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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="Asciidoctor 1.5.4">
<title>Processamento Digital de Imagens Exercicios</title>
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</head>
<body class="article toc2 toc-left">
<div id="header">
<h1>Processamento Digital de Imagens Exercicios</h1>
<div id="toc" class="toc2">
<div id="toctitle">Sumario</div>
<ul class="sectlevel1">
<li><a href="#_manipulando_pixels_em_uma_imagem">Manipulando pixels em uma imagem</a>
<ul class="sectlevel2">
<li><a href="#_regiões">Regiões</a></li>
<li><a href="#_troca_regiões">Troca regiões</a></li>
</ul>
</li>
<li><a href="#_preenchendo_regiões">Preenchendo regiões</a>
<ul class="sectlevel2">
<li><a href="#_contando_objetos_problema">Contando objetos problema</a></li>
<li><a href="#_contando_objetos_com_buracos">Contando objetos com buracos</a></li>
</ul>
</li>
<li><a href="#_manipulação_de_histogramas">Manipulação de histogramas</a>
<ul class="sectlevel2">
<li><a href="#_equalizador_histograma">Equalizador histograma</a></li>
<li><a href="#_detecção_de_movimento">Detecção de movimento</a></li>
</ul>
</li>
<li><a href="#_filtragem_no_domínio_espacial_i">Filtragem no domínio espacial I</a>
<ul class="sectlevel2">
<li><a href="#_laplace_com_gauss">Laplace com gauss</a></li>
</ul>
</li>
<li><a href="#_filtragem_no_domínio_espacial_ii">Filtragem no domínio espacial II</a>
<ul class="sectlevel2">
<li><a href="#_tiltshift">TiltShift</a></li>
<li><a href="#_tiltshift_com_video">TiltShift com video</a></li>
</ul>
</li>
<li><a href="#_filtragem_no_domínio_da_frequência">Filtragem no domínio da frequência</a>
<ul class="sectlevel2">
<li><a href="#_filtro_homomorfico">Filtro Homomorfico</a></li>
</ul>
</li>
<li><a href="#_canny">Canny</a>
<ul class="sectlevel2">
<li><a href="#_canny_e_a_arte_com_pontilhismo">Canny e a arte com pontilhismo</a></li>
</ul>
</li>
<li><a href="#_bibliografia">Bibliografia</a></li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Vitor Ramos <<a href="mailto:[email protected]">[email protected]</a>></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_manipulando_pixels_em_uma_imagem">Manipulando pixels em uma imagem</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_regiões">Regiões</h3>
<div class="paragraph">
<p>Implementar de um programa que deverá solicitar ao usuário as coordenadas de dois pontos \$P_1\$ e \$P_2\$ localizados dentro dos limites do tamanho da imagem que lhe for fornecida e exibir. Entretanto, a região definida pelo retângulo de vértices opostos definidos pelos pontos \$P_1\$ e \$P_2\$ será exibida com o negativo da imagem na região correspondente.</p>
</div>
<div class="listingblock">
<div class="title">O codigo</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="c++"><span class="preprocessor">#include</span> <span class="include"><iostream></span>
<span class="preprocessor">#include</span> <span class="include"><cv.h></span>
<span class="preprocessor">#include</span> <span class="include"><highgui.h></span>
<span class="directive">using</span> <span class="keyword">namespace</span> cv;
<span class="directive">using</span> <span class="keyword">namespace</span> std;
<span class="predefined-type">int</span> main(<span class="predefined-type">int</span>, <span class="predefined-type">char</span>**)
{
Mat image;
Vec3b val;
image= imread(<span class="string"><span class="delimiter">"</span><span class="content">biel.png</span><span class="delimiter">"</span></span>,CV_LOAD_IMAGE_GRAYSCALE); <span class="comment">// carrega a imagem biel.png</span>
<span class="keyword">if</span>(!image.data)
cout << <span class="string"><span class="delimiter">"</span><span class="content">nao abriu biel.png</span><span class="delimiter">"</span></span> << endl;
namedWindow(<span class="string"><span class="delimiter">"</span><span class="content">janela</span><span class="delimiter">"</span></span>,WINDOW_AUTOSIZE);
Point p1, p2;
<span class="keyword">do</span>
{
