A new still image watermark embedding algorithm based on fractal transformation

2005 ◽  
Author(s):  
Cao Hua ◽  
Zhou Jingli ◽  
Yu Shengsheng
Keyword(s):  
Still Image ◽  
Image Watermark ◽  
Watermark Embedding

Statistical image watermark decoder based on local frequency-domain Exponent-Fourier moments modeling

2021 ◽  
Author(s):  
Xiang-yang Wang ◽  
Xin Shen ◽  
Jia-lin Tian ◽  
Pan-pan Niu ◽  
Hong-ying Yang
Keyword(s):  
Frequency Domain ◽  
Image Watermark

Anti-Print and Scan Halftone Watermarking Algorithm Based on Edge Detection

2013 ◽  
Vol 416-417 ◽  
pp. 1210-1213
Author(s):  
Hua Wen Ai ◽  
Ping Feng Liu ◽  
Sheng Cong Dong
Keyword(s):  
Edge Detection ◽  
Image Watermarking ◽  
Error Diffusion ◽  
Grayscale Image ◽  
Good Resistance ◽  
Visibility Function ◽  
Gray Image ◽  
Halftone Image ◽  
Watermark Embedding ◽  
Edge Points

In order to resist print and scan attacks, a kind of digital halftone image watermarking algorithm is proposed, which is based on the edge detection and improved error diffusion. The edge of gray image is gotten using canny detection. Calculate the noise visibility function values of the edge points. Then, sort the values in ascending order and select the size that equal to the length of watermark as the location of watermark embedding. While the grayscale image turns to halftone image using the improved error diffusion algorithm, binary watermark is embedded in the edge position. Watermark is pretreated with Arnold before embedding to improve the safety of watermark. Experiment results show that the algorithm is good resistance to print and scan attacks, while resistance to shearing, noise and jpeg compression attacks.

Watermark embedding in optimal color direction

2013 ◽  
Author(s):  
Robert Lyons ◽  
Alastair Reed ◽  
John Stach
Keyword(s):  
Watermark Embedding

Sonar watermark embedding and detection: a sea trial report

2012 ◽  
Author(s):  
Bijan G. Mobasseri ◽  
Nagarjun Chakilam ◽  
Robert S. Lynch
Keyword(s):  
Trial Report ◽  
Sea Trial ◽  
Watermark Embedding

Calibration of Timing Parameters of Still Image Cameras and Video Cameras by a Two Dimensional LED Array

2021 ◽  
Vol 13 (2) ◽  
pp. 23-35
Author(s):  
Hau Wah Lai ◽  
Cho Man Tsui
Keyword(s):  
Circuit Design ◽  
Frequency Standard ◽  
Clock Signal ◽  
Two Dimensional ◽  
Calibration Laboratory ◽  
Still Image ◽  
Video Cameras ◽  
Led Array ◽  
Calibration Methods

This paper presents a t wo-dimensional 10 x 10 LED array system developed in-house at t he Standards and Calibration Laboratory (SCL) for the calibration of timing parameters of still image cameras and video cameras. In this paper, the circuit design and the calibration methods for cameras of different shutter types (rolling shutter or global shutter) are presented. This LED array may also be used to verify the shutter type of cameras. The frequency of the clock signal applied in the calibration is traceable to the SI through the cesium beam frequency standard maintained at SCL.

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