CN103873839A - Image processing apparatus and method thereof - Google Patents

Image processing apparatus and method thereof Download PDF

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Publication number
CN103873839A
CN103873839A CN201210539911.2A CN201210539911A CN103873839A CN 103873839 A CN103873839 A CN 103873839A CN 201210539911 A CN201210539911 A CN 201210539911A CN 103873839 A CN103873839 A CN 103873839A
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China
Prior art keywords
pixel data
original
signal
ti
carrier chrominance
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CN201210539911.2A
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Chinese (zh)
Inventor
林裕贸
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联咏科技股份有限公司
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Priority to CN201210539911.2A priority Critical patent/CN103873839A/en
Publication of CN103873839A publication Critical patent/CN103873839A/en

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Abstract

Provided are an image processing apparatus and a method thereof, used for sharpening the edge of images. The image processing apparatus comprises a transient improvement (TI) circuit and a color protection circuit. The TI circuit receives a plurality of sets of original pixel data and performs TI processing on the original target pixel data among the original pixel data so as to output first and second TI chrominance signals corresponding with the original target pixel data. The color protection circuit respectively compares the first and second TI chrominance signals with the first and second TI original chrominance signals of the original pixel data one by one so as to correspondingly generate weight values, and outputs first and second adjusted chrominance signals in dependence on the weight values, the first and second original chrominance signals and the first and second TI chrominance signals.

Description

Image processing apparatus and method thereof

Technical field

The present invention relates to a kind of image processing apparatus and method thereof, and be particularly related to a kind of image processing apparatus and method thereof of the clear-cut margin that makes image.

Background technology

In recent years, due to the fast development of multimedia application, industry also increases for the demand of image processing techniques thereupon.Transient improvement (Transient Improvement, TI) technology is one of conventional image processing techniques.Transient improvement technology is the transition width (Transient Width) by shortening fuzzy edge in original image, to reach the effect of sharp keenization of image.

But traditional transient improvement technology exists the problem that the chromatic value of pixel cannot correctly be enhanced.For example, in color space YCbCr, when carrier chrominance signal Cb, the Cr of pixel data produce the phenomenon of tone distortion (color hue distorted) after transient improvement, so will make the image after transient improvement produce color zone errors in edge, and then reduced the quality of image.

Therefore, how providing a kind of image processing techniques that can promote transient improvement technology correctness, with the color mistake of effectively avoiding being produced after sharp keenization of image, is one of problem of endeavouring of industry.

Summary of the invention

The present invention relates to a kind of image processing techniques of sharp keenization of edge (edge boundary) that makes image, can effectively avoid the color mistake producing after sharp keenization of image.

According to an aspect of the present invention, a kind of image processing apparatus is proposed.Image processing apparatus comprises transient improvement circuit and color protection circuit.Transient improvement (Transient Improvement, TI) circuit is in order to receive complex raw pixel data, these raw pixel data comprise original target pixel data, every raw pixel data comprises an original luminance signal, one first original colourity (chroma) signal, with one second original chrominance values, this transient improvement circuit also carries out transient improvement processing to these original target pixel data, a TI pixel data with output corresponding to these original target pixel data, this TI pixel data comprises a TI luminance signal, one the one TI carrier chrominance signal, with one the 2nd TI carrier chrominance signal.Color protection circuit is in order to compare these first original chrominance values of a TI carrier chrominance signal and these raw pixel data one by one, and these second original chrominance values of the 2nd TI carrier chrominance signal and these raw pixel data are compared one by one, to produce accordingly a weighted value, and according to this weighted value, corresponding this first original chrominance values of these original target pixel data and this second original chrominance values, the one TI carrier chrominance signal and the 2nd TI carrier chrominance signal, export one first and adjust rear carrier chrominance signal and the rear carrier chrominance signal of one second adjustment.

According to a further aspect in the invention, propose a kind of image processing method, be used in an image processing apparatus, the method embodiment comprises the following steps.Receive complex raw pixel data, these raw pixel data comprise original target pixel data, every raw pixel data comprise an original luminance signal, one first original chrominance values, with one second original chrominance values; These original target pixel data are carried out to transient improvement processing, to export the TI pixel data corresponding to these original target pixel data, this TI pixel data comprise a TI luminance signal, one the one TI carrier chrominance signal, with one the 2nd TI carrier chrominance signal; These first original chrominance values of the one TI carrier chrominance signal and these raw pixel data are compared one by one, and these second original chrominance values of the 2nd TI carrier chrominance signal and these raw pixel data are compared one by one, to produce accordingly a weighted value; And according to this weighted value, corresponding this first original chrominance values of these original target pixel data and this second original chrominance values, a TI carrier chrominance signal and the 2nd TI carrier chrominance signal, output one first is adjusted rear carrier chrominance signal and one second and is adjusted rear carrier chrominance signal.

