Sökning: "Binarization"

Visar resultat 11 - 15 av 21 uppsatser innehållade ordet Binarization.

  1. 11. Fingerprint image enhancement and minutiae extraction algorithm

    Master-uppsats, Linnéuniversitetet/Institutionen för fysik och elektroteknik (IFE)

    Författare :Letian Cao; Yazhou Wang; [2017]
    Nyckelord :Fingerprints; Minutiae; Algorithm; Simulation; Normalization; Segmentation; Orientation; Extraction; Binarization; Thinning;

    Sammanfattning : This work aims to study the procedures of fingerprint identification system and to present some efficient algorithms for pre-processing and minutiae extraction. Most pre-processing steps consist of normalization, segmentation and orientation estimation, and background which focus on decreasing the variance of fingerprints, separating fore and background areas and tracking the direction of ridge lines, respectively. LÄS MER

  3. 12. Subimage matching in historical documents using SIFT keypoints and clustering

    Master-uppsats,

    Författare :Hampus Åberg; [2015]
    Nyckelord :Handwritten; Image matching; SIFT; Segmentation;

    Sammanfattning : Context: In this thesis subimage matching in historical handwritten documents using SIFT (Scale-Invariant Feature Transform) keypoints was tested. SIFT features are invariant to scale and rotation and have gained a lot of interest in the research community. The historical documents used in this thesis orignates from 16th century and forward. LÄS MER

  4. 13. Building Extraction in 2D Imagery Using Hough Transform

    Kandidat-uppsats, Högskolan i Gävle/Avdelningen för Industriell utveckling, IT och Samhällsbyggnad

    Författare :Rucong Zou; Hong Sun; [2014]
    Nyckelord :Straight line extraction; Binarization; Hough transform; Edge feature; Detecting buildings; ;

    Sammanfattning : The purpose of this paper is to find out whether Hough transform if it is helpful to building extraction or not. This paper is written with the intention to come up with a building extraction algorithm that captures building areas in images as accurately as possible and eliminates background interference information, allowing the extracted contour area to be slightly larger than the building area itself. LÄS MER

  5. 14. Adaptive binarization of 17th century printed text

    Kandidat-uppsats, Institutionen för informationsteknologi

    Författare :Carl Carenwall; [2012]
    Nyckelord :;

    Sammanfattning : This work focused on implementing and evaluating an adaptive water flow model for binarization of historical documents, as presented by Valizadeh and Ehsanollah in an article published in early 2012. While the original method sought an optimal result for all kinds of degraded documents, both on hand written and printed, the work presented here only needed to be concerned with printed documents. LÄS MER

  7. 15. Fingerprint Segmentation

    Master-uppsats, Datateknik

    Författare :Diala Jomaa; [2009]
    Nyckelord :Biometric system; fingerprint Recognition System; Otsu; Split and Merge; Histogram Equalization; mean; variance and coherence;

    Sammanfattning : In this thesis, a new algorithm has been proposed to segment the foreground of the fingerprint from the image under consideration. The algorithm uses three features, mean, variance and coherence. Based on these features, a rule system is built to help the algorithm to efficiently segment the image. LÄS MER