matlab图像处理函数汇总.txt

用vc把相片的信息读入电脑,然后可以利用矩阵将数据进行编辑

conv2, filter2, freqspace, ftrans2, fwind1, fwind2 
35.fspecial
功能: 
创建预定义过滤器. 
语法: 
h = fspecial(type) 
h = fspecial(type,parameters) 
举例 
I = imread('saturn.tif'); 
h = fspecial('unsharp',0.5); 
I2 = filter2(h,I)/255; 
imshow(I) 
figure, imshow(I2) 
相关命令: 
conv2, edge, filter2, fsamp2, fwind1, fwind2 
36.ftrans2 
功能: 
通过频率转换设计二维FIR过滤器. 
语法: 
附录 MATLAB图像处理命令 337 
h = ftrans2(b,t) 
h = ftrans2(b) 
举例 
colormap(jet(64)) 
b = remez(10,[0 0.05 0.15 0.55 0.65 1],[0 0 1 1 0 0]); 
[H,w] = freqz(b,1,128,'whole'); 
plot(w/pi-1,fftshift(abs(H))) 
相关命令: 
conv2, filter2, fsamp2, fwind1, fwind2 
37.fwind1 
功能: 
用一维窗口方法设计二维FIR过滤器. 
语法: 
h = fwind1(Hd,win) 
h = fwind1(Hd,win1,win2) 
h = fwind1(f1,f2,Hd,...) 
举例 
[f1,f2] = freqspace(21,'meshgrid'); 
Hd = ones(21); 
r = sqrt(f1.^2 + f2.^2); 
Hd((r0.5)) = 0; 
colormap(jet(64)) 
mesh(f1,f2,Hd) 
相关命令: 
conv2, filter2, fsamp2, freqspace, ftrans2, fwind2 
38.fwind2 
功能: 
用二维窗口方法设计二维FIR过滤器. 
语法: 
h = fwind2(Hd,win) 
h = fwind2(f1,f2,Hd,win) 
举例 
[f1,f2] = freqspace(21,'meshgrid'); 
Hd = ones(21); 
r = sqrt(f1.^2 + f2.^2); 
Hd((r0.5)) = 0; 
colormap(jet(64)) 
mesh(f1,f2,Hd) 
MATLAB高级应用——图形及影像处理 338
相关命令: 
conv2, filter2, fsamp2, freqspace, ftrans2, fwind1 
39.getimage 
功能: 
从坐标轴取得图像数据. 
语法: 
A = getimage(h) 
[x,y,A] = getimage(h) 
[...,A,flag] = getimage(h) 
[...] = getimage 
举例 
imshow rice.tif 
I = getimage; 
40.gray2ind 
功能: 
转换灰度图像为索引图像. 
语法: 
[X,map] = gray2ind(I,n) 
相关命令: 
ind2gray 
41.grayslice 
功能: 
从灰度图像创建索引图像. 
语法: 
X = grayslice(I,n) 
X = grayslice(I,v) 
举例 
I = imread('ngc4024m.tif'); 
X = grayslice(I,16); 
imshow(I) 
figure, imshow(X,jet(16)) 
附录 MATLAB图像处理命令 339 
相关命令: 
gray2ind 
42.histeq 
功能: 
用柱状图均等化增强对比. 
语法: 
J = histeq(I,hgram) 
J = histeq(I,n) 
[J,T] = histeq(I,...) 
举例 
I = imread('tire.tif'); 
J = histeq(I); 
imshow(I) 
figure, imshow(J) 
imhist(I,64) 
figure; imhist(J,64) 
相关命令: 
brighten, imadjust, imhist 
43.hsv2rgb 
功能: 转换HSV值为RGB颜色空间. 
语法: 
rgbmap = hsv2rgb(hsvmap) 
RGB = hsv2rgb(HSV) 
相关命令: 
MATLAB高级应用——图形及影像处理 340
rgb2hsv, rgbplot 
44.idct2 
功能: 
计算二维离散反余弦变换. 
