Biosignal and Biomedical Image Processing MATLAB-Based Applications Muya phần 4 ppt

... texture image is constructed by taking the regional standard deviation (Figure 12. 14) . After thresholding, this texture-based image is also combined with the other two images. % Example 12 .4 and ... 0 .4. The Ram-Lak reconstruction is not as sharp as the original image and sharpness is reduced further by the cosine filter with its lowered bandwidth. (Original image from the MA...

Ngày tải lên: 23/07/2014, 19:20

... figure. 4. Load the chirp image ( imchirp.tif ) used in Problem 2. Design a one- dimensional 64th-order narrowband bandpass filter with cutoff frequencies of 0.1 and 0.125 Hz and apply it the chirp image. ... rotated image and the original image. ) 9. Load a frame of the MRI image ( mri.tif ) and perform a spatial transfor- mation that first expands the image horizontally b...

Ngày tải lên: 23/07/2014, 19:20

... in pseudocolor by coding the image into green and the inverse of the image into blue. Then take a threshold and plot pixels over 80% maximum as red. 4. Load the image of a cancer cell (from rat ... shape) where I1 and h are image and filter coefficients (or two images, or simply two matrices) to be convolved and shape is an optional argument that controls the size of the ou...

Ngày tải lên: 23/07/2014, 19:20

... proportions D(1,:) = .5*y ؉ .5*x ؉ .1*rand(1,N); D(2,:) = .2*y ؉ .7*x ؉ .1*rand(1,N); D(3,:) = .7*y ؉ .2*x ؉ .1*rand(1,N); D (4, :) = 6*y ؉ 24* x ؉ .2*rand(1,N); D(5,:) = .6* rand(1,N); % Noise only % % Center ... are correlated, and this width is inversely related to the signal bandwidth. Hence, broad- band signals remain correlated for only a few samples and vice versa. TLFeBOOK PCA an...

Ngày tải lên: 23/07/2014, 19:20

... analysis applications only the subband signals are of interest and reconstruction is not needed, but in many wavelet applications, some operation is performed on the subband signals, y lp (n) and y hp (n), ... with a small bandwidth and a p eak a t 10 H z. TLFeBOOK 8 Advanced Signal Processing Techniques: Optimal and Adaptive Filters OPTIMAL SIGNAL PROCESSING: WIENER FILTERS The...

Ngày tải lên: 23/07/2014, 19:20

... time and TLFeBOOK 150 Chapter 6 r xx (τ) = ∫ ∞ −∞ x(t) x(t +τ) dt (4) and r xx (n) = ∑ M k=1 x(k) x(k + n)(5) where τ and n are the shift of the waveform with respect to itself. In the standard ... magnitude and phase of the STFT time–frequency spectrum with the rows encoding the time axis and the columns representing the frequency axis. The optional output arguments, f and t , ar...

Ngày tải lên: 23/07/2014, 19:20

... Example 4. 5 and Figure 4. 13 % Bandstop filter with a passband gain of 1 between 0 and 100, % a stopband gain of -40 db between 300 and 40 0 Hz, % and an upper passband gain of 1 between 500 and fs/2 ... used. Example 4. 5 Design a bandstop filter having the following characteris- tics: a passband gain of 1 (0 db) between 0 and 100, a stopband gain of 40 db between 300 and...

Ngày tải lên: 23/07/2014, 19:20

... construct an impulse func- tion and determine the output using the MATLAB filter routine. % Example 4. 1 and Figures 4. 2 and 4. 3 % Plot the frequency characteristics and impulse response TLFeBOOK Spectral ... output, and b and a are the coefficients of the transfer function in Eq. (4) . Example 4. 1 Find and plot the frequency spectrum and the impulse re- sponse of a dig...

Ngày tải lên: 23/07/2014, 19:20

... box and record the following output: Frequency (Hz): 2 10 20 60 100 125 150 200 300 40 0 V out volts rms: .15×10 −7 0.1×10 −3 0.002 0.2 1.5 3.28 4. 47 4. 97 4. 99 5.0 What is the cutoff frequency and ... used below are presented in Chapter 4. Example 2.2 Generate bandlimited noise and compute and plot the auto- correlation function for two different bandwidths. % Example 2.2 an...

Ngày tải lên: 23/07/2014, 19:20

... 265 Problems 270 10 Fundamentals of Image Processing: MATLAB Image Processing Toolbox 271 Image Processing Basics: MATLAB Image Formats 271 General Image Formats: Image Array Indexing 271 TLFeBOOK TLFeBOOK x ... signal processing and data acqui- sition while Chapter 2 includes topics that are basic to all aspects of signal and image processing. Chapters 3 and 4 c...

Ngày tải lên: 23/07/2014, 19:20