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An Improved Latent Fingerprints Feature Extraction and Matching Algorithm

Thesis Info

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Author

Muhammad Irfan Arshad

Program

PhD

Institute

University of Engineering and Technology

City

Taxila

Province

Punjab

Country

Pakistan

Thesis Completing Year

2015

Thesis Completion Status

Completed

Subject

Electrical Engineering

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/9951/1/8.%20PhD_Thesis_Irfan_%2809-UET-PhD-EE-37%29.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727699452

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Latentfingerprintsaretheimpressionsofpartialridgesleftonthesurfaceofobjects touched unintentionally at crime scenes and constitute a valuable source of evidence in law enforcement agencies to helpsolve crimes. However,majority of the processing (marking regionof interest(ROI),singularpoints(SP),orientationfieldandminutiaepoints)for latentprintsidentificationisdonemanuallybyforensicexperts.Theexistingmethods involve forensicexpertstomanually markthe featuresin latentandtheninput ittothe systemforautomaticmatchingwithreferenceprints.Thematcherreturnsalistof candidates thatare manuallycheckedbyexperts totake final decision.Thepracticeof manuallymarkingfeaturesinlatentsislaborious,timeconsumingandhumandependent whichmayresultsinwrongidentification.Thereforethereisaneedtoautomatethis process to avoid aforesaidconstraints. This thesis describes an automatedapproach of segmentation andenhancement for latent fingerprints identification.Currently,afew attemptshavebeenmade inthisrespectand still remain a challenging problem due to: (i) poor quality, (ii) small friction ridge area,(iii) presence of non-linear distortion,(iv) blurringor smudging,and(v) complexbackground noise. In this research, an algorithm for automated segmentation of latent fingerprints is proposed. The latent image datais classifiedintoclusters using K-means clustering techniquewhich results in pixels having similar characteristicsto fit in one cluster (foreground) while pixels having opposite characteristicsto other cluster (background).Tophat filtering is appliedto enhance the clustered data and mask is generated on the basis of this enhanced information. Segmentation is achievedby applying thegenerated maskon latent image.The proposed algorithm forsegmentationof latent fingerprintsisautomatedwithout anysortof human involvement.Performanceofproposedalgorithmisevaluatedbycomputingthemissed detection rate (MDR) and false detection rate (FDR) and comparison of proposed method withotherexistingalgorithmsisdone.SimulationresultsonNISTSD-27(databaseof latentfingerprintimagescontaining258latentfingerprintsalongwiththeirmatedrolled prints)showsignificantperformanceenhancementofproposedmethodhavingaverage MDR and FDR of 4.77% and 26.06% respectively. Furthermore, subjective comparison is made usingvisual segmentation reliability(VSR)which istheratioof intersectional area ofautomated and ground truthlatent to manually marked segmented latent. VSR approaches to 90% for good quality images, 70-80% for bad quality images and 50-60% for ugly qualityimages.Matchingperformance isimprovedwhen thesegmentedinputis applied to commercial-off-the-shelf(COTS tenprint)matcherascompared with un- segmentedinput. Another contribution of proposed research is towards the enhancement of latent fingerprints. Enhancement of segmented latent isperformed using Gabor filter bank. It has five image-dependent-parameterslikeorientation ∅ ,standarddeviations ?�and ?�ofthe Gaussian function,timeperiodTandthe convolutionmasksize.Theselectionof these parametersplaysacrucial roleinfingerprintenhancementspecificallytheorientation∅ andstandarddeviation ?� and ?� .Thelatentimageis dividedintoblocks of WxW centered at pixel (i,j)and gradients ��� and ��� along x-axis andy-axis are computedby applying Sobel operator at everypixel.Orientation ∅ is computedon the basis ofthese computed gradients. Ridge frequency F(i, j) is estimated by calculating the grey level value of each pixel, housed in the block, and is projected in a direction perpendicular to the local ridgeorientationandridgespacingS(i,j).Animprovementinfrequencyestimationis achievedbyintroducingGaussianlowpassfilterthatminimizesthenoiselevels.Ridge orientation ∅ and frequency F(i, j) is used to design an even-symmetric Gabor filter. Spatial convolution of thelatentfingerprint withGaborfilter isperformedtogenerateenhanced latentimage.SimulationresultsonNISTSD-27showthatimprovementinmatchingis increased 11% in comparison toautomatedlatent fingerprint segmentation and enhancementalgorithmby Zhang et al in 2013.
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تاہنگ وصل دی

