CN101389040B - Image sharpness regulating method and apparatus - Google Patents
Image sharpness regulating method and apparatus Download PDFInfo
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- CN101389040B CN101389040B CN2007101521735A CN200710152173A CN101389040B CN 101389040 B CN101389040 B CN 101389040B CN 2007101521735 A CN2007101521735 A CN 2007101521735A CN 200710152173 A CN200710152173 A CN 200710152173A CN 101389040 B CN101389040 B CN 101389040B
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Abstract
This invention discloses an image sharpness regulator, including a table checking circuit for generating a set of color marks based on an input color signal; a color sharpness plus multi-task machine coupled to the table checking circuit and used for generating a set of first color sharpness pluses based on the set of color marks and several color sharpness setting values, wherein each sharpness setting value is aimed to a specified color; an interpolation circuit for processing interpolation operation based on the input color signal and the first color sharpness plus so as to generate a second color sharpness plus; and a brightness regulating unit for regulating a brightness signal based on the second color sharpness plug.
Description
Technical field
The present invention relates to a kind of image sharpness control method and device, particularly relate to a kind of relevant for independent image sharpness control method and the device adjusting image sharpness and carry out with lookup table mode.
Background technology
For digital color image, judge the good and bad of digital color image quality usually, except depending on the color saturation of this digital color image, the color sharpness also is a very important index.
In the known technology, though have the method and the device of numerous adjustment image sharpness, in these methods and device, the user only can adjust its sharpness with regard to entire image, and these methods and device also can't allow the user adjust its sharpness at specific color.
So, the present invention proposes a kind of image sharpness regulating method and device, by the independent sharpness gain of adjusting single color in the coloured image, can independently adjust the sharpness of the different color of coloured image according to user's hobby, and then promote the quality of coloured image.
Summary of the invention
The object of the present invention is to provide a kind of image sharpness regulating method,, can independently adjust the sharpness of the different color of coloured image according to user's hobby by the independent sharpness gain of adjusting single color in the coloured image.
Another object of the present invention is to provide a kind of image sharpness adjusting device,, can independently adjust the sharpness of the different color of coloured image according to user's hobby by the independent sharpness gain of adjusting single color in the coloured image
To achieve these goals, the invention provides a kind of image sharpness regulating method, may further comprise the steps: receive an input chrominance signal; According to this input chrominance signal, tabling look-up determines one group of color indicia; According to this group color indicia and several sharpness set points, produce one group of first color sharpness gain, wherein each this sharpness set point is at a specific color; According to this first color sharpness gain and this input chrominance signal, produce the gain of one second color sharpness; And according to this second color sharpness gain adjustment, one luminance signal.
To achieve these goals, the present invention also provides a kind of image sharpness adjusting device, comprising: a lookup table circuit, in order to produce one group of color indicia according to an input chrominance signal; One color sharpness gain multiplexer is coupled to this lookup table circuit, in order to according to this group color indicia and several color sharpness set points, produces one group of first color sharpness gain, and wherein each this sharpness set point is at a specific color; One interpolating circuit in order to according to this input chrominance signal and this first color sharpness gain carrying out interpolative operation, gains to produce one second color sharpness; And a brightness adjustment unit, in order to adjust a luminance signal according to this second color sharpness gain.
From the above mentioned, image sharpness regulating method of the present invention and device allow the user can comply with its inclination, the independent sharpness of adjusting the different color of coloured image, and then the quality of lifting coloured image.
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 an image sharpness adjusting device of the present invention;
Fig. 2 is the brightness adjusting device of image sharpness adjusting device of the present invention;
Fig. 3 is an image sharpness regulating method flow chart of the present invention.
Wherein, Reference numeral:
100: the image sharpness adjusting device
110: lookup table circuit
120: color sharpness gain multiplexer
130: interpolating circuit
140: the brightness adjustment unit
210: edge detector
220: noise suppression circuit
Embodiment
Please refer to Fig. 1, Fig. 1 is the image sharpness adjusting device of preferred embodiment of the present invention.This image sharpness adjusting device 100 comprises a lookup table circuit 110, a color sharpness gain multiplexer 120, an interpolating circuit 130 and a brightness adjustment unit 140.Lookup table circuit 110 is in order to (Cb_in Cr_in) tables look-up and produces one group of color indicia (Flag1 ~ Flag4), this group color indicia is to form in order to the color of expression input chrominance signal according to an input chrominance signal.In actual applications, with eight chrominance signals is example, because the lookup table of corresponding eight chrominance signals needs bigger memory span, therefore the lookup table in the lookup table circuit 110 can design according to chrominance signal highest byte (MSB), for example, then, table look-up according to the highest byte (MSB) of this input chrominance signal again according to the preceding four highest bytes design of eight chrominance signals, saving the required memory span of lookup table circuit 110, and then reduce cost.
