CN101779221A - Method and device for improving chrominance sharpness - Google Patents
Method and device for improving chrominance sharpness Download PDFInfo
- Publication number
- CN101779221A CN101779221A CN200880103133.4A CN200880103133A CN101779221A CN 101779221 A CN101779221 A CN 101779221A CN 200880103133 A CN200880103133 A CN 200880103133A CN 101779221 A CN101779221 A CN 101779221A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000001228 spectrum Methods 0.000 claims abstract description 8
- 230000007704 transition Effects 0.000 claims description 13
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 230000001052 transient effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 11
- 101000760663 Hololena curta Mu-agatoxin-Hc1a Proteins 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012887 quadratic function Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/73—Deblurring; Sharpening
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10016—Video; Image sequence
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10024—Color image
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20172—Image enhancement details
- G06T2207/20192—Edge enhancement; Edge preservation
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Processing Of Color Television Signals (AREA)
- Picture Signal Circuits (AREA)
Abstract
The invention relates to a method and an electronic device for improving chrominance sharpness of an incoming signal (11), wherein the signal is split into its frequency spectrum components (12), the filtered signal is amplified (14) according to the steepness of the incoming edge of the signal and the amplified signals are clipped on a predetermined range of the transient (15).
Description
Technical field
The present invention relates to a kind of method and a kind of electronic equipment that makes in this way that improves chrominance sharpness.
Background technology
Because the new technology in field of computer technology and the field of data transmission is growing to the use of image and vision signal.Therefore, the quality of such image or video data is extremely important for accepting new technology or new product.In order to improve the subjective impression acutance of image and video number, peaking (peaking) is a kind of known linear method.This peaking technique only is exclusively used in luminance signal.In this territory, set up the improved nonlinear method of transition (being called LTI) well, and this method has benefited from the non-linear adaptive of peaking principle.Corresponding method in the colourity territory is that the colourity transition improves (CTI), and its numeral realizes designing according to its simulation.
Begin to have carried out multiple improvement from this moment, yet have many shortcomings can't solve acceptable degree, as the sensitivity of this design noise and shake.In addition, the new display with high definition resolution need a kind of permission use the Video processing of CTI to conceive after convergent-divergent is handled.
EP 0805603A1 discloses such CTI method, wherein, creates and handle three signals, and equipment is created the intermediate value of these three signals of creating simultaneously.
In addition, US 6,909, and 813B2 discloses a kind of contour correction circuit and a kind of contour correction method.
Summary of the invention
The objective of the invention is to improve chrominance sharpness, under the prerequisite that does not have extra very high cost, realize this improvement simultaneously.
The problems referred to above are to carry out improved method by a kind of chrominance sharpness to input signal to solve, wherein, the spectrum component that signal is divided into signal, steepness according to signal input edge is amplified filtered signal, and on the predetermined transition scope signal after amplifying is being carried out slicing.This method allows to improve chrominance sharpness, can carry out separately each component of input signal simultaneously and independently processing mutually, and signal content not produced any interference.
According to another embodiment of the invention, this method also comprises: use the color ribbon bandpass filter to select each frequency of input signal.
According to another embodiment of the invention, advantageously, use the gain and the maximum gain more than predetermined steepness value of the following fixed gain of predetermined steepness, linear increase with the increase of steepness, come signal is carried out the amplification that depends on steepness.Yet, more advantageously, can use another function to replace linear relationship between steepness and the gain, for example quadratic function or nonlinear function.
The present invention's purpose relevant with realizing above-mentioned improved equipment is to utilize a kind of electronic equipment that is used to improve the chrominance sharpness of input signal to solve, wherein, this equipment comprises the color ribbon bandpass filter that is used for signal is divided into the spectrum component of signal, also comprises being used for the amplifier that filtered signal is amplified according to the steepness at signal input edge and being used at the slicing equipment that on the predetermined transition scope signal after amplifying is carried out slicing.
According to embodiments of the invention, highly beneficial ground, this equipment is realized on electronic microchip.
In addition, advantageously, described at least wave filter is implemented as the software product in the microchip.
