公开(公告)号：US20180336865A1

公开(公告)日：2018-11-22

申请号：US16047768

申请日：2018-07-27

Applicant: STMicroelectronics S.r.l.

Inventor： Filippo NACCARI ,  Mirko GUARNERA ,  Simone Bianco ,  Raimondo Schettini

IPC: G09G5/02 ,  H04N9/67 ,  H04N9/31 ,  G06T7/90 ,  H04N1/60 ,  G09G3/00

CPC classification number: G09G5/02 ,  G06T7/90 ,  G09G3/002 ,  G09G2320/0242 ,  G09G2340/06 ,  H04N1/6088 ,  H04N1/6097 ,  H04N9/3182 ,  H04N9/3194 ,  H04N9/67

Abstract: Color signals to be displayed on a colored display surface and having a first gamut in a color space, are subjected to radiometric compensation. An embodiment includes displaying on the colored surface a set of control points of a known color, acquiring via a camera the control points as displayed on the colored surface and evaluating at least one second color gamut of the control points displayed on the colored surface. The second color gamut(s) is/are misaligned with respect to the first color gamut due to the display surface being a colored surface. The method may also include evaluating as an intersection gamut, the misalignment of the second color gamut(s) with respect to the first color gamut, calculating the color transformation operator(s) as a function of the misalignment evaluated, and applying the color transformation operator(s) to the color signals for display on the colored display surface.

公开(公告)号：US20140168516A1

公开(公告)日：2014-06-19

申请号：US14133381

申请日：2013-12-18

Applicant: STMicroelectronics S.R.L.

Inventor： Filippo NACCARI ,  Angelo BOSCO ,  Mirko GUARNERA

IPC: H04N9/31

CPC classification number: H04N9/3173 ,  H04N9/3182 ,  H04N9/3194 ,  H04N9/67

Abstract: An embodiment relates to a method for converting a digital image from a first color space to a second color space. The first color space is associated with an electronic source device, and the second color space is associated with a projection apparatus of digital images on a screen and coupled to the source device. The method includes: performing a first conversion on a first triad of parameters associated to the first color space by a first conversion matrix to map such a first triad in a third triad of parameters; the third triad is representative of a color space independent from the first and the second color spaces; performing a second conversion on the third triad of parameters by a second conversion matrix to map such a third triad of parameters in a second triad of parameters representative of the second color space. An embodiment of the step of performing the second conversion includes a step of computing the coefficients of the second conversion matrix based on at least one first piece of information representative of a variable distance between the projection apparatus and the screen.

Abstract translation: 实施例涉及将数字图像从第一颜色空间转换为第二颜色空间的方法。 第一颜色空间与电子源设备相关联，并且第二颜色空间与屏幕上的数字图像的投影设备相关联并耦合到源设备。 该方法包括：通过第一转换矩阵对与第一颜色空间相关联的参数的第一三元组执行第一转换，以将第三三元组的参数映射到第一三元组; 第三个三元组代表与第一和第二颜色空间无关的颜色空间; 通过第二转换矩阵在第三三元组参数上执行第二转换，以在表示第二颜色空间的参数的第二三元组中映射这样的第三三元组参数。 执行第二转换的步骤的实施例包括基于表示投影设备和屏幕之间的可变距离的至少一个第一信息来计算第二转换矩阵的系数的步骤。