cout << <span class="string"><span class="delimiter">"</span><span class="content">Digite p1 : </span><span class="delimiter">"</span></span>;
cin >> p1.x >> p1.y;
cout << <span class="string"><span class="delimiter">"</span><span class="content">Digite p2 : </span><span class="delimiter">"</span></span>;
cin >> p2.x >> p2.y;
}<span class="keyword">while</span>(p1.x > image.size().width || p2.x > image.size().width ||
p2.y > image.size().height || p2.y > image.size().height ||
p1.x > p2.x || p1.y > p2.y || p1.x < <span class="integer">0</span> || p1.y < <span class="integer">0</span> || p2.x < <span class="integer">0</span> || p2.y < <span class="integer">0</span>);
<span class="comment">// fica no while enquato os pontos nao sao validos</span>
<span class="keyword">for</span>(<span class="predefined-type">int</span> i=p1.x; i<p2.x; i++)
<span class="keyword">for</span>(<span class="predefined-type">int</span> j=p1.y; j<p2.y; j++)
image.at<uchar>(j, i)= <span class="integer">255</span>-image.at<uchar>(j, i);<span class="comment">//inverte o valor do pixel dentro da regiao</span>
imshow(<span class="string"><span class="delimiter">"</span><span class="content">janela</span><span class="delimiter">"</span></span>, image);
imwrite(<span class="string"><span class="delimiter">"</span><span class="content">biel2.png</span><span class="delimiter">"</span></span>, image); <span class="comment">// salva a imagem</span>
waitKey();
<span class="keyword">return</span> <span class="integer">0</span>;
}</code></pre>
</div>
</div>
<div class="paragraph">
<div class="title">Imagem Original</div>
<p><span class="image"><img src="Regioes//biel.png" alt="biel"></span></p>
</div>
<div class="paragraph">
<div class="title">Resultado</div>
<p><span class="image"><img src="Regioes//resultado.png" alt="resultado"></span></p>
</div>
</div>
<div class="sect2">
<h3 id="_troca_regiões">Troca regiões</h3>
<div class="paragraph">
<p>Implementar um programa que deverar trocar aleatoriamente regiões da imagem, formando uma espécie de quebra-cabeças. Explore o uso da classe Mat e seus construtores para criar as regiões que serão trocadas. O efeito é ilustrado na Figura Troca de regiões.</p>
</div>
<div class="listingblock">
<div class="title">O codigo</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="c++"><span class="preprocessor">#include</span> <span class="include"><iostream></span>
<span class="preprocessor">#include</span> <span class="include"><cv.h></span>
<span class="preprocessor">#include</span> <span class="include"><highgui.h></span>
<span class="preprocessor">#include</span> <span class="include"><time.h></span>
<span class="preprocessor">#include</span> <span class="include"><stdlib.h></span>
<span class="directive">using</span> <span class="keyword">namespace</span> cv;
<span class="directive">using</span> <span class="keyword">namespace</span> std;
<span class="predefined-type">int</span> main(<span class="predefined-type">int</span>, <span class="predefined-type">char</span>**)
{
srand(time(<span class="predefined-constant">NULL</span>));
Mat image;
Vec3b val;
<span class="predefined-type">int</span> n; <span class="comment">// raiz do numero de regioes</span>
image= imread(<span class="string"><span class="delimiter">"</span><span class="content">abc.jpg</span><span class="delimiter">"</span></span>,CV_LOAD_IMAGE_COLOR);
<span class="keyword">if</span>(!image.data)
cout << <span class="string"><span class="delimiter">"</span><span class="content">nao abriu abc.jpg</span><span class="delimiter">"</span></span> << endl;
namedWindow(<span class="string"><span class="delimiter">"</span><span class="content">janela</span><span class="delimiter">"</span></span>,WINDOW_AUTOSIZE);
cout << <span class="string"><span class="delimiter">"</span><span class="content">Digite o Numero de Regioes : </span><span class="delimiter">"</span></span>;
cin >> n; <span class="comment">// numero de divisoes em uma linha</span>
