Agus Harjoko

Agus Harjoko
Universitas Gadjah Mada | UGM · Department of Computer Science and Electronics

Ph.D.

About

167
Publications
130,009
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916
Citations
Additional affiliations
March 1987 - present
Universitas Gadjah Mada
Position
  • Laboratory Head

Publications

Publications (167)
Article
An image retrieval system is required to provide high accuracy in a short time. Combining various features will usually increase accuracy but also increase retrieval time. This study developed a CBIR (Content-Based Image Retrieval) method based on hierarchical clustering on low-level features. Low-level features consisting of color, texture, and sh...
Article
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As part of the early warning system, forest fire detection has a critical role in detecting fire in a forest area to prevent damage to forest ecosystems. In this case, the speed of the detection process is the most critical factor to support a fast response by the authorities. Thus, this article proposes a new framework for fire detection based on...
Article
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Red blood cell (RBC) dataset was obtained from four thalassemia peripheral blood smears and a healthy peripheral blood smear. The dataset contains 7108 images of individual red blood cells for nine cell types. The first process is image acquisition, which is the process of retrieving microscopic image data from peripheral blood smears through a Oly...
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This paper presents fire segmentation annotation data on 12 commonly used and publicly available “VisiFire Dataset” videos from http://signal.ee.bilkent.edu.tr/VisiFire/. This annotations dataset was obtained by per-frame, manual hand annotation over the fire region with 2684 total annotated frames. Since this annotation provides per-frame segmenta...
Conference Paper
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Human movement is a direct result of brain commands to muscles. The muscle activity can be analyzed with an electromyograph device and produce a recording in the form of an electromyogram or EMG signal. There are two recording methods, namely intramuscular EMG and surface EMG or sEMG which are easier and more convenient to implement but have lower...
Article
This article investigates the limitations of single image depth prediction (SIDP) under different lighting conditions. Besides that, it also offers a new approach to obtain the ideal condition for SIDP. To satisfy the data requirement, we exploit a photometric stereo dataset consisting of several images of an object under different light properties...
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Single-frame depth prediction is an efficient 3D reconstruction method for one-side artifacts. However, for this purpose, ground truth images, where the pixels are associated with the actual depth, are needed. The small number of publicly accessible datasets is an issue with the restoration of cultural heritage objects. In addition, relief data wit...
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In the automation of vehicle traffic monitoring system, information about the type of vehicle, it is essential because used in the process of further analysis as management of traffic control lights. Currently, calculation of the number of vehicles is still done manually. Computer vision applied to traffic monitoring systems could present data more...
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Batik in Indonesia has various types of patterns, which are arranged repeatedly to illustrate the basic motifs of cloth as a whole. Types of batik motifs collected through several sources such as batik magazines, the internet or directly using a digital camera. Batik’s pattern automatic classification still requires some improvement especially in r...
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This paper presents a robust method to locate a license plate in a complex scene. In contrast to the most existing method which use the non-handcrafted feature to locate the license plate area, our method uses a modified handcrafted feature. We used Maximally Stable Extremal Region (MSER) combining with dominant vertical Sobel to construct essentia...
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Some cases the recording data of Closed Circuit Television (CCTV) is stored for future use. In the long term usage, the files size will grow larger and requiring large storage devices. In some cases, the recorded data not only image with the desired object but also the background images that may be recorded for long periods of time. This cases make...
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Abnormal erythrocytes have diverse shapes. The appearance of specific erythrocyte shapes in a person’s blood can indicate certain diseases, including thalassemia. We used thalassemia peripheral blood smear images and applied a segmentation process to produce single erythrocyte sub-images. Each erythrocyte has a unique shape. The selection of approp...
Article
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: Several diseases can be diagnosed based on the appearance of abnormal erythrocytes, among others anaemia and thalassemia. Process of examination peripheral blood smear manually is time-consuming and subjective. Currently, the process of examination peripheral blood smear by laboratory assistants can be assisted with digital image processing techn...
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Leukemia is a type of cancer that is on white blood cell. This disease are characterized by abundance of abnormal white blood cell called lymphoblast in the bone marrow. Classification of blood cell types, calculation of the ratio of cell types and comparison with normal blood cells can be the subject of diagnosing this disease. The diagnostic proc...
