JP-7854852-B2 - Image capture control device, image capture control method

JP7854852B2JP 7854852 B2JP7854852 B2JP 7854852B2JP-7854852-B2

Inventors

小林秀典

Assignees

キヤノン株式会社

Dates

Publication Date: 20260507
Application Date: 20220516

Claims (15)

A grouping means that determines the continuity between a first description added to the target and a second description that was added to the target before the first description, based on the result of the determination, and groups the descriptions in the target. The system includes a control means for controlling the field of view of the imaging device to capture a description of the imaging target of the group to be distributed in the frame, based on the time for each group obtained by the grouping means , The imaging control device is characterized in that the grouping means determines whether there is any overlap between the projected area of the page projected onto the imaging target and the area of an existing group, based on the result of the determination, and groups the projected area of the imaging target .
The imaging control device according to claim 1, characterized in that the grouping means determines the spatial and/or temporal continuity between a first description added to the imaging target and a second description added to the imaging target prior to the first description.
The imaging control device according to claim 1, characterized in that, if the grouping means determines that there is continuity between the first description added to the imaging target and the second description added to the imaging target prior to the first description, it includes the first description added to the imaging target in the group of the second description added to the imaging target prior to the first description.
The imaging control device according to claim 1, characterized in that, if the grouping means determines that there is no continuity between the first description added to the imaging target and the second description that was added to the imaging target prior to the first description, it generates a group of the first descriptions added to the imaging target.
The imaging control device according to claim 1, characterized in that, if the grouping means determines that there is an overlap between the projected area of the page projected onto the imaging target and the area of the existing group, the projected area of the page projected onto the imaging target is included in the existing group.
The imaging control device according to claim 1, characterized in that the grouping means generates a group of projected areas of the page projected onto the imaging target when it determines that there is no overlap between the projected area of the page projected onto the imaging target and the area of the existing group.
moreover, The imaging control device according to claim 1, further comprising means for detecting the movement of the object to be imaged and obtaining the position of the object to be imaged.
A grouping means that determines the continuity between a first description added to the target and a second description that was added to the target before the first description, based on the result of the determination, and groups the descriptions in the target. Based on the time for each group obtained by the grouping means, a control means controls the field of view of the imaging device to capture the description of the imaging target of the group to be distributed in the frame. Equipped with, The image capture control device is characterized in that the control means updates the set field of view to include the groups in order from the most recent group, and updates the set field of view until the zoom rate corresponding to the set field of view is no longer included in the allowable zoom range of each group included in the set field of view, and the updated set field of view is set as the field of view.
A grouping means that determines the continuity between a first description added to the target and a second description that was added to the target before the first description, based on the result of the determination, and groups the descriptions in the target. Based on the time for each group obtained by the grouping means, a control means controls the field of view of the imaging device to capture the description of the imaging target of the group to be distributed in the frame. Equipped with, The control means is characterized by determining the permissible zoom range of a group including characters according to the size of the characters.
A grouping means that determines the continuity between a first description added to the target and a second description that was added to the target before the first description, based on the result of the determination, and groups the descriptions in the target. A control means for controlling the field of view of the imaging device to capture the description of the imaging target of the group to be distributed in the frame, based on the time for each group obtained by the grouping means, Means for generating a frame for distribution, in which partial images within each of the fields of view included in the aforementioned field of view are arranged such that the positional relationship of the partial images within each field of view is maintained in at least one of the horizontal and vertical directions. An imaging control device characterized by comprising:
moreover, The imaging control device according to claim 1, characterized in that it includes means for outputting the determined angle of view to an imaging device having a camera capable of pan, tilt, and zoom control.
The imaging control device according to claim 1, characterized in that the time relating to the group includes the time of creation of the group, the update time for the group, and the instruction time for the group.
The imaging control device according to claim 1, characterized in that the imaging target includes a blackboard and a screen.
An imaging control method performed by an imaging control device, The grouping means of the imaging control device determines the continuity between a first description added to the imaging target and a second description that was added to the imaging target prior to the first description, and groups the descriptions in the imaging target based on the result of this determination. The control means for the imaging control device includes a control step of controlling the field of view of the imaging device so as to capture a description of the imaging target of the group to be distributed in the frame, based on the time for each group obtained in the grouping step . The imaging control method is characterized in that, in the grouping step, it is determined whether there is any overlap between the projected area of the page projected onto the imaging target and the area of an existing group, and based on the result of the determination, the projected area of the imaging target is grouped .
A computer program for causing a computer to function as one of the means of an imaging control device according to any one of claims 1 to 13 .

