CN1185859C - 数码影像内插及清晰度增强的方法 - Google Patents
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Abstract
一种用于数码影像内插清晰度增强的方法包括下列步骤:1)输入影像信号Xij至第一内插低通滤波器FIR1;2)输入影像信号Xij到至少一第二内插低通滤波器FIR2,FIR2具有小于FIR1的截止频率;3)使FIR1的输出经由一带通滤波器得一影像信号tij;4)使FIR2的输出经由一延迟缓冲器,得一影像信号tij’;5)输入影像信号tij及tij’至一减法器而得差动信号tij-tij’;6)利用下一方程式得输出的影像信号Yij,Yij=tij+S·(tij-tij’)。
Description
技术领域
本发明涉及一种像素内插法,尤其涉及一种用于增强数码影像边缘清晰度的像素内插法。
背景技术
近来,数码影像已渐增地应用在各种影像的显示上,其清晰,不受干扰及易于处理的特性使得全世界相关技术制造商或研究机构均投入相当大的物力及人力于研究及发展上。从阴极射线管(CRT)到液晶显示器(LCD)的数码影像以及从电脑,数码投影机到一般告示显示装置上的应用中,数码影像资料的显示及处理上已获得令人注目的成果。
然而,在对诸如图形或影像资料数码影像的处理上,例如放大或缩小图形或影像,为使影像在处理后维持其清晰度(Sharpness),大多数业者常采用影像内插法(imageinterpolation),但此法常常使得放大或缩小的影像在影像边缘上产生极差的清晰度,此种边缘清晰度的缺陷特别地在宽尺寸大屏幕的液晶显示器(诸如15”以上者)及彩色数码影像上尤其显著。如图1所示即为现有技术用于数码影像内插法的方框图,其仅采用双三次滤波器1(bi-cubic filter)执行数码影像的内插法,而其清晰度变差的原因是由于采用低通滤波器将若干相邻的像素予以按比例地累加来产生新的像素的缘故,因而造成在影像边缘处模糊及失真,亦即,在该现有技术的像素内插法中是针对整个影像的所有像素作内插运算,因此在影像的边缘上会显示出失真或清晰度变差的缺陷。
发明内容
因此,本发明目的在于提供一种用于数码影像内插及清晰度增强的方法,其可改善数码影像的影像边缘的清晰度,以取得最佳的可调整的清晰度准位,无需改变滤波器的滤波系数,而可维持在图形或影像上的低频成份。
为实现上述目的,根据本发明的用于数码影像内插及清晰度增强的方法包含下列步骤:
1)输入影像信号Xij至一第一内插低通滤波器FIR 1,该FIR1为具有滤波系数hi(n)的双三次内插滤波器;
2)输入影像信号Xij到至少一第二内插低通滤波器FIR 2,该FIR 2为具有滤波系数hi’(n)的内插滤波器,其中该FIR 2具有小于FIR 1的截止频率;
3)使该FIR 1的输出经由一带通滤波器而取得一影像信号tij;
4)当执行边缘处理时,使该FIR 2的输出经由一延迟缓冲器,以取得一与该影像信号tij相对应时间的影像信号tij’;
5)输入该影像信号tij及tij’至一减法器而取得差动信号tij-tij’;以及
6)利用下一方程式获得输出的影像信号Yij,
Yij=tij+S·(tij-tij’),
其中S为清晰度准位控制系数。
附图说明
图1为现有技术用于数码影像内插及清晰度增强方法的系统方框图;
图2为本发明用于数码影像内插及清晰度增强方法的系统方框图;
图3为本发明所显示的频率相应曲线图;
图4a为多相式滤波器的单一滤波器的设计图;以及
图4b为本发明所应用的多相式滤波器的系统方框图。
具体实施方式
图2所示为本发明的系统方框图,其中FIR 1及FIR 2为内插低通滤波器,分别具有滤波系数hi(n)及hi’(n),其中FIR 2具有低于FIR 1的截止频率(cut-off frequency),当输入数码影像信号Xij到FIR 1以执行双三次内插滤波(bi-cubic interpolationfiltering)时,将若干相邻的像素予以按比例处理,例如在放大影像一倍的情况下,诸如影像亮度信号系像素1+1+2+3/4来代表新像素1,像素1+2+2+3/4来代表新像素2,...等,同时,输入数码影像信号到FIR 2执行边缘的内插滤波器处理,使该FIR 1的输出经由一带通滤波器2而取得影像信号tij,由于经带通滤波器2的时间差关系,使该FIR 2的输出经由一延迟缓冲器3以取得与该影像数码tij相对应时间的影像信号tij’,将该tij及tjj’的影像信号输入至一减法器以取得该两影像信号间的差动信号tij-tij’,再将该差动信号tij-tij’乘以清晰度准位控制系数S而取得已被控制清晰度准位的清晰度量[S·(tij-tij’)],接着将该清晰度量加入于经内插处理的影像信号tij而取得改善清晰度的影像输出信号Yij。
图3所示为本发明所显示的频率响应曲线图,其中FIR 1及FIR 2以相同的延迟,同时处理影像信号以使处理频带宽度及缓冲器最小化,而FIR 2显示具有较高Q值的曲线,于处理影像边缘时可获得较高的清晰度。
图4a所示为一般多相式滤波器Z的单一滤波器的设计图,其中m,n均为正整数,即表示放大或缩小的倍数,以及图4b所示为利用图4a的多相式滤波器的单一滤波器串联而成,为本发明应用多相式滤波器的实施例的系统方框图,其中Z表示一级如图4a中所示的滤波器。如此,所输入的影像信号经由该多相式滤波器的多级单一滤波器的加和效果,使得影像边缘清晰度不致失真。
本领域普通技术人员将理解到,本发明并未受限于上述说明,而是可允许种种修饰及变化,然而,本发明将以所附录的申请专利范围及范畴来加以涵盖。
Claims (1)
1.一种用于数码影像内插及清晰度增强的方法,包括下列步骤:
1)输入影像信号Xij至一第一内插低通滤波器FIR 1,该FIR1为具有滤波系数hi(n)的双三次内插滤波器;
2)输入影像信号Xij到至少一第二内插低通滤波器FIR 2,该FIR 2为具有滤波系数hi’(n)之内插滤波器,其中该FIR 2具有小于FIR 1的截止频率;
3)使该FIR 1的输出经由一带通滤波器而取得一影像信号tij;其特征在于,
4)当执行边缘处理时,使该FIR 2的输出经由一延迟缓冲器,以取得一与该影像信号tij相对应时间的影像信号tij’;
5)输入该影像信号tij及tij’至一减法器而取得差动信号tij-tij’;以及
6)利用下一方程式获得输出的影像信号Yij,
Yij=tij+S·(tij-tij’),
