Lab Manual of DSIP

8/10/2019 Lab Manual of DSIP

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St. Francis Institute of Technology, Mumbai-400 103

A.. !013-!014"lass# $%-ITA&IT$, Semester# 'II

Sub(ect# )igital Signal an* Image +rocessing

%eriment 1# MAT/A$ Intro*uction an* +lotting of $asic *iscrete

Signals. Date: _________

1. Aim: Introduction to MATLAB and Plotting of Basic discrete Signals.

2. RequirementsPC with MatLab .!.".#$ %&'""(a) *ersion or abo*e

3. Pre-Experiment Exercise

+a,iliarit- with MATLAB and stud- of discrete ti,e signals and their

classication

4. Laboratory Exercise

A) Procedure

%a) /0en new ,le.%b) 1rite a 0rogra, code for dis0la-ing discrete ti,e signals such as

2%n)3 u%n)3 r%n)3rising e40onential and decreasing e40onential.%c)5se sub0lot to dis0la- the signals

%d) Sa*e ,le. &un it and obser*e the results%e) Insert title3 legends3 46label and -6label in each gra0h.

. Post-Experiment Exercise

A) !"eory

7) 8laborate on Discrete ti,e signals and classif- the,') 1rite the ,athe,atical denitions of signals studied in the lab

#) $bser%ations:

/bser*e the 0lotted signals w. r. t. their ,athe,atical

re0resentations. &e9ect on what is studied

&) Re'ated (uestions

7) Co,,ent on wh- to use discrete ti,e signals o*er analog signals

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) &onc'usion*&omments

7) Co,,ent on what is 0erfor,ed and results obtained') List down the a00lications %if an-) of the to0ic studied

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"lass# $%-ITA&IT$, Semester# 'II


%eriment !# linear, circular, linear using circular conolution Date:

_________1. Aim: Progra, to i,0le,ent Linear Con*olution3 Circular Con*olution

and Linear Con*olution using Circular Con*olution.

2. Requirements

PC with MatLab .!.".#$ %&'""(a) *ersion or abo*e


Stud- of Discrete ti,e s-ste,s and their classications3 I,0ulse

res0onse and con*olution


A) Procedure

%a) /0en new ,le.

%b) 1rite a 0rogra, code for acce0ting $ 0t. 7D signal arra- fro, userand calculate linear3 circular3 linear using circular and 'D con*olution.

%c) Acce0t user choices at the beginning of 0rogra, such asacce0t


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A) !"eory

7) Dene con*olution

') Sol*e the e4a,0le for in0ut signal entered b- user. and tall-anal-tical results with -our 0rogra, out0ut

#) $bser%ations:

/bser*e the di>erence between the results of circular and linear

con*olution. &e9ect on what is studied.


7) 1hat is the signicance of circular con*olution

') Pro*e that 'D con*olution is se0arable



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Sub(ect# )igital Signal an* Image +rocessing%eriment 3#+! and ,n%erse +!

Date: _________

1. Aim: Progra, to nd Discrete +ourier transfor, and in*erse

Discrete +ourier transfor,.

2. Requirements



Stud- of 7D?'D D+T and ID+T.


Procedure

%a) /0en new ,le.%b) 1rite a 0rogra, code for acce0ting $ 0t. 7D signal arra- fro, user

to calculate 7D D+T %++T function ) and to 0lot Magnitude and 0hases0ectru, of D+T%c) @e4t acce0t two 7D3 $ 0t. signal arra-s fro, user to calculate 7D

ID+T %I++T function ) and to 0lot Magnitude and 0hase s0ectru, ofID+T

%d) Acce0t user choices at the beginning of 0rogra, such asacce0t


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#) $bser%ations:

/bser*e the 0lot of 7D D+T and 76D ID+T. And &e9ect on what is

studied.


7) State and 0ro*e three 0ro0erties of 7D D+T.



