dwt

Cant extract embedded stego message after compression is applied to image?

由 妖精的绣舞 提交于 2019-12-25 04:45:23
问题 I am attempting to extract hidden data that has been hidden using DWT steganograpy.Then, when I apply compression, nothing happening! I have used the following code to compress my .bmp image, but no hidden message is being extracted after compression is applied. I tried running in debugger and it just seems to be jumping to the end of the code, after looping around only once. Any ideas of the problem. Data is extracting fine prior to compression being applied. %%%%%%%%%%%%%%%%%%DECODING%%%%%%

Discrete Wavelet Transform Matlab

由 馋奶兔 提交于 2019-12-21 21:25:35
问题 I am trying to use the functions provided in the Matlab Wavelet Toolbox to create a multi-level discrete wavelet decomposition of an image, extracting the coefficients, manipulating them, and recomposing them back into the image. I tried using a number of functions but none of them seem to do what I need. These are the steps to do this. Use wavedec2 to decompose the image into [C,S]. [C,S] = wavedec2(X,N,Lo_D,Hi_D) I then must use detcoef2 to extract the detail coefficients from [C,S]. [C,S]

Wavelet transform in openCV

由 半腔热情 提交于 2019-12-20 09:01:04
问题 did someone tried to implement DWT in opencv or in C++? I saw older posts on this subject and i didn't find them useful for me, because I need a approximation coefficient and details as a result of wavelet transformation. I tried to add this (http://wavelet2d.sourceforge.net/) to my project but it's not working as well as planned. And this is to simple, because as a result parameters i need approximation coefficient and details: void haar1(float *vec, int n, int w) { int i=0; float *vecp =

Calculating Energy of image frame using DWT in python shows wrong value

由 て烟熏妆下的殇ゞ 提交于 2019-12-12 03:10:03
问题 I want to find the energy of the image frame. This is how I calculated in Matlab. [~,LH,HL,HH] = dwt2(rgb2gray(maskedImage),'db1'); % applying dwt E = HL.^2 + LH.^2 + HH.^2; % Calculating the energy of each pixel. Eframe = sum(sum(E))/(m*n); % m,n row and columns of image. when I programmed in python for the same image, the value of Energy is shown 170 for expected 0.7 where did my program go wrong please suggest #!usr/bin/python import numpy as np import cv2 import pywt im = cv2.cvtColor

Discrete Wavelet Transform Matlab

由 本秂侑毒 提交于 2019-12-04 17:15:53
I am trying to use the functions provided in the Matlab Wavelet Toolbox to create a multi-level discrete wavelet decomposition of an image, extracting the coefficients, manipulating them, and recomposing them back into the image. I tried using a number of functions but none of them seem to do what I need. These are the steps to do this. Use wavedec2 to decompose the image into [C,S]. [C,S] = wavedec2(X,N,Lo_D,Hi_D) I then must use detcoef2 to extract the detail coefficients from [C,S]. [C,S] is the 'wavelet decomposition structure', it does not represent the actual coefficients such as cD, cH,

Wavelet transform in openCV

由 拜拜、爱过 提交于 2019-12-02 17:37:40
did someone tried to implement DWT in opencv or in C++? I saw older posts on this subject and i didn't find them useful for me, because I need a approximation coefficient and details as a result of wavelet transformation. I tried to add this ( http://wavelet2d.sourceforge.net/ ) to my project but it's not working as well as planned. And this is to simple, because as a result parameters i need approximation coefficient and details: void haar1(float *vec, int n, int w) { int i=0; float *vecp = new float[n]; for(i=0;i<n;i++) vecp[i] = 0; w/=2; for(i=0;i<w;i++) { vecp[i] = (vec[2*i] + vec[2*i+1])

Looping and TemplateRepeatIndex in Dreamweaver template

由 不问归期 提交于 2019-12-01 18:02:20
I am having some trouble with accessing variables, here in this case Setvariable. When I go inside loop, variable doesn't exists. Anyone have any insight on this. Appreciate your help Below is my code section in template. Would you please help when you get a chance? Thanks. <!-- TemplateBeginRepeat name="Component.Fields.section" --> @@SetVariable("columnSectionIndex", "${TemplateRepeatIndex}")@@ Inline Value @@GetVariable("columnSectionIndex")@@ Variable value can be accessed <!-- TemplateBeginRepeat name ="Field.links" --> Inside Loop Value @@GetVariable("columnSectionIndex")@@ //Not getting

Looping and TemplateRepeatIndex in Dreamweaver template

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-01 16:09:25
问题 I am having some trouble with accessing variables, here in this case Setvariable. When I go inside loop, variable doesn't exists. Anyone have any insight on this. Appreciate your help Below is my code section in template. Would you please help when you get a chance? Thanks. <!-- TemplateBeginRepeat name="Component.Fields.section" --> @@SetVariable("columnSectionIndex", "${TemplateRepeatIndex}")@@ Inline Value @@GetVariable("columnSectionIndex")@@ Variable value can be accessed <!--
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