For there is to better understanding above-mentioned and other aspect of the present invention, special embodiment below, and coordinate accompanying drawing, be described in detail below:

Accompanying drawing explanation

Fig. 1 illustrates the calcspar of the image processing apparatus of one embodiment of the invention.

Fig. 2 illustrates the calcspar of an example of color protection circuit.

Fig. 3 illustrates the schematic diagram of transient improvement processing.

Fig. 4 illustrates the schematic diagram of an example of Difference test device.

Fig. 5 illustrates the corresponding relation schematic diagram of weighted value W and the corresponding heterochromia amount of heterochromia signal CD CDiff.

Fig. 6 illustrates the schematic diagram of an example of blender.

Fig. 7 illustrates the schematic diagram of an example of upper limit setting apparatus.

Fig. 8 illustrates the schematic diagram of an example of upper limit setting apparatus.

Fig. 9 illustrates the flow chart of the image processing method of the present embodiment.

[main element symbol description]

100: image processing apparatus

102: transient improvement circuit

104: color protection circuit

106: data control circuit

108: brightness improving device

Within 110: the first, colourity is improved device

Within 112: the second, colourity is improved device

202: Difference test device

204: weights corresponder

206: blender

402: difference computational unit

404: choose unit

602: the first mixed cells

604: the second mixed cells

702: upper limit setting apparatus

802: upper limit setting apparatus

Embodiment

Referring to Fig. 1 and Fig. 2, Fig. 1 illustrates the calcspar of the image processing apparatus 100 that is one embodiment of the invention, and Fig. 2 illustrates the calcspar of an example of color protection circuit 104 in the image processing apparatus 100 of Fig. 1.Image processing apparatus 100 comprises transient improvement circuit 102 and color protection circuit 104.Transient improvement circuit 102 is in order to receive many raw pixel data P (i), and i is the integer between 0 to N, and N is positive integer.This little raw pixel data P (0) ~ P (N) comprises an original target pixel data P (t), and t is the integer between 0 ~ N.Every raw pixel data comprise an original luminance signal Y (i), one first original chrominance values C1 (i), with one second original chrominance values C2 (i), transient improvement circuit 102 also carries out transient improvement processing to original target pixel data P (t), with output, corresponding to a TI pixel data of original target pixel data P (t), TI pixel data comprises a TI brightness signal Y ' (t), one the one TI carrier chrominance signal C1 ' (t), with one the 2nd TI carrier chrominance signal C2 ' (t).

For instance, transient improvement circuit 102 receives raw pixel data P (0) ~ P (30), wherein raw pixel data P (15) is original target pixel data, and raw pixel data P (0) ~ P (30) corresponds to respectively original luminance signal Y (0) ~ Y (30), first original chrominance values C1 (0) ~ C1 (30) and second original chrominance values C2 (0) ~ C2 (30).Transient improvement circuit 102 carries out transient improvement processing to original target pixel data P (15) after receiving raw pixel data P (0) ~ P (30), to export the TI brightness signal Y corresponding to original target pixel data P (15) ' (15), a TI carrier chrominance signal C1 ' (15) and the 2nd TI carrier chrominance signal C2 ' (15).

The color space of above-mentioned raw pixel data P is for example YCbCr color space or YUV color space.For example, if the color space of these a little raw pixel data P is YCbCr, included original luminance signal Y (i), the first original chrominance values C1 (i) of every raw pixel data, correspond to respectively luminance component Y, chromatic component Cb and the chromatic component Cr in YCbCr color space with the second original chrominance values C2 (i).In addition, above-mentioned original target pixel data are for example corresponding to the object pixel in display floater.