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%eriment 4#/inear filtering using FFT base* oerla sae metho*

Date: _________

1. Aim: Progra, to i,0le,ent Linear ltering using ++T based o*erla0

sa*e ,ethod.

2. Requirements



Stud- of o*erla0 sa*e and o*erla0 add ,ethods of linear ltering of

longer signals stud- of con*olution 0ro0ert- of D+T 4%n)h%n)

E%F).G%F)


Procedure

%a) /0en new ,le.%b) 1rite a 0rogra, code for acce0ting two signals fro, user for

con*olution of rst longer 7D signal arra- with another shortersignal arra- with $ sa,0les.

%c) I,0le,ent *e ste0s of o*erla0 sa*e algorith,%d) In ste0 IH of algorith,3 0erfor, circular con*olution of seg,ented

blocFs of long in0ut signal with shorter signal using ++T %use D+Tcon*olution 0ro0ert-)

%e) Sa*e ,le3 run the 0rogra,3 0ro*ide 0ro0er in0uts and obser*e theresults.


A) !"eory

7) List down ste0s in the /*erla0 Sa*e Algorith, for lteringof long signals

') Sol*e the e4a,0le for in0ut signals entered b- user. andtall- anal-tical results with -our 0rogra, out0ut

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#) Co,,ent the 0rogra, code where*er necessar- as 0er-our understanding

#) $bser%ations:

/bser*e the results obtained. &e9ect on what is studied.


7) List down the ste0s in the /*erla0 Add Algorith, forltering of long signals

') Sol*e the e4a,0le taFen in this e40eri,ent using /*erla06Add ,ethod and conr, that -ou get sa,e results.

#) Di>erentiate between /*erla0 Add and /*erla0 Sa*e

,ethods



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%eriment #,mae !ransorms /2 +! and 2 &!)

Date: _________

1. Aim: Progra, to nd forward in*erse D+T and DCT of an I,age.

2. Requirements



Stud- of i,age transfor,s such as discrete fourier %D+T) and

discrete cosine %DCT) transfor,.


Procedure A0

%a) /0en new ,le. and%b) 1rite a 0rogra, code to acce0t user choices at the beginning of

0rogra, such asacce0t


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#0%a) Transfor, the i,age gi*en in the 0art A of the e40eri,ent using

Discrete Cosine Transfor, %


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%eriment 2#iscrete a%e'et !ransorms /!)

Date: _________

1. Aim: Progra, to 0erfor, '6scale D1T of a seKuence and also

0erfor, forward in*erse D1T of an I,age

2. Requirements



Stud- of discrete wa*elet transfor, %DCT) for 76D seKuence and '6D

i,age. Stud- of Gaar transfor,


Procedure A0

%a) /0en new ,le. and%b) 1rite a 0rogra, code to acce0t user choices at the beginning of

0rogra, such as

acce0t


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%f) Sa*e the ,le3 run the 0rogra,3 0ro*ide 0ro0er in0uts and obser*ethe results.

#0%a) Choose the i,age to i,0le,ent Discrete 1a*elet Transfor,%b) +ind 76scale D1T of an i,age using Matlab function %


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%eriment #,mae En"ancement by &ontrast stretc"inmet"od

Date: _________

1. Aim: Progra, to enhance i,age using contrast stretching.

2. Requirements



Stud- of 0oint 0rocessing techniKues %contrast stretching algorith,)

for i,age enhance,ent


Procedure

%a) /0en new ,le.%b) 1rite a 0rogra, code for acce0ting *e *ariables fro, user *iJ.

lower threshold %a)3 u00er threshold %b) and slo0es used in algorith,na,el- al0ha3 beta and ga,,a

%c) Choose the low contrast i,age e.g. Pout.tif3 i,0le,ent the contraststretching algorith, ste0 b- ste0

%d) Dis0la- the original i,age and contrast stretched i,age%e) Sa*e the ,le3 run the 0rogra,3 0ro*ide 0ro0er in0uts and obser*e

the results.%f) Change the *alues of slo0es and thresholds and see the di>erence

in the contrast.


