JP2007256781A - Video creating method, video distributing method, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To photograph a lecturer together with a material for lecture, and to let a learner easily concentrate on the lecture. <P>SOLUTION: Electronic data of an image of the material for lecture is transmitted to a front projector 2, from which the image of the material for lecture is projected on a whiteboard 3 serving as a projection screen. The lecturer 4 delivers a lecture based on the image of material for lecture while handwriting characters or graphics for explanation over the image of the material for lecture on the whiteboard 3. Animation video of lecture scenes is created by photographing, with a digital video camera 5, the lecturer 4 and the lecture scenes wherein whiteboard 3 is used, and is distributed to learners via communication lines such as the Internet. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a video generation method for generating a class video in a cram school. The present invention also relates to a video distribution method for generating a class video in a cram school and distributing it live through a communication line such as the Internet. Furthermore, this invention relates to the recording medium which recorded the lesson video produced | generated by the said video production | generation method.

  As a conventional video generation method for generating a class video, for example, there is a method described in Patent Document 1. In this video generation method, for example, as shown in FIG. 5, an image of a paper lecture material 101 placed on a shooting table (not shown) is placed above the shooting table (not shown). The video camera 102 takes a video. In addition, during moving image shooting, the voice of the lecturer 103 is picked up by a microphone (microphone), synthesized with the video of the lecture material 101, and recorded on a recording medium (not shown). The lecturer 103 gives a lecture based on the lecture material 101 while teaching a specific position of the lecture material 101, and the state is photographed by the digital video camera 102.

In addition, as shown in FIG. 6, characters or figures related to the lecture may be written by hand on the lecture material 101 during the lecture using the pen 104 as shown in FIG. In this way, characters or figures written by hand in the lecture material 101 are also photographed together with the lecture material 101 by the digital video camera 102.
JP 2002-139882 A

  However, in the conventional video generation method, the video of the lecturer during the lecture is not taken. Therefore, if the lesson video generated by the above-mentioned conventional method is played back on the TV screen in the cram school and viewed by the cram students, or if the class video is played back on the TV screen at home and viewed by the cram students, There is a problem that it is not easy to concentrate on the lecture content.

  In addition, the lecture material 101 is normally switched (rolled up) many times in one lecture, but the paper lecture material 101 is not easy to replace and the screen can be switched smoothly. There was no problem.

  In addition, since the lecture material 101 is made of paper, there is a problem that the degree of freedom in creating the lecture material 101 is low.

  Therefore, an object of the present invention is to provide a video generation method and a video distribution method that can photograph a lecturer together with lecture materials and can easily concentrate students on the lecture.

  Another object of the present invention is to provide a video generation method and a video distribution method capable of photographing characters or figures written on lecture materials together.

  Still another object of the present invention is to provide a video generation method and a video distribution method capable of smoothly switching the screen of lecture materials.

  Still another object of the present invention is to provide a video generation method and a video distribution method that can increase the degree of freedom in creating lecture materials.

  In order to solve the above problems, the video generation method of the present invention sends electronic data of lecture material images to the image information display means, displays the lecture material images on the display screen of the image information display means, and the lecturer The lecturer gives a lecture based on the lecture material image while handwriting characters or figures in the state of being overwritten on the lecture material image on the display screen of the image information display means, and uses the display screen of the image information display means The lecture scenery is photographed together with the lecturer to generate a moving image of the lecture scenery.

  According to this method, while the lecture material image is displayed on the display screen of the image information display means, the lecture scene is photographed using the display screen of the image information display means by the lecturer, so the lecturer is photographed together with the lecture material. can do. Therefore, it is possible to give the student a sense of realism similar to when the lecturer lectures in front of the eyes, and the student can be easily concentrated on the lecture. In addition, while displaying the lecture material image on the display screen of the image information display means, the instructor writes handwritten characters or figures on the lecture information image on the display screen of the image information display means. Since the state is photographed, characters or figures written on the lecture material can also be photographed. In addition, the electronic data of the lecture material image is sent to the image information display means, and the lecture material image is displayed on the display screen of the image information display means, so the screen of the lecture material screen is switched by switching the electronic data. Therefore, unlike the case of replacing the document paper, the screen of the lecture material can be switched smoothly. Also, since electronic data of lecture material images is sent to the image information projecting means, unlike the creation of lecture material images on paper, the degree of freedom in creating lecture materials can be increased.

  In the video generation method, the image information display means includes image information projection means to which electronic data of the lecture material image is supplied, and a projection screen that projects the lecture material image projected from the image information projection means. It is preferable. In this configuration, the electronic data of the lecture material image is sent to the image information projection means, the lecture material image is projected from the image information projection means onto the projection screen, and the lecturer superimposes the lecture material image on the projection screen. The lecturer gives a lecture based on the lecture material image while handwriting characters or figures in the writing state, and the lecture scene is shot by the lecturer using the projection screen to generate a video image of the lecture scenery. Become.

