding luminance signal of this monochrome information with this Luminance Distribution information.
The method that above-mentioned image contrast is strengthened is characterized in that, according to this brightness curve of this second luminance signal and the 3rd luminance signal, to compensate this first chroma signals and this second chroma signals.
The method that the present invention also provides a kind of image contrast to strengthen, it is characterized in that, comprise: receive one first luminance signal, one first chroma signals and one second chroma signals, and add up again after this first luminance signal, this first chroma signals and this second chroma signals multiplied each other with one first weighted signal, one second weighted signal and one the 3rd weighted signal respectively, to produce one second luminance signal; This second luminance signal that is used to be shifted is to produce one second brightness shift signal; Utilize this second brightness shift signal statistics to produce a brightness curve, and this second brightness shift signal is corresponded to this brightness curve, to produce one the 3rd luminance signal; Be used to adjust the 3rd luminance signal that is positioned at black rank/zone, bright rank, to produce one the 3rd brightness adjusting signal; And utilize this second luminance signal and the 3rd brightness adjusting signal to produce a parameter signal, and this parameter signal multiplied each other with this first luminance signal, this first chroma signals and this second chroma signals respectively, to produce and to export one the 4th luminance signal, one the 3rd chroma signals and one the 4th chroma signals.
The method that above-mentioned image contrast is strengthened is characterized in that, also comprises: according to this parameter signal, compensate this first chroma signals and this second chroma signals, to produce one the 3rd chroma signals and one the 4th chroma signals.
The method that above-mentioned image contrast is strengthened is characterized in that, also comprises: contrast a rectangular statistical chart to obtain a Luminance Distribution information corresponding with this second brightness shift signal with this second brightness shift signal; And contrast a brightness curve figure to obtain and a distribute brightness curve of the 3rd corresponding luminance signal of this monochrome information with this Luminance Distribution information.
The method that above-mentioned image contrast is strengthened is characterized in that, according to this brightness curve of this second luminance signal and the 3rd luminance signal, to compensate this first chroma signals and this second chroma signals.
The method that above-mentioned image contrast is strengthened is characterized in that, the pairing quantity in the accurate position of the input of this Luminance Distribution information is big more, and the slope of the pairing brightness curve of this Luminance Distribution information is big more.20, the method for image contrast reinforcement according to claim 15, it is characterized in that, also comprise: adjust the 3rd luminance signal near brightness critical values, if the 3rd luminance signal is then heightened the brightness value of the 3rd luminance signal near peak, but be no more than peak, if the 3rd luminance signal near minimum, is then turned down the brightness value of the 3rd luminance signal, but is no more than minimum.
Effect of the present invention, be to define the luminance signal that comprises the chroma weighted value, and the luminance signal of this redetermination is through rectangular statistical chart extracts and the proportionate relationship of brightness curve before and after handling can be in order to as show image luminance signal and chroma signals compensation originally time the parameter, therefore, its picture of show image after the processing has preferable saturation, and it is required more to meet the beholder.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the circuit diagram that the rectangular statistical chart of existing use extracts the contrast of strengthening show image;
Fig. 2 makes the circuit diagram that contrast is strengthened for existing another to showing kind image;
Fig. 3 is the schematic diagram of the image contrast stiffening device of preferred embodiment of the present invention;
Fig. 4 is the operational flowchart of the contrast stiffening device of preferred embodiment of the present invention;
Fig. 5 is the schematic diagram of the image contrast stiffening device in another preferred embodiment of the present invention;
Fig. 6 is the operational flowchart of the image contrast stiffening device in another preferred embodiment of the present invention;
Fig. 7 is the comparison diagram of the rectangular statistical chart draw-out device output of luminance signal displacement anteroposterior diameter;
Fig. 8 is continuous signal resulting brightness curve after the conversion of brightness curve device of rectangular statistical chart draw-out device output;
Fig. 9 is for adjusting the schematic diagram of the accurate position of luminance signal ash level;
Figure 10 is the schematic diagram of show image through each step process of the present invention.
