公开(公告)号：US09258490B2

公开(公告)日：2016-02-09

申请号：US14194041

申请日：2014-02-28

Applicant: KONICA MINOLTA LABORATORY U.S.A., INC.

Inventor： Michel Julien Vidal-Naquet ,  Alexis Bienvenu

IPC: H04N5/235 ,  G06K9/40

CPC classification number: H04N5/2355 ,  G06K9/40 ,  H04N5/217 ,  H04N5/23277 ,  H04N5/235 ,  H04N5/2356

Abstract: An improved ghost-artifact detection and removal method for high-dynamic range (HDR) image creation and related apparatus are described. A binary ghost map is first generated for each image of the multiple input images by a ghost-artifact detection process, where one of the binary values indicate ghost pixels and the other indicates non-ghost pixels. Each binary ghost map is smoothed to generate a continuous-tone ghost map, by changing the pixel value of each non-ghost pixel of the binary map to a ghost value between the two binary values. The ghost value is calculated using a monotonous function of the distance between the non-ghost pixel of the binary map and the nearest ghost pixel. Ghost pixels in the binary ghost map are kept as fully ghost pixel in the continuous-tone ghost map. This method helps to reduce visibility of artifacts at ghost boundaries without losing small detected ghost regions.

Abstract translation: 描述了用于高动态范围（HDR）图像创建和相关装置的改进的鬼影伪像检测和去除方法。 首先通过鬼影伪影检测过程为多个输入图像的每个图像生成二进制幻像映射，其中二进制值中的一个指示幻像，另一个指示非重像素。 通过将二进制图的每个非重像素的像素值改变为两个二进制值之间的重影值，平滑每个二进制幻影映射以生成连续色调重影映射。 使用二值图的非重像素与最近的重像素之间的距离的单调函数来计算鬼值。 二进制幽灵地图中的鬼像素保持为连续色调幽灵地图中的完全幻像。 这种方法有助于减少鬼边界的伪像的可视性，而不会损失小的检测到的鬼区。

公开(公告)号：US20150249779A1

公开(公告)日：2015-09-03

申请号：US14194041

申请日：2014-02-28

Applicant: KONICA MINOLTA LABORATORY U.S.A, INC.

Inventor： Michel Julien Vidal-Naquet ,  Alexis Bienvenu

IPC: H04N5/235 ,  G06K9/40

CPC classification number: H04N5/2355 ,  G06K9/40 ,  H04N5/217 ,  H04N5/23277 ,  H04N5/235 ,  H04N5/2356

Abstract: An improved ghost-artifact detection and removal method for high-dynamic range (HDR) image creation and related apparatus are described. A binary ghost map is first generated for each image of the multiple input images by a ghost-artifact detection process, where one of the binary values indicate ghost pixels and the other indicates non-ghost pixels. Each binary ghost map is smoothed to generate a continuous-tone ghost map, by changing the pixel value of each non-ghost pixel of the binary map to a ghost value between the two binary values. The ghost value is calculated using a monotonous function of the distance between the non-ghost pixel of the binary map and the nearest ghost pixel. Ghost pixels in the binary ghost map are kept as fully ghost pixel in the continuous-tone ghost map. This method helps to reduce visibility of artifacts at ghost boundaries without losing small detected ghost regions.

Abstract translation: 描述了用于高动态范围（HDR）图像创建和相关设备的改进的鬼影伪像检测和去除方法。 首先通过鬼影伪影检测过程为多个输入图像的每个图像生成二进制幻像映射，其中二进制值中的一个指示幻像，另一个指示非重像素。 通过将二进制图的每个非重像素的像素值改变为两个二进制值之间的重影值，平滑每个二进制幻影映射以生成连续色调重影映射。 使用二值图的非重像素与最近的重像素之间的距离的单调函数来计算鬼值。 二进制幽灵地图中的鬼像素保持为连续色调幽灵地图中的完全幻像。 这种方法有助于减少鬼边界的伪像的可视性，而不会损失小的检测到的鬼区。

公开(公告)号：US20150249774A1

公开(公告)日：2015-09-03

申请号：US14194168

申请日：2014-02-28

Applicant: KONICA MINOLTA LABORATORY U.S.A., INC.

