A practical method to detect and correct for lens distortion in the TEM.

A Novel Method for Measuring, Regardless of Image Distortion and Lens Varying Specifications in Endoscopic Treatment of Vesicoureteral Reflux

Wide-Angle Lens Distortion Correction Using Division Models

In this paper we propose a new method to automatically correct wide-angle lens distortion from the distorted lines generated by the projection on the image of 3D straight lines. We have to deal with two major problems: on the one hand, wide-angle lenses produce a strong distortion, which makes the detection of distorted lines a particularly difficult task. On the other hand, the usual single pa...

Change detection from satellite images based on optimal asymmetric thresholding the difference image

As a process to detect changes in land cover by using multi-temporal satellite images, change detection is one of the practical subjects in field of remote sensing. Any progress on this issue increase the accuracy of results as well as facilitating and accelerating the analysis of multi-temporal data and reducing the cost of producing geospatial information. In this study, an unsupervised chang...

رفع اعوجاج هندسی متون به‌کمک اطلاعات هندسی خطوط متن

Document images produced by scanners or digital cameras usually have photometric and geometric distortions. If either of these effects distorts document, recognition of words from such a document image using OCR is subject to errors. In this paper we propose a novel approach to significantly remove geometric distortion from document images. In this method first we extract document lines from do...

A Scale-Preserving Lens Distortion Model and its Application to Image Registration

This paper presents a model for correcting the effects of barrel and pincushion lens distortion that preserves the scale of the captured image. This is significant as the model is able to correct for a practical range of the aforementioned types of lens distortion while maintaining the scale helps minimize the loss of the corrected image’s resolution. The functional inverse of the model is deri...