Wherein, Reference numeral:
110, the rectangular statistical chart draw-out device of 321-
120,323-brightness curve device
21-brightness and color compensation device
300,500-contrast stiffening device
310-brightness definition conversion equipment
311,313,315,333,335,337-multiplier
The 317-adder, 320-brightness contrast adjusting device
330-brightness and color compensation device
341,343,345-weighted signal
350,360,540,550,560-luminance signal
355-Luminance Distribution information
401 ~ 404,601 ~ 606-step
510-brightness shift unit
The black level of 530-/bright level extension apparatus
Embodiment
Please refer to Fig. 3, be the schematic diagram of the image contrast stiffening device of preferred embodiment of the present invention.This contrast stiffening device 300 is made up of brightness definition conversion equipment 310, brightness contrast adjusting device 320 and brightness and color compensation device 330.Wherein, brightness definition conversion equipment 310 is made up of multiplier 311,313,315 and adder 317; Brightness contrast adjusting device 320 is by being made up of rectangular statistical chart draw-out device 321 and brightness curve device 323; Brightness and color compensation device 330 are by being made up of arithmetic unit 331, multiplier 333,335,337.
The flow chart of this contrast stiffening device 300 operation please refer to Fig. 4, is the operational flowchart of the contrast stiffening device of preferred embodiment of the present invention.At first, step 401, the multiplier 311,313,315 in the brightness definition conversion equipment 310 receives the luminance signal (Y) of representing the show image pixel and chroma signals (U), chroma signals (V) respectively.Simultaneously, multiplier 311,313,315 is except that receiving luminance signal (Y) and chroma signals (U), chroma signals (V) respectively, also receive weighted signal 341,343,345 respectively with the output of multiplying each other, adder 317 then reception by the luminance signal 350 of multiplier 311,313,315 with addition output redetermination.Therefore, step 402, luminance signal (Y) and chroma signals (U), chroma signals (V) are synthetic after weighted signal 341,343,345 weightings respectively, can obtain the luminance signal 350 of redetermination.If luminance signal (Y) and chroma signals (U), chroma signals (V) represent with Y, U, V respectively, weighted signal 311,313,315 represents with W1, W2, W3 respectively, and the luminance signal of redetermination represents with Ynew, then Ynew=W1 * Y+W2 * U+W3 * V.
Then, step 403, with the input of the luminance signal 350 of redetermination as brightness contrast adjusting device 320, with the luminance signal 360 after obtaining extracting, wherein luminance signal 350 can corresponding be found out the distributed number situation of these luminance signal 350 its accurate positions of ash level at show image behind rectangular statistical chart draw-out device 321, and rectangular statistical chart draw-out device 321 can be exported the Luminance Distribution information 355 of representing this luminance signal 350 its distributed number on show image, brightness curve device 323 is then imported the brightness curve of back corresponding conversion according to luminance signal 350 control Luminance Distribution information 355, and the luminance signal 360 of this brightness curve is represented in 323 outputs of brightness curve device.
At last, step 404, color compensation device 330 is respectively according to the luminance signal 350 of the resulting redetermination of step 402 and the luminance signal 360 after the resulting extraction of step 403 and by arithmetic unit 331 computings, to obtain a ratio value 365, and again by multiplier 333,335,337 with ratio value 365 and show image script luminance signal (Y), chroma signals (U), output after chroma signals (V) multiplies each other, with as to luminance signal (Y), chroma signals (U), the contrast of chroma signals (V) compensation is to obtain new luminance signal (Y '), chroma signals (U '), chroma signals (V ').
Please refer to Fig. 5, be the schematic diagram of the image contrast stiffening device in another preferred embodiment of the present invention.This contrast stiffening device 500 still has brightness definition conversion equipment 310, brightness contrast adjusting device 320 and brightness and color compensation device 330, and specifically, this contrast stiffening device 500 also has brightness shift unit 510 and black level/bright level extension apparatus 530.Therefore, these contrast stiffening device 500 its operational flowcharts are also different.
Please refer to Fig. 6, be the operational flowchart of the image contrast stiffening device in another preferred embodiment of the present invention.At the beginning, step 601,602 with Fig. 4 in step 401,402 identical.Then, step 603 is by the luminance signal 540 of luminance signal 350 to obtain being shifted of brightness shift unit 510 shift step 602 resulting redeterminations.Therefore, step 604, the input of brightness contrast adjusting device 320 will change the luminance signal 540 of displacement into, promptly to luminance signal 540 extraction doing to distribute on the show image of displacement, with the luminance signal 550 after obtaining extracting.