  According to this method, since the lecture scenery using the projection screen by the lecturer is photographed while projecting the lecture document image on the projection screen, the lecturer can be photographed together with the lecture material. Therefore, it is possible to give the student a sense of realism similar to when the lecturer lectures in front of the eyes, and the student can be easily concentrated on the lecture. In addition, while the lecture material image is projected onto the projection screen, the instructor writes the text or figure by hand while overwriting the lecture material image on the projection screen, and the state is photographed. You can also shoot characters and figures written in In addition, the electronic data of the lecture material image is sent to the image information projecting means, and the lecture material image is projected on the projection screen from the image information projecting means, so the screen of the lecture material is switched by switching the electronic data. Therefore, unlike the case of replacing the document paper, the screen of the lecture material can be switched smoothly. Also, since electronic data of lecture material images is sent to the image information projecting means, unlike the creation of lecture material images on paper, the degree of freedom in creating lecture materials can be increased.

  Also, the video distribution method of the present invention sends electronic data of lecture material images to the image information display means, displays the lecture material images on the display screen of the image information display means, and the instructor displays the image information display means. The lecturer gives a lecture based on the lecture material image while handwriting text or a figure in the state of being overwritten on the lecture material image on the screen, and the lecture scenery using the display screen of the image information display means is together with the lecturer. The video of the lecture scenery is generated by shooting, and the video of the lecture scenery is distributed to students through the communication line.

  In this video distribution method, the image information display means includes image information projection means to which electronic data of lecture material images is supplied, and a projection screen that projects the lecture material images projected from the image information projection means. It is preferable. In this configuration, the electronic data of the lecture material image is sent to the image information projection means, the lecture material image is projected from the image information projection means onto the projection screen, and the lecturer superimposes the lecture material image on the projection screen. The lecturer gives a lecture based on the lecture material image while handwriting characters or figures in the writing state, and the lecture scene is shot by using the projection screen by the lecturer to generate a video image of the lecture scenery. Scenery video will be distributed to students via a communication line.

  According to this method, the same operation and effect as the above-described image generation method can be obtained.

  In the above video generation method and video distribution method, the image information projection means is, for example, a front projector, and the projection screen is a white board. In particular, if a whiteboard is used as the projection screen, handwritten characters or figures can be easily erased by using a whiteboard writing instrument as the writing means.

  In the above video generation method and video distribution method, the image information projection means may be a rear projector, and the projection screen may be a translucent panel. In particular, when a rear projector is used, there is a projection screen between the rear projector and the instructor, and the projection light of the rear projector does not directly enter the instructor's eyes, so safety is high.

  When a rear projector is used as described above, the projection screen is often a projector-integrated type. In this case, if characters or figures are written directly on the projection screen, the written letters or figures are displayed. In many cases, it cannot be erased. In this case, when a writable / erasable transparent sheet is disposed on the front surface of the translucent panel and characters or figures are written by hand on the transparent sheet, the projection screen is not soiled by the addition of the letters or figures.

  In the video distribution method described above, it is preferable that the moving image video of the lecture scenery be streamed. In addition to the live distribution, the distribution of the moving image of the lecture scenery may be stored in a server and distributed on demand.

  The recording medium of the present invention records a moving image of a lecture scene generated by the video generation method of the present invention, and has the same effects as the video generation method of the present invention.

  According to the present invention, a lecturer (or a lecturer) can be photographed together with lecture materials, and a sense of reality close to that when the lecturer lectures in front of the eyes can be given to the student. Can be easily focused on. You can also photograph letters or figures written on lecture materials. Further, the screen of the lecture material can be switched by switching the electronic data, and therefore, the screen of the lecture material can be switched smoothly unlike the case of replacing the material sheet. Further, unlike creating lecture material images on paper, it is possible to increase the degree of freedom in creating lecture materials.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing the configuration of a video distribution system for implementing the video generation method and video distribution method of the present invention. In FIG. 1, reference numeral 1 denotes a material computer storing a lecture material image. Reference numeral 2 denotes a front projector that projects a lecture material image sent from the material computer 1. Reference numeral 3 denotes a whiteboard serving as a projection screen for projecting the lecture material image projected from the front projector 2. Reference numeral 4 denotes a lecturer (teacher) who uses a lecture material image on the whiteboard 3 and gives a lecture while overwriting characters or figures on the whiteboard 3 by hand for explanation. Reference numeral 5 denotes a digital video camera for photographing a lecture material image projected on the whiteboard 3 and a handwritten character or figure overlaid on the whiteboard 3 with respect to the lecture material image.

  Reference numeral 6 denotes a video recording device for recording a class video taken by the digital video camera 5 and transferring the recorded class video to a file, which is arranged near the teacher. The video recording device 6 includes a video encoding engine 7 that simultaneously encodes a class video taken by the digital video camera 5 and an RGB input lecture material image sent from the material computer 1 on two screens in real time, and a material computer. 1 includes a control module 8 for instructing switching of lecture material images sent from 1 and instructing start and stop of recording.

  Reference numeral 9 denotes an image storage means (hard disk device) for storing the video file (video content) transferred from the video recording device 6.

