background and aims. in periapical radiographic technique, the changes will be visible only after considerable deposition or resorption while digital subtraction technique visualizes slight density changes. this study was aimed to compare visualization of density changes in conventional periapical radiographs and digital subtraction technique with or without image enhancement. materials and met...

conclusions bscta is easily accessible, less time consuming, and most importantly, a non-invasive technique for detecting intracranial aneurysms. it is also suitable for patients who have been referred to emergency services. therefore, it can be used in emergency conditions and as a first-line diagnostic method in patients with non-traumatic sah. patients and methods sixty consecutive patients ...

In the paper, a procedure for detecting and tracking vehicles in a roundabout is presented. The image subtraction technique is used, along with geometric and radiometric filters. The problems due to the camera motion and the vehicle images overlapping are discussed. The results of a test regarding a roundabout are presented, in a case with a negligible variation of the background radiometric ch...

the aim of digital subtraction of radiographic images is eliminating the additional shades to increase the resolution and quality of the images. in dentistry, digital subtraction technique can be used for diagnosis of progressive periodontal diseases or evaluation of the amount of jaw bone repair or destruction. in this study, the possibility of digital subtraction with non-expensive techniques...

Most of the algorithms developed for object detection employ a background-subtraction technique which requires heavy computation. In this paper, we present a fast background-subtraction technique which can be readily applied to many existing object detection algorithms. The proposed technique consists of three parts: persistent background-subtraction, background-subtraction with nearby searchin...