Toolbox Wavelets: perform_jp2_rescaling(MW,Jmin,dir) - File Exchange

Code covered by the BSD License

Highlights from
Toolbox Wavelets

Toolox Wavelets - A Toolbox f...
apply_tensorial(x,func_name,f... apply_tensorial - Multimensional application of a 1D function.
clamp(x,a,b)
compute_best_threshold(type, ... compute_best_threshold - oracle estimation of the threshold for denoising
compute_gabor_features(M,opti... compute_gabor_features - compute a set of gabor filtered features
compute_haar_matrix(w,Jmin, o... compute_haar_matrix - compute the haar matrix for a 2D haar transform.
compute_quadrant_selection(j,... compute_quadrant_selection - compute the indices for selecting subband of a wavelet transform.
compute_spline_filter(s,N) compute_spline_filter - compute the spline filter of a wavelete transform
compute_symmetric_conditional... compute_symmetric_conditional_histogram - compute a symmetric histogram
convert_wavelet2vect(x, Jmin,... convert_wavelet2vect - turn wavelet coefficients into a vector
convert_wavelets2list(x, Jmin... convert_wavelets2list - convert a wavelet transform into a cell array.
crop(M,n,c) crop - crop an image to reduce its size
cwpt2_interface(in, direction... function out = cwpt2_interface(in, direction, filter_type, trans_type, btree)
get_lifting_param(type) get_lifting_param - get the parameters of the lifting
getoptions(options, name, v, ... getoptions - retrieve options parameter
histo(mtx, nbins, binCtr)
imageplot(M,str, a,b,c) imageplot - diplay an image and a title
imden=den2d_block(x,qmf,thd,L... wc=FWT2_PO(x,scale,qmf);
jp2_codec(in_data, compressed... this function calls via the compiled function jp2_codec.mexglx
jp2_degrade(Isrc, comp_ratio,... Original jp2k compression/decompression function
jp2codec_degrade(Isrc, comp_r... % Attention: a) no rounding operation; it should be performed beforehand
keep_biggest(x,n) keep_biggest - keep only the n biggest coef,
load_image(type, n, options) load_image - load benchmark images.
load_signal(name, n, options) load_signal - load a 1D signal
perform_79_transform_slow(x, ... perform_79_transform_slow - biorthogonal 7/9 wavelet transform
perform_atrou_transform(x,Jmi... perform_atrou_transform - compute the "a trou" wavelet transform,
perform_blsgsm_denoising(x, o... perform_blsgsm_denoising - denoise an image using BLS-GSM
perform_circle_haar_transform... perform_circle_haar_transform - perform a circle-valued Haar transform.
perform_cpx_dualtree_transfor... perform_cpx_dualtree_transform - perform a complex valued dual-tree wavelet transform
perform_curvelet_transform(x,... perform_curvelet_transform - a wrapper to curvlab
perform_haar_transform_1d(x,d... perform_haar_transform - perform the 1D haar transform along columns
perform_haar_transform_slow(x... perform_haar_transform - compute a wavelet haar transform
perform_histogram_equalizatio... perform_histogram_equalization - perform histogram equalization
perform_histogram_matching_wa... perform_histogram_matching_wavelet - match the histogram of a wavelet transform
perform_image_extension(M,n, ... perform_image_extension - extend the size by symetry
perform_jbig_coding(x) perform_jbig_coding - perform binary image coding
perform_jp2_rescaling(MW,Jmin...
perform_jp2k_compression(x,op... perform_jp2k_compression - compress/decompress an image using JPEG2000
perform_jp2k_degradation(MW,J... perform_jp2k_degradation - perform coding/decoding of wavelet coefficients.
perform_lifting_transform(x, ... perform_lifting_transform - peform fast lifting transform
perform_lifting_transform_byn... perform_lifting_transform_byname - wavelet transform via lifting
perform_lifting_transform_slo... perform_lifting_transform_slow - perform a lifting transform without relying on Mex file
perform_pyramid_transform(x,g... perform_pyramid_transform - fast pyramidal transform (1D or 2D).
perform_pyramid_transform_non... perform_pyramid_transform_nonframe - fast pyramidal transform (1D or 2D).