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This research evolves feature extraction algorithms in overcoming difficulties in classifying batik images that encounter changes in scale and rotation. the algorithm is multiscale and multilevel extended centre symmetric local binary pattern (M2ECS-LBP). In utilizing this algorithm using several types of windows to obtain optimal feature extractio...
Article
The satellite requires the support of a robust sub system. On Board Data Handling (OBDH) is the core function of the satellite subsystem and has to be error free in managing the operation of the satellite. It should withstand the harsh environmental conditions in space that has a lot of hazards caused by radiations. In view of these two conditions,...
Chapter
A method to classify Plasmodium malaria disease along with its life stage is presented. The geometry and texture features are used as Plasmodium features for classification. The geometry features are area and perimeters. The texture features are computed from GLCM matrices. The support vector machine (SVM) classifier is employed for classifying the...
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Implementation of automation technology for grading tobacco leaf was very promising. In Indonesia, grading tobacco leaf was done manually and relied on the skill and experience of tobacco leaf graders. Large tobacco plantation needed many graders, and the workers needed to be trained, to become a skilled grader. It would take a long time and substa...
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Objectives The retinal nerve fiber layer (RNFL) is a site of glaucomatous optic neuropathy whose early changes need to be detected because glaucoma is one of the most common causes of blindness. This paper proposes an automated RNFL detection method based on the texture feature by forming a co-occurrence matrix and a backpropagation neural network...
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A complex and detailed Web3D world which represented the physical form of an institution is very difficult to be built. To simplify the work, raster images taken from the real structure were heavily utilized. However, this method has resulted in Web3D sites which were low on detail and having minimum level of realism. To overcome this deficiency, i...
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Manuscript transliteration is generally conducted by reading the manuscript and then writing the results to another piece of paper or storing them on a computer using a specific text-processing program. The procedure of transliteration presupposes that the workers fully understand how to read the manuscript, that no consideration is given to the le...
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In the development of and research into multi-character fighting computer games, Non-Player Characters (NPCs) frequently seem less intelligent owing to them having a single focus. As such, multi-character fighting becomes one-on-one fighting; one character will encounter another character only once the previous opponent is defeated. This study deve...
Article
The presence of peripapillary atrophy (PPA) is associated with two kinds of diseases, namely glaucoma and myopia. PPA is one of the characteristics of these diseases that can be observed through retinal fundus images. We propose an automatic detection method of PPA in retinal fundus images using statistical features and Backpropagation Neural Netwo...
Conference Paper
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Content based Image Retrieval (CBIR) merupakan proses pencarian gambar dengan membandingkan fitur-fitur yang terdapat pada gambar yang dicari dengan gambar yang terdapat dalam basis data. Fitur-fitur low level pada gambar yang biasa digunakan dalam CBIR adalah warna, tekstur, dan bentuk Artikel ini melakukan tinjauan terhadap penelitian-penelitian...
Conference Paper
Acute Myeloid Leukemia (AML) is one of cancer type that attack white blood cells in myeloid descendants. On the clinical examination of leukemia, the number of each blast cell in the laboratory is calculated. However, in some subtype of AML like M4, M5 dan M7 are affected by the same type of precursor cells. The precursor cell of them are myeloblas...
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Stroke is a type of cerebrovascular disease that occurs because blood flow to the brain is disrupted. Examination of stroke accurately using CT scan, but the tool is not always available, so it can be done by the Siriraj Score. Each type of stroke has similar symptoms so doctors should re-examine similar cases prior to diagnosis. The hypothesis of...
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This study proposed a model for determining the movement direction of the object based on the optical flow features. To increase the speed of computational time, optical flow features derived into a Histograms of Oriented Optical Flow (HOOF). We extracted them locally on the grid with a certain size. Moreover, to determine the movement direction we...
Conference Paper
In the automation of traffic monitoring system based on video processing, vehicle detection and tracking is an important rule because it is used for further analysis such as calculating traffic flow. This research aims to implement video processing techniques to detect and track vehicle objects. Detection and tracking stage is done to calculate the...