语法: 
B = idct2(A) 
B = idct2(A,m,n) 
B = idct2(A,[m n]) 
相关命令: 
dct2, dctmtx, fft2, ifft2 
45.ifft2 
功能: 
计算二维快速傅里叶反变换. 
语法: 
B = ifft2(A) 
B = ifft2(A,m,n) 
相关命令: 
fft2, fftshift, idct2 
46.ifftn 
功能: 计算n维快速傅里叶反变换. 
语法: 
B = ifftn(A) 
B = ifftn(A,siz) 
相关命令: 
fft2, fftn, ifft2 
47.sim2bw 
功能: 
转换图像为二进制图像. 
语法: 
BW = im2bw(I,level) 
BW = im2bw(X,map,level) 
BW = im2bw(RGB,level) 
举例 
load trees 
BW = im2bw(X,map,0.4); 
imshow(X,map) 
附录 MATLAB图像处理命令 341 
figure, imshow(BW) 
相关命令: 
ind2gray, rgb2gray 
48.im2col 
功能: 
重调图像块为列. 
语法: 
B = im2col(A,[m n],block_type) 
B = im2col(A,[m n]) 
B = im2col(A,'indexed',...) 
相关命令: 
blkproc, col2im, colfilt, nlfilter 
49.im2double 
功能: 
转换图像矩阵为双精度型. 
语法: 
I2 = im2double(I1) 
RGB2 = im2double(RGB1) 
BW2 = im2double(BW1) 
X2 = im2double(X1,'indexed') 
相关命令: 
double, im2uint8, uint8 
50.im2uint8 
功能: 
转换图像阵列为8位无符号整型. 
语法: 
I2 = im2uint8(I1) 
RGB2 = im2uint8(RGB1) 
BW2 = im2uint8(BW1) 
X2 = im2uint8(X1,'indexed') 
MATLAB高级应用——图形及影像处理 342
相关命令: 
im2uint16, double, im2double, uint8, imapprox, uint16 
51.im2uint16 
功能: 
转换图像阵列为16位无符号整型. 
语法: 
I2 = im2uint16(I1) 
RGB2 = im2uint16(RGB1) 
X2 = im2uint16(X1,'indexed') 
相关命令: 
im2uint8, double, im2double, uint8, uint16, imapprox 
52.imadjust 
功能: 
调整图像灰度值或颜色映像表. 
语法: 
J = imadjust(I,[low high],[bottom top],gamma) 
newmap = imadjust(map,[low high],[bottom top],gamma) 
RGB2 = imadjust(RGB1,...) 
举例 
I = imread('pout.tif'); 
J = imadjust(I,[0.3 0.7],[]); 
imshow(I) 
figure, imshow(J) 
相关命令: 
brighten, histeq 
53.imapprox 
功能: 
对索引图像进行近似处理. 
语法: 
[Y,newmap] = imapprox(X,map,n) 
附录 MATLAB图像处理命令 343 
[Y,newmap] = imapprox(X,map,tol) 
Y = imapprox(X,map,newmap) 
[...] = imapprox(...,dither_option) 
相关命令: 
cmunique, dither, rgb2ind 
54.imcontour 
功能: 
创建图像数据的轮廓图. 
语法: 
imcontour(I,n) 
imcontour(I,v) 
imcontour(x,y,...) 
imcontour(...,LineSpec) 
[C,h] = imcontour(...) 
举例 
I = imread('ic.tif'); 
imcontour(I,3) 
相关命令: 
clabel, contour, LineSpec 
55.imcrop 
功能: 
剪切图像. 
语法: 
I2 = imcrop(I) 
X2 = imcrop(X,map) 
RGB2 = imcrop(RGB) 
I2 = imcrop(I,rect) 
X2 = imcrop(X,map,rect) 
RGB2 = imcrop(RGB,rect) 
MATLAB高级应用——图形及影像处理 344
[...] = imcrop(x,y,...) 
[A,rect] = imcrop(...) 
[x,y,A,rect] = imcrop(...) 
