We have developed a high-intensity, tunable non-collinear optical parametric amplifier (NOPA). This setup uses multiple fused silica (SiO2) plates to generate high-pulse-energy supercontinuum white light as the seed. By employing pump pulses and the seed light for optical parametric amplification, we produce a highly coherent, tunable femtosecond pulsed laser. This approach of leveraging high-pulse-energy white light to boost the NOPA's output energy addresses the increasing demand for enhanced NOPA light sources in ultrafast science and nonlinear optics.
In practical vision systems, due to the limitation of manufacturing technology, charge-coupled device pixel cells are difficult to satisfy the standard square, and the lens inevitably has imaging nonlinearity, which leads to geometric distortion of the image. To ensure the accuracy of subsequent visual processing, it is necessary to correct the image distortion. A non-metric correction method for complete lens distortion using dual-characteristics joint measurement is proposed. We not only considered the influence of the distortion center in the correction process but also constructed a mapping matrix to standardize the pixel cells, thus establishing a complete lens distortion model. Simultaneously, the linear residual function of the dual-characteristics joint measurement was defined according to the geometric constraint between the vanishing point and the straightness. In addition, the distortion model coefficients were determined by nonlinear iterative optimization. Extensive experiment results demonstrated that the proposed method enables effective and accurate lens distortion correction, which is significantly superior to the existing single characteristic measurement distortion correction approach.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.