# US 8,542,948 B2 · Image processing apparatus and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,542,948 B2 - Document ID: US8542948B2 - Status: Granted - Kind: B2 - Application number: 12/574,010 - Filed: 2009-10-06 - Published: 2010-04-08 - Granted: 2013-09-24 - Earliest claimed: 2009-10-06 - Assignees: Canon Kabushiki Kaisha - Applicants: Yasuhiro Kato; Shinji Shiraga; Kotaro Yano - Inventors: Yasuhiro Kato; Shinji Shiraga; Kotaro Yano - Web page: https://patentgrep.com/patent/US8542948B2 ## CPC - H04N 7/15: Conference systems - G06V 10/28: Quantising the image, e.g. histogram thresholding for discrimination between background and foreground patterns - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING ## Abstract An image processing apparatus obtains a difference between a partial region of an input image and a partial region of a background image, stored in a storage device, corresponding to the partial region of the input image, determines whether each partial region of the input image is a moving body region or a background region based on the difference, and combines the partial region of the input image determined as the background region and the partial region of the background image corresponding to the partial region of the input image to update the background image. ## Claims ### Claim 1 An image processing apparatus comprising: an image input unit configured to input an image; a region determination unit configured to obtain a difference between a partial region of an input image input by the image input unit and a partial region of a background image, stored in a storage device, corresponding to the partial region of the input image and to determine whether each partial region of the input image is a moving body region or a background region based on the difference; and a synthesizing unit configured to synthesize the partial region of the input image determined as the background region by the region determination unit and the partial region of the background image corresponding to the background region of the input image by calculating respective pixel values of corresponding regions; and an updating unit configured to update a partial region the background image corresponding to the background region of the input image by the synthesized image for the background region. ### Claim 2 (depends on 1) The image processing apparatus according to claim 1, further comprising an image combining unit configured to combine the input image and the background image updated by the updating unit. ### Claim 3 (depends on 2) The image processing apparatus according to claim 2, further comprising a transmission unit configured to transmit a combined image generated by the image combining unit. ### Claim 4 (depends on 1) The image processing apparatus according to claim 1, wherein the region determination unit transforms the respective partial regions of the input image and the background image into spatial-frequency components, obtains a difference between the spatial-frequency component of the partial region of the input image and the spatial-frequency component of the partial region of the background image corresponding to the partial region of the input image, and determines whether each partial region of the input image is the moving body region or the background region based on the difference. ### Claim 5 (depends on 1) The image processing apparatus according to claim 1, further comprising: a luminance change determination unit configured to compare the partial region of the input image determined as the background region by the region determination unit with the partial region of the background image corresponding to the partial region of the input image to determine a luminance change; and a setting unit configured to set a combining ratio used for combining by the updating unit based on the luminance change determined by the luminance change determination unit. ### Claim 6 (depends on 1) The image processing apparatus according to claim 1, wherein the image input unit receives and inputs an image captured by an imaging unit from the imaging unit. ### Claim 7 (depends on 1) The image processing apparatus according to claim 1, further comprising a background image setting unit configured to receive an image composed only of a whiteboard captured by the imaging unit from the imaging unit and to store the received image as an initial background image in the storage device. ### Claim 8 (depends on 1) The image processing apparatus according to claim 1, wherein the synthesizing unit synthesizes the partial region of the input image determined as the background region by the region determination unit and the partial region of the background image corresponding to the partial region of the input image at a set synthesizing ratio to update the background image. ### Claim 9 An image processing method performed by using a processor, the method comprising: inputting an image; obtaining a difference between a partial region of an input image and a partial region of a background image, stored in a storage device, corresponding to the partial region of the input image and determining whether each partial region of the input image is a moving body region or a background region based on the difference; and synthesizing the partial region of the input image determined as the background region and the partial region of the background image corresponding to the background region of the input image by calculating respective pixel values of corresponding regions; and updating a partial region of the background image corresponding to the background region of the input image by the synthesized image for the background region. ### Claim 10 (depends on 9) A computer-readable storage medium storing a program for instructing a computer to implement the image processing method according to claim 9.