Color protection circuit 104 in order to by a TI carrier chrominance signal C1 ' (t) therewith these a little first original chrominance values C1 (0) ~ C1 (N) of a little raw pixel data P compare one by one; and by the 2nd TI carrier chrominance signal C2 ' (t) respectively therewith these a little second original chrominance values C2 (0) ~ C2 (N) of a little raw pixel data P (0) ~ P (N) compare one by one, to produce accordingly a weighted value W.Then, and according to corresponding the first original chrominance values C1 (t) of weighted value W, original target pixel data P (t) therewith a little the second original chrominance values C2 (t), a TI carrier chrominance signal C1 ' (t) and the 2nd TI carrier chrominance signal C2 ' (t), output one first adjust after carrier chrominance signal CP1 (t) and one second adjust after carrier chrominance signal CP2 (t).For example; color protection circuit 104 compares corresponding original target pixel data P (15) TI carrier chrominance signal C1 ' (15) and the 2nd TI carrier chrominance signal C2 ' (15) with second original chrominance values C2 (0) ~ C2 (30) with first original chrominance values C1 (0) ~ C1 (30) of raw pixel data P (0) ~ P (30) respectively one by one, to produce accordingly weighted value W.Weighted value W is in order to represent the trusting degree to a signal, as long as higher to the trusting degree of a signal, this signal is more similar to the signal of final output.For example, as a TI carrier chrominance signal C1 ', (t) corresponding weighted value W is larger and have higher trusting degree, (t) to account for after the first adjustment the ratio of carrier chrominance signal CP1 (t) higher for a TI carrier chrominance signal C1 ', makes a TI carrier chrominance signal C1 ' (t) get over similar to carrier chrominance signal CP1 (t) after first adjusts.But the present embodiment is not limited to this, the export ratio that weighted value W not necessarily will be shared with signal is directly proportional, and weighted value W is as long as can reflect trust or the distrust degree to a signal.

On the other hand, image processing apparatus 100 also can comprise a data control circuit 106, in order to extract the pixel data of a window area of a picture data I, to export transient improvement circuit 102 and color protection circuit 104 to as this little raw pixel data P (0) ~ P (N), the present embodiment is to export this little raw pixel data P (0) ~ P (N) to transient improvement circuit 102, and export first and second original chrominance values C1 (0) ~ C1 (N) of this little raw pixel data P (0) ~ P (N), C2 (0) ~ C2 (N) explains for example to color protection circuit 104.Window area for example can define according to the corresponding object pixel of original target pixel data.For instance, if object pixel is P (15), window area may be defined as: centered by object pixel P (15), respectively extend to the left and right sides 15 pixel regions that pixel forms.Thus, window area represents the pixel column of size for 1X31, and pixel column has for example comprised pixel P (0) ~ P (30).In another embodiment, window area also can be the pixel column of fixed size.Data control circuit 106 further exports many raw pixel data P (the 0) ~ P (30) corresponding to pixel P (0) ~ P (30) to transient improvement circuit 102 and color protection circuit 104.Certainly, above-mentioned window area also can define according to different modes, does not illustrate and is limited with this.And the size of window area also can adjust according to the resolution of display.For instance, when the resolution of display is higher, corresponding window area is larger; Otherwise when the resolution of display is lower, corresponding window area is less.

Transient improvement circuit 102 for example comprises a brightness improving device 108, one first colourity improves device 110 and one second colourity is improved device 112.Brightness improving device 108 is in order to carry out transient improvement processing to original luminance signal Y (t), to export TI brightness signal Y ' (t).TI brightness signal Y ' (t) for example correspond to the luminance component Y in YCbCr color space.The first colourity is improved device 110 in order to the first original chrominance values C1 (t) is carried out to transient improvement processing, to export a TI carrier chrominance signal C1 ' (t) to color protection circuit 104.The second colourity is improved device 112 in order to the second original chrominance values C2 (t) is carried out to transient improvement processing, to export the 2nd TI carrier chrominance signal C2 ' (t) to color protection circuit 104.Above-mentioned first and second TI carrier chrominance signal C1 ', C2 ' for example correspond to respectively chromatic component Cb and Cr in YCbCr color space.

Please refer to Fig. 3, Fig. 3 illustrates the schematic diagram of above-mentioned transient improvement processing.Curve 302 represents the curve that many corresponding pixel values of raw pixel data (hereinafter to be referred as original pixel value) change with picture position.Curve 304 represents the curve that many corresponding pixel values of TI pixel data (hereinafter to be referred as TI pixel value) change with picture position.Pixel value is for example luminance component Y, chromatic component Cb or chromatic component Cr.And picture position is for example the location of pixels of arranging along a direction.From the variation of curve 302, when being positioned at image border place, original pixel value, because changing compared with slow and have wider transition width TW1 with picture position, so will make visually to produce the impression of fuzzy edge.For example, and transient improvement processing is the original pixel value that is positioned at image border place to be adjusted to (adjusting original pixel value along the direction shown in dotted arrow), the original pixel value (TI pixel value) after adjustment is as shown in curve 304.The TI pixel value obtaining has shorter transition width TW2 with the variation of picture position, therefore can reach the visually effect of sharp keenization of image border.