Description of drawings
By below with reference to the accompanying drawing description of illustrated embodiments of the invention, above-mentioned and other feature and advantage of the present invention will become apparent, in the accompanying drawing:
Fig. 1 shows block diagram;
Fig. 2 shows block diagram;
Fig. 3 shows synoptic diagram; And
Fig. 4 shows synoptic diagram.
Embodiment
Fig. 1 shows the block diagram 1 of explanation peaking process.Peaking is a kind of linear method, means additional frequency to be added in the signal spectrum of input signal 2.Peaking mainly is made of the linear filter 3 as HP wave filter and so on, and linear filter 3 improves the centre or the higher frequency part of input signal 2 frequency spectrums of input signal, to create output signal 4.
Peaking is a kind of known method that improves the subjective impression acutance of image and vision signal 2.Usually, peaking only is exclusively used in luminance signal.In this territory, even set up the improved nonlinear method of transition well, be called LTI.LTI has benefited from the non-linear adaptive of peaking principle.Corresponding method in the colourity territory is that so-called colourity transition improves (CTI), and its numeral designs according to its simulation predecessor.Begin to have carried out multiple improvement from this moment, but many shortcomings of this design are insurmountable, as sensitivity to noise and shake.
As the result that frequency-selective improves, introduce or amplified so-called overshoot and Xia Chong, no matter whether they appear in this signal.
In addition, nonlinear method can add non-existent new frequency component in the original incoming video signal.The better example of nonlinear method is that the colourity transition improves (CTI).
The advantage that the CTI design of the present invention that is proposed surpasses traditional CT I is, does not need to determine edge center.Determining of edge center is critical process, especially under noise conditions, and subpixel accuracy that need be in discrete domain.
In order to distinguish traditional CT I and new CTI based on peaking, add " p " that represents peaking in the front of the improved abbreviation of colourity transition, obtain " pCTI ".I is designated as DCTI with traditional CT, and wherein D represents numeral.
The block diagram 10 of Fig. 2 shows the handling principle of the method for the present invention that is called pCTI.Handle each component of carrier chrominance signal independently of each other.(CBPF) 12 is divided into its spectrum component with input signal 11 by the color ribbon bandpass filter.
Utilize amplifier 14, filtered signal 13 is amplified, wherein in module 16, module 14 is analyzed and be fed to the steepness at described input edge according to the steepness at input edge.This processing mode allows to get rid of the transition (usually typically at noise) that has more by a small margin.According to processing sequence, next step is a slicing routine 15, slicing routine 15 is carried out slicing to signal on predetermined minimum (Min) and maximum (Max) transition level, wherein said minimum (Min) and maximum (Max) transition level are determined by module 17.
Figure 3 illustrates amplitude characteristic, wherein represented two different CBPF wave filters as the function of the frequency of above-mentioned color ribbon bandpass filter.The line of signal Figure 20 or curve 21 expressions are called the CBPF of SD/HD, and line or curve 22 expressions are called the 2nd CBPF of SD/SD HD/HD.As from the synoptic diagram of Fig. 3 as can be seen, the characteristic frequency of first wave filter (line 21) almost is positioned at the position than the characteristic frequency low 1/2nd of second wave filter (line 22).
Under the situation of these two wave filter cascades, these two wave filters can be controlled separately by its gain.Fig. 4 shows the signal Figure 25 as the gain of the function of steepness.Line or curve 26 are worth 27 from constant certain gain to begin, till reaching predetermined steepness value 29.Between steepness value 29 and 30, gain will improve, and after reaching predetermined steepness value 30, gain will be constant at maximum gain level 28 places.
Reference number
1 block diagram
2 input signals
3 wave filters
4 output signals
10 block diagrams
11 input signals
12 color ribbon bandpass filters
13 filtered signals
14 amplifiers
15 slicing equipment or routines
16 are used for equipment that the steepness of input signal is analyzed
17 are used for input signal is carried out the module of slicing
20 synoptic diagram
21 lines/curve
22 lines/curve
25 synoptic diagram
26 lines/curve
27 gains
28 gain levels
29 predetermined steepness values
30 predetermined steepness values
Claims (7)
1. method that is used to improve the chrominance sharpness of input signal (11), wherein, signal (11) is divided into the signal spectrum component, steepness according to the input edge of signal comes filtered signal is amplified (14), and on the predetermined transition scope signal after amplifying is being carried out slicing (15).
