Since the angular deviation produced when shooting a QR code image by a camera would cause geometric distortion of the QR code image, the traditional algorithm of QR code image correction would produce distortion. Therefore this paper puts forward the algorithm which combines corner detection with convex hull algorithm. Firstly, binaryzation of the collected QR code image with uneven light is o...

The inherent strain method is commonly employed to predict part distortion in the additive manufacturing (AM) process simulations. However, mean values are considered which could hinder prediction accuracy. Therefore this paper, variation geometric distortion. In first step, a five layer mesoscale thermo-mechanical model estimate varying each of layers. This serves as an input at level. A compa...

Photometric Stereo can recover dense (at pixel-level) local surface orientation, but the subsequent reconstruction procedures used to obtain 3D shape of the scene are prone to low frequency geometric distortion. This geometric distortion is mainly due to assumption of collimated light source, to overcome the error due to collimated light source we propose a novel calibration process to dynamica...

Watermarking stays the main technical safeguard of electronic copyright. This paper presents the first public-domain oblivious watermarking scheme for images which survives scaling and geometric distortion attacks. Previous proposals are either proprietary, nonoblivious or require scaling or geometric distortion to be undone prior to mark recovery, which may not be practical in oblivious waterm...

The compression of CAD models is a key technology for realizing Internet-based collaborative product development because big model sizes often prohibit us to achieve a rapid product information transmission. Although there exist some algorithms for compressing discrete CAD models, original precise CAD models are focused on in this paper. Here, the characteristics of hierarchical structures in C...