We propose a new algorithm for real-time detection and tracking of elliptic patterns suitable real-world robotics applications. The method fits ellipses to each contour in the image frame rejects that do not yield good fit. resulting is lightweight enough be used on robots' resource-limited onboard computers, can deal with lighting variations detect pattern even when view partial. tested an exa...

Topology is the mathematical study of properties of objects which are preserved through deformations, twisting, and stretching. Tearing, however, is not allowed. A square is topologically equivalent to a circle and a circle is topologically equivalent to an ellipse, into which it can be deformed by stretching. In this work, we discuss the properties of ellipses when an ellipse is continuously s...

This paper presents a method of detecting overlapping mango fruits from the complex background image. This research uses image that is obtained from a digital camera. This method is based on pre-processing the input image using the texture analysis to determine the boundary of each overlapping fruits. The image is processed to determine the actual boundary, converted to binary images, and utili...

We address the problem of feature correspondences in images of coplanar ellipses with objective to benefit of robust ellipse fitting algorithm. The main difficulty is the lack of projective invariant points immediately available. Therefore, our key idea is to construct virtual line and point features using the property of tangent invariance under perspective projection. The proposed method requ...

More than a century ago, plant physiologists were aware that plant organs-roots, hypocotyls, shoots, branches, flower stalks-rarely grow in just one direction. The mean growth direction may be maintained for long intervals, but the organ's instantaneous growth direction usually oscillates slowly about that mean. The plant organ tip, as seen from a dista1 viewpoint, describes an ellipse. The axe...

Feature extraction and location of eye are very important in face expression recognition, human-computer interaction, face detection and identification etc. This paper presents a new efficient method for eye location. Firstly, gradient, integral image, and Hough transform are used to obtain location and radius of the pupil. Secondly, CANNY operator and ellipse fitting of direct least square are...