2. the method that is used to improve chrominance sharpness according to claim 1 also comprises: use color ribbon bandpass filter (12) to select each frequency of input signal.
3. method according to claim 1 wherein, is used gain and the maximum gain more than predetermined steepness value in the fixed gain below the predetermined steepness, the linear increase along with the increase of steepness, comes signal is carried out the amplification that depends on steepness.
4. method according to claim 3, wherein, use another function replace steepness and the gain between linear relationship.
5. electronic equipment that is used to improve the chrominance sharpness of input signal, wherein, described equipment comprises: color ribbon bandpass filter (12) is used for signal is divided into the spectrum component of signal; Also comprise: amplifier (14) is used for coming filtered signal is amplified according to the steepness at the input edge of signal; And slicing equipment (15), be used on the predetermined transition scope signal after amplifying being carried out slicing.
6. equipment according to claim 5, wherein, described equipment is realized in electronic microchip.
7. equipment according to claim 5, wherein, described at least wave filter is implemented as the software product in the microchip.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07114583 | 2007-08-20 | ||
| EP07114583.3 | 2007-08-20 | ||
| PCT/IB2008/053179 WO2009024885A2 (en) | 2007-08-20 | 2008-08-07 | Method and device for improving chrominance sharpness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101779221A true CN101779221A (en) | 2010-07-14 |
| CN101779221B CN101779221B (en) | 2012-10-03 |
Family
ID=40378759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880103133.4A Expired - Fee Related CN101779221B (en) | 2007-08-20 | 2008-08-07 | Method and device for improving chrominance sharpness |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2188775A2 (en) |
| CN (1) | CN101779221B (en) |
| WO (1) | WO2009024885A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105809644A (en) * | 2016-03-15 | 2016-07-27 | 深圳英飞拓科技股份有限公司 | Image edge false color inhabitation method and apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8805114B2 (en) * | 2012-11-27 | 2014-08-12 | Texas Instruments Incorporated | Content adaptive edge and detail enhancement for image and video processing |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5920357A (en) * | 1996-01-11 | 1999-07-06 | Texas Instruments Incorporated | Digital color transient improvement |
| US7271851B2 (en) * | 2003-01-16 | 2007-09-18 | Samsung Electronics Co., Ltd. | Adaptive color transient improvement |
| SG115540A1 (en) * | 2003-05-17 | 2005-10-28 | St Microelectronics Asia | An edge enhancement process and system |
| US7454081B2 (en) * | 2004-01-30 | 2008-11-18 | Broadcom Corporation | Method and system for video edge enhancement |
| US7653257B2 (en) * | 2005-07-19 | 2010-01-26 | Intel Corporation | Enhancing video sequence sharpness by adaptive peaking |
| KR100757731B1 (en) * | 2006-02-16 | 2007-09-11 | 삼성전자주식회사 | Method for adaptive image signal transient improvement, and image quality improvement device for the same |
-
2008
- 2008-08-07 EP EP08807264A patent/EP2188775A2/en not_active Withdrawn
- 2008-08-07 CN CN200880103133.4A patent/CN101779221B/en not_active Expired - Fee Related
- 2008-08-07 WO PCT/IB2008/053179 patent/WO2009024885A2/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105809644A (en) * | 2016-03-15 | 2016-07-27 | 深圳英飞拓科技股份有限公司 | Image edge false color inhabitation method and apparatus |
| CN105809644B (en) * | 2016-03-15 | 2018-05-15 | 深圳英飞拓科技股份有限公司 | Image border fake color inhibition method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009024885A3 (en) | 2009-06-25 |
| EP2188775A2 (en) | 2010-05-26 |
| CN101779221B (en) | 2012-10-03 |
| WO2009024885A2 (en) | 2009-02-26 |
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