digital image processing projects 数字图像处理 冈萨雷斯 第三

Digital Image Processing

Project chapter： Chapter 3 Project number：Proj03-01 ~ Proj03-06 Student's name： Student's number： Class：

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Contents

IMAGE ENHANCEMENT USING INTENSITY TRANSFORMATIONS ................ 1 HISTOGRAM EQUALIZATION ................................................................................. 7 ARITHMETIC OPERATIONS ................................................................................... 10 SPATIAL FILTERING ................................................................................................. 14 ENHANCEMENT USING THE LAPLACIAN.......................................................... 17 UNSHARP MASKING ............................................................................................... 20

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Image Enhancement Using Intensity Transformations

Exp. 5，PROJECT 03-01

Objective

To manipulate a technique of image enhancementbyintensitytransformation or gray level transformation.

Requirements

The focus of this project is to experiment with intensity transformations toenhance an image. Download Fig. 3.8(a) and enhance it using: (a) The log transformation of Eq. (3.2-2): s=clog(1+r);

(b) A power-law transformation of the form shown in Eq. (3.2-3): s=crγ.

Figure 1 Fig 3.05(a)

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Figure 2Fig. 3.8(a)

Technical discussion

【1】I = mat2gray(A)

sets the values of amin and amax to the minimum and maximum values in A.

【2】I2 = im2uint8(I1)

converts the grayscale image I1 to uint8, rescaling the data if necessary.

Program listings

【1】log transformation

I=imread('Fig3.05(a).jpg'); subplot(121); imshow(I); title('original');

I1=im2uint8(mat2gray(log(1+double(I)))); subplot(122); imshow(I1);

title('log transformation');

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