8 research outputs found
An automatic and efficient foreground object extraction scheme
This paper presents a method to differentiate the foreground objects from the
background of a color image. Firstly a color image of any size is input for
processing. The algorithm converts it to a grayscale image. Next we apply canny
edge detector to find the boundary of the foreground object. We concentrate to
find the maximum distance between each boundary pixel column wise and row wise
and we fill the region that is bound by the edges. Thus we are able to extract
the grayscale values of pixels that are in the bounded region and convert the
grayscale image back to original color image containing only the foreground
object
DETEKSI SISI CITRA TOMOGRAFI SINAR – X MENGGUNAKAN OPERATOR LAPLACE
Dari penelitian terdahulu (Supurwoko, 2004) diketahui bahwa citra
tomografi dapat diperoleh dengan menyelesaikan masalah invers. Namun
demikian tampang lintang obyek yang dihasilkan mengalami pengaburan pada sisi
citranya, terutama jika menggunakan berkas sinar – X sejajar. Oleh karena itu
perlu dilakukan pengolahan citra agar citra yang dihasilkan semakin baik dan
pengaburan yang menyebabkan kesalahan analisis dapat dihilangkan.
Pada penelitian ini pengolahan citra yang digunakan adalah deteksi sisi
dengan gradien arah. Sedangkan byek ujinya mempunyai tampang lintang
berbentuk“+” dan “H” dengan jumlah proyeksi 4 untuk berkas X sejajar. Data
proyeksi dilakukan secara simulasi dengan memanfaatkan sifat linieritas interaksi
antara bahan dengan sunar X. Semua proses data dan pengolahannya dilakukan
dengan menggunakan bahasa pemrograman C dengan kompiler Borland C ++ versi
5.
Dari citra hasil yang diperoleh dapat disimpulkan bahwa deteksi sisi
dengan gradien arah dapat digunakan untuk mendeteksi sisi – sisi citra tomografi
dengan baik meskipun belum sempurna. Dengan demikian, deteksi sisi dengan
operator laplace ini merupakan proses pengolahan citra yang sebaiknya digunakan
untuk menganalisa citra tomografi.
Kata kunci : berkas sejajar, citra rekonstruksi, deteksi sisi, operator laplace
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Hybrid imaging and neural networks techniques for processing solar images
YesSolar imaging is currently an active area of research. A fast hybrid system for the automated detection of filaments in solar images is presented in this paper. The system includes three major stages. The central solar region is detected in the first stage using integral projections. Intensity filtering and image enhancement techniques are implemented in the second stage to enhance the quality of detection in the central region. Local detection windows are implemented in the third stage to detect the positions of filaments and to define various sized arrays to contain them. The extracted arrays are fed later to a neural network for verification purposes
DETEKSI SISI CITRA TOMOGRAFI SINAR – X MENGGUNAKAN OPERATOR LAPLACE
ABSTRAK Dari penelitian terdahulu (Supurwoko, 2004) diketahui bahwa citra tomografi dapat diperoleh dengan menyelesaikan masalah invers. Namun demikian tampang lintang obyek yang dihasilkan mengalami pengaburan pada sisi citranya, terutama jika menggunakan berkas sinar – X sejajar. Oleh karena itu perlu dilakukan pengolahan citra agar citra yang dihasilkan semakin baik dan pengaburan yang menyebabkan kesalahan analisis dapat dihilangkan.Pada penelitian ini pengolahan citra yang digunakan adalah deteksi sisi dengan gradien arah. Sedangkan byek ujinya mempunyai tampang lintang berbentuk“+” dan “H” dengan jumlah proyeksi 4 untuk berkas X sejajar. Data proyeksi dilakukan secara simulasi dengan memanfaatkan sifat linieritas interaksi antara bahan dengan sunar X. Semua proses data dan pengolahannya dilakukan dengan menggunakan bahasa pemrograman C dengan kompiler Borland C++ versi 5.Dari citra hasil yang diperoleh dapat disimpulkan bahwa deteksi sisi dengan gradien arah dapat digunakan untuk mendeteksi sisi – sisi citra tomografi dengan baik meskipun belum sempurna. Dengan demikian, deteksi sisi dengan operator laplace ini merupakan proses pengolahan citra yang sebaiknya digunakan untuk menganalisa citra tomografi. Kata kunci :   berkas sejajar, citra rekonstruksi, deteksi sisi, operator laplace
A Fast and Accurate Iris Localization Technique for Healthcare Security System
yesIn the health care systems, a high security level is
required to protect extremely sensitive patient records. The goal
is to provide a secure access to the right records at the right time
with high patient privacy. As the most accurate biometric system,
the iris recognition can play a significant role in healthcare
applications for accurate patient identification. In this paper, the
corner stone towards building a fast and robust iris recognition
system for healthcare applications is addressed, which is known
as iris localization. Iris localization is an essential step for
efficient iris recognition systems. The presence of extraneous
features such as eyelashes, eyelids, pupil and reflection spots
make the correct iris localization challenging. In this paper, an
efficient and automatic method is presented for the inner and
outer iris boundary localization. The inner pupil boundary is
detected after eliminating specular reflections using a
combination of thresholding and morphological operations.
Then, the outer iris boundary is detected using the modified
Circular Hough transform. An efficient preprocessing procedure
is proposed to enhance the iris boundary by applying 2D
Gaussian filter and Histogram equalization processes. In
addition, the pupil’s parameters (e.g. radius and center
coordinates) are employed to reduce the search time of the
Hough transform by discarding the unnecessary edge points
within the iris region. Finally, a robust and fast eyelids detection
algorithm is developed which employs an anisotropic diffusion
filter with Radon transform to fit the upper and lower eyelids
boundaries. The performance of the proposed method is tested
on two databases: CASIA Version 1.0 and SDUMLA-HMT iris
database. The Experimental results demonstrate the efficiency of
the proposed method. Moreover, a comparative study with other
established methods is also carried out
Detection of Closed Regions in Digital Images
Abstract- The aim of this work is to introduce a pre-processing step that can be used to detect objects in computer vision systems. The new technique detects the closed shape objects in the input image and neglects all the irrelevant data regions. The detection process starts by implementing the hit-miss transform to produce a binary noise-free image. Watershed transform followed by a novel detection algorithm is applied next to locate and detect the closed shape objects. The Detection algorithm can handle real-life images in real-time mode; it works well even under noise conditions. Keywords: Hit-Miss transform; Watershed transform; Mosaic images; Detection of objects 1