The Feasibility of Haar Feature-Based Endoscopic Ultrasound Probe Tracking for Implanting Hydrogel Spacer in Radiation Therapy for Pancreatic Cancer

PurposeWe proposed a Haar feature-based method for tracking endoscopic ultrasound (EUS) probe in diagnostic computed tomography (CT) and Magnetic Resonance Imaging (MRI) scans for guiding hydrogel injection without external tracking hardware. This study aimed to assess the feasibility of implementing our method with phantom and patient images.Materials and MethodsOur methods included the pre-simulation section and Haar features extraction steps. Firstly, the simulated EUS set was generated based on anatomic information of interpolated CT/MRI images. Secondly, the efficient Haar features were extracted from simulated EUS images to create a Haar feature dictionary. The relative EUS probe position was estimated by searching the best matched Haar feature vector of the dictionary with Haar feature vector of target EUS images. The utilization of this method was validated using EUS phantom and patient CT/MRI images.ResultsIn the phantom experiment, we showed that our Haar feature-based EUS probe tracking method can find the best matched simulated EUS image from a simulated EUS dictionary which includes 123 simulated images. The errors of all four target points between the real EUS image and the best matched EUS images were within 1 mm. In the patient CT/MRI scans, the best matched simulated EUS image was selected by our method accurately, thereby confirming the probe location. However, when applying our method in MRI images, our method is not always robust due to the low image resolution.ConclusionsOur Haar feature-based method is capable to find the best matched simulated EUS image from the dictionary. We demonstrated the feasibility of our method for tracking EUS probe without external tracking hardware, thereby guiding the hydrogel injection between the head of the pancreas and duodenum.

Artificial neural network technology for lips reading

The paper presents the use of neural networks for the task of automated speech reading by lips articulation. Speech recognition is performed in two stages. First, a face search is performed and the lips area is selected in a separate frame of the video sequence using Haar features. Then the sequence of frames goes to the input of deep learning convolutional and recurrent neural networks for speech viseme recognition. Experimental studies were carried out using independently obtained videos with Russian-speaking speakers.

Face Detection Using Viola Jones Algorithm

Face detection is one of the most widely researched topics in recent times and is at the helm of the computer vision technology. This paper aims to review and study in detail the implementation of Viola Jones algorithm to detect faces in Realtime. Viola Jones algorithm is reviewed first followed by its main steps which include Haar features, integral image and cascading classifiers.

A Real Time Image Processing Bird Repellent System Using Raspberry Pi

Rice is one of the most consumed foods in Nigeria, therefore it’s production should be on the high as to meet the demand for it. Unfortunately, the quantity of rice produced is being affected by pests such as birds on fields and sometimes in storage. Due to the activities of birds, an effective repellent system is required on rice fields. The proposed effective repellent system is made up of hardware components which are the raspberry pi for image processing, the servo motors for rotation of camera for better field of view controlled by Arduino connected to the raspberry pi, a speaker for generating predator sounds to scare birds away and software component consisting of python and Open Cv library for bird feature identification. The model was trained separately using haar features, HOG (Histogram of Oriented Gradients) and LBP (Local Binary Patterns).Haar features resulted in the highest accuracy of 76% while HOG and LBP were, 27% and 72% respectively. Haar trained model was tested with two recorded real time videos with birds, the false positives were fairly low, about 41%. This haar feature trained model can distinguish between birds and other moving objects unlike a motion detection system which detects all moving objects. This proposed system can be improved to have a higher accuracy with a larger data set of positive and negative images. Keywords—Electronic pest repeller Haar cascade classifier, ultrasonic

Pengenalan Pola Bentuk Wajah dengan OpenCV

Pada penelitian ini akan menggunakan module OpenCV pada bahasa pemrograman python untuk mengenali wajah sesorang yang menggunakan Haar Cascades untuk mengenali bentuk wajah dan mata. Tahapan awal menggunakan open source dari intel untuk data wajah dan mata, dipadukan dengan module cascade classifier pada openCV untuk merubah data menjadi pengenalan bentuk wajah dari titik pada wajah yang dianggap sesuai dengan data yang telah disediakan. Banyak dari beberapa sistem pendeteksian wajah menggunakan metode computer vision sebagai metode pendeteksi objek. Metode computer vision dikenal memiliki kecepatan dan keakuratan yang tinggi karena menggabungkan beberapa konsep (Haar Features, Integral Image, AdaBoost, dan Cascade Classifier) menjadi sebuah metode utama untuk mendeteksi objek. Banyak dari sistem deteksi tersebut menggunakan C atau C++ sebagai bahasa pemrograman, dan OpenCV sebagai librari deteksi objek. Hal ini dikarenakan librari OpenCV menerapkan metode computer vision kedalam sistem deteksinya, sehingga memudahkan dalam pembuatan sistem. Penelitian ini bertujuan untuk mengimplementasikan computer vision ke dalam sistem deteksi wajah sederhana dengan memanfaatkan library yang ada pada OpenCV dan memanfaatkan bahasa pemrograman Python sebagai pondasi sistem.

Comparative Study of LBPH and Haar features in Real Time Recognition Under Varying Light Intensities

Face recognition is a commonly used biometric and has a wide range of applications. We used an access control system that integrates face recognition technology. This paper discusses two algorithms that have been used in the face detection, Haar features and Local Binary Patterns Histogram (LBPH). The experimental set up is done in an open environment using OpenCV library. Comparative study has been made between these two algorithms based on parameters like illumination and hit rate. For the testing, the same training set and samples were used.