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| 1. Histogram Equalization | 1. 直方图均衡化：(a)写一个程序计算图像的直方图；(b)实现直方图均衡化算法；(c)下载图片这个图片 attachment:Fig0308.tif ，尝试对它进行直方图均衡化。你的报告中至少要包含原始图像、它的直方图、直方图均衡化转换函数的图示、增强后的图像、增强后的图像的直方图。通过这些结果来分析图像是怎么被增强的。 |
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| (a) Write a computer program for computing the histogram of an image. | 1. 算术运算：写一个程序能够对两幅图像进行四种算术运算。对于乘法，你的乘法函数要能够处理一幅图像乘以一个常数的情况。这个程序要写得通用一些，后面的程序可能需要用到这个算法。 |
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| (b) Implement the histogram equalization technique discussed in Section 3.3.1. | 1. 空域滤波。写一个程序对图像进行空域滤波。滤波模板的大小是固定的3x3。但是系数是可变的。这个程序要写得通用一些，后面的程序可能需要用到这个算法。 1. 拉普拉斯滤波。(a)使用前面两个程序实现一个拉普拉斯增强算法，使用如下模板{{{ -1 -1 -1 -1 8 -1 -1 -1 -1 }}} (b) 对图像 attachment:Fig0340.tif 进行拉普拉斯滤波，并对它进行增强以使其适合观测。 |
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| (c) Download Fig. 3.8(a) and perform histogram equalization on it. As a minimum, your report should include the original image, a plot of its histogram, a plot of the histogram-equalization transformation function, the enhanced image, and a plot of its histogram. Use this information to explain why the resulting image was enhanced as it was. 1. Arithmetic Operations Write a computer program capable of performing the four arithmetic operations between two images. This project is generic, in the sense that it will be used in other projects to follow. (See comments on pages 112 and 116 regarding scaling). In addition to multiplying two images, your multiplication function must be able to handle multiplication of an image by a constant. 1. Spatial Filtering Write program to perform spatial filtering of an image (see Section 3.5 regarding implementation). You can fix the size of the spatial mask at 3 x 3, but the coefficients need to be variables that can be input into your program. This project is generic, in the sense that it will be used in other projects to follow. 1. Enhancement Using the Laplacian (a) Use the programs developed in Projects 03-03 and 03-04 to implement the Laplacian enhancement technique described in connection with Eq. (3.7-5). Use the mask shown in Fig. 3.39(d). (b) Duplicate the results in Fig. 3.40. You will need to download Fig. 3.40(a). 1. Unsharp Masking (a) Use the programs developed in Projects 03-03 and 03-04 to implement high-boost filtering, as given in Eq. (3.7-8). The averaging part of the process should be done using the mask in Fig. 3.34(a). (b) Download Fig. 3.43(a) and enhance it using the program you developed in (a). Your objective is to choose constant A so that your result visually approximates Fig. 3.43(d). |
1. Unsharp masking：(a) Use the programs developed in Projects 03-03 and 03-04 to implement high-boost filtering, as given in Eq. (3.7-8). The averaging part of the process should be done using the mask in Fig. 3.34(a).(b) Download Fig. 3.43(a) and enhance it using the program you developed in (a). Your objective is to choose constant A so that your result visually approximates Fig. 3.43(d). |
实验内容
使用强度变换的图像增强。这个实验主要是尝试各种强度变换的方法来增强图像。下载一个这个图片 attachment:Fig0308.tif ，并尝试使用：(a) 对数变换公式g = c*log(1+double(f)) (b) 指数变换公式g = 1./(1 + (m./(double(f) + eps)).^E) 在(a)中只有唯一的参数c，而在(b)中有两个参数c和r。在大多数图像增强任务中，尝试是不可避免的。这个实验的目标是通过(a)和(b)方法得到最好的视觉增强效果。一旦(根据你自己的判断)你得到了两种变换的最好的视觉效果，请解释这两者之间的主要区别。
- 直方图均衡化：(a)写一个程序计算图像的直方图；(b)实现直方图均衡化算法；(c)下载图片这个图片 attachment:Fig0308.tif ，尝试对它进行直方图均衡化。你的报告中至少要包含原始图像、它的直方图、直方图均衡化转换函数的图示、增强后的图像、增强后的图像的直方图。通过这些结果来分析图像是怎么被增强的。
- 算术运算：写一个程序能够对两幅图像进行四种算术运算。对于乘法，你的乘法函数要能够处理一幅图像乘以一个常数的情况。这个程序要写得通用一些，后面的程序可能需要用到这个算法。
- 空域滤波。写一个程序对图像进行空域滤波。滤波模板的大小是固定的3x3。但是系数是可变的。这个程序要写得通用一些，后面的程序可能需要用到这个算法。
拉普拉斯滤波。(a)使用前面两个程序实现一个拉普拉斯增强算法，使用如下模板
-1 -1 -1 -1 8 -1 -1 -1 -1
(b) 对图像 attachment:Fig0340.tif 进行拉普拉斯滤波，并对它进行增强以使其适合观测。- Unsharp masking：(a) Use the programs developed in Projects 03-03 and 03-04 to implement high-boost filtering, as given in Eq. (3.7-8). The averaging part of the process should be done using the mask in Fig. 3.34(a).(b) Download Fig. 3.43(a) and enhance it using the program you developed in (a). Your objective is to choose constant A so that your result visually approximates Fig. 3.43(d).