Color sharpness gain multiplexer 120 is coupled to lookup table circuit 110, in order to according to this group color indicia Flag1 ~ Flag4 and several color sharpness set points Set_R ~ Set_O, produces one group of first color sharpness gain Flag1_set ~ Flag4_set.Wherein R, G ..., O represent respectively red (red), green (green) ... and other color of wanting (other colors).Each color sharpness set point is at a specific color, and for example Set_R is the sharpness set point at redness, when the value that the user adjusts Set_R, is promptly adjusting red sharpness.
Interpolating circuit 130 is coupled to color sharpness gain multiplexer 120, organize first color sharpness gain Flag1_set ~ Flag4_set to receive this, and according to this input chrominance signal (Cb_in, Cr_in) lowest byte (LSB), interpolation produce one second color sharpness gain C_gain.In actual applications, if this chrominance signal is eight signals, and lookup table circuit 110 is according to four highest bytes design before the chrominance signal, and then interpolating circuit 130 utilizes four lowest bytes (LSB) of chrominance signal and this to organize the gain of the first color sharpness to carry out interpolation to produce the gain of the second color sharpness.In one embodiment, interpolating circuit 130 can be a bilinear interpolation arithmetic unit.
At last, brightness adjustment unit 140 is adjusted a luminance signal by this second color sharpness gain C_gain.Please refer to Fig. 2, it is for an embodiment schematic diagram of brightness adjustment unit 140.Brightness adjusting device 140 comprises an edge detector 210 and a noise suppression circuit 220.Edge detector 210 receives one brightness signal Y _ in, and gains C_gain to produce a luminance edges value Y_edge according to this second color sharpness.Noise suppression circuit 220 carries out noise suppressed to this brightness signal Y _ in and handles according to this a luminance edges value Y_edge and a critical value, to produce an output luminance signal.Detailed says, when this luminance edges value Y_edge is not more than this critical value, this output luminance signal is this brightness signal Y _ in, as this luminance edges value Y_edge during greater than this critical value, this output luminance signal is the difference that this brightness signal Y _ in adds this luminance edges value and this critical value.In one embodiment, this edge detector 210 comprises a high pass filter, and noise suppression circuit 220 comprises an adder.
Please refer to Fig. 3, Fig. 3 is the flow chart of the image sharpness regulating method of preferred embodiment of the present invention.At first, in step 301, receive an input chrominance signal.
Then, in step 302, by tabling look-up to determine the pairing one group of color indicia of this input chrominance signal.This group color indicia is to form in order to the color of expression input chrominance signal.In actual applications, the lookup table is according to chrominance signal highest byte (MSB) design, and for example preceding four highest bytes according to eight chrominance signals design, then, table look-up according to the highest byte (MSB) of this input chrominance signal again,, and then reduce cost with saving lookup table's memory span.
In step 303, according to this group color indicia and several sharpness set points, produce one group of first color sharpness gain, wherein each this sharpness set point allows the user carry out the setting of sharpness at different color at a specific color.
Then, in step 304, utilize four lowest bytes (LSB) of chrominance signal and this to organize the gain of the first color sharpness and carry out interpolation to produce the gain of the second color sharpness.
At last, in step 305, adjust a luminance signal according to this second color sharpness gain.Adjust in the luminance signal step at this, comprising:, produce a luminance edges value according to this luminance signal and the gain of this second color sharpness; Then,, this luminance signal is carried out noise suppressed handle, to produce an output luminance signal again according to this a luminance edges value and a critical value.Specifically, when this luminance edges value is not more than this critical value, this output luminance signal is this luminance signal, and when this luminance edges value during greater than this critical value, this output luminance signal is the difference that this luminance signal adds this luminance edges value and this critical value.
In sum, the present invention proposes a kind of image sharpness regulating method and device, allows the user can comply with its inclination, the independent sharpness of adjusting the different color of coloured image, and then the quality of lifting coloured image.
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 the appended claim of the present invention.
Claims (9)
1. an image sharpness regulating method is characterized in that, may further comprise the steps:
Receive an input chrominance signal;
According to this input chrominance signal, tabling look-up determines one group of color indicia;
According to this group color indicia and several sharpness set points, produce one group of first color sharpness gain, wherein each this sharpness set point is at a specific color;
According to this first color sharpness gain and this input chrominance signal, produce the gain of one second color sharpness; And
Receive an input luminance signal,, produce a luminance edges value according to this luminance signal and the gain of the second color sharpness; According to this a luminance edges value and a critical value, this luminance signal is carried out noise suppressed handle, to produce an output luminance signal.
