From 1960's to 1970's, the Chinese Army built some fortified artificial hills. Some of them are located in the Inner Mongolia, Western China. These large fortresses are surrounded by moats. For some of them it is still possible to see earthworks, trenches and ditches, the planning of which could have a symbolic meaning. We can argue this result form their digital outlining, obtained after an im...

Time stamp superimposed on the video frames can be used as indices for video indexing and retrieval systems. Some applications use it for speed detection of objects. In this paper, we propose a time stamp detection approach based on edge detection method. Furthermore, we apply temporal properties of video frames so that time stamp can be located quickly. We also propose our digit recognition mo...

In order to analyze the moving and deforming of the objects in image sequence, a novel way is presented to analyze the local changes of object edges between two related images (such as two adjacent frames in a video sequence), which is inspired by the physical electromagnetic interaction. The changes of edge between adjacent frames in sequences are analyzed by simulation of virtual current inte...

Article history: Available online 13 November 2009

Line detection algorithms constitute the basis for technical document analysis and recognition. The performance of these algorithms decreases as the quality of the documents degrades. To test the robustness of line detection algorithms under noisy circumstance, we propose a document degradation mode, which simulates noise types that drawings may undergo during their production, storage, photoco...

In this paper, we propose a new rule for the elimination of false edges produced by gradient detectors. This rule is based on the characteristics of the image and the properties of the detector used. The rule has been tested on realistic images using multi-scale edge detectors.

A new scheme for detecting edges and lines in multichannel SAR images is proposed. The line detector is constructed from the edge detector. The latter is based on multivariate statistical hypothesis tests applied to log-intensity SAR images. The raw results are vectorized by a traditional bright line extraction process. The scheme is illustrated by extracting dark linear structures on various f...

In this paper, a morphological-based system for detecting edges in reallife images is presented. The corner stone for this system is the hit-miss transform, which provides good performance in reallife images under noise conditions. The classical implementation of this transform suffers from drawbacks that are tackled in this paper. The new modified hit-miss transform is introduced to provide be...

How to measure the performance of an edge detection method is an open problem. Many performance measures have been presented in the literature. However, there seems to be no agreement on the best option, and there exist no practical studies of the features of some of the most recent measures. In this work we make a comprehensive overview of the different proposals, followed by a practical compa...

The Dilemma of Curve Detection from previous ones in that no attempt is made to match curves directly against the image, or even against measurements (i.e., "curve operators") evaluated over the image. Instead we stress the organizational point that a stable, reliable, but coarse description should be computed as an intermediate between the image (measurements) and the global curves. A particul...