Description

This disclosure relates to imaging control technology. In lectures and other information-sharing settings, blackboards, whiteboards, screens, and other information-sharing materials are commonly used to aid student comprehension. Therefore, when distributing lecture videos to students outside the lecture hall, it is desirable to include the information displayed on the information-sharing materials in the video. However, if the field of view is too wide, the text in the video will be too small and difficult to read. Conversely, if the field of view is too narrow, essential information may not be included, making it difficult to understand the lecture. Therefore, it is important to capture the information-sharing materials with an appropriate field of view. On the other hand, several technologies have been proposed to determine the appropriate field of view for streamed video without requiring operation by a cameraman, with the aim of reducing manpower. Patent Document 1 detects changes in the feature quantities of a pre-set imaging area and selectively determines the cropping range. Patent Document 2, on the other hand, determines the field of view for panning while maintaining a zoom magnification that allows text to be read, according to the description. International Publication No. 2019/087577Patent No. 5398359 A block diagram showing an example of the system configuration.A block diagram showing an example of the functional configuration of the imaging control device 101.A flowchart for grouping information on a shared information board.A schematic diagram illustrating how font size is detected.A flowchart for the grouping process related to projection to the information sharing board.Flowchart for the time update process.Flowchart for recording target location.Flowchart for updating the target location.A diagram showing an example of the structure of descriptive information.A diagram illustrating the content represented by the descriptive information in Figure 9.Flowchart for determining the field of view.Flowchart for angle-of-view compositing.A diagram illustrating the field-of-view compositing process. The embodiments will be described in detail below with reference to the attached drawings. Note that the following embodiments do not limit the scope of this disclosure as defined in the claims. While several features are described in the embodiments, not all of these features are essential to this disclosure, and the features may be combined in any way. Furthermore, in the attached drawings, identical or similar configurations are given the same reference numerals, and redundant descriptions are omitted. [First Embodiment] First, an example of the system configuration according to this embodiment will be explained using the block diagram in Figure 1. The system according to this embodiment is a system that captures video images of a lecture being conducted using a flat surface member such as a blackboard, whiteboard, or screen (hereinafter referred to as an information sharing board), and distributes the captured video images. As shown in Figure 1, the system according to this embodiment has an imaging device 102, an imaging control device 101, and a viewing terminal 104. The imaging control device 101 and the viewing terminal 104 are configured to communicate data with each other via a wired and/or wireless network 103. Note that the network configuration between the imaging control device 101 and the viewing terminal 104 is not limited to a specific network configuration. First, let's describe the imaging device 102. The imaging device 102 is installed and configured in a lecture room where information sharing boards are installed, so as to be able to image all the information sharing boards in that lecture room. The imaging device 102 has one high-resolution camera, which captures video footage of "a lecture being conducted using the information sharing boards," and sequentially outputs each frame of the captured video footage to the imaging control device 101. The imaging device 102 and the imaging control device 101 may be connected by a wired connection or wirelessly. Next, the image capture control device 101 will be described. The image capture control device 101 determines the range (angle of view) of the area (low-resolution area) to be extracted from the frame (high-resolution frame) received from the image capture device 102, extracts the area within the determined angle of view, and generates a distribution frame containing the extracted area. In the following description, the zoom ratio of the angle of view refers to the magnification used when enlarging or reducing the extracted area to match the distribution frame. The image capture control device 101 then distributes the generated distribution frame to the viewing terminal 104 via the network 103. Although audio will not be discussed below, it will be assumed that the frame distributed by the image capture control device 101 to the