公开(公告)号：WO2002101443A2

公开(公告)日：2002-12-19

申请号：PCT/CA2002/000870

申请日：2002-06-12

Applicant: SILICON OPTIX INC. ,  KARUTA, Bonaventure ,  LEE, Louie

Inventor： KARUTA, Bonaventure ,  LEE, Louie

IPC: G02B27/00

CPC classification number: G06T5/006 ,  G02B27/0025 ,  G03B27/68 ,  G06T3/00 ,  G06T2207/20021 ,  H04N5/74 ,  H04N9/3185 ,  H04N9/3194

Abstract: A system and method for correcting distortion in projected images caused by the projection of an input image by a projector lens onto a projection screen having a surface that is not orthogonal to the projection axis of the projector. Projection parameters including the focal length of the projector lens and the angles that represent the pan, tilt and roll angle of the projector are obtained. Then the projected area and the best viewable rectangular area that fits within said projected area is determined. The distortion is then characterized by using a distortion transformation which corresponds to the transformation that exists between the vertices of the best viewable rectangular area and the corresponding vertices of the projected area. Finally, the distortion transformation is inverted and applied to input image to obtain a distortion free projected image.

Abstract translation: 一种用于校正由投影仪透镜将输入图像投影到具有不与投影仪的投影轴正交的表面的投影屏幕上的投影图像中的失真的系统和方法。 获得投影参数，包括投影镜头的焦距和投影机的平移，倾斜和滚动角度的角度。 然后确定投影区域和适合于所述投影区域内的最佳可视矩形区域。 然后通过使用对应于存在于最佳可视矩形区域的顶点与投影区域的对应顶点之间的变换的失真变换来表征失真。 最后，将失真变换反转并应用于输入图像，以获得无失真的投影图像。

公开(公告)号：WO2008086601A1

公开(公告)日：2008-07-24

申请号：PCT/CA2008/000069

申请日：2008-01-16

Applicant: GENNUM CORPORATION ,  JIA, Yunwei ,  KARUTA, Bonaventure

Inventor： JIA, Yunwei ,  KARUTA, Bonaventure

IPC: H04N5/57 ,  H04N9/64

CPC classification number: H04N5/57 ,  H04N21/4318 ,  H04N21/44008

Abstract: A method for contrast enhancement of a video signal comprises receiving a video signal frame, gathering statistics about the video signal frame, calculating the effective input dynamic range of the video signal frame, calculating the effective output dynamic range of the video signal frame, and constructing a transform to enhance the picture in the video signal frame by mapping the effective input dynamic range to the effective output dynamic range via the transform.

Abstract translation: 视频信号的对比度增强方法包括：接收视频信号帧，收集关于视频信号帧的统计，计算视频信号帧的有效输入动态范围，计算视频信号帧的有效输出动态范围，构建 通过变换将有效输入动态范围映射到有效输出动态范围，来增强视频信号帧中的图像的变换。

公开(公告)号：WO02101443A3

公开(公告)日：2003-07-10

申请号：PCT/CA0200870

申请日：2002-06-12

Applicant: SILICON OPTIX INC ,  KARUTA BONAVENTURE ,  LEE LOUIE

Inventor： KARUTA BONAVENTURE ,  LEE LOUIE

IPC: G02B27/00 ,  G03B27/68 ,  G06T3/00 ,  G06T11/80 ,  H04N5/74 ,  H04N9/31 ,  H04N17/00 ,  G06T5/00

CPC classification number: G06T5/006 ,  G02B27/0025 ,  G03B27/68 ,  G06T3/00 ,  G06T2207/20021 ,  H04N5/74 ,  H04N9/3185 ,  H04N9/3194

Abstract: A system and method for correcting distortion in projected images caused by the projection of an input image by a projector lens onto a projection screen having a surface that is not orthogonal to the projection axis of the projector. Projection parameters including the focal length of the projector lens and the angles that represent the pan, tilt and roll angle of the projector are obtained. Then the projected area and the best viewable rectangular area that fits within said projected area is determined. The distortion is then characterized by using a distortion transformation which corresponds to the transformation that exists between the vertices of the best viewable rectangular area and the corresponding vertices of the projected area. Finally, the distortion transformation is inverted and applied to input image to obtain a distortion free projected image.

Abstract translation: 一种用于校正由投影仪透镜将输入图像投影到具有不与投影仪的投影轴正交的表面的投影屏幕上的投影图像中的失真的系统和方法。 获得投影参数，包括投影镜头的焦距和投影机的平移，倾斜和滚动角度的角度。 然后确定投影区域和适合于所述投影区域内的最佳可视矩形区域。 然后通过使用对应于存在于最佳可视矩形区域的顶点与投影区域的对应顶点之间的变换的失真变换来表征失真。 最后，将失真变换反转并应用于输入图像，以获得无失真的投影图像。