Refer again to Fig. 1 and Fig. 2, color protection circuit 104 for example comprises Difference test device 202, weights corresponder 204 and blender 206.Difference test device 202 is in order to detect the corresponding TI carrier chrominance signal C1 ' of original target pixel data P (t) (t) and (t) these a little first original chrominance values C1 (0) ~ C1 (N) multiple difference value between a little second original chrominance values C2 (0) ~ C2 (N) therewith of a little raw pixel data P (0) ~ P (N) therewith respectively of the 2nd TI carrier chrominance signal C2 ', and exports a color difference signal CD (t) according to these a little difference value.

Weights corresponder 204 is in order to according to heterochromia signal CD (t), a weight table LUT is tabled look-up, to export weighted value W (t).Weight table LUT has for example comprised the information of the weighted value W (t) that each different color difference signal CD (t) is corresponding with it, make weights corresponder 204 can by search weight table LUT with output the weighted value W (t) corresponding to heterochromia signal CD (t).But the present embodiment is not limited to this, weights corresponder 204 also can not draw weighted value W (t) by the mode of tabling look-up, as long as weights corresponder 204 can produce the weighted value W (t) corresponding with heterochromia signal CD (t).

Blender 206 is in order to receive weighted value W (t), the first original chrominance values C1 (t) of original target pixel data P (t), the second original chrominance values C2 (t) of original target pixel data P (t), the corresponding TI carrier chrominance signal C1 ' of original target pixel data (t), and corresponding the 2nd TI carrier chrominance signal C2 ' of original target pixel data (t), and according to weighted value W (t) mix original target pixel data P (t) the first original chrominance values C1 (t) and the corresponding TI carrier chrominance signal C1 ' of original target pixel data P (t) (t), to export carrier chrominance signal CP1 (t) after the first adjustment, and mix the second original chrominance values C2 (t) of original target pixel data P (t) and corresponding the 2nd TI carrier chrominance signal C2 ' of original target pixel data P (t) (t) according to weighted value W (t), to export accordingly carrier chrominance signal CP2 (t) after the second adjustment.Above-mentioned signal mixing for example can be drawn by following formula:

S=S1(α)+S2(1-α)

Wherein, S represents mixed signal, and S1 and S2 represent respectively the signal that wish is mixed, and α represents the weight of the signal of wish mixing.For instance, S represents carrier chrominance signal CP1 (t) after the first adjustment, S1 represents the first original chrominance values C1 (t) of original target pixel data P (t), S2 represents the corresponding TI carrier chrominance signal C1 ' of original target pixel data P (t) (t), and α represents the first corresponding weighted value W of original chrominance values C1 (t) (t).But the present embodiment is not limited to this, that is blender 206 is not limited to mix two signals according to weighted value W (t), as long as the signal that blender 206 is exported can reflect that weighted value W (t) is to wanting the trusting degree of mixed signal.

Please refer to Fig. 4, Fig. 4 illustrates the schematic diagram of an example of Difference test device 202 in the color protection circuit 104 of Fig. 2.Difference test device 202 comprises difference computational unit 402 and chooses unit 404.Difference computational unit 402 in order to by corresponding original target pixel data P (t) TI carrier chrominance signal C1 ' (t) therewith these a little first original chrominance values C1 (0) ~ C1 (N) of a little raw pixel data P (0) ~ P (N) subtract each other respectively, and by corresponding original target pixel data P (t) the 2nd TI carrier chrominance signal C2 ' (t) therewith these a little second original chrominance values C2 (0) ~ C2 (N) of a little raw pixel data P (0) ~ P (N) subtract each other respectively, and correspondence so far a little raw pixel data P (0) ~ P (N) subtract each other result and, produce so far this little difference value D (0) ~ D (N) of a little original target pixel data P (0) ~ P (N) of correspondence respectively.