<span class="predefined-type">int</span> wr= image.size().width/n, hr= image.size().height/n;
<span class="keyword">for</span>(<span class="predefined-type">int</span> i=<span class="integer">0</span>; i<n; i++)
{
<span class="keyword">for</span>(<span class="predefined-type">int</span> j=<span class="integer">0</span>; j<n; j++)
{
<span class="comment">// A ideia e pegar cada regiao e trocar com uma regiao aleatoria na imagem</span>
<span class="predefined-type">int</span> rx= rand()%n, ry= rand()%n; <span class="comment">// duas posicoes aleatorias de regioes</span>
Mat randpos= image(Rect(wr*rx,hr*ry,wr,hr)); <span class="comment">// a regiao escolhida aleatoriamente</span>
Mat aux= image(Rect(wr*i,hr*j,wr, hr)).clone(); <span class="comment">// a regiao atual</span>
randpos.copyTo(image(Rect(wr*i,hr*j,wr, hr))); <span class="comment">// copia a regiao aleatoria na regiao atual</span>
aux.copyTo(image(Rect(wr*rx,hr*ry,wr,hr))); <span class="comment">// copia a regial atual na regiao aleatoria</span>
}
}
imshow(<span class="string"><span class="delimiter">"</span><span class="content">janela</span><span class="delimiter">"</span></span>, image);
imwrite(<span class="string"><span class="delimiter">"</span><span class="content">abc2.jpg</span><span class="delimiter">"</span></span>, image);
waitKey();
<span class="keyword">return</span> <span class="integer">0</span>;
}</code></pre>
</div>
</div>
<div class="paragraph">
<div class="title">Imagem Original</div>
<p><span class="image"><img src="TrocaRegioes//abc.jpg" alt="abc"></span></p>
</div>
<div class="paragraph">
<div class="title">Resultado 1</div>
<p><span class="image"><img src="TrocaRegioes//resultado.png" alt="resultado"></span></p>
</div>
<div class="paragraph">
<div class="title">Resultado 2</div>
<p><span class="image"><img src="TrocaRegioes//resultado2.png" alt="resultado2"></span></p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_preenchendo_regiões">Preenchendo regiões</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_contando_objetos_problema">Contando objetos problema</h3>
<div class="paragraph">
<p>Observando-se o programa labeling.cpp como exemplo, é possível verificar que caso existam mais de 255 objetos na cena, o processo de rotulação poderá ficar comprometido. Identifique a situação em que isso ocorre e proponha uma solução para este problema.</p>
</div>
<div class="paragraph">
<p><span class="red">Solucao</span> : Isso ocorre porque para cada objeto é atribuido um valor de cinza, se a imagem tive mais de 255 objetos o programa vai atribuir valores invalidos de cinza pois a imagem só possui 8 bits, a solução é fixar o valor de cinza dos objetos encontrados assim o programa podera classificar quantos objetos tiver na imagem.</p>
</div>
<div class="listingblock">
<div class="title">Codigo Modificado</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="c++"><span class="preprocessor">#include</span> <span class="include"><iostream></span>
<span class="preprocessor">#include</span> <span class="include"><opencv2/opencv.hpp></span>
<span class="directive">using</span> <span class="keyword">namespace</span> std;
<span class="directive">using</span> <span class="keyword">namespace</span> cv;
<span class="predefined-type">int</span> main(<span class="predefined-type">int</span> argc, <span class="predefined-type">char</span>** argv){
Mat image, mask;
<span class="predefined-type">int</span> width, height;
<span class="predefined-type">int</span> nobjects;
CvPoint p;
image = imread(<span class="string"><span class="delimiter">"</span><span class="content">abc.png</span><span class="delimiter">"</span></span>,CV_LOAD_IMAGE_GRAYSCALE);
<span class="keyword">if</span>(!image.data){
std::cout << <span class="string"><span class="delimiter">"</span><span class="content">imagem nao carregou corretamente</span><span class="char">\n</span><span class="delimiter">"</span></span>;
<span class="keyword">return</span>(-<span class="integer">1</span>);
}
width=image.size().width;
height=image.size().height;
