實驗要求：

Zooming and Shrinking Images by Pixel Replication
Objective
To manipulate a technique of zooming and shrinking images by pixel replication.
Main requirements: Ability of programming with C, C++, or Matlab.
Instruction manual:
(a) Write a computer program capable of zooming and shrinking an image by pixel replication. Assume that the desired zoom/shrink factors are integers. You may ignore aliasing effects. You will need to download Fig. 2.19(a).
(b) Download Fig. 2.19 (a) and use your program to shrink the image from 1024 x 1024 to 256 x 256 pixels.
(c) Use your program to zoom the image in (b) back to 1024 x 1024. Explain the reasons for their differences.

實驗?zāi)康木褪峭ㄟ^編程對圖像大小進行放大或縮小。

上代碼：

%% clear all; clc; close all;%% % 1024*1024 to 256*256 shrink; img_name = 'general_img_1024.jpg'; img = imread(img_name);img1 = imresize(img, [256, 256]); figure(1) imshow(img); title('1024 * 1024'); figure(2) imshow(img1); title('256 * 256');imwrite(img1,'general_img_shrinked.jpg');% 256 * 256 to 1024 * 1024 zoom； img_name = 'general_img_shrinked.jpg' img2 = imread(img_name); img3 = imresize(img, [1024, 1024]);figure(3) imshow(img3); title('1024 * 1024');imwrite(img3,'general_img_zoomed.jpg');

程序中主要調(diào)用了MATLAB中的 imresize 這個函數(shù)對圖像大小進行縮放。

實驗結(jié)果：

總結(jié)

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