Invention Grant
US08456578B2 Image processing apparatus and control method thereof for correcting image signal gradation using a gradation correction curve
有权
用于使用灰度校正曲线校正图像信号灰度的图像处理装置及其控制方法
- Patent Title: Image processing apparatus and control method thereof for correcting image signal gradation using a gradation correction curve
- Patent Title (中): 用于使用灰度校正曲线校正图像信号灰度的图像处理装置及其控制方法
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Application No.: US13095040Application Date: 2011-04-27
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Publication No.: US08456578B2Publication Date: 2013-06-04
- Inventor: Masaru Tada
- Applicant: Masaru Tada
- Applicant Address: JP Tokyo
- Assignee: Canon Kabushiki Kaisha
- Current Assignee: Canon Kabushiki Kaisha
- Current Assignee Address: JP Tokyo
- Agency: Cowan, Liebowitz & Latman, P.C.
- Priority: JP2010-104895 20100430; JP2011-028816 20110214
- Main IPC: H04N5/14
- IPC: H04N5/14 ; H04N5/66
Abstract:
An image processing apparatus comprises: an acquisition unit that divides an inputted video image into a plurality of divisions, and acquires a histogram of each of the divisions; a generation unit that generates a gradation conversion curve for each of the divisions; a determination unit that determines whether or not the inputted video image is a multi-screen video image; and a gradation correction unit that performs a smoothing process in accordance with a pixel position, to correct the gradation of the video image in each of the divisions using the gradation conversion curve of each of the divisions, wherein when the inputted video image is the multi-screen video image, the determination unit detects a position of a boundary between the plurality of video image contents, and the gradation correction unit does not perform the smoothing process within a predefined area from the boundary.
Public/Granted literature
- US20110267542A1 IMAGE PROCESSING APPARATUS AND CONTROL METHOD THEREOF Public/Granted day:2011-11-03
Information query
