小弟我matlab是用5.3 想把這張圖()用matlab轉成灰階 (Matlab)影像處理運用想轉成灰階 - 趣味新聞網

發表日期 2009-02-24T15:18:13+08:00

     本帖最後由 koyadji 於 2009-2-26 08:02 編輯

小弟我matlab是用5.3，想把這張圖( )用matlab轉成灰階，爬瞭很多文上網也找很久但都轉不齣來，本身我是半路齣傢看書和網路上爬文自學，所以底子很不紮實，想問那位先進可以幫忙解惑跟我說一下程式的撰寫。
想請會的先進可以寫成完整程式並可以讓matlab執行成功嗎，秀齣灰階的Figure？(本身有執行成功)
十分感謝各位先進！
下麵程式是我在書中或是Matlab help 或網路找到.....
但試試都沒有成功，所以想請教各位善心人士。

Filename: 'C:MATLABR11workD33.bmp'
FileModDate: '11-Feb-2009 16:02:04'
FileSize: 82998
Format: 'bmp'
FormatVersion: 'Version 3 (Microsoft Windows 3.x)'
Width: 320
Height: 256
BitDepth: 8
ColorType: 'indexed'
FormatSignature: 'BM'
NumColormapEntries: 256
Colormap: [256x3 double]
RedMask: []
GreenMask: []
BlueMask: []
ImageDataOffset: 1078
BitmapHeaderSize: 40
NumPlanes: 1
CompressionType: 'none'
BitmapSize: 81920
HorzResolution: 0
VertResolution: 0
NumColorsUsed: 256
NumImportantColors: 0

書中或是Matlab help 或網路找到:

1.網路討論區

img0 = imread('C:MATLABR11workD35.bmp');

image(img0)

img1 = rgb2gray(img0);

[img2,map] = gray2ind(img1,64);

image(img2)


2.Matlab help

This example reads an 8-bit RGB image into MATLAB and converts it to a grayscale image.

rgb_img = imread('ngc6543a.jpg');   % Load the image

image(rgb_img)   % Display the RGB image


Now calculate the monochrome luminance by combining the RGB values according to the NTSC standard, which applies coefficients related to the eye's sensitivity to RGB colors.

I = .2989*rgb_img(:,:,1)...
+.5870*rgb_img(:,:,2)...
+.1140*rgb_img(:,:,3);



I is an intensity image with integer values ranging from a minimum of zero,
min(I(:))
ans =
0



to a maximum of 255,
max(I(:))
ans =
255



To display the image, use a grayscale colormap with 256 values. This avoids the need to scale the data-to-color mapping, which would be required if you used a colormap of a different size. You can use the imagesc function in cases where the colormap does not contain one entry for each data value.

Now display the image in a new figure using the gray colormap.

figure; colormap(gray(256)); image(I)

[ 本帖最後由 風箏惡魔 於 2009-2-24 19:05 編輯 ]

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