Why am i getting error in wthresh? please help

% Load the noisy image

noisyImage = imread('flower.jpg');

% Convert the noisy image to grayscale

grayImage = rgb2gray(noisyImage);

% Convert the grayscale image to double precision

grayImage = im2double(grayImage);

% Display the original noisy image

figure;

imshow(noisyImage);

title('Noisy Image');

% Perform Coiflet wavelet denoising

% Set the denoising parameters

waveletType = 'coif2'; % Coiflet wavelet type

level = 5; % Wavelet decomposition level

threshold = 'soft'; % Thresholding method

thrSettings = 3; % Thresholding settings

% Perform wavelet decomposition

[C, S] = wavedec2(grayImage, level, waveletType);

% Compute the noise estimate using universal thresholding

sigma = median(abs(C)) / 0.6745;

% Apply the thresholding

C = wthresh(C, threshold, sigma * thrSettings);

% Perform inverse wavelet transform to obtain the denoised image

denoisedImage = waverec2(C, S, waveletType);

% Display the denoised image

figure;

imshow(denoisedImage);

title('Denoised Image');

[Walter Roberson]

x is empty or length 1.

[P N Ridu Varshini]

Thank you Sir!! code in the picture was different ...please do recheck.

Answer 1

[Cris LaPierre]

I believe the issue is with your 2nd input. Valid inputs are 's' and 'h'. You are using 'soft'.

y = linspace(-1,1,100);
thr = 0.4;

% good
ythard = wthresh(y,'s',thr);

% error
ythard = wthresh(y,'soft',thr);

Error using wthresh
Invalid argument value.

[P N Ridu Varshini]

Thank you!!