Method and device for phase correction of a vertically distorted digital image
AssigneeMicronas GmbH
InventorsMarko Hahn, Guenther Scheffler, Dirk Wendel
Life of this patent
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Abstract
The invention relates to the phase correction of a vertically distorted digital picture, which is divided into two half pictures in accordance with the interlaced scanning method. To take into account a vertical decimation factor (vscale), which changes in the vertical direction of the digital picture, it is proposed that a phase correction (vphscor) be generated for the second half picture as a function of the particular vertical position in the second half picture. This phase correction must be considered in generating the second half picture. It is derived directly from information (vinc) about the change of the vertical decimation factor.
Claims11
A method for correcting the phase of a vertically distorted digital picture, by which the lines of the digital picture are assigned to a first half picture and to a second half picture in accordance with an imaging factor (vscale) which changes in the vertical direction of the digital picture,
- by which the lines of the first half picture and the lines of the second half picture are displayed successively, and
- by which a phase correction (vphscor) is generated for the second half picture, as a function of the respective vertical position in the second half picture, this phase correction (vpscor) [sic] being taken into account in the generation of the second half picture,
- characterized in that
- the phase correction (vphscor) for the second half picture is derived from information (vinc) about the change of the imaging factor (vscale) in the vertical direction of the digital picture.
A device for correcting the phase of a vertically distorted digital picture,
- with a line determination device (4), to which are conducted the picture data of a digital picture, to assign the lines of the digital picture to a first half picture and to a second half picture in accordance with an imaging factor (vscale), which changes in the vertical direction of the digital picture, such that the lines of the first half picture and the lines of the second half picture are displayed sequentially,
- and with phase correction means (1-3) to generate a phase correction signal (vphase) for the line determination device (4), such that the phase correction signal (vphscor) depends on the specific vertical position in the second half picture and is taken into account by the line determination device (4) when generating the second half picture, characterized in that the phase correction means (1-3) are designed in such a way that they derive the phase correction signal (vphscor) for the second half picture from an increment signal (vinc), which describes the change of the imaging factor (vscale) in the vertical direction of the digital picture.
Dependencies are inferred from the claim text.