Wherein, please refer to Fig. 7, be the comparison diagram of the rectangular statistical chart draw-out device output of luminance signal displacement anteroposterior diameter.In Fig. 7, the left side is that luminance signal 350 is through rectangular statistical chart draw-out device 321 outputs, it is the schematic diagram of Luminance Distribution information 355, right-hand part then is that luminance signal 350 is after displacement, be that luminance signal 540 is through rectangular statistical chart draw-out device 321 output, the i.e. schematic diagrames of Luminance Distribution information 355.As shown in Figure 7, when the input signal of rectangular statistical chart draw-out device 321 was shifted, the output of its correspondence is displacement relatively also.Refer again to Fig. 8, be Luminance Distribution information resulting brightness curve after the conversion of brightness curve device of rectangular statistical chart draw-out device output.In Fig. 8, after 323 conversions of brightness curve device, can obtain corresponding brightness curve by the Luminance Distribution information 355 of the rectangular statistical chart draw-out device of Fig. 5 321 outputs.Wherein, the quantity that is distributed as according to its accurate position of input of Luminance Distribution information of brightness curve distributes.For instance, when the pairing quantity in the accurate position of its input of Luminance Distribution information was big more, its slope of the pairing brightness curve of this Luminance Distribution information was big more.
Step 605 utilizes black level/bright level extension apparatus 530 to do the adjustment that the ash level is extended by the resulting luminance signal 550 of step 604, to obtain the luminance signal 560 that the ash level is extended.And this luminance signal 550 is done grey grade extension, can adjust near the luminance signal 550 of critical value at accurate of ash level.Please refer to Fig. 9, for adjusting the schematic diagram of the accurate position of luminance signal ash level.Black level/bright level extension apparatus 530 can adjust at the accurate position of the input of luminance signal 550 (i.e. the accurate position of ash level of itself), when the accurate position of the input of luminance signal 550 during near maximum, heighten the accurate position of output of luminance signal 550, but the maximum magnitude of heightening is for being no more than maximum; Relatively, when the accurate position of the input of luminance signal 550 during near minimum, the accurate position of output of turning down luminance signal 550, but the maximum magnitude of turning down is for being no more than minimum.Therefore, the accurate position of luminance signal 550 its inputs is near maximum or near minimum value the time, the accurate position of corresponding output will be heightened or turn down, and make that luminance signal 550 can be brighter when belonging to the accurate position of bright ash level scope, it can be darker when belonging to the accurate position of dull gray level scope, makes that just the show image pixel can be more obvious in bright contrast.
At last, similar with the step 404 among Fig. 4, the relation that the luminance signal that color compensation device 330 extends according to the luminance signal 540 of the resultant displacement of step 603 and according to the resultant ash level of step 605 respectively is 560, compensating by 330 pairs of show images of brightness and color compensation device luminance signal (Y), chroma signals (U), chroma signals (V) originally, with obtain new luminance signal (Y ') outward, chroma signals (U '), chroma signals (V ').
And, please refer to Figure 10 by the high quality more of the picture after by the present invention show image do to strengthen being handled, be the schematic diagram of show image through each step process of the present invention.In Figure 10, its left side of original show image is fuzzy, right-hand part almost presents black, and original show image is after redetermination, displacement and brightness curve conversion, and its left side pattern becomes clearer, and the contrast of right-hand part pattern also become more obvious.Then, extend by the accurate position of ash level and to handle, show image becomes contrast clearer, the right-hand part pattern becomes obviously except the left side pattern, and the brightness light and shade contrast of whole image obviously improves.At last, the processing by color compensation again is so that show image obtains the required color contrast of beholder.
Comprehensively above-mentioned, the invention provides the device and method that a kind of image contrast is strengthened, the show image chroma is considered for the effect of brightness, comprise the chroma weighted value and get luminance signal to define, and the luminance signal of this redetermination is through rectangular statistical chart extracts and the proportionate relationship of brightness curve before and after handling can be in order to as show image luminance signal and chroma signals compensation originally time the parameter, therefore, to have preferable saturation by its picture of show image after the present invention's processing, it is required more to meet the beholder.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of claim of the present invention.