p.x=<span class="integer">0</span>;
p.y=<span class="integer">0</span>;
<span class="comment">// busca objetos com buracos presentes</span>
nobjects=<span class="integer">0</span>;
<span class="keyword">for</span>(<span class="predefined-type">int</span> i=<span class="integer">0</span>; i<height; i++){
<span class="keyword">for</span>(<span class="predefined-type">int</span> j=<span class="integer">0</span>; j<width; j++){
<span class="keyword">if</span>(image.at<uchar>(i,j) == <span class="integer">255</span>){
<span class="comment">// achou um objeto</span>
nobjects++;
p.x=j;
p.y=i;
floodFill(image,p,<span class="integer">50</span>);
<span class="comment">// foi trocado floodFill(image,p,nobjects);</span>
}
}
}
cout << <span class="string"><span class="delimiter">"</span><span class="content">Numero de objetos : </span><span class="delimiter">"</span></span><< nobjects << endl;
imshow(<span class="string"><span class="delimiter">"</span><span class="content">image</span><span class="delimiter">"</span></span>, image);
imwrite(<span class="string"><span class="delimiter">"</span><span class="content">labeling.png</span><span class="delimiter">"</span></span>, image);
waitKey();
<span class="keyword">return</span> <span class="integer">0</span>;
}</code></pre>
</div>
</div>
<div class="paragraph">
<div class="title">Imagem Original</div>
<p><span class="image"><img src="ContaObjeto//abc.png" alt="abc"></span></p>
</div>
<div class="paragraph">
<div class="title">Resultado</div>
<p><span class="image"><img src="ContaObjeto//resultado.png" alt="resultado"></span></p>
</div>
</div>
<div class="sect2">
<h3 id="_contando_objetos_com_buracos">Contando objetos com buracos</h3>
<div class="paragraph">
<p>Aprimoração do algoritmo de contagem apresentado para identificar regiões com ou sem buracos internos. Assumindo que objetos com mais de um buraco podem existir. Incluindo suporte no seu algoritmo para não contar bolhas que tocam as bordas da imagem.</p>
</div>
<div class="listingblock">
<div class="title">O Codigo</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="c++"><span class="preprocessor">#include</span> <span class="include"><iostream></span>
<span class="preprocessor">#include</span> <span class="include"><opencv2/opencv.hpp></span>
<span class="directive">using</span> <span class="keyword">namespace</span> std;
<span class="directive">using</span> <span class="keyword">namespace</span> cv;
<span class="predefined-type">int</span> main(<span class="predefined-type">int</span> argc, <span class="predefined-type">char</span>** argv)
{
Mat image, mask;
<span class="predefined-type">int</span> width, height;
<span class="predefined-type">int</span> nobjects, nobjectshole;
CvPoint p;
image = imread(<span class="string"><span class="delimiter">"</span><span class="content">abc.png</span><span class="delimiter">"</span></span>,CV_LOAD_IMAGE_GRAYSCALE);
<span class="keyword">if</span>(!image.data)
{
std::cout << <span class="string"><span class="delimiter">"</span><span class="content">imagem nao carregou corretamente</span><span class="char">\n</span><span class="delimiter">"</span></span>;
<span class="keyword">return</span>(-<span class="integer">1</span>);
}
width=image.size().width;
height=image.size().height;
p.x=<span class="integer">0</span>;
p.y=<span class="integer">0</span>;
imshow(<span class="string"><span class="delimiter">"</span><span class="content">Original</span><span class="delimiter">"</span></span>, image);
waitKey();
<span class="comment">// busca objetos que tocam na borda e preenchem eles com cor de fundo 0</span>
<span class="keyword">for</span>(<span class="predefined-type">int</span> i=<span class="integer">0</span>; i<width; i++)
{
<span class="keyword">if</span>(image.at<uchar>(<span class="integer">0</span>,i) == <span class="integer">255</span>)
floodFill(image, cvPoint(i,<span class="integer">0</span>), <span class="integer">0</span>);
<span class="keyword">if</span>(image.at<uchar>(height-<span class="integer">1</span>, i) == <span class="integer">255</span>)
