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Image processing apparatus and control method thereof

一种图像处理装置、图像的技术，应用在图像数据处理、图像增强、图像分析等方向，能够解决电路规模增加、处理时间增加等问题

Inactive Publication Date: 2012-10-17
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since this method requires hardware or processing for detecting motion vectors, other problems arise regarding an increase in circuit scale and an increase in processing time related to calculation, etc.

Method used

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  • Image processing apparatus and control method thereof
  • Image processing apparatus and control method thereof
  • Image processing apparatus and control method thereof

Examples

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no. 1 example

[0037] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below will exemplify the case where the present invention is applied to a digital camera as an example of an image processing device capable of outputting images obtained by synthesizing a plurality of images (by taking images of subjects with different exposure times) obtain these images) with an extended dynamic range (HDR image). However, the present invention is applicable to any device capable of outputting an image whose dynamic range has been expanded by compositing a plurality of images obtained by taking images of subjects with different exposure times. In this specification, "image discontinuity" generally means the above-mentioned problems regarding transparency, texture discontinuity, afterimage, multiple edges, and pattern blending in HDR images.

[0038] (Functional structure of a digital camera)

[0039]...

no. 2 example

[0100] The aforementioned first embodiment explained the case of using the image elements of one image in which the number of overexposed highlight image elements and shadow detail loss image elements is relatively small among a plurality of images with different exposures, as the image element corresponding to the motion in the HDR image. The image element to which the image element corresponds. Therefore, in the first embodiment, an image element serving as an image element corresponding to a moving image element of an HDR image is extracted from a common image throughout the HDR image. On the other hand, in the image processing apparatus of the present embodiment, image elements corresponding to changes in the subject are grouped, and an optimally exposed image is selected for each group to use the selected image when generating the HDR image. The image element value serves as the image element for this group. A method of generating an image whose dynamic range is further ...

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Abstract

The invention provides an image processing apparatus and a control method thereof. After a plurality of differently exposed images are obtained, and tone levels of the plurality of images are adjusted, image elements corresponding to changes of objects are detected based on pixel value differences between the plurality of images. Then, the numbers of blown-out highlight and shadow-detail loss image elements in the image elements corresponding to the changes of the objects are counted for the plurality of images. Then, an image in which the total of the numbers of image elements is smallest is selected. Furthermore, image elements corresponding to the changes of the objects in the selected image are used as those corresponding to image elements corresponding to the changes of the objects in an HDR image to be generated.

Description

technical field [0001] The present invention relates to an image processing device and a control method, in particular to a dynamic range extension technology for extending the tone range by synthesizing multiple images with different exposures. Background technique [0002] In recent years, some imaging apparatuses such as digital still cameras and digital video cameras have a dynamic range expansion function obtained by synthesizing a plurality of differently exposed images obtained by capturing images of subjects with different exposure times. An image with an extended tonal range. [0003] The basic concept of the dynamic range extension technology (that is, the so-called HDR (High Dynamic Range, high dynamic range) image generation technology) used in the dynamic range extension function is as follows. [0004] • Compensate the image elements of the blown-out highlight area in the overexposed image from the image elements of the captured image whose exposure time is sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/04H04N5/232
CPCG06T2207/20208G06T5/007H04N5/2356G06T5/008H04N9/04H04N5/35572H04N5/2353H04N5/2355G06T5/50G06T2207/10144H04N5/232H04N23/743H04N23/73H04N23/741H04N25/587G06T5/94
Inventor 椿秀敏
Owner CANON KK
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