其中S为清晰度准位控制系数。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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CNB001211226A CN1185859C (zh) | 2000-07-27 | 2000-07-27 | 数码影像内插及清晰度增强的方法 |
US09/707,041 US6697540B1 (en) | 2000-07-27 | 2000-11-06 | Method for digital image interpolation and sharpness enhancement |
JP2001019752A JP2002247365A (ja) | 2000-07-27 | 2001-01-29 | ディジタル画像の補間及び鮮明度増大のための方法 |
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CNB001211226A CN1185859C (zh) | 2000-07-27 | 2000-07-27 | 数码影像内插及清晰度增强的方法 |
US09/707,041 US6697540B1 (en) | 2000-07-27 | 2000-11-06 | Method for digital image interpolation and sharpness enhancement |
JP2001019752A JP2002247365A (ja) | 2000-07-27 | 2001-01-29 | ディジタル画像の補間及び鮮明度増大のための方法 |
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CN1336757A CN1336757A (zh) | 2002-02-20 |
CN1185859C true CN1185859C (zh) | 2005-01-19 |
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US20050187433A1 (en) * | 2001-07-26 | 2005-08-25 | Given Imaging Ltd. | In-vivo imaging device providing constant bit rate transmission |
US9113846B2 (en) * | 2001-07-26 | 2015-08-25 | Given Imaging Ltd. | In-vivo imaging device providing data compression |
US7466870B2 (en) * | 2003-01-16 | 2008-12-16 | Acoustic Technology Llc | Apparatus and method for creating effects in video |
IL155175A (en) * | 2003-03-31 | 2012-01-31 | Given Imaging Ltd | A diagnostic device that uses information thinning |
CN100525380C (zh) * | 2003-07-07 | 2009-08-05 | 致伸科技股份有限公司 | 使用模糊屏蔽法进行影像处理的方法 |
CN100557631C (zh) * | 2007-12-17 | 2009-11-04 | 华为技术有限公司 | 一种对数字图像进行插值的方法及装置 |
US8724928B2 (en) * | 2009-08-31 | 2014-05-13 | Intellectual Ventures Fund 83 Llc | Using captured high and low resolution images |
US8798388B2 (en) * | 2009-12-03 | 2014-08-05 | Qualcomm Incorporated | Digital image combining to produce optical effects |
JP5706177B2 (ja) * | 2010-02-09 | 2015-04-22 | パナソニック インテレクチュアル プロパティ コーポレーション オブアメリカPanasonic Intellectual Property Corporation of America | 超解像処理装置及び超解像処理方法 |
KR20140086632A (ko) | 2012-12-28 | 2014-07-08 | 삼성디스플레이 주식회사 | 영상 처리 장치 및 그것을 포함하는 표시 장치 |
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US5485534A (en) * | 1990-03-28 | 1996-01-16 | Fuji Photo Film Co., Ltd. | Method and apparatus for emphasizing sharpness of image by detecting the edge portions of the image |
DE19525531A1 (de) * | 1995-07-13 | 1997-01-16 | Philips Patentverwaltung | Verfahren zur Zwischenbild-Interpolation von Farbdifferenzsignalen sowie Schaltungsanordnung zur Durchführung dieses Verfahrens |
US6072538A (en) * | 1997-07-22 | 2000-06-06 | Sony Corporation | Digital image enhancement |
EP0921494B1 (en) * | 1997-12-03 | 2003-10-15 | Fuji Photo Film Co., Ltd. | Interpolating operation method and apparatus for image signals |
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