floodFill(image, cvPoint(i, height-<span class="integer">1</span>), <span class="integer">0</span>);
}
<span class="keyword">for</span>(<span class="predefined-type">int</span> i=<span class="integer">0</span>; i<height; i++)
{
<span class="keyword">if</span>(image.at<uchar>(i,<span class="integer">0</span>) == <span class="integer">255</span>)
floodFill(image, cvPoint(<span class="integer">0</span>,i), <span class="integer">0</span>);
<span class="keyword">if</span>(image.at<uchar>(i,width-<span class="integer">1</span>) == <span class="integer">255</span>)
floodFill(image, cvPoint(width-<span class="integer">1</span>,i), <span class="integer">0</span>);
}
<span class="comment">// busca todos os objetos</span>
nobjects=<span class="integer">0</span>;
<span class="keyword">for</span>(<span class="predefined-type">int</span> i=<span class="integer">0</span>; i<height; i++)
{
<span class="keyword">for</span>(<span class="predefined-type">int</span> j=<span class="integer">0</span>; j<width; j++)
{
<span class="keyword">if</span>(image.at<uchar>(i,j) == <span class="integer">255</span>)
{
nobjects++;
p.x=j;
p.y=i;
floodFill(image,p,<span class="integer">100</span>);
}
}
}
<span class="comment">// preenche o fundo com outra cor para encontrar os buracos</span>
floodFill(image,cvPoint(<span class="integer">0</span>,<span class="integer">0</span>),<span class="integer">10</span>);
<span class="comment">// acha objetos com buracos</span>
nobjectshole=<span class="integer">0</span>;
<span class="keyword">for</span>(<span class="predefined-type">int</span> i=<span class="integer">0</span>; i<height; i++)
{
<span class="keyword">for</span>(<span class="predefined-type">int</span> j=<span class="integer">0</span>; j<width; j++)
{
<span class="keyword">if</span>(image.at<uchar>(i,j) == <span class="integer">0</span>)
{
p.x=j;
p.y=i;
floodFill(image,p, <span class="integer">10</span>); <span class="comment">// preenche o buraco</span>
<span class="comment">// evita contar objeto com mais de um buraco</span>
<span class="keyword">if</span>(image.at<uchar>(i, j-<span class="integer">1</span>) == <span class="integer">100</span>)
{
nobjectshole++;
<span class="comment">// preenche objeto com buraco de outra cor</span>
floodFill(image,cvPoint(p.x-<span class="integer">1</span>,p.y), <span class="integer">70</span>);
}
}
}
}
cout << <span class="string"><span class="delimiter">"</span><span class="content">Numero de objetos : </span><span class="delimiter">"</span></span> << nobjects << endl
<< <span class="string"><span class="delimiter">"</span><span class="content">Numero de objetos com buraco : </span><span class="delimiter">"</span></span><< nobjectshole << endl
<< <span class="string"><span class="delimiter">"</span><span class="content">Numero de objetos sem buraco : </span><span class="delimiter">"</span></span> << nobjects-nobjectshole << endl;
imshow(<span class="string"><span class="delimiter">"</span><span class="content">final</span><span class="delimiter">"</span></span>, image);
imwrite(<span class="string"><span class="delimiter">"</span><span class="content">labeling.png</span><span class="delimiter">"</span></span>, image);
waitKey();
<span class="keyword">return</span> <span class="integer">0</span>;
}</code></pre>
</div>
</div>
<div class="paragraph">
<div class="title">Resultado</div>
<p><span class="image"><img src="ContaBuraco//resultado.png" alt="resultado"></span>
Para testar o codigo foram criados objetos com mais de um buraco e o programa contou ele apenas uma vez como esperado</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_manipulação_de_histogramas">Manipulação de histogramas</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_equalizador_histograma">Equalizador histograma</h3>
<div class="paragraph">
<p>Utilizando o programa exemplos/histogram.cpp como referência. Implemente um programa equalize.cpp. Este deverá, para cada imagem capturada, realizar a equalização do histogram antes de exibir a imagem.</p>