Above-mentioned that subtract each other result and for example can be drawn by following formula:

D(i)=|diff_C1(i)+|diff_C2(i)|

Wherein, the result that parameter d iff_C1 (i) represents the corresponding TI carrier chrominance signal C1 ' of original target pixel data P (t) (t) and the first original chrominance values C1 (i) of raw pixel data P (i) subtracts each other rear gained; The result that parameter d iff_C2 (i) represents corresponding the 2nd TI carrier chrominance signal C2 ' of original target pixel data P (t) (t) and the second original chrominance values C2 (i) of raw pixel data P (i) subtracts each other rear gained.But the present embodiment is as limit, every do according to parameter d iff_C1 and parameter d iff_C2 linear or the difference value that nonlinear combination produces, neither depart from the spirit and scope of the embodiment of the present invention.

Choose unit 404 in order to a minimum value of choosing this little difference value D (0) ~ D (N) in a little difference value D (0) ~ D (N) from then on as heterochromia signal CD (t).For example, when difference value D (10) the middle minimum value of a little difference value D (0) ~ D (N) for this reason, selection differences value D (10) is as heterochromia signal CD (t).And the corresponding size of heterochromia signal CD (t) for example can be quantified as heterochromia amount CDiff (t) do represent.

In addition, choosing unit 404 more can be according to a control signal CTL to select a part of this little difference value D (0) ~ D (N) as the sample that judges minimum value.For example, choosing unit 404 can be according to control signal CTL to select a part of D (10) ~ D (N-10) of this little difference value D (0) ~ D (N) as the sample that judges minimum value, and from then in a little difference value D (10) ~ D (N-10), chooses a reckling as heterochromia signal CD (t).Thus, choose unit 404 does not just need all to make comparisons to select reckling for all difference value at every turn.So not only lower the computational burden of choosing unit 404, also can reduce its manufacturing cost.

Please refer to Fig. 5, it is the corresponding relation figure of weighted value W (t) and the corresponding heterochromia amount of heterochromia signal CD CDiff that Fig. 5 illustrates.In Fig. 5, when heterochromia amount, CDiff is increased to TRH by TRL, and weighted value W (t) is increased to Wup by 0 linearly.But the present embodiment is not as limit, weighted value W (t) can be also nonlinear with the variation of heterochromia amount CDiff, and weighted value W (t) must not be defined in when heterochromia amount CDiff drops on [TRL, TRH] interval and just change.Owing to working as, the corresponding heterochromia amount of heterochromia signal CD CDiff is larger, represent that first and second original chrominance values C1 (t), C2 (t) are larger with the pixel data differences of window area, also represent that TI pixel data is more likely wrong color; Therefore under this situation, original target pixel data are endowed higher weights, namely higher trusting degree.Otherwise, when the corresponding heterochromia amount of heterochromia signal CD (t), CDiff is less, represent that first and second original chrominance values C1 (t), C2 (t) are less with the pixel data differences of window area, also represent that TI pixel data may be more correct; Therefore under this situation, original target pixel data P (t) is relatively endowed lower weight.

Referring to Fig. 6, it is the schematic diagram of an example of blender 206 in the color protection circuit 104 of Fig. 2 that Fig. 6 illustrates.Blender 206 comprises one first mixed cell 602 and one second mixed cell 604.The first mixed cell 602 is in order to mix original target pixel data P (t) corresponding TI carrier chrominance signal C1 ' (t) and the first original chrominance values C1 (t) of original target pixel data P (t) according to weighted value W (t), to export carrier chrominance signal CP1 (t) after the first adjustment.The second mixed cell 604 is in order to mix original target pixel data P (t) corresponding the 2nd TI carrier chrominance signal C2 ' (t) and the second original chrominance values C2 (t) of original target pixel data P (t) according to weighted value W (t), to export carrier chrominance signal CP2 (t) after the second adjustment.

Because weighted value W (t) is in order to represent the trusting degree to a signal, therefore, when heterochromia signal CD (t) corresponding heterochromia amount CDiff (t) is larger, weighted value W (t) makes the corresponding mixed proportion of original target pixel data P (t) (being for example the first or second original chrominance values C1 (t), the C2 (t) of original target pixel data P (t)) higher.When heterochromia signal CD (t) corresponding heterochromia amount CDiff (t) less, weighted value W (t) make TI pixel data (for example for original target pixel data P (t) corresponding first or the 2nd TI carrier chrominance signal C1 ' (t), C2 ' (t)) corresponding mixed proportion is higher.Thus; if while there is the situation of color mistake in original target pixel data P (t) after transient state is improved; the degree that color protection circuit 104 can depart from according to color and adjust accordingly TI pixel data, makes the TI pixel data after adjusting similar to original target pixel data P (t).Because the color of original target pixel data P (t) can be considered to be correctly, therefore above-mentioned adjustment can be avoided the generation of color mistake.