Inventor： Alexis Bienvenu ,  Michel Julien Vidal-Naquet

IPC: H04N5/21

CPC classification number: H04N5/211 ,  G06T5/008 ,  G06T5/50 ,  G06T2207/20021 ,  G06T2207/20072 ,  G06T2207/20076 ,  G06T2207/20208 ,  H04N5/2355

Abstract: In high dynamic range (HDR) image creation, a ghost artifact detection method divides the images (brackets) into multiple tiles, and selects one bracket for each tile as the local reference bracket. The local reference brackets are selected via optimization of an objective function which includes both a component that measures exposure quality of individual tiles and a component that measures correlation between neighboring tiles. The minimization can be realized by constructing a graph for the objective function and calculating a minimum cut of the graph using a graph cut algorithm. Graph examples for three and four image sets are given. Ghost artifact detection is then performed on a tile-by-tile basis by using the local reference bracket for each tile. Ghost maps are generated this way and used for HDR image creation. This method minimizes artifacts due to inconsistencies in local reference bracket selection in areas involved in ghost-inducing objects.

Abstract translation: 在高动态范围（HDR）图像创建中，鬼影检测方法将图像（括号）分为多个图块，并为每个图块选择一个括号作为本地参考括号。 通过优化目标函数来选择局部参考括号，目标函数包括测量各个瓦片的曝光质量的组件和测量相邻瓦片之间的相关性的组件。 可以通过构建目标函数的图形并使用图形切割算法计算图形的最小值来实现最小化。 给出了三个和四个图像集的图示例。 然后通过使用每个瓦片的本地参考括号，逐个瓦片地执行Ghost伪影检测。 Ghost地图以这种方式生成，并用于HDR图像创建。 这种方法可以最大限度地减少由于引起鬼影的对象所涉及的区域中本地参考括号选择不一致所造成的伪影。

公开(公告)号：US09210335B2

公开(公告)日：2015-12-08

申请号：US14219013

申请日：2014-03-19

Applicant: KONICA MINOLTA LABORATORY U.S.A., INC.

Inventor： Alexis Bienvenu

IPC: G06K9/00 ,  H04N5/235 ,  G06T5/00 ,  G06T5/50 ,  H04N5/265

CPC classification number: H04N5/2355 ,  G06T5/002 ,  G06T5/006 ,  G06T5/007 ,  G06T5/009 ,  G06T5/50 ,  G06T2207/10144 ,  G06T2207/20008 ,  G06T2207/20208 ,  H04N5/2353 ,  H04N5/2356 ,  H04N5/265

Abstract: An improved method for generating high dynamic range images by modifying the weight function used in conventional methods to weigh pixel values when combining multiple images in an input image set. Different weight functions, as functions of intensity, are used for different images (brackets). For darker brackets, a region near the high end of the intensity range is given higher weight values than a symmetrical region near the lower end of the intensity range; for brighter brackets, a region near the lower end of the intensity range is given higher weight values than a symmetrical region near the higher end of the intensity range. The weight function for the middle brackets are kept symmetrical but its function is non-zero at the two end points of the intensity range. This is effective for reducing chromatic artifacts for under- or over-exposed areas, in particular when ghost artifact removal is incorporated.

Abstract translation: 一种用于通过修改传统方法中使用的权重函数来生成高动态范围图像的改进方法，以便在输入图像集中组合多个图像时对像素值进行加权。 作为强度函数的不同的权重函数用于不同的图像（括号）。 对于较暗的支架，强度范围的高端附近的区域具有比强度范围的下端附近的对称区域更高的重量值; 对于较亮的支架，在强度范围的下端附近的区域被给予比在强度范围的较高端附近的对称区域更高的重量值。 中间支架的重量功能保持对称，但其功能在强度范围的两个端点处不为零。 这对于减少曝光不足或曝光过度过度的区域的彩色伪像是有效的，特别是当引入鬼影去除时。

公开(公告)号：US09185270B2

公开(公告)日：2015-11-10

申请号：US14194168

申请日：2014-02-28

Applicant: KONICA MINOLTA LABORATORY U.S.A., INC.

