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  2. Motions in the time-frequency distribution - Wikipedia

    en.wikipedia.org/wiki/Motions_in_the_time...

    If we want the left image to become the right image, we can use the techniques from above to achieve the requirement. There are several ways to solve this problem, this is one of the possible solutions. First, we apply clockwise rotation of 90 degree by using one of the transform. STFT:

  3. Wikipedia:Preparing images for upload - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Preparing_images...

    An anti-aliased image may use more colours than you notice, because anti-aliasing smooths jagged edges by adding shades of grey where once there was black or white. Anti-aliased black-and-white images usually need to be saved as 16-colour or 256-colour images instead. See the illustration at the right.

  4. Spacetime diagram - Wikipedia

    en.wikipedia.org/wiki/Spacetime_diagram

    For all these systems both photon world lines represent the angle bisectors of the axes. The more the relative speed approaches the speed of light the more the axes approach the corresponding angle bisector. The axis is always more flat and the time axis more steep than the photon world lines. The scales on both axes are always identical, but ...

  5. Imaginary time - Wikipedia

    en.wikipedia.org/wiki/Imaginary_time

    Imaginary time is a mathematical representation of time that appears in some approaches to special relativity and quantum mechanics. It finds uses in certain cosmological theories. Mathematically, imaginary time is real time which has undergone a Wick rotation so that its coordinates are multiplied by the imaginary unit i .

  6. Wikipedia:File upload wizard - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:File_Upload_Wizard

    العربية; অসমীয়া; Azərbaycanca; تۆرکجه; বাংলা; 閩南語 / Bân-lâm-gú; भोजपुरी; Bosanski; ChiShona; Corsu

  7. Wikipedia:Files for upload - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Files_for_upload

    Article to be used on/reason for upload: The image will be used on the Wikipedia article for Brian Williams (Missouri politician). It is an official portrait of Senator Williams for use in his public service biography. Note: The image file (IMG_1187.JPG) is available upon request. Since I am unable to upload it directly, I would appreciate ...

  8. Axis–angle representation - Wikipedia

    en.wikipedia.org/wiki/Axis–angle_representation

    The angle θ and axis unit vector e define a rotation, concisely represented by the rotation vector θe.. In mathematics, the axis–angle representation parameterizes a rotation in a three-dimensional Euclidean space by two quantities: a unit vector e indicating the direction of an axis of rotation, and an angle of rotation θ describing the magnitude and sense (e.g., clockwise) of the ...

  9. List of image-sharing websites - Wikipedia

    en.wikipedia.org/wiki/List_of_image-sharing_websites

    Legend: File formats: the image or video formats allowed for uploading; IPTC support: support for the IPTC image header . Yes - IPTC headers are read upon upload and exposed via the web interface; properties such as captions and keywords are written back to the IPTC header and saved along with the photo when downloading or e-mailing it