</div>
<div class="paragraph">
<p>o programa a seguir equaliza os 3 canais de cores RGB individualmente</p>
</div>
<div class="listingblock">
<div class="title">O Codigo</div>
<div class="content">
<pre class="CodeRay highlight"><code data-lang="c++"><span class="preprocessor">#include</span> <span class="include"><iostream></span>
<span class="preprocessor">#include</span> <span class="include"><opencv2/opencv.hpp></span>
<span class="directive">using</span> <span class="keyword">namespace</span> cv;
<span class="directive">using</span> <span class="keyword">namespace</span> std;
<span class="directive">void</span> MostraHist(Mat &image, <span class="predefined-type">bool</span> equaliza= <span class="predefined-constant">false</span>)
{
vector<Mat> planes;
Mat histR, histG, histB;
<span class="predefined-type">int</span> nbins = <span class="integer">256</span>;
<span class="predefined-type">float</span> range[] = {<span class="integer">0</span>, <span class="integer">256</span>};
<span class="directive">const</span> <span class="predefined-type">float</span> *histrange = { range };
<span class="predefined-type">bool</span> uniform = <span class="predefined-constant">true</span>;
<span class="predefined-type">bool</span> acummulate = <span class="predefined-constant">false</span>;
<span class="predefined-type">int</span> histw = nbins, histh = nbins/<span class="integer">2</span>;
Mat histImgR(histh, histw, CV_8UC3, Scalar(<span class="integer">0</span>,<span class="integer">0</span>,<span class="integer">0</span>));
Mat histImgG(histh, histw, CV_8UC3, Scalar(<span class="integer">0</span>,<span class="integer">0</span>,<span class="integer">0</span>));
Mat histImgB(histh, histw, CV_8UC3, Scalar(<span class="integer">0</span>,<span class="integer">0</span>,<span class="integer">0</span>));
split (image, planes);
<span class="keyword">if</span>(equaliza) <span class="comment">// equaliza os 3 planos R G B</span>
{
equalizeHist(planes[<span class="integer">0</span>], planes[<span class="integer">0</span>]);
equalizeHist(planes[<span class="integer">1</span>], planes[<span class="integer">1</span>]);
equalizeHist(planes[<span class="integer">2</span>], planes[<span class="integer">2</span>]);
}
merge(planes, image); <span class="comment">// junta os planos novamente na imagem</span>
calcHist(&planes[<span class="integer">0</span>], <span class="integer">1</span>, <span class="integer">0</span>, Mat(), histR, <span class="integer">1</span>,
&nbins, &histrange,
uniform, acummulate);
calcHist(&planes[<span class="integer">1</span>], <span class="integer">1</span>, <span class="integer">0</span>, Mat(), histG, <span class="integer">1</span>,
&nbins, &histrange,
uniform, acummulate);
calcHist(&planes[<span class="integer">2</span>], <span class="integer">1</span>, <span class="integer">0</span>, Mat(), histB, <span class="integer">1</span>,
&nbins, &histrange,
uniform, acummulate);
normalize(histR, histR, <span class="integer">0</span>, histImgR.rows, NORM_MINMAX, -<span class="integer">1</span>, Mat());
normalize(histG, histG, <span class="integer">0</span>, histImgR.rows, NORM_MINMAX, -<span class="integer">1</span>, Mat());
normalize(histB, histB, <span class="integer">0</span>, histImgR.rows, NORM_MINMAX, -<span class="integer">1</span>, Mat());
histImgR.setTo(Scalar(<span class="integer">0</span>));
histImgG.setTo(Scalar(<span class="integer">0</span>));
histImgB.setTo(Scalar(<span class="integer">0</span>));
<span class="keyword">for</span>(<span class="predefined-type">int</span> i=<span class="integer">0</span>; i<nbins; i++)
{
line(histImgR, Point(i, histh),
Point(i, histh-cvRound(histR.at<<span class="predefined-type">float</span>>(i))),
Scalar(<span class="integer">0</span>, <span class="integer">0</span>, <span class="integer">255</span>), <span class="integer">1</span>, <span class="integer">8</span>, <span class="integer">0</span>);
line(histImgG, Point(i, histh),