Please refer to Fig. 7, the color protection circuit 104 of the embodiment of the present invention more can comprise upper limit setting apparatus 702.Upper limit setting apparatus 702 is coupled to blender 206, and sets a higher limit Wup ' of weighted value W (t) according to an external signal Ex.

Please refer to Fig. 8, Fig. 8 illustrates the schematic diagram of an example of the upper limit setting apparatus 702 that is Fig. 7.In Fig. 8, upper limit setting apparatus 802, after receiving the corresponding original higher limit Wup of weighted value W (t) and external signal Ex, selects a smaller of original higher limit Wup and external signal Ex as the higher limit Wup ' of weighted value.External signal Ex for example deducts a set point Sv for original higher limit Wup.For instance, if the corresponding original higher limit Wup=1 of weighted value W (t), as input one set point Sv=0.2, external signal Ex is Wup-Sv=0.8, upper limit setting apparatus 802 is selected original higher limit Wup(=1) with external signal Ex(Wup-Sv=0.8) a smaller as the higher limit Wup ' of new weighted value W (t), the higher limit that makes weighted value W (t) by originally 1 be reduced to 0.8.But the present embodiment is not limited to this, the every circuit that can set according to external signal Ex the higher limit Wup of weighted value W, all can be used as the upper limit setting apparatus 802 of the present embodiment.

The present embodiment more proposes a kind of image processing method, and image processing method is for the image processing apparatus 100 of the embodiment of the present invention.Please refer to Fig. 9, it illustrates the flow chart of the image processing method that is the present embodiment.The method comprises step 902,904,906 and 908.In step 902, receive many raw pixel data P (0) ~ P (N), this a little raw pixel data P (0) ~ P (N) comprises an original target pixel data P (t), every raw pixel data comprise an original luminance signal Y (i), one first original chrominance values C1 (i), with one second original chrominance values C2 (i).

In step 904, these original target pixel data P (t) are carried out to transient improvement processing, with output, corresponding to a TI pixel data of original target pixel data P (t), TI pixel data comprises a TI brightness signal Y ' (t), one the one TI carrier chrominance signal C1 ' (t), with one the 2nd TI carrier chrominance signal C2 ' (t).

In step 906, that corresponding original target pixel data P (t) TI carrier chrominance signal C1 ' (t) is compared one by one with first original chrominance values C1 (0) ~ C1 (N) of raw pixel data P (0) ~ P (N), and the 2nd TI carrier chrominance signal C2 ' (t) is compared one by one with second original chrominance values C2 (0) ~ C2 (N) of raw pixel data P (0) ~ P (N), to produce accordingly a weighted value W (t).

In step 908, according to corresponding the first original chrominance values C1 (t) of weighted value W (t), original target pixel data P (t) and the second original chrominance values C2 (t), a TI carrier chrominance signal C1 ' (t) and the 2nd TI carrier chrominance signal C2 ' (t), output one first adjust after carrier chrominance signal CP1 (t) and one second adjust after carrier chrominance signal CP2 (t).

A kind of use of the present embodiment is so that the image processing apparatus of the clear-cut margin of image and method thereof, and the color Problem-Error that can effectively avoid traditional transient improvement technology to produce, to improve the correctness of transient improvement technology.

In sum, although the present invention with embodiment openly as above, so it is not in order to limit the present invention.Those skilled in the art without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on appended claims confining spectrum.

