| 摘要 |
For keystone correction of the perspective distortion of an image ( 18 ) projected onto a projection surface ( 12 ), an image existing in electronic form is processed by a processing device to reverse the perspective distortion. For this purpose, the processing device, respectively rotates and shifts exactly one image line ( 36 ) at a time, respectively, while the orientation of the other image lines ( 40,42,46 ) is maintained fixed. In addition or alternately, the image lines ( 36,40,42,46 ) of the original electronic image comprise a plurality of partial sections of equal lengths which are differently stretched and/or compressed by the processing device. Subsequently, the image is newly computed under consideration of all of the image lines ( 36,40,42,46 ) and is projected onto a projection surface ( 12 ) by a projector.
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