Inventor： Alexis Bienvenu ,  Michel Julien Vidal-Naquet

IPC: G06K9/40 ,  H04N5/21

CPC classification number: H04N5/211 ,  G06T5/008 ,  G06T5/50 ,  G06T2207/20021 ,  G06T2207/20072 ,  G06T2207/20076 ,  G06T2207/20208 ,  H04N5/2355

Abstract: In high dynamic range (HDR) image creation, a ghost artifact detection method divides the images (brackets) into multiple tiles, and selects one bracket for each tile as the local reference bracket. The local reference brackets are selected via optimization of an objective function which includes both a component that measures exposure quality of individual tiles and a component that measures correlation between neighboring tiles. The minimization can be realized by constructing a graph for the objective function and calculating a minimum cut of the graph using a graph cut algorithm. Graph examples for three and four image sets are given. Ghost artifact detection is then performed on a tile-by-tile basis by using the local reference bracket for each tile. Ghost maps are generated this way and used for HDR image creation. This method minimizes artifacts due to inconsistencies in local reference bracket selection in areas involved in ghost-inducing objects.

Abstract translation: 在高动态范围（HDR）图像创建中，鬼影检测方法将图像（括号）分为多个图块，并为每个图块选择一个括号作为本地参考括号。 通过优化目标函数来选择局部参考括号，目标函数包括测量各个瓦片的曝光质量的组件和测量相邻瓦片之间的相关性的组件。 可以通过构建目标函数的图形并使用图形切割算法计算图形的最小值来实现最小化。 给出了三个和四个图像集的图示例。 然后通过使用每个瓦片的本地参考括号，逐个瓦片地执行Ghost伪影检测。 Ghost地图以这种方式生成，并用于HDR图像创建。 这种方法可以最大限度地减少由于引起鬼影的对象所涉及的区域中本地参考括号选择不一致所造成的伪影。

公开(公告)号：US20150271383A1

公开(公告)日：2015-09-24

申请号：US14219013

申请日：2014-03-19

Applicant: KONICA MINOLTA LABORATORY U.S.A., INC.

Inventor： Alexis Bienvenu

IPC: H04N5/235 ,  G06T5/50 ,  H04N5/265 ,  G06T5/00

CPC classification number: H04N5/2355 ,  G06T5/002 ,  G06T5/006 ,  G06T5/007 ,  G06T5/009 ,  G06T5/50 ,  G06T2207/10144 ,  G06T2207/20008 ,  G06T2207/20208 ,  H04N5/2353 ,  H04N5/2356 ,  H04N5/265

Abstract: An improved method for generating high dynamic range images by modifying the weight function used in conventional methods to weigh pixel values when combining multiple images in an input image set. Different weight functions, as functions of intensity, are used for different images (brackets). For darker brackets, a region near the high end of the intensity range is given higher weight values than a symmetrical region near the lower end of the intensity range; for brighter brackets, a region near the lower end of the intensity range is given higher weight values than a symmetrical region near the higher end of the intensity range. The weight function for the middle brackets are kept symmetrical but its function is non-zero at the two end points of the intensity range. This is effective for reducing chromatic artifacts for under- or over-exposed areas, in particular when ghost artifact removal is incorporated.

Abstract translation: 一种用于通过修改传统方法中使用的权重函数来生成高动态范围图像的改进方法，以便在输入图像集中组合多个图像时对像素值进行加权。 作为强度函数的不同的权重函数用于不同的图像（括号）。 对于较暗的支架，强度范围的高端附近的区域具有比强度范围的下端附近的对称区域更高的重量值; 对于较亮的支架，在强度范围的下端附近的区域被给予比在强度范围的较高端附近的对称区域更高的重量值。 中间支架的重量功能保持对称，但其功能在强度范围的两个端点处不为零。 这对于减少曝光不足或曝光过度过度的区域的彩色伪像是有效的，特别是当引入鬼影去除时。