Claims (21)

1. an image processing apparatus, with so that sharp keenization of edge (edge boundary) of image, this image processing apparatus comprises:
One transient improvement (Transient Improvement, TI) circuit, in order to receive complex raw pixel data, these raw pixel data comprise original target pixel data, every raw pixel data comprises an original luminance signal, one first original colourity (chroma) signal, with one second original chrominance values, this transient improvement circuit also carries out transient improvement processing to these original target pixel data, a TI pixel data with output corresponding to these original target pixel data, this TI pixel data comprises a TI luminance signal, one the one TI carrier chrominance signal, with one the 2nd TI carrier chrominance signal, and
One color protective circuit, in order to these first original chrominance values of a TI carrier chrominance signal and these raw pixel data are compared one by one, and these second original chrominance values of the 2nd TI carrier chrominance signal and these raw pixel data are compared one by one, to produce accordingly a weighted value, and according to this weighted value, corresponding this first original chrominance values of these original target pixel data and this second original chrominance values, the one TI carrier chrominance signal and the 2nd TI carrier chrominance signal, export one first and adjust rear carrier chrominance signal and the rear carrier chrominance signal of one second adjustment.
2. image processing apparatus as claimed in claim 1, wherein this transient improvement circuit comprises:
One brightness improving device, carries out transient improvement processing in order to this original luminance signal to these original target pixel data, to export this TI luminance signal;
One first colourity is improved device, carries out transient improvement processing in order to this first original chrominance values to these original target pixel data, to export a TI carrier chrominance signal to this color protection circuit; And
One second colourity is improved device, carries out transient improvement processing in order to this second original chrominance values to these original target pixel data, to export the 2nd TI carrier chrominance signal to this color protection circuit.
3. image processing apparatus as claimed in claim 1, wherein the color space of these raw pixel data is YCbCr color space or YUV color space.
4. image processing apparatus as claimed in claim 1, wherein this color protection circuit comprises:
One Difference test device, in order to detect a TI carrier chrominance signal and the 2nd TI carrier chrominance signal respectively and these first original chrominance values and these second original chrominance values of these raw pixel data between multiple difference value, and export a color difference signal according to these difference value;
One weights corresponder, in order to according to this heterochromia signal, one weight table is tabled look-up, to export this weighted value; And
One blender, in order to receive this weighted value, this first original chrominance values of these original target pixel data, this second original chrominance values of these original target pixel data, the one TI carrier chrominance signal, and the 2nd TI carrier chrominance signal, and mix this first original chrominance values and a TI carrier chrominance signal of these original target pixel data according to this weighted value, to export the rear carrier chrominance signal of this first adjustment, and mix this second original chrominance values and the 2nd TI carrier chrominance signal of these original target pixel data according to this weighted value, to export accordingly the rear carrier chrominance signal of this second adjustment.
5. image processing apparatus as claimed in claim 4, wherein this Difference test device comprises:
One difference computational unit, in order to these first original chrominance values of a TI carrier chrominance signal and these raw pixel data are subtracted each other respectively, and these second original chrominance values of the 2nd TI carrier chrominance signal and these raw pixel data are subtracted each other respectively, and according to correspond to these raw pixel data subtract each other result and, produce and correspond to respectively these difference value of this original target pixel data; And
One chooses unit, in order to a minimum value of choosing these difference value from these difference value as this heterochromia signal.
6. image processing apparatus as claimed in claim 4, wherein when the corresponding heterochromia amount of this heterochromia signal is larger, this weighted value makes the corresponding mixed proportion of these original target pixel data higher, when the corresponding heterochromia amount of this heterochromia signal is less, this weighted value makes the corresponding mixed proportion of this TI pixel data higher.
7. image processing apparatus as claimed in claim 4, wherein this blender comprises:
One first mixed cell, in order to mix this first original chrominance values of a TI carrier chrominance signal and these original target pixel data according to this weighted value, to export the rear carrier chrominance signal of this first adjustment; And
One second mixed cell, in order to mix this second original chrominance values of the 2nd TI carrier chrominance signal and these original target pixel data according to this weighted value, to export the rear carrier chrominance signal of this second adjustment.
8. image processing apparatus as claimed in claim 4, wherein this color protection circuit also comprises:
One upper limit setting apparatus, is coupled to this blender, and this upper limit setting apparatus is set a higher limit of this weighted value according to an external signal.
9. image processing apparatus as claimed in claim 8, wherein this upper limit setting apparatus, after receiving the corresponding original higher limit of this weighted value and this external signal, selects a smaller of this original higher limit and this external signal as this higher limit of this weighted value.
10. image processing apparatus as claimed in claim 1, also comprises:
