swt based image resolution enhancement

beenu singh

2013 6 17

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i am performing following operation on lena image but result are noisy one pls suggest.

GRAY =imread(file); %% SWT Wavelet Transform starts for Original image dwtmode('per'); [Lo_D,Hi_D,Lo_R,Hi_R] = wfilters('db9'); [LLS,LHS,HLS,HHS]=swt2(GRAY,1,Lo_D,Hi_D);

%%DWT Wavwlet transform

[LLD,LHD,HLD,HHD]=dwt2(GRAY,Lo_D,Hi_D); % interpolation of high frequencies by 2 LHDI = imresize(LHD,2,'bicubic'); HLDI = imresize(HLD,2,'bicubic'); HHDI = imresize(HHD,2,'bicubic');

ELH = imadd(LHDI,LHS); EHL = imadd(HLDI,HLS); EHH = imadd(HHDI,HHS); scale=4; LLI2 = imresize(GRAY,scale/2,'bicubic'); LHI2 = imresize(ELH,scale/2,'bicubic'); HLI2 = imresize(EHL,scale/2,'bicubic'); HHI2 = imresize(EHH,scale/2,'bicubic');

%%IDWT Wavwlet transform

EnhancedImg = idwt2(LLI2,LHI2,HLI2,HHI2,'db9'); figure; imshow(EnhancedImg,[]); title('Enhanced Image');