Claims (16)
1, a kind of device of image contrast reinforcement is characterized in that, comprising:
One brightness definition conversion equipment, receive one first luminance signal, one first chroma signals and one second chroma signals, and add up again after this first luminance signal, this first chroma signals and this second chroma signals multiplied each other with one first weighted signal, one second weighted signal and one the 3rd weighted signal respectively, to produce one second luminance signal;
One brightness contrast adjusting device utilizes the statistics of this second luminance signal to produce a brightness curve, and with this second luminance signal to should brightness curve, to produce one the 3rd luminance signal; And
One brightness and color compensation device, utilize this second luminance signal and the 3rd luminance signal to produce a parameter signal, and this parameter signal multiplied each other with this first luminance signal, this first chroma signals and this second chroma signals respectively, to produce one the 4th luminance signal, one the 3rd chroma signals and one the 4th chroma signals.
2, the device of image contrast reinforcement according to claim 1 is characterized in that, this brightness definition conversion equipment comprises:
One first multiplier multiplies each other this first luminance signal and this first weighted signal, to produce one first luminance weighted signal;
One second multiplier multiplies each other this first chroma signals and this second weighted signal, to produce one second luminance weighted signal;
One the 3rd multiplier multiplies each other this second chroma signals and the 3rd weighted signal, to produce one the 3rd luminance weighted signal; And
One adder is with this first luminance weighted signal, this second luminance weighted signal and the 3rd luminance weighted signal plus, to produce this second luminance signal.
3, the device of image contrast reinforcement according to claim 1 is characterized in that this brightness contrast adjusting device comprises:
One rectangular statistical chart draw-out device receives this second luminance signal, and statistics produces a statistics source map; And
One brightness curve device, figure produces a brightness curve according to this statistics, and this second luminance signal is corresponded to this brightness curve, to produce the 3rd luminance signal.
4, the device of image contrast reinforcement according to claim 1 is characterized in that this brightness and color compensation device comprise:
One arithmetic unit receives this second and the 3rd luminance signal to produce this parameter signal;
One the 4th multiplier multiplies each other this parameter signal and this first luminance signal, to produce the 4th luminance signal;
One the 5th multiplier multiplies each other this parameter signal and this first chroma signals, to produce the 3rd chroma signals; And
One the 6th multiplier multiplies each other this parameter signal and this second chroma signals, to produce the 4th chroma signals.
5, a kind of device of image contrast reinforcement is characterized in that, comprising:
One brightness definition conversion equipment, receive one first luminance signal, one first chroma signals and one second chroma signals, and add up again after this first luminance signal, this first chroma signals and this second chroma signals multiplied each other with one first weighted signal, one second weighted signal and one the 3rd weighted signal respectively, to produce one second luminance signal;
One brightness shift unit, this second luminance signal that is used to be shifted is to produce one second brightness shift signal;
One brightness contrast adjusting device utilizes this second brightness shift signal statistics to produce a brightness curve, and this second brightness shift signal is corresponded to this brightness curve, to produce one the 3rd luminance signal;
One black level/bright level extension apparatus is used to adjust the 3rd luminance signal that is positioned at black rank/zone, bright rank, to produce one the 3rd brightness adjusting signal; And
One brightness and color compensation device, utilize this second luminance signal and the 3rd brightness adjusting signal to produce a parameter signal, and this parameter signal multiplied each other with this first luminance signal, this first chroma signals and this second chroma signals respectively, to produce and to export one the 4th luminance signal, one the 3rd chroma signals and one the 4th chroma signals.
6, the device of image contrast reinforcement according to claim 5 is characterized in that, this brightness definition conversion equipment comprises:
One first multiplier multiplies each other this first luminance signal and this first weighted signal, to produce one first luminance weighted signal;
One second multiplier multiplies each other this first chroma signals and this second weighted signal, to produce one second luminance weighted signal;
One the 3rd multiplier multiplies each other this second chroma signals and the 3rd weighted signal, to produce one the 3rd luminance weighted signal; And
One adder is with this first luminance weighted signal, this second luminance weighted signal and the 3rd luminance weighted signal plus, to produce this second luminance signal.
7, the device of image contrast reinforcement according to claim 5 is characterized in that this brightness contrast adjusting device comprises:
One rectangular statistical chart draw-out device receives this second brightness shift signal, and statistics produces a statistics source map; And
One brightness curve device, figure produces a brightness curve according to this statistics, and this second brightness shift signal is corresponded to this brightness curve, to produce the 3rd luminance signal.