2. image sharpness regulating method according to claim 1 is characterized in that, in the step of this group color indicia of decision, tables look-up according to the highest byte of this input chrominance signal.
3. image sharpness regulating method according to claim 2, it is characterized in that, in the step that produces this second color sharpness gain, this second color sharpness gain is to organize the first color sharpness according to the lowest byte of this input chrominance signal and this to gain and carry out that interpolative operation produced.
4. image sharpness regulating method according to claim 3, it is characterized in that, when this luminance edges value is not more than this critical value, this output luminance signal is this luminance signal, when this luminance edges value during greater than this critical value, this output luminance signal is the difference that this luminance signal adds this luminance edges value and this critical value.
5. an image sharpness adjusting device is characterized in that, comprising:
One lookup table circuit is in order to produce one group of color indicia according to an input chrominance signal;
One color sharpness gain multiplexer is coupled to this lookup table circuit, in order to according to this group color indicia and several color sharpness set points, produces one group of first color sharpness gain, and wherein each this sharpness set point is at a specific color;
One interpolating circuit in order to according to this input chrominance signal and this first color sharpness gain carrying out interpolative operation, gains to produce one second color sharpness; And
One brightness adjustment unit in order to receive an input luminance signal, according to this luminance signal and the gain of the second color sharpness, produces a luminance edges value; According to this a luminance edges value and a critical value, this luminance signal is carried out noise suppressed handle, to produce an output luminance signal.
6. image sharpness adjusting device according to claim 5 is characterized in that, this lookup table circuit utilizes the highest byte of this input chrominance signal to table look-up.
7. image sharpness adjusting device according to claim 6 is characterized in that, this interpolating circuit utilizes the lowest byte of this input chrominance signal to carry out interpolative operation.
8. image sharpness adjusting device according to claim 5 is characterized in that, this brightness adjustment unit comprises:
One edge detector is according to this luminance signal and the gain of this second color sharpness, to produce a luminance edges value; And
One noise suppression circuit according to this a luminance edges value and a critical value, carries out noise suppressed to this luminance signal and handles, to produce an output luminance signal.
9. image sharpness adjusting device according to claim 8 is characterized in that this edge detector comprises a high pass filter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101521735A CN101389040B (en) | 2007-09-14 | 2007-09-14 | Image sharpness regulating method and apparatus |
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| CN2007101521735A CN101389040B (en) | 2007-09-14 | 2007-09-14 | Image sharpness regulating method and apparatus |
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| CN101389040A CN101389040A (en) | 2009-03-18 |
| CN101389040B true CN101389040B (en) | 2010-08-18 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6362831B1 (en) * | 1997-11-04 | 2002-03-26 | Winbond Electronics Corp. | Method and apparatus for performing plural matrix multiplication operations using a single coded look-up table |
| CN1549205A (en) * | 2003-05-20 | 2004-11-24 | 矽统科技股份有限公司 | Digital image sharpness and brightness regulating method |
| CN1764282A (en) * | 2004-10-18 | 2006-04-26 | 晨星半导体股份有限公司 | Method and device for independent color management |
| CN1867040A (en) * | 2005-05-19 | 2006-11-22 | 晨星半导体股份有限公司 | Noise reduction method |
| CN1980402A (en) * | 2005-12-05 | 2007-06-13 | 晨星半导体股份有限公司 | Video signal brightness regulation device and method |
-
2007
- 2007-09-14 CN CN2007101521735A patent/CN101389040B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6362831B1 (en) * | 1997-11-04 | 2002-03-26 | Winbond Electronics Corp. | Method and apparatus for performing plural matrix multiplication operations using a single coded look-up table |
| CN1549205A (en) * | 2003-05-20 | 2004-11-24 | 矽统科技股份有限公司 | Digital image sharpness and brightness regulating method |
| CN1764282A (en) * | 2004-10-18 | 2006-04-26 | 晨星半导体股份有限公司 | Method and device for independent color management |
| CN1867040A (en) * | 2005-05-19 | 2006-11-22 | 晨星半导体股份有限公司 | Noise reduction method |
| CN1980402A (en) * | 2005-12-05 | 2007-06-13 | 晨星半导体股份有限公司 | Video signal brightness regulation device and method |
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| CN101389040A (en) | 2009-03-18 |
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Effective date of registration: 20191223 Address after: No.1, Duhang 1st Road, Hsinchu City, Hsinchu Science Park, Taiwan, China Patentee after: MEDIATEK Inc. Address before: Taiwan, China Patentee before: MSTAR SEMICONDUCTOR Inc. |
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