Can anyone combined these operations for a gray scale image?

Question

Haseeb Hassan 2018-4-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/396989-can-anyone-combined-these-operations-for-a-gray-scale-image

评论： Haseeb Hassan 2018-4-30

采纳的回答： KALYAN ACHARJYA

Step1-A grayscale image--->DWT
Step2-Grayscale Image--->Apply Canny Edge Detector
Step3-Combined step2 & step1 to make a Defocus Image

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Haseeb Hassan 2018-4-24

在 MATLAB Online 中打开

 (1) 2D wavelet transformation  to get binary image
 (2) Canny edge detection to get  binary image.
 (3)Perform logic AND for the images to produce defocus image.

 The Following Code is here i have so far used:

clear all ; close all
lx = imread('C:\Users\Haseeb\Desktop\images\capture.jpg');
%figure; imshow(lx);

x = rgb2gray(lx);
figure
imshow(x)
%% Applying Low Pass and High Pass Filter on the Gray Scale Image
[xar,xhr,xvr,xdr] = dwt2(x,'haar');
xa= xar ; 
xh= xhr ; 
xv= xvr ; 
xd= xdr ;
figure, imshow(xa/255) ;
%figure, imshow(xh) ;
%figure, imshow(xv) ;
%figure, imshow(xd) ;
%% To get the window in standarized Form

X1 = [xa*0.003 log10(xv)*0.3 ; log10(xh)*0.3 log10(xd)*0.3] ;
figure ; imshow(X1)
%% Agian applying db2 to the subsampled Avg Approximationation Image, 
Vertical,horizontal details and diagonal details.
[xaar,xhhr,xvvr,xddr] = dwt2(xa,'haar');
xaa= xaar ; 
xhh= xhhr ;
xvv= xvvr ; 
xdd= xddr ;
figure,imshow(xaa/255);
%figure,imshow(xhh);
%figure,imshow(xvv);
%figure,imshow(xdd);
X11 = [ xaa*0.001 log10(xvv)*0.3 ; log10(xhh)*0.3 log10(xdd)*0.3 ] ;
figure; imshow(X11)

[r,c,s] = size(xv);
figure ; imshow([X11(1:r,1:c,:) xv*0.05 ; xh*0.05 xd*0.05 ])
%% Applying Canny Edge Detector

BW1 = edge(x,'Canny');
imshow(BW1)

Haseeb Hassan 2018-4-25

编辑：Image Analyst 2018-4-26

在 MATLAB Online 中打开

%%Apply DWT
dwt_image=dwt2(x,'haar');
dwt_im2=imresize(dwt_image,[rows colm]);
gray_im=im2bw(dwt_im2);
figure ;imshow(gray_im);
%%Applying Canny Edge Detector
BW1=edge(x,'Canny');
result=and(gray_im,BW1);

As from your code after getting wavelet transform you assigned this matrix to gray_im matrix and then you concatenated these two matrices by AND operator and on other side we just apply simple canny edge detector to our input image but in both cases the result image is same. The first question is why you convert the wavelet transform matrix to binary image and if you applied after comparison with our output image (by applying simple canny edge detector) are same.

KALYAN ACHARJYA 2018-4-26

Just for comparison purpose only. I followed the steps as per your questions.

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Answer 1

KALYAN ACHARJYA 2018-4-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/396989-can-anyone-combined-these-operations-for-a-gray-scale-image#answer_316908

在 MATLAB Online 中打开

%I tried as per your statement flow-here it is, but did not find any sense of defocus. 
%Result is binary image.
lx=imread('1.jpg');
x=rgb2gray(lx);
[rows colm]=size(x);
%%Apply DWT
dwt_image=dwt2(x,'haar');
dwt_im2=imresize(dwt_image,[rows colm]);
gray_im=im2bw(dwt_im2);
%%Applying Canny Edge Detector
BW1=edge(x,'Canny');
result=and(gray_im,BW1);
%%Display
binaryImage=uint8(255 * result);
result1=[lx,cat(3, binaryImage, binaryImage, binaryImage)];
imshow(result1);

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Haseeb Hassan 2018-4-30

Okay Sir can you explain me this by code . "2D wavelet transformation of the input image with a specific threshold to produce a binary image". I am confused about the specific threshold where we can use or how we can use the specific threshold in DWT.

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