8, the device of image contrast reinforcement according to claim 5 is characterized in that this brightness and color compensation device comprise:
One arithmetic unit receives this second luminance signal and the 3rd brightness adjusting signal to produce this parameter signal;
One the 4th multiplier multiplies each other this parameter signal and this first luminance signal, to produce the 4th luminance signal;
One the 5th multiplier multiplies each other this parameter signal and this first chroma signals, to produce the 3rd chroma signals; And
One the 6th multiplier multiplies each other this parameter signal and this second chroma signals, to produce the 4th chroma signals.
9, a kind of method of image contrast reinforcement is characterized in that, comprising:
Receive one first luminance signal, one first chroma signals and one second chroma signals, and add up again after this first luminance signal, this first chroma signals and this second chroma signals multiplied each other with one first weighted signal, one second weighted signal and one the 3rd weighted signal respectively, to produce one second luminance signal;
Utilize the statistics of this second brightness to produce a brightness curve, and this second brightness is corresponded to this brightness curve, to produce one the 3rd luminance signal; And
Utilize this second luminance signal and the 3rd luminance signal to produce a parameter signal, and this parameter signal multiplied each other with this first luminance signal, this first chroma signals and this second chroma signals respectively, to produce and to export one the 4th luminance signal, one the 3rd chroma signals and one the 4th chroma signals.
10, the method for image contrast reinforcement according to claim 9 is characterized in that, also comprises:
Contrast a rectangular statistical chart to obtain a Luminance Distribution information corresponding with this second luminance signal with this second luminance signal; And
Contrast a brightness curve figure to obtain a brightness curve of three luminance signal corresponding with this Luminance Distribution information with this Luminance Distribution information.
11, the method for image contrast reinforcement according to claim 10 is characterized in that, according to this brightness curve of this second luminance signal and the 3rd luminance signal, to compensate this first chroma signals and this second chroma signals.
12, a kind of method of image contrast reinforcement is characterized in that, comprising:
Receive one first luminance signal, one first chroma signals and one second chroma signals, and add up again after this first luminance signal, this first chroma signals and this second chroma signals multiplied each other with one first weighted signal, one second weighted signal and one the 3rd weighted signal respectively, to produce one second luminance signal;
This second luminance signal that is shifted is to produce one second brightness shift signal;
Utilize the statistics of this second brightness shift signal to produce a brightness curve, and this second brightness shift signal is corresponded to this brightness curve, to produce one the 3rd luminance signal;
Adjustment is positioned at the 3rd luminance signal in black rank/zone, bright rank, to produce one the 3rd brightness adjusting signal; And
Utilize this second luminance signal and the 3rd brightness adjusting signal to produce a parameter signal, and this parameter signal multiplied each other with this first luminance signal, this first chroma signals and this second chroma signals respectively, to produce and to export one the 4th luminance signal, one the 3rd chroma signals and one the 4th chroma signals.
13, the method for image contrast reinforcement according to claim 12 is characterized in that, comprising:
Contrast a rectangular statistical chart to obtain a Luminance Distribution information corresponding with this second brightness shift signal with this second brightness shift signal; And
Contrast a brightness curve figure to obtain a brightness curve of three luminance signal corresponding with this Luminance Distribution information with this Luminance Distribution information.
14, the method for image contrast reinforcement according to claim 13 is characterized in that, according to this brightness curve of this second luminance signal and the 3rd luminance signal, to compensate this first chroma signals and this second chroma signals.
15, the method strengthened of image contrast according to claim 13 is characterized in that, according to the population size of this Luminance Distribution information to determine the slope of this brightness curve.
16, the method for image contrast reinforcement according to claim 12, it is characterized in that, comprise: adjust the 3rd luminance signal near brightness critical values, if the 3rd luminance signal is then heightened the brightness value of the 3rd luminance signal near peak, but be no more than peak, if the 3rd luminance signal near minimum, is then turned down the brightness value of the 3rd luminance signal, but is no more than minimum.
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| CNB2004100867588A CN100508625C (en) | 2004-11-01 | 2004-11-01 | Device and method for image contrast reinforcement |
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| CN101877759B (en) * | 2009-04-30 | 2012-09-05 | 晨星软件研发(深圳)有限公司 | Device and method for processing image |
| CN101621702B (en) * | 2009-07-30 | 2011-08-24 | 北京海尔集成电路设计有限公司 | Method and device for automatically adjusting chroma and saturation |
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