Conference Paper
Automatic License Plate Recognition (ALPR) implementation can be used in many applications, such as road traffic monitoring, automatic toll payments, and parking management. License plate detection is the first and very critical stage in the ALPR system. Locating the license plate in the image becomes more difficult in the complex backgrounds such...
Conference Paper
The morphological disorder of the red blood cell is one of the indications of a certain type of diseases. On the minor thalassemia, such cases like the erythrocyte having a nucleus, a few number of the fragment cell and the target cell will be seen. This research study aimed at classifying four types of abnormal blood based on the shape, texture, a...
Article
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The main weakness of the k-Nearest Neighbor algorithm in face recognition is calculating the distance and sort all training data on each prediction which can be slow if there are a large number of training instances. This problem can be solved by utilizing the priority k-d tree search to speed up the process of k-NN classification. This paper propo...
Conference Paper
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Features in the classification process have an important role. Classification of batik motif has been done by using various features such as texture features, shape features, and color features. Features can be utilized separately or combined between features. The problem in this research is how to get the potential feature to classified the motif...
Conference Paper
Indonesian Batik has been endorsed as world cultural heritages by UNESCO. The batik consists of various motifs each of whom represents characteristics of each Indonesian province. One of the motifs is called as Batik Kain Besurek or shortly Batik Besurek, originally from Bengkulu Province. This motif constitutes a motif family consisting of five ma...
Conference Paper
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Bali is a world tourism destination with its cultural uniqueness, one of the Balinese cultural products that need to be maintained is the art of Balinese carvings in traditional buildings and sacred buildings, to inherit the culture it needs a management, documentation and dissemination of information by utilizing technology. Digital image processi...
Article
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Guava (Psidium guajava L.) is a fruit that has many health benefits. Guava also has commercial value in Indonesia and has a large market share. This indicates that the commodity of guava has been consumed by society extensively. This time the sorting process is still done manually which still has many shortcomings. This classification gives the cla...
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A compression process is to reduce or compress the size of data while maintaining the quality of information contained therein. This paper presents a survey of research papers discussing improvement of various hybrid compression techniques during the last decade. A hybrid compression technique is a technique combining excellent properties of each g...
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Because there is no a system based on Digital Image Processing to determine the degree of ripeness of Salak Pondoh (Salacca zalacca Gaertner Voss.) on tree, then this study has attempted to implement such a system. System was built with consists of several sub-processes. First, the segmentation process, the system will perform a search of pixels al...
Article
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This research proposes a robust method for disc localization and cup segmentation that incorporates masking to avoid misclassifying areas as well as forming the structure of the cup based on edge detection. Our method has been evaluated using two fundus image datasets, namely: D-I and D-II comprising of 60 and 38 images, respectively. The proposed...
Article
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Batik is a textile with motifs of Indonesian culture which has been recognized by UNESCO as world cultural heritage. Bat ik has many motifs which are classified in various classes of batik. This study aims to combine the features of texture and the feature of shapes' ornament in batik to classify images using artificial neural networks. The value o...
Article
Content-based Image Retrieval (CBIR) is an image search process by comparing the image features sought by the images contained in the database. Low-level features in the image are commonly used in CBIR is the color, texture, and shape. This article conducts a review of journals related to CBIR, particularly research based on low-level features. The...
Article
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There is still a lot of juvenile delinquency in the middle of the community, especially people in urban areas, in the modern era. Juvenile delinquency may be fights, wild racing, gambling, and graffiti on the walls without permission. Vandalized wall is usually done on walls of office buildings and on public or private property. Results from vandal...
Article
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Currently, cases of misuse of intellectual property such as digital image have occurred frequently. Copyright protection needs to be done to reduce the occurrence of cases of misuse of a digital image by an unauthorized person. Watermark image can be used to mark the ownership of a digital image. In this paper, a copyright protection scheme based o...
Article
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The main problem in face recognition system based on half-face pattern is how to anticipate poses and illuminance variations to improve recognition rate. To solve this problem, we can use two lenses on stereo vision camera in face recognition system. Stereo vision camera has left and right lenses that can be used to produce a 2D image of each lens....
Article
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p>The main problem in face recognition system based on half-face pattern is how to anticipate poses and illuminance variations to improve recognition rate. To solve this problem, we can use two lenses on stereo vision camera in face recognition system. Stereo vision camera has left and right lenses that can be used to produce a 2D image of each len...