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A) !"eory

7) 1ith neat diagra, deri*e the contrast stretch algorith,') Co,,ent the 0rogra, code where*er necessar- as 0er

-our understanding

#) $bser%ations:



7) 1hat is a need of contrast stretching



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%eriment #arious ,mae En"ancement operations

Date: _________

1. Aim: Progra, to i,0le,ent i,age enhance,ent o0erations.

2. Requirements



Stud- of Digital negati*e3 Thresholding3 Bit 0lane slicing and Median

ltering for i,age enhance,ent


Procedure

%a) /0en new ,le.

%b) Choose the low contrast i,age e.g. Pout.tif %c) 1rite a 0rogra, code to acce0t user choices at thebeginning of 0rogra, such as

acce0t


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%e) If choice


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%eriment 5# Ede detection usin radient $perators

Date: _________

1. Aim: Progra, to nd edges using Prewitt3 Sobel and &oberts

o0erators

2. Requirements



Stud- of I,age seg,entation and edge detection techniKues


Procedure

%a) /0en new ,le.

%b) Choose the i,age Ca,era,an. tif%c) 1rite a 0rogra, code to con*ol*e di>erent ,asFs such as/rdinar-3 &oberts3 Prewitts and Sobel=s

%d) Dis0la- the original i,age along with i,ages showinghoriJontal %4) edges3 *ertical %-) edges and both 46-direction edges

%e) Sa*e the ,le3 run the 0rogra,3 0ro*ide 0ro0er in0utsand obser*e the results.


A) !"eory

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7) Deri*e the radient %ordinar-) o0erator b- taFing rstderi*ati*e of an i,age.

') List down all the ,asFs used in the e40eri,ent#) Co,,ent the 0rogra, code where*er necessar- as 0er

-our understanding

#) $bser%ations:



7) 1hat is 8dge linFing 1h- it is reKuired



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%eriment 10# Ede detection usin Lap'acian5 and L$5

met"od

Date: _________

1. Aim: Progra, to co,0are edge detection with La0lacian and

La0lacian of aussian Lo N o0erators using global Thresholding.

2. Requirements



Stud- of edge detection techniKues using second deri*ati*e of

i,age La0lacian and La0lacian of aussian %L/) ,ethod


Procedure

%a) /0en new ,le.%b) Choose the i,age Ca,era,an.tif %c) 1rite a 0rogra, code to detect edges using


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7) 840lain how L/ ,asF is deri*ed') Co,,ent the 0rogra, code where*er necessar- as 0er

-our understanding

#) $bser%ations:



7) 1h- La0lacian ,asF cannot be used in its original for,Gow to o*erco,e this disad*antage



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%eriment 11#)igital 6atermar7ing an* Steganograhy

Date: _________

1. Aim: Progra, to 0erfor, digital water,arFing Steganogra0h-.

2. Requirements



Stud- of A00lications of I,age Processing such as

water,arFing?Steganogra0h-


Procedure

%a) /0en new ,le.%b) Choose the carrier i,age and a secret %Message) i,age%c) &esiJe the secret i,age to t in carrier i,age

%d) +ind ! bit binar- re0resentation of each 0i4el of a carrier and secreti,age

%e) &e0lace LSB of carrier with MSB of secret i,age to get stego i,age%f) Dis0la- carrier3 secret and stego i,age%g) Perfor, re*erse o0eration to reco*er secret i,age fro, stego i,age%h) Sa*e the ,le3 run the 0rogra,3 0ro*ide 0ro0er in0uts and obser*e

the results.


A) !"eory

7) 840lain the conce0t of Steganogra0h-

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') Co,,ent the 0rogra, code where*er necessar- as 0er-our understanding

#) $bser%ations:



7) 1hat is 1ater,arFing Gow it is related to steganogra0h-


7) Co,,ent on what is 0erfor,ed and results obtained

') List down the a00lications %if an-) of the to0ic studied __________________________

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Lab Manual of DSIP

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