2 research outputs found
Practical Uses of A Semi-automatic Video Object Extraction System
Object-based technology is important
for computer vision applications including gesture
understanding, image recognition, augmented reality,
etc. However, extracting the shape information of
semantic objects from video sequences is a very
difficult task, since this information is not explicitly
provided within the video data. Therefore, an
application for exttracting the semantic video object
is indispensable and important for many advanced
applications.
An algorithm for semi-automatic video object
extraction system has been developed. The performance
measures of video object extraction system;
including evaluation using ground truth and
error metric is shown, followed by some practical
uses of our video object extraction system.
The principle at the basis of semi-automatic object
extraction technique is the interaction of the user
during some stages of the segmentation process,
whereby the semantic information is provided
directly by the user. After the user provides the initial
segmentation of the semantic video objects, a
tracking mechanism follows its temporal
transformation in the subsequent frames, thus
propagating the semantic information.
Since the tracking tends to introduce boundary
errors, the semantic information can be refreshed by
the user at certain key frame locations in the video
sequence. The tracking mechanism can also operate
in forward or backward direction of the video
sequence.
The performance analysis of the results is described
using single and multiple key frames; Mean Error
and “Last_Error”, and also forward and backward
extraction. To achieve best performance, results from
forward and backward extraction can be merged
Video Object Extraction Berbasis Lvq Menggunakan Metrik Jarak Minkowski Dan Euclidean
Minor stroke merupakan permasalahan penyakit utama di negara
berkembang. Apabila penyakit penyakit minor stroke tidak segera diatasi akan
berakibat lebih parah lagi. Deteksi penyakit minor stroke biasanya seperti Magnetic
Resonance Imaging (MRI), histology, National Institutes of Health Stroke Scale
score (NIHSS) dan Paroxysmal Atrial Fibrillation (PAF). Deteksi penyakit minor
stroke memerlukan proses waktu dan tenaga. Padahal penyakit minor stroke harus
segera ditangani. Supaya tidak berakibat pada kerusakan kognitif yang lebih parah,
maka memerlukan sistem deteksi dan rehabiltas menggunakan video. Untuk tahap
deteksi dan rehabilatas memerlukan proses salah satunya video object extraction.
Penelitian mengenai video object extraction pada kasus minor stroke menggunakan
LVQ telah dilakukan sebelumnya. Namun hasil akurasi maksimal 68.76% pada
K=4.3.
Kami mengusulkan perbaikan penelitian sebelumnya dengan mengganti
merik euclidean dengan minkowski distance pada vector quantization (VQ). Serta
mengukur kecepatan waktu dalam menyelesaikan ekstraksi pada metrik minkowski
dan euclidean distance. Data yang yang dipergunakan menggunakan video orang
terserang penyakit minor stroke. Untuk data pembanding menggunakan data video
claire. Karena hanya memiliki satu video minor stroke saja. Metode yang
dipergunakan dalam ekstraksi video minor stroke dan claire adalah learning vector
quantization (LVQ). Video minor stroke dan claire diuji dengan variasi konstanta
K=0.1 sampai K=5.
Hasil yang diperoleh saat pengujian minor stroke dan claire dengan
perbandingan metrik minkowski dan euclidean distance adalah akurasi sama
sebesar 68.76% pada K=4.3. Hal ini dipengaruhi oleh kualitas video minor stroke
kurang maksimal dan parameter konstanta ekstraksi fitur (K) dan konstanta metrik
minkowski distance (P). Namun untuk hasil akurasi rata-rata pengujian claire
extraction dengan minkowski distance lebih baik daripada metrik euclidean
distance sebesar 72.49%. Sedangkan untuk hasil pengujian kecepatan waktu claire
extraction dengan metrik minkowski distance lebih cepat 52 detik pada K=4.4
daripada euclidean distance.
===============================================================================================
Minor stroke is the main illness in developed countries and should be prevented to avoid further severe injury. In order to prevent the illness, several detection methods have been developed, such as Magnetic Resonance Imaging (MRI), Histology, National Institutes of Health Stroke Scale score (NIHSS) and Paroxysmal Atrial Fibrillation (PAF). It is commonly known that minor stroke detection takes time and energy; thus, efficient video detection and rehabilitation method is required to be able to quickly detect the symptoms with a view to prevent the cognitive impairment. One of the processes in detection and rehabilitation is video object extraction. Some researches about video object extraction for minor stroke using LVQ has been conducted; however, the maximum accuracy achieved was 68.76% with K=4.3.
We propose the use of minkowski distance instead of euclidean in vector quantization (VQ). Here, we measure the time to complete an extraction in minkowski and euclidean distance. Video data from patients with minor stroke is used and video data claire is used for comparison. With only one video minor stroke, a method to extract video minor stroke and claire is Learning Vector Quantization (LVQ). Video minor stroke and claire is tested with constant variant from K=0.1 to K=0.5.
The same accuracy is derived from minor stroke and claire test with minkowski and euclidean matrix distance, namely 68.76% with K=4.3. This result is affected by a poor quality of video minor stroke, constant parameter extraction (K) and constant minkowski distance matrix (P). However, the mean accuracy for claire extraction with minkowski distance test is better than euclidean matrix, namely 72.49%. In addition the time of claire extraction with minkowski distance matrix is 52 seconds faster than euclidean distance with K=4.4