Article
This paper discusses phonemic syllabification using a pseudo nearest neighbour rule (PNNR) and phonotactic knowledge for Indonesian language. The proposed data-driven model uses a four-feature phoneme encoding and a phonotactic-based pre-syllabification. Evaluating on 50k words dataset using 5-fold cross-validation shows that the proposed encoding...
Article
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The availably of remote sensing image data is numerous now, and with a large amount of data it makes "knowledge gap" in extraction of selected information, especially coastal wetlands. Coastal wetlands provide ecosystem services essential to people and the environment. The aim of this research is to extract coastal wetlands information from satelli...
Article
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Effective music recommendation can decrease listener’s effort in choosing music that will be listened. Music recommendation is not only can be obtained based on genre or audio similarity, because listener’s music choices are also influenced by the listener’s context (mood, occasion, part of day, date, weather, region, month, and weekday). This rese...
Article
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Ongole Crossbreed cattle is the largest cattle in Indonesia. Indonesian consume it’s beef in a large amount. Classification effects beef’s quantity and quality. However, the classification process is measuring manually one by one all this time. Moreover the current standard is too high and inappropriate due to the real exist conditions. Seeing the...
Article
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The traditional procedure of classification of blood cells using a microscope in the laboratory of hematology to obtain information types of blood cells. It has become a cornerstone in the laboratory of hematology to diagnose and monitor hematologic disorders. However, the manual procedure through a series of labory test can take a while. Thresfore...
Conference Paper
Data dimensionality reduction is an important step in the preliminary image classification. Information quantity and resolution of hyperspectral images provide a chance to solve the problem better than multispectral images. In hyperspectral image classification, higher dimensionality of data could improve the capability of class detection as well a...
Conference Paper
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Hematological disorders of leukocytes (white blood corpuscles) are very frequent in medical practices. Each year, the number of new cases of leukemia increased with a high mortality rate what can cause a delay in diagnosis and treatment of leukemia. The hematologist faces difficulty in classifying white blood cells included cancerous leukemia cells...
Thesis
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ABSTRAK Pertumbuhan pengguna layanan mobile data dan mobile internet di Indonesia meningkat pesat dibandingkan voice dan sms. Maraknya penggunaan teknologi mobile semakin membuka peluang besar bagi aplikasi web maupun mobile. Terlebih lagi adanya fase baru dalam berbelanja yakni penggunaan mobile coupon yang memungkinkan konsumen mendapatkan specia...
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One of the dangers that occur at the beach is rip current. Rip current is significant danger for beachgoers. This research tried to serve the geographical information about rip current's occurence risk by using decision tree that built by C4.5 Algorithm. The output from decision tree is rip current's occurrence risk. Case study in this research is...
Article
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Compared with other methods of classifiers such as cellular and molecular biological methods, using the image of the leaves become the first choice in the classification of plants. The leaves can be characterized by shape, color, and texture; The leaves can have a color that varies depending on the season and geographical location. In addition, the...
Conference Paper
Batik is one of the world’s cultural heritages with various decorative patterns. Each batik has its unique pattern characteristic such as color intensity, ornament visualisation and ornament size. Batik with a large-sized ornament and a high-intensity color on its background will result in a clear edge and easy-to-recognise ornaments. While batik w...
Conference Paper
The quadrotor is one kind of Unmanned Aerial Vehicles (UAV). Quadrotor has the ability to hover with minimal translational velocity approaching a stationary state. This capability is supported by the four rotors. These rotors are used to lift the Quadrotor to fly. These rotors are placed on all four sides of the tip of Quadrotor. In order to fly wi...
Article
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Copy-Move Forgery is a special type of image forgery, in which a part of a digital image is copied and pasted to another part in the same image in order to cover an important image feature. This research developed a system to detect copy move forgery in digital image. The system is intended to help the user determine whether an image is authentic o...
Article
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Image processing in the medical world has been developed. One important stage in the processing of this image is segmentation. The accuracy in determining the diagnosis of a disease is determined by the accuracy of the segmentation stage. This study used a dental panoramic radiograph image with the size of 2000x1000 pixels. The area of cortical bon...