举例 
I = imread('ic.tif'); 
I2 = imcrop(I,[60 40 100 90]); 
imshow(I) 
figure, imshow(I2) 
相关命令: 
zoom 
56.imfeature 
功能: 
计算图像区域的特征尺寸. 
语法: 
stats = imfeature(L,measurements) 
stats = imfeature(L,measurements,n) 
举例 
BW = imread('text.tif'); 
L = bwlabel(BW); 
stats = imfeature(L,'all'); 
stats(23) 
ans = 
Area: 89 
Centroid: [95.6742 192.9775] 
BoundingBox: [87.5000 184.5000 16 15] 
MajorAxisLength: 19.9127 
MinorAxisLength: 14.2953 
Eccentricity: 0.6961 
Orientation: 9.0845 
ConvexHull: [28x2 double] 
附录 MATLAB图像处理命令 345 
ConvexImage: [15x16 uint8 ] 
ConvexArea: 205 
Image: [15x16 uint8 ] 
FilledImage: [15x16 uint8 ] 
FilledArea: 122 
EulerNumber: 0 
Extrema: [ 8x2 double] 
EquivDiameter: 10.6451 
Solidity: 0.4341 
Extent: 0.3708 
PixelList: [89x2 double] 
相关命令: 
bwlabel 
57.imfinfo 
功能: 
返回图形文件信息. 
语法: 
info = imfinfo(filename,fmt) 
info = imfinfo(filename) 
举例 
info = imfinfo('canoe.tif') 
info = 
Filename:'canoe.tif' 
FileModDate: '25-Oct-1996 22:10:39' 
FileSize: 69708 
Format: 'tif' 
FormatVersion: [] 
Width: 346 
Height: 207 
BitDepth: 8 
ColorType: 'indexed' 
FormatSignature: [73 73 42 0] 
ByteOrder: 'little-endian' 
NewSubfileType: 0 
BitsPerSample: 8 
Compression: 'PackBits' 
PhotometricInterpretation: 'RGB Palette' 
MATLAB高级应用——图形及影像处理 346
StripOffsets: [ 9x1 double] 
SamplesPerPixel: 1 
RowsPerStrip: 23 
StripByteCounts: [ 9x1 double] 
XResolution: 72 
YResolution: 72 
ResolutionUnit: 'Inch' 
Colormap: [256x3 double] 
PlanarConfiguration: 'Chunky' 
TileWidth: [] 
TileLength: [] 
TileOffsets: [] 
TileByteCounts: [] 
Orientation: 1 
FillOrder: 1 
GrayResponseUnit: 0.0100 
MaxSampleValue: 255 
MinSampleValue: 0 
Thresholding: 1 
相关命令: 
imread, imwrite 
58.imhist 
功能: 
显示图像数据的柱状图. 
语法: 
imhist(I,n) 
imhist(X,map) 
[counts,x] = imhist(...) 
举例 
I = imread('pout.tif'); 
imhist(I) 
附录 MATLAB图像处理命令 347 
相关命令: 
histeq 
59.immovie 
功能: 
创建多帧索引图的电影动画. 
语法: 
mov = immovie(X,map) 
举例 
load mri 
mov = immovie(D,map); 
相关命令: 
montage 
60.imnoise 
功能: 
增加图像的渲染效果. 
语法: 
J = imnoise(I,type) 
J = imnoise(I,type,parameters) 
举例 
I = imread('eight.tif'); 
J = imnoise(I,'salt & pepper',0.02); 
imshow(I) 
figure, imshow(J) 
相关命令: 
rand 
61.impixel 
功能: 
确定像素颜色值. 
语法: 
MATLAB高级应用——图形及影像处理 348
P = impixel(I) 
P = impixel(X,map) 
P = impixel(RGB) 
P = impixel(I,c,r) 
P = impixel(X,map,c,r) 
P = impixel(RGB,c,r) 
[c,r,P] = impixel(...) 
P = impixel(x,y,I,xi,yi) 
P = impixel(x,y,X,map,xi,yi) 
P = impixel(x,y,RGB,xi,yi) 
[xi,yi,P] = impixel(x,y,...) 