تاہنگ وصل دی
دیس ماہی دے جانا میرا ہویا بہت ضروری اے
مکھ دلبر دا تکنا ای تکنا ایہہ میری مجبوری اے
ساون وانگوں برسن اکھیاں
وچ اڈیکاں سوں نہ سکیاں
جنھاں یار دیاں تاہنگاں رکھیاں
اوہ رہندیاں وچ حضوری اے
دیس ماہی دے جانا میرا ہویا بہت ضروری اے
مکھ دلبر دا تکنا ای تکنا ایہہ میری مجبوری اے
دل دا سودا کرے نہ کوئی
کرے جو موتوں ڈرے نہ سوئی
شاہ منصور دے نال جو ہوئی
عشقے دی مجبوری اے
دیس ماہی دے جانا میرا ہویا بہت ضروری اے
مکھ دلبر دا تکنا ای تکنا ایہہ میری مجبوری اے

جس دل عشق حضوری آوے
محبوباں دے دل نوں بھاوے
کدھرے وی اوہ چین نہ پاوے
رہندا وچ صبوری اے
دیس ماہی دے جانا میرا ہویا بہت ضروری اے
مکھ دلبر دا تکنا ای تکنا ایہہ میری مجبوری اے
شرع شریف نوں جو اپناندے
جگ وچ کوئی نہ تُل انہاندے
اسیں ویں یار مدینے جاندے
جے ہووے منظوری اے
دیس ماہی دے جانا میرا ہویا بہت ضروری اے
مکھ دلبر دا تکنا ای تکنا ایہہ میری مجبوری اے
قادریؔ! توں نہ یاد بھلاویں
دلبر توں نہ مکھ پرتاویں
جان منگے تاں دیر نہ لاویں
پھڑ چال چلن منصوری اے
دیس ماہی دے جانا میرا ہویا بہت ضروری اے
مکھ دلبر دا تکنا ای تکنا ایہہ میری مجبوری اے

سیرت النبی ﷺ میں احتسابی عمل کی مثالیں: وفاقی محتسب پاکستان کے فرائض کا اختصاصی مطالعہ

In any society, the administration has the status of a pillar, and its good or bad move directly impacts society. There are institutions to compensate public complaints on government initiatives in many countries of the world that keep check on government administrations. For this purpose "Federal Ombudsman" was established in Pakistan. The main responsibilities of this institution include the execution to enjoin the right and forbid the wrong (Amr bil Ma’rūf wal Nahi ‘An al Munkar), monitoring government employees in administrative matters, hearing the complaints of the public against organizations and preventing them from violating individual rights. In this article, it has been reviewed that how we can seek guidance from the Sīrah of the Prophet (P.B.U.H) is in this matter, to evaluate the present system of "Federal Ombudsman". In addition, the main responsibilities of the "Federal Ombudsman" were discussed in the article. In conclusion recommendations have been made for further improvement.

The Image of Colonized Muslim in Postcolonial Novel: A Comparative Study of E. M. Forster, Ahmad Ali, and Qurat-Ul-Ain Haider

The research investigates the nature and form of the colonial encounter in colonial and postcolonial fiction in the Subcontinent. The colonial fiction develops the stereotypes of the colonized whereas these stereotypes are challenged by the postcolonial counter-discourse. The representation of the colonized Muslim in India in the colonial discourse is a stereotype which is a jumble of fact and fiction. The identity of the colonized Muslim is established in the counter-discourse by the Muslim fiction writers in the Subcontinent. Their representation of the colonized Muslim counters the representation of the colonial discourse. The focus of the research is to draw a comparison between the two representations to investigate the nature of colonial encounter between the West and the Indian Muslims. Situated in the postcolonial theoretical perspective, the researcher has analyzed the novels of E. M. Forster, Ahmad Ali and Qurratulain Hyder to understand the identity of the colonized Muslims in the Subcontinent. Chapter one sets out the nature and the scope of the work, explaining the purpose of examining the representation of the colonized Muslims in the postcolonial novel, and outlining the theoretical context and the orientation of the study. The theoretical framework of the research and the methodology are also explained. The method of the investigation in this research has been a combination of the narrative analysis and the critical discourse analysis. Chapter two explores the postcolonial perspective of the research explaining the issues in the postcolonial theory regarding the identity of the colonized people. In this regard the various models of the postcolonial literature are discussed. Chapter three describes and interprets the text of A Passage to India to explore the stereotypes of the colonized Muslims in the colonial discourse. Chapter four and five describe and interpret the texts of Twilight in Delhi and River of Fire respectively, to explore the modes of writing back the colonial discourse in the postcolonial counter-discourse. Chapter six compares the representation of the colonized Muslims in the three novels and draws conclusions. The identity of the colonized Muslims appears to be discursively constructed, multilayered and polyphonic, and dialogically constructed in the power struggle in the colonial world.