Point(i, histh-cvRound(histG.at<<span class="predefined-type">float</span>>(i))),
Scalar(<span class="integer">0</span>, <span class="integer">255</span>, <span class="integer">0</span>), <span class="integer">1</span>, <span class="integer">8</span>, <span class="integer">0</span>);
line(histImgB, Point(i, histh),
Point(i, histh-cvRound(histB.at<<span class="predefined-type">float</span>>(i))),
Scalar(<span class="integer">255</span>, <span class="integer">0</span>, <span class="integer">0</span>), <span class="integer">1</span>, <span class="integer">8</span>, <span class="integer">0</span>);
}
histImgR.copyTo(image(Rect(<span class="integer">0</span>, <span class="integer">0</span>,nbins, histh)));
histImgG.copyTo(image(Rect(<span class="integer">0</span>, histh,nbins, histh)));
histImgB.copyTo(image(Rect(<span class="integer">0</span>, <span class="integer">2</span>*histh,nbins, histh)));
}
<span class="predefined-type">int</span> main(<span class="predefined-type">int</span> argc, <span class="predefined-type">char</span>** argv)
{
Mat image;
<span class="predefined-type">int</span> width, height;
VideoCapture cap;
cap.open(<span class="integer">0</span>);
<span class="keyword">if</span>(!cap.isOpened())
{
cout << <span class="string"><span class="delimiter">"</span><span class="content">cameras indisponiveis</span><span class="delimiter">"</span></span>;
<span class="keyword">return</span> -<span class="integer">1</span>;
}
width = cap.get(CV_CAP_PROP_FRAME_WIDTH);
height = cap.get(CV_CAP_PROP_FRAME_HEIGHT);
cout << <span class="string"><span class="delimiter">"</span><span class="content">largura = </span><span class="delimiter">"</span></span> << width << endl;
cout << <span class="string"><span class="delimiter">"</span><span class="content">altura = </span><span class="delimiter">"</span></span> << height << endl;
<span class="keyword">while</span>(<span class="integer">1</span>)
{
cap >> image;
resize(image, image, Size(<span class="integer">640</span>,<span class="integer">480</span>));
MostraHist(image);
imshow(<span class="string"><span class="delimiter">"</span><span class="content">Original</span><span class="delimiter">"</span></span>, image);
MostraHist(image, <span class="integer">1</span>);
imshow(<span class="string"><span class="delimiter">"</span><span class="content">image</span><span class="delimiter">"</span></span>, image);
<span class="keyword">if</span>(waitKey(<span class="integer">30</span>) >= <span class="integer">0</span>) <span class="keyword">break</span>;
}
<span class="keyword">return</span> <span class="integer">0</span>;
}</code></pre>
</div>
</div>
<div class="paragraph">
<div class="title">Resultado utilizando 64 beans</div>
<p><span class="image"><img src="HistogramaEqualizacao//resultado64beans.png" alt="resultado64beans"></span></p>
</div>
<div class="paragraph">
<div class="title">Resultados utilizando 256 beans</div>
<p><span class="image"><img src="HistogramaEqualizacao//resultado256beans.png" alt="resultado256beans"></span>
<span class="image"><img src="HistogramaEqualizacao//resultado256_2beans.png" alt="resultado256 2beans"></span></p>
</div>
<div class="paragraph">
<p>é possivel obervar a homogeneização do histograma e as cores mais vivas</p>
</div>
</div>
<div class="sect2">
<h3 id="_detecção_de_movimento">Detecção de movimento</h3>
<div class="paragraph">
<p>Utilizando o programa exemplos/histogram.cpp como referência, implemente um programa motiondetector.cpp. Este deverá continuamente calcular o histograma da imagem (apenas uma componente de cor é suficiente) e compará-lo com o último histograma calculado. Quando a diferença entre estes ultrapassar um limiar pré-estabelecido, ative um alarme. Utilize uma função de comparação que julgar conveniente.</p>
</div>
<div class="paragraph">
<p>O programa utiliza apenas o canal R para calcular a diferença do histograma, e a diferença e calculada pela função chi-quadrado \$\sum_{k=1}^{\n} (histR[k]-prevHistR[k])^2/(histR[k])\$</p>
</div>
<div class="listingblock">