举例 
RGB = imread('flowers.tif'); 
c = [12 146 410]; 
r = [104 156 129]; 
pixels = impixel(RGB,c,r) 
pixels = 
61 59 101 
253 240 0 
237 37 44 
相关命令: 
improfile, pixval 
62.improfile 
功能: 
沿线段计算剖面图的像素值. 
语法: 
c = improfile 
c = improfile(n) 
c = improfile(I,xi,yi) 
c = improfile(I,xi,yi,n) 
[cx,cy,c] = improfile(...) 
[cx,cy,c,xi,yi] = improfile(...) 
[...] = improfile(x,y,I,xi,yi) 
[...] = improfile(x,y,I,xi,yi,n) 
附录 MATLAB图像处理命令 349 
[...] = improfile(...,method) 
举例 
I = imread('alumgrns.tif'); 
x = [35 338 346 103]; 
y = [253 250 17 148]; 
improfile(I,x,y), grid on 
相关命令: 
impixel, pixval 
63.imread 
功能: 
从图形文件中读取图像. 
语法: 
A = imread(filename,fmt) 
[X,map] = imread(filename,fmt) 
[...] = imread(filename) 
[...] = imread(...,idx) (TIFF only) 
[...] = imread(...,ref) (HDF only) 
[...] = imread(...,'BackgroundColor',BG) (PNG only) 
[A,map,alpha] = imread(...) (PNG only) 
举例 
[X,map] = imread('flowers.tif',6); 
info = imfinfo('skull.hdf'); 
[X,map] = imread('skull.hdf',info(4).Reference); 
bg = [255 0 0]; 
A = imread('image.png','BackgroundColor',bg); 
MATLAB高级应用——图形及影像处理 350
[A,map,alpha] = imread('image.png'); 
相关命令: 
imfinfo, imwrite,fread,double,uint8,uint16 
64.imresize 
功能: 
改变图像大小. 
语法: 
B = imresize(A,m,method) 
B = imresize(A,[mrows ncols],method) 
B = imresize(...,method,n) 
B = imresize(...,method,h) 
65.imrotate 
功能: 
旋转图像. 
语法: 
B = imrotate(A,angle,method) 
B = imrotate(A,angle,method,'crop') 
举例 
I = imread('ic.tif'); 
J = imrotate(I,-4,'bilinear','crop'); 
imshow(I) 
figure, imshow(J) 
相关命令: 
imcrop, imresize 
66.imshow 
功能: 
显示图像. 
语法: 
附录 MATLAB图像处理命令 351 
imshow(I,n) 
imshow(I,[low high]) 
imshow(BW) 
imshow(X,map) 
imshow(RGB) 
imshow(...,display_option) 
imshow(x,y,A,...) 
imshow filename 
h = imshow(...) 
相关命令: 
getimage, imread, iptgetpref, iptsetpref, subimage, truesize, warp 
67.imwrite 
功能: 
把图像写入图形文件中. 
语法: 
imwrite(A,filename,fmt) 
imwrite(X,map,filename,fmt) 
imwrite(...,filename) 
imwrite(...,Param1,Val1,Param2,Val2...) 
举例 
imwrite(X,map,'flowers.hdf','Compression','none',... 
'WriteMode','append') 
相关命令: 
imfinfo, imread 
68.ind2gray 
功能: 
把检索图像转化为灰度图像. 
语法: 
I = ind2gray(X,map) 
举例 
load trees 
I = ind2gray(X,map); 
imshow(X,map) 
figure,imshow(I) 
MATLAB高级应用——图形及影像处理 352
相关命令: 
gray2ind, imshow, rgb2ntsc 
69.ind2rgb 
功能: 
转化索引图像为RGB真彩图像. 
语法: 
RGB = ind2rgb(X,map) 
相关命令: 
ind2gray, rgb2ind 
70.iptgetpref 
功能: 
获取图像处理工具箱参数设置. 
语法: 
value = iptgetpref(prefname) 
举例 
value = iptgetpref('ImshowAxesVisible') 
value =