A method includes projecting an image onto a projection surface through a projection lens of a projector, where the image comprises a fiducial marker. The method also includes capturing a point cloud of the fiducial marker with a camera, and generating a distortion map of projection lens distortion based at least in part on the point cloud. The method also includes generating a correction map for the projection lens, and applying the correction map to a video signal input to the projector.

A projection system includes a video projector to project images having an image region on a surface having a border area associated with the surface, and a processing system including a graphical processing unit to evaluate the border area and the projected image region, the graphical processing unit to transform the projected image region into an aligned projected image region coinciding with the border area.

A system is disclosed for the automated correction of optical and digital aberrations in a digital imaging system. The system includes several main parts, including (a) digital filters, (b) hardware modifications, (c) digital system corrections, (d) digital system dynamics and (e) network aspects. The system solves numerous problems in still and video photography that are presented in the digital imaging environment.

An image displaying system includes: a display device, a detection device and an image compensating chip. The detection device obtains position information of a view point relative to the display device, and an angle of sight line; the image compensating chip divides equally the image to be displayed into a plurality of first sub-images along a first reference direction, calculates a compensation ratio along the first reference direction for each first sub-image, and compensates each first sub-image along the first reference direction; the first virtual section line segment has two endpoints located on the frame of the display device, is extended along the first reference direction, and passes through an intersection of the sight line and the display device; the display device displays the compensated image, so that the compensated first sub-images are viewed as having the same size along the first reference direction.

An image displaying system includes: a display device, a detection device and an image compensating chip. The detection device obtains position information of a view point relative to the display device, and an angle of sight line; the image compensating chip divides equally the image to be displayed into a plurality of first sub-images along a first reference direction, calculates a compensation ratio along the first reference direction for each first sub-image, and compensates each first sub-image along the first reference direction; the first virtual section line segment has two endpoints located on the frame of the display device, is extended along the first reference direction, and passes through an intersection of the sight line and the display device; the display device displays the compensated image, so that the compensated first sub-images are viewed as having the same size along the first reference direction.

The present application discloses a method and an electronic device for switching video display window. The method for switching the video display window includes: acquiring a width-height ratio of a video displayed in a current video display window and a width-height ratio of a target video display window when it is monitored that there is a video display window switching command; contrasting the width-height ratio of the video with the width-height ratio of the target video display window; and adjusting the width-height ratio of the target video display window to the width-height ratio of the video when the width-height ratio of the video is inconsistent with the width-height ratio of the target video display window.

A 2-D scanning system uses a fast-rotating raster-polygon as a single scanning component to produce straight scan lines over a 2-D image surface. An approach angle of incident light beams to the raster-polygon is selected to minimize pin-cushion distortion of scan lines introduced by polygon scanning on the image surface, and a tilt angle of the rotational axis of the raster-polygon is selected to position said polygon-scanning distortion symmetrically on the image surface. In addition, scan optics are configured to generate a predetermined amount of barrel distortion of scan lines on the image surface to compensate for pin-cushion distortion introduced by polygon scanning.

A 2-D scanning system uses a fast-rotating raster-polygon as a single scanning component to produce straight scan lines over a 2-D image surface. An approach angle of incident light beams to the raster-polygon is selected to minimize pin-cushion distortion of scan lines introduced by polygon scanning on the image surface, and a tilt angle of the rotational axis of the raster-polygon is selected to position said polygon-scanning distortion symmetrically on the image surface. In addition, scan optics are configured to generate a predetermined amount of barrel distortion of scan lines on the image surface to compensate for pin-cushion distortion introduced by polygon scanning.

A black stripe detector is configured to detect a black stripe region of an input video signal in which a part of an effective region is a black stripe region, and to generate black stripe information. A keystone correction processor is configured to implement keystone correction processing for the input video signal, and to generate a keystone-corrected video signal. A black stripe information corrector is configured to correct the black stripe information which indicates a corrected black stripe region owned by the keystone correction video signal, to corrected black stripe information based on keystone correction parameters when the keystone correction processor performs keystone correction processing for the input video signal. A video signal processor is configured to implement predetermined video signal processing for the keystone-corrected video signal by using the keystone-corrected video signal and the corrected black stripe information.

An image projection apparatus comprises a projection unit configured to project an image onto a projection plane, a correction unit configured to correct a range of the image projected by the projection unit, a deformation unit configured to deform the projected range of the image according to a designated correction point, and a control unit configured to optically change the projected range of the image projected by the projection unit according to a designation of an outside of a predetermined range as the correction point.