One data control circuit, in order to extract the pixel data of a window area of a picture data, to export this transient improvement circuit and this color protection circuit to as these raw pixel data.
11. 1 kinds of image processing methods, with so that the clear-cut margin of image, this image processing method comprises:
Receive complex raw pixel data, these raw pixel data comprise original target pixel data, every raw pixel data comprise an original luminance signal, one first original chrominance values, with one second original chrominance values;
These original target pixel data are carried out to transient improvement processing, to export the TI pixel data corresponding to these original target pixel data, this TI pixel data comprise a TI luminance signal, one the one TI carrier chrominance signal, with one the 2nd TI carrier chrominance signal;
These first original chrominance values of the one TI carrier chrominance signal and these raw pixel data are compared one by one, and these second original chrominance values of the 2nd TI carrier chrominance signal and these raw pixel data are compared one by one, to produce accordingly a weighted value; And
According to this weighted value, corresponding this first original chrominance values of these original target pixel data and this second original chrominance values, a TI carrier chrominance signal and the 2nd TI carrier chrominance signal, output one first is adjusted rear carrier chrominance signal and one second and is adjusted rear carrier chrominance signal.
12. image processing methods as claimed in claim 11, wherein this step that these original target pixel data are carried out to transient improvement processing comprises:
This original luminance signal to these original target pixel data is carried out transient improvement processing, to produce this TI luminance signal;
This first original chrominance values to these original target pixel data is carried out transient improvement processing, to export a TI carrier chrominance signal; And
This second original chrominance values to these original target pixel data is carried out transient improvement processing, to export the 2nd TI carrier chrominance signal.
13. image processing methods as claimed in claim 11, wherein the color space of these raw pixel data is YCbCr color space or YUV color space.
14. image processing methods as claimed in claim 11, wherein the step of this generation weighted value comprises:
The multiple difference value that detect a TI carrier chrominance signal and the 2nd TI carrier chrominance signal respectively and between these first original chrominance values and these second original chrominance values of these raw pixel data, and export a color difference signal according to these difference value; And
According to this heterochromia signal, one weight table is tabled look-up, to export this weighted value.
15. image processing methods as claimed in claim 14, wherein this first step of adjusting rear carrier chrominance signal and the rear carrier chrominance signal of this second adjustment of this output comprises:
Receive this first original chrominance values of this weighted value, these original target pixel data, this second original chrominance values, a TI carrier chrominance signal and the 2nd TI carrier chrominance signal of these original target pixel data;
Mix this first original chrominance values and a TI carrier chrominance signal of these original target pixel data according to this weighted value, to export the rear carrier chrominance signal of this first adjustment; And
Mix this second original chrominance values and the 2nd TI carrier chrominance signal of these original target pixel data according to this weighted value, to export accordingly the rear carrier chrominance signal of this second adjustment.
16. image processing methods as claimed in claim 14, wherein the step of this heterochromia signal of this output comprises:
These first original chrominance values of the one TI carrier chrominance signal and these raw pixel data are subtracted each other respectively, and these second original chrominance values of the 2nd TI carrier chrominance signal and these raw pixel data are subtracted each other respectively;
According to correspond to these raw pixel data subtract each other result and, produce and correspond to respectively these difference value of this original target pixel data; And
From these difference value, choose a minimum value of these difference value as this heterochromia signal.
17. image processing methods as claimed in claim 14, wherein when the corresponding heterochromia amount of this heterochromia signal is larger, this weighted value makes the corresponding mixed proportion of these original target pixel data higher, when the corresponding heterochromia amount of this heterochromia signal is less, this weighted value makes the corresponding mixed proportion of this TI pixel data higher.
18. image processing methods as claimed in claim 14, wherein this first step of adjusting rear carrier chrominance signal and the rear carrier chrominance signal of this second adjustment of this output comprises:
Mix this first original chrominance values of a TI carrier chrominance signal and these original target pixel data according to this weighted value, to export the rear carrier chrominance signal of this first adjustment; And
Mix this second original chrominance values of the 2nd TI carrier chrominance signal and these original target pixel data according to this weighted value, to export the rear carrier chrominance signal of this second adjustment.
19. image processing methods as claimed in claim 14, also comprise:
Set a higher limit of this weighted value according to an external signal.
20. image processing methods as claimed in claim 19, wherein the step of this higher limit of this this weighted value of setting comprises:
Receiving after the corresponding original higher limit of this weighted value and this external signal, select a smaller of this original higher limit and this external signal as this higher limit of this weighted value.
21. image processing methods as claimed in claim 11, also comprise:
Extract the pixel data of a window area of a picture data, using as these raw pixel data.
CN201210539911.2A 2012-12-13 2012-12-13 Image processing apparatus and method thereof CN103873839A (en)

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Application publication date: 20140618