代数运算 (Algebraic operation)
相加。
相减。
相乘。
相除
图像融合要点：
代数运算迭加相减,DSA,运动物体检测 。
相乘：提取或删掉图象某部分 。
相除：遥感多光谱图象相除抵消入射分量 i(x,y)。
实 例相加
M=1
M=2 M=4 M=16
Addition:
– averaging for noise reduction
相加相加相加相加相加相加相加
F0108401 曹立基作品相加相加相加相加对准 drag钮按住鼠标左键移动相减p.109
相减相减相减相减相减相减
DSA
X-ray image obtained before and after injection of dye
into arteries,Dye affects appearance of blood vessels
but not surrounding tissues,Subtracting pre- and post-
injection images enhances blood vessels relative to
tissues,(Image courtesy of D,W,Holdsworth,RRI.)
相减
DSA
相减
DSA
相减：检测运动物体相减相乘相乘相乘?Multiplication:– masking used to zero out areas that you
don’t want to use in calculations
x
(a) Magnetic resonance velocity image through the
human neck,Multiplying by the mask in (b) isolates
pixels corresponding to one of the carotid arteries,
Averaging pixel values inside the masked region and
multiplying by the area of the mask yields the average
blood flow,(Image courtesy of D,A,Steinman,RRI.)
(a) (b)
相乘相除?Division:
– image formation is often a multiplicative process:
– need to eliminate I(x,y) for better visualization
and processing (e.g.,thresholding)
Black blood MR image through neck of a subject,
The rolloff in image intensity can be modelled as a
multiplicative process,(Image courtesy of D,A,
Steinman,RRI.)
相除
(a) Black blood MR image through neck of a subject,(b)
Image after dividing out estimated rolloff function,
(Image courtesy of D,A,Steinman,RRI.)
(a) (b)
Division (cont’d):
– estimate I(x,y) and divide it out
– many procedures for estimating I(x,y); will cover
one later (homomorphic filtering)
Matlab
相除
Matlab
相除魔术中的相加相减坦克消失图象融合 Image fusion Page 347
龙
Sphinx
adidas
F0108201 刘丹作品
F0108201 刘丹作品
MicroCD?
点击图片播放视频
Homework
Page112
Problem 1
Problem 2
Note:
Solutions of the problems should be written in
English.
相加。
相减。
相乘。
相除
图像融合要点：
代数运算迭加相减,DSA,运动物体检测 。
相乘：提取或删掉图象某部分 。
相除：遥感多光谱图象相除抵消入射分量 i(x,y)。
实 例相加
M=1
M=2 M=4 M=16
Addition:
– averaging for noise reduction
相加相加相加相加相加相加相加
F0108401 曹立基作品相加相加相加相加对准 drag钮按住鼠标左键移动相减p.109
相减相减相减相减相减相减
DSA
X-ray image obtained before and after injection of dye
into arteries,Dye affects appearance of blood vessels
but not surrounding tissues,Subtracting pre- and post-
injection images enhances blood vessels relative to
tissues,(Image courtesy of D,W,Holdsworth,RRI.)
相减
DSA
相减
DSA
相减：检测运动物体相减相乘相乘相乘?Multiplication:– masking used to zero out areas that you
don’t want to use in calculations
x
(a) Magnetic resonance velocity image through the
human neck,Multiplying by the mask in (b) isolates
pixels corresponding to one of the carotid arteries,
Averaging pixel values inside the masked region and
multiplying by the area of the mask yields the average
blood flow,(Image courtesy of D,A,Steinman,RRI.)
(a) (b)
相乘相除?Division:
– image formation is often a multiplicative process:
– need to eliminate I(x,y) for better visualization
and processing (e.g.,thresholding)
Black blood MR image through neck of a subject,
The rolloff in image intensity can be modelled as a
multiplicative process,(Image courtesy of D,A,
Steinman,RRI.)
相除
(a) Black blood MR image through neck of a subject,(b)
Image after dividing out estimated rolloff function,
(Image courtesy of D,A,Steinman,RRI.)
(a) (b)
Division (cont’d):
– estimate I(x,y) and divide it out
– many procedures for estimating I(x,y); will cover
one later (homomorphic filtering)
Matlab
相除
Matlab
相除魔术中的相加相减坦克消失图象融合 Image fusion Page 347
龙
Sphinx
adidas
F0108201 刘丹作品
F0108201 刘丹作品
MicroCD?
点击图片播放视频
Homework
Page112
Problem 1
Problem 2
Note:
Solutions of the problems should be written in
English.
