Biosignal and Biomedical Image Processing MATLAB-Based Applications Muya phần 7 potx

... image I(22:54,22:52) = .25; % Four squares of different shades I (76 ;106,22:52) = .5; % against a black background I(22:52 ,76 :106) = .75 ; I (76 :106 ,76 :106) = 1; % % Construct projections: Fan and ... angle and distance) in the image. An example of the use of radon to perform the Hough transformation is given in Example 12 .7. Example 12 .7 Find the strongest line in the image...

Ngày tải lên: 23/07/2014, 19:20

... lowpass filter (sigma = 0.5) and the unsharpe filter (alpha = 0.2) are shown below: h unsharp = ͫ −0.16 67 −0.66 67 −0.16 67 −0.66 67 4.3333 −0.66 67 −0.16 67 −0.66 67 −0.16 67 ͬ ; h gaussian = ͫ 0.0113 ... 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

... Load frame 17 of the MRI image (mri.tif) % from the Image Processing Toolbox in subdirectory ‘imdemos’. F IGURE 10 .7 Frame 17 of the MRI image given in Figure 10.5 plotted directly and in pseudocolor ... be 1. For images in RGB format the third index would vary between 1 and 3. TLFeBOOK Fundamentals of Image Processing 2 87 F IGURE 10.5 Montage display of 27 frames of ma...

Ngày tải lên: 23/07/2014, 19:20

... noise s1 = .75 *sin(w*12) ؉ .1*randn(1,N); % Double sin, a sawtooth s2 = sawtooth(w*5,.5)؉ .1*randn(1,N); % and a periodic % function s3 = pulstran((0:999),(0:5)’*180,kaiser(100,3)) ؉ . 07* randn(1,N); % % ... and 20 Hz). The delay of 5 samples and the convergence gain of 0. 075 were determined by trial and error to give the best results with the specified FIR filter length. TLFeBOOK...

Ngày tải lên: 23/07/2014, 19:20

... Example 7. 3. In some 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 ... three-level analysis filter bank. Examine the high frequency subband for evidence of the discontinuity. % Example 7. 5 and Figures 7. 10 and 7. 11. Discontinuity detection % Construc...

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... 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 ... preceded and followed by 0.5 sec of no signal (i.e., zeros). Determine the magnitude of the STFT and plot as both a three-dimensional grid plot and as a contour plot. Do not use the Sig...

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... 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 400 Hz, % and an upper passband gain of 1 between 500 and fs/2 ... 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 400 Hz, and an upper pa...

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... 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 ... Hz and white noise; SNR =−15db. Generate the power spectrum as the square of the magnitude obtained using the Fourier transform. Put the signal generator commands and spectral...

Ngày tải lên: 23/07/2014, 19:20

... Generate bandlimited noise and compute and plot the auto- correlation function for two different bandwidths. % Example 2.2 and Figure 2.8 % Generate colored noise having two different bandwidths % and ... random variable are its mean, or average value, and its variance, the term σ 2 in Eq. (1). The arithmetic quantities of mean and variance are frequently used in signal processin...

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 ... 156 Wigner-Ville Distribution 162 Choi-Williams and Other Distributions 1 67 Problems 172 7 The Wavelet Transform 177 Introduction 177 The Continuous Wavele...

Ngày tải lên: 23/07/2014, 19:20