perform_pyramid_transform_sim... perform_pyramid_transform_simoncelli - Laplacian pyramidal transform
perform_pyramid_transform_ti(... perform_pyramid_transform_ti - gaussian pyramidal transform (1D or 2D).
perform_quantization(x, T, di... perform_quantization - perform a nearly uniform quantization of the signal.
perform_quicunx_wavelet_trans... perform_quicunx_wavelet_transform_ti - translation invariant quincunx wavelets
perform_quincunx_wavelet_tran... perform_quincunx_wavelet_transform - compute quincunx transform
perform_real_dualtree_transfo... perform_real_dualtree_transform - perform a real valued dual-tree wavelet transform
perform_segmentation(E,option... perform_segmentation - perform image segmentation
perform_segmentation_coloriza... perform_segmentation_colorization - return a color image
perform_shannon_estimation_wa... evaluate_nbr_bits_wavelets - evaluate the number of bits to code a wavelet transform
perform_spaciowav_matching(M_... perform_spaciowav_matching - match both the spacial and wavelet histogram
perform_spiht_coding(x,option... perform_spiht_coding - SPIHT coding of wavelet coefficients
perform_steerable_matching(M1... perform_steerable_matching - match multiscale histograms
perform_steerable_transform(x... perform_steerable_transform - steerable pyramidal transform
perform_thresholding(x, t, ty... perform_thresholding - perform hard or soft thresholding
perform_waveatoms_transform(x... perform_waveatoms_transform - interface to WaveAtom transform
perform_wavelet_arithmetic_co... perform_wavelet_arithmetic_coding - arithmetic code a wavelet transformed image.
perform_wavelet_jp2k_coding(x... perform_wavelet_jp2k_coding - code a wavelet transformed image using JPEG2000.
perform_wavelet_matching(M1,M... perform_wavelet_matching - match multiscale histograms
perform_wavelet_transform(x, ... perform_wavelet_transform - wrapper to several wavelet transform.
perform_wavelet_transform_hyp... fwt_hyperbolic - multidimensional hyperbolic (i.e. fully tensorial) wavelet transform
perform_wavelet_transform_irr... perform_irregular_lifting - wavelet for irregular sampling
perform_wavelet_transform_iso... perform_wavelet_transform_isotropic - multidimensional isotropic wavelet transform (aka classical ND transform).
plot_quincunx_wavelet(MW, Jmi... plot_wavelet - plot 2D wavelet transform stored using Mallat's ordering.
plot_wavelet(M, Jmin, options... plot_wavelet - plot 2D wavelet transform stored using Mallat's ordering.
psnr(x,y, vmax) psnr - compute the Peack Signal to Noise Ratio
publish_html(filename, output... publish_html - publish a file to HTML format
reorder_coefs(x, Jmin ,dir) reorder_coefs - reorder the wavelet coefficients.
rescale(x,a,b)
compile_jp2k.m
compile_mex.m
perform_79_transform.m
perform_haar_transform.m
perform_lifting_transform.m
test_atrou.m
test_block_thresholding.m
test_circle_haar.m
test_classical.m
test_compression.m
test_denoising.m
test_denoising_blsgsm.m
test_dualtree.m
test_haar_transform_1d.m
test_j2k.m
test_laplacian_arithmetic_cod...
test_laplacian_do.m
test_laplacian_pyramid.m
test_lifting.m
test_lifting_irregular.m
test_mex.m
test_openjpeg.m
test_pyramidal.m
test_quincunx.m
test_quincunx_ti.m
test_reorder_coefs.m
test_segmentation_gabor.m
test_statistics.m
test_statistics_batch.m
test_steerable.m
test_texture_synthesis_wavele...
test_wavelet.m
test_wavelets_ti.m
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from Toolbox Wavelets by Gabriel Peyre
Wavelet transform and coding functions, including other more exotic transforms (laplacian, steerable

perform_jp2_rescaling(MW,Jmin,dir)

function MW = perform_jp2_rescaling(MW,Jmin,dir)

n = size(MW,1);
Jmax = log2(n)-1;

for j=Jmax:-1:Jmin
    q_min = 1;
    if j==Jmin
        q_min = 0;
    end
    for q=q_min:3
        [selx,sely] = compute_quadrant_selection(j,q);
        MW(selx,sely) = 2^(-(Jmax-j+1)*dir) * MW(selx,sely);
    end
end

Highlights from Toolbox Wavelets

Highlights from
Toolbox Wavelets