Classification using KNN

[CODE title="Classification using KNN"]clc;clear;close all;warning off all;



load HOG_features



% imaqreset;



% vid = videoinput('winvideo', 1, 'YUY2_640x480');

% src = getselectedsource(vid);

% vid.FramesPerTrigger = Inf;

% vid.ReturnedColorspace = 'rgb';

% start(vid);

% preview(vid);



%% Get snapshot and process frame image



% h = msgbox('Show Sign !');

% uiwait(h);

%

% im = getsnapshot(vid);



[f,p] = uigetfile('*.*');

im = imread([p,f]);



imshow(im);



% stop(vid);



cform = makecform('srgb2lab');

J = applycform(im,cform);

K=J,:,2);

L=graythresh(J,:,2));

BW1=im2bw(J,:,2),L);

BW1=bwareaopen(BW1,500);

BB=regionprops(BW1,'Boundingbox');

pause(0.01)



gr = rgb2gray(im);



object = imcrop(gr,BB(1).BoundingBox);

object = imresize(object,[100,50]);

figure(2);imshow(object);



[feat] = hog_feature_vector(object);



class = knnclassify(feat,data,group);



switch class

case 0

tts('Sign of 0');

case 1

tts('Sign of 1');

case 2

tts('Sign of 2');

case 3

tts('Sign of 3');

case 4

tts('Sign of 4');

case 5

tts('Sign of 5');

case 6

tts('Sign of 6');

case 7

tts('Sign of 7');

case 8

tts('Sign of 8');

case 9

tts('Sign of 9');



end



imaqreset[/CODE]

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Bom fórum muito util.

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KNN algorithm is used to classify by finding the K nearest matches in training data and then using the label of closest matches to predict. Traditionally, distance such as euclidean is used to find the closest match

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