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Going Beyond the Desktop
Published in Joe Follansbee, Hands-On Guide to Windows Media, 2012
If you choose to customize an encoding session for high-def video, keep these principles in mind: Preserve the aspect ratio of the source video, usually 16:9.Higher bit rates mean better image and sound quality.Match the encoded frame rate to the frame rate of the source video.Keep your target playback device in mind. Unlike standard streaming video files, WMHD files may be played back on a television, which uses interlacing instead of progressive scan. For example, if you’re targeting a TV as the playback device, you may want to skip de-interlacing during the editing process.Maintain the pixel aspect ratio if your source has nonsquare pixels.Choose a key frame rate that suits the content. If your content is talking heads, fewer key frames mean a smaller file size without sacrificing quality. An action movie needs more key frames, because the image changes so much during the timeline.
Give Me Space
Published in Chris Jackson, Flash Cinematic Techniques, 2012
To make matters even more complicated, the pixel aspect ratio is not consistent between video formats. NTSC video uses a non-square pixel that is taller than it is wide. It has a pixel aspect ratio of 1:0.906. PAL is just the opposite. Its pixels are wider than they are tall with a pixel aspect ratio of 1:1.06 (Figure 3.4).
Preparing for Compression
Published in Stefan Richter, Jan Ozer, Hands-On Guide to Flash Video, 2007
Figure 7-10 shows Premiere Pro’s Properties screen for HDV video. The actual resolution (image size) in pixels is 1440×1080, and the pixel aspect ratio is 1.333. Working from what we’ve learned to this point, this means that you stretch each horizontal pixel by 1.333 to display it correctly.
VisionBlender: a tool to efficiently generate computer vision datasets for robotic surgery
Published in Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization, 2021
João Cartucho, Samyakh Tukra, Yunpeng Li, Daniel S. Elson, Stamatia Giannarou
The camera parameters are composed of the camera’s intrinsic and extrinsic parameter matrix. The intrinsic parameter matrix is calculated and stored once, before starting the rendering. Conversely, the extrinsic matrix is stored for every individual animation frame, since the virtual camera may move around the virtual scene between consecutive frames of an animation. The intrinsic matrix is represented by Eq. (3). These values are calculated, taking into account the focal length, sensor size, sensor fit, horizontal/vertical shift, and the rendered image resolution and pixel aspect ratio of Blender’s virtual camera. In Blender, there is no skew and no distortion on the rendered image.
Flow measurement for the pre-stage of jet pipe servo valve using 2D -PIV technique
Published in International Journal of Fluid Power, 2018
Jianjun Hu, Zehe Yang, Zeng Huang, Yaolan Jin, Bin Yu, Xiangdong Kong
In the experiment, the flow field in the pre-stage symmetry plane of the jet pipe valve was measured. When the deflection angle of the jet tube is 0°, the pre-stage of jet pipe servo valve is symmetrical structure, so the PIV system measured one side (left half region) flow field. To obtain high-quality images, taking into account the size of the model and the camera’s pixel aspect ratio, the flow field of the pre-stage is divided into two major regions for experiment analysis by PIV, the experimental measurement regions are shown in Figure 4. The original images of PIV are shown in Figure 5.
3D temperature mapping of a ceramic shell mould in investment casting process via infrared thermography
Published in Quantitative InfraRed Thermography Journal, 2020
Carlo Salvatore Greco, Gerardo Paolillo, Mattia Contino, Ciro Caramiello, Michele Di Foggia, Gennaro Cardone
where ξ is pixel aspect ratio and , a matrix concerning the transformation from WF to CF, is composed of: a pure rotation defined by the three Euler angles ω, φ, and κ and a translation defined by t = [tx,ty,tz]T.