Numerical Analysis, Books A La Carte Edition (3rd Edition)
3rd Edition
ISBN: 9780134697338
Author: Timothy Sauer
Publisher: PEARSON
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Chapter 11.2, Problem 3CP
Obtain a grayscale image file of your choice, and use the imread command to import into MATLAB. Crop the resulting matrix so that each dimension is a multiple of 8. If necessary, converting a color RGB image to gray scale can be accomplished by the standard formula (11.15).
a. Extract an
pixel block, for example, by using the MATLAB command xb=x(81:88, 81:88). Display the block with the imagesc command.
b. Apply the 2D-DCT.
c. Quantize by using linear quantization with
.
d. Reconstruct the block by using the inverse 2D-DCT. and compare with the original. Use commands MATLAB colormap(gray) and imagesc(X [0 255]).
e. Carry out (a)-(d) for all
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Students have asked these similar questions
Problem 11 (a) A tank is discharging water through an orifice at a depth of T
meter below the surface of the water whose area is A m². The
following are the values of a for the corresponding values of A:
A 1.257 1.390
x 1.50 1.65
1.520 1.650 1.809 1.962 2.123 2.295 2.462|2.650
1.80 1.95 2.10 2.25 2.40 2.55 2.70
2.85
Using the formula
-3.0
(0.018)T =
dx.
calculate T, the time in seconds for the level of the water to drop
from 3.0 m to 1.5 m above the orifice.
(b) The velocity of a train which starts from rest is given by the fol-
lowing table, the time being reckoned in minutes from the start
and the speed in km/hour:
| † (minutes) |2|4 6 8 10 12
14 16 18 20
v (km/hr) 16 28.8 40 46.4 51.2 32.0 17.6 8 3.2 0
Estimate approximately the total distance ran in 20 minutes.
-
Let n = 7, let p = 23 and let S be the set of least positive residues mod p of the first (p − 1)/2
multiple of n, i.e.
n mod p, 2n mod p, ...,
p-1
2
-n mod p.
Let T be the subset of S consisting of those residues which exceed p/2.
Find the set T, and hence compute the Legendre symbol (7|23).
23
32
how come?
The first 11 multiples of 7 reduced mod 23 are
7, 14, 21, 5, 12, 19, 3, 10, 17, 1, 8.
The set T is the subset of these residues exceeding
So T = {12, 14, 17, 19, 21}.
By Gauss' lemma (Apostol Theorem 9.6),
(7|23) = (−1)|T| = (−1)5 = −1.
Let n = 7, let p = 23 and let S be the set of least positive residues mod p of the first (p-1)/2
multiple of n, i.e.
n mod p, 2n mod p, ...,
2
p-1
-n mod p.
Let T be the subset of S consisting of those residues which exceed p/2.
Find the set T, and hence compute the Legendre symbol (7|23).
The first 11 multiples of 7 reduced mod 23 are
7, 14, 21, 5, 12, 19, 3, 10, 17, 1, 8.
23
The set T is the subset of these residues exceeding
2°
So T = {12, 14, 17, 19, 21}.
By Gauss' lemma (Apostol Theorem 9.6),
(7|23) = (−1)|T| = (−1)5 = −1.
how come?
Chapter 11 Solutions
Numerical Analysis, Books A La Carte Edition (3rd Edition)
Ch. 11.1 - Use the 22 DCT matrix and Theorem 11.2 to find the...Ch. 11.1 - Prob. 2ECh. 11.1 - Prob. 3ECh. 11.1 - Prob. 4ECh. 11.1 - Prob. 5ECh. 11.1 - (a) Prove the trigonometric formula...Ch. 11.1 - Prob. 7ECh. 11.1 - Plot the data from Exercise 3, along with the DCT...Ch. 11.1 - Plot the data along with the m=4,6, and 8 DCT...Ch. 11.1 - Plot the function f(t), the data points...
Ch. 11.2 - Prob. 1ECh. 11.2 - Prob. 2ECh. 11.2 - Prob. 3ECh. 11.2 - Use the quantization matrix Q=[ 102020100 ] to...Ch. 11.2 - Prob. 1CPCh. 11.2 - Prob. 2CPCh. 11.2 - Obtain a grayscale image file of your choice, and...Ch. 11.2 - Carry out the steps of Computer Problem 3, but...Ch. 11.2 - Obtain a color image file of your choice. Carry...Ch. 11.2 - Prob. 6CPCh. 11.3 - Prob. 1ECh. 11.3 - Prob. 2ECh. 11.3 - Draw a Huffman tree and convert the message,...Ch. 11.3 - Translate the transformed, quantized image...Ch. 11.4 - Prob. 1ECh. 11.4 - Prob. 2ECh. 11.4 - Prob. 3ECh. 11.4 - Prob. 4ECh. 11.4 - Prob. 5ECh. 11.4 - Prob. 6ECh. 11.4 - Prob. 7ECh. 11.4 - Prob. 8ECh. 11.4 - Prob. 9ECh. 11.4 - Prob. 10ECh. 11.4 - Prob. 1CPCh. 11.4 - Prob. 2CPCh. 11.4 - Prob. 1SACh. 11.4 - Prob. 2SACh. 11.4 - Prob. 3SACh. 11.4 - Prob. 4SACh. 11.4 - Prob. 5SACh. 11.4 - Prob. 6SACh. 11.4 - Build two separate subprograms, a coder and a...
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