  Reference numeral 10 denotes an encoder control unit that performs encoder control of an image file based on an instruction from the control module 8. Reference numeral 11 denotes a WWW server that distributes image files stored in the image storage means (hard disk device) 9 through a communication line such as the Internet. The WWW server 11 distributes video in, for example, MPEG-4 format. As described above, when the video is distributed in the MPEG-4 format, the video can be easily displayed by the MPEG-4 plug-in player in the personal computer.

  Reference numeral 12 denotes a web. Reference numeral 13 denotes a personal computer in the classroom connected via the web 12 and the private school LAN 14. Reference numeral 15 denotes a home personal computer connected via the web 12, and the WWW server 11 can be accessed by inputting an ID and a password.

  Reference numeral 16 denotes a marker for writing a character or a figure on the whiteboard 3.

  Next, a video distribution method using the above video distribution system will be described. In this video distribution method, electronic data of a lecture material image is sent from the material computer 1 to a front projector 2 as image information projection means. Text images used as lecture material images sent from the material computer 1 to the front projector 2 can be created by various software such as presentation software, drawing software, and word processing software. Therefore, there is a high degree of freedom in creating lecture material images.

  The front projector 2 projects a lecture material image on a whiteboard 3 which is a projection screen. The lecturer 4 gives a lecture using the lecture material image projected on the whiteboard 3. The instructor 4 gives a lecture based on the lecture material image while handwriting characters or figures on the whiteboard 3 in a state of being overwritten with the marker 16 on the lecture material image.

  Then, a lecture scene using the whiteboard 3 by the lecturer 4 is photographed by the digital video camera 5 to generate a video image of the lecture scene, and the video image of the lecture scene is encoded into a specific video signal format. It will be distributed to students who are attending the school. The video of the lecture scene includes the voice of the lecturer.

  In the above description, the video generation method is shown until the motion video of the lecture scene is generated.

  The moving image (including audio) of the lecture scene shot by the digital video camera 5 is recorded by the video recording device 6, encoded into a predetermined video format, and transferred to the image storage means 9. The image storage means 9 stores a large number of video images of lecture scenery.

  The WWW server 11 distributes the moving image of the lecture scenery taken by the digital video camera 5 in real time via the image storage means 9, or distributes it on demand.

  In the classroom PC 13 installed in the classroom, the video images of the lecture scenery are distributed in real time or on demand via the web 12 and the LAN 14 in the school. By viewing the video, it is possible to take a lecture (class) by the instructor 4 even if there is no instructor in the classroom.

  In the home personal computer 15 installed in the home, the video image of the lecture scenery is distributed in real time or on demand via the web 12, and by inputting the ID and password, as in the classroom personal computer 13, A student who is a student can take a lecture (class) by the instructor 4 by viewing the video on the home PC 15 at home.

  An example of the screen of the classroom personal computer 13 and the home personal computer 15 is shown in FIG. In FIG. 2, reference numeral 21 indicates a monitor screen of the classroom personal computer 13 and the home personal computer 15. Reference numeral 22 denotes one display area of the monitor screen 21, and an image of the class scenery by the lecturer is displayed in the display area 22. In this lesson scene, a video of a white board on which a lecture material image is projected is displayed together with the lecturer 4, and handwritten characters or figures are also displayed. Reference numeral 23 denotes another display area on the monitor screen 21, and the lecture material image is displayed as it is in the display area 23. That is, the class scenery image and the lecture material image are displayed in a two-screen configuration.

  Here, the class scenery image is preferably a digital video, and the lecture material image is preferably an analog video. As described above, when the class scenery image is converted into a digital image, there are the following advantages. In other words, when creating video content that displays a class landscape image and a lecture material image in a two-screen configuration, the class landscape image is sent to the video recording device as an analog video (analog video signal), and the lecture material image is digital. When sent as a video (digital video signal) to a video recording device, a class scene image obtained by photographing handwritten characters and figures for explanation is subjected to analog processing, and a lecture material image is digitally processed. In this case, the resolution of the lesson scenery image may be low, and handwritten characters and figures may be difficult to read. However, in the case of the embodiment of the present invention, the class scenery image is sent to the video recording device as a digital video (digital video signal), and the lecture material image is sent to the video recording device as an analog video (analog video signal). If comprised in this way, the resolution of a class scenery image will become high and the interpretation of a handwritten character and a figure will become easy. Lecture material images are originally converted from digital image data, so the content of the lecture materials can be fully read even if analog processing is performed. Also, since the lecture material is displayed at a high resolution on the class scenery image, it can be seen, and there is no problem even if the resolution of the lecture material image is lowered.

  Note that both the class scenery image and the lecture material image may be sent as digital video signals to the video recording apparatus. However, in this case, the bit rate for distributing video content having a two-screen configuration is increased.

  As described above, when the class scenery image is processed as a digital video and the lecture material image is processed as an analog video, the bit rate for video distribution can be lowered, so that versatility is enhanced.

  In addition, even if the content of the lecture material on the whiteboard is hidden behind the instructor in the classroom scene, the content of the lecture material can be confirmed by looking at the display area 23. Therefore, there is no inconvenience even if the lecturer is reflected in the video of the lecture material. The display area 23 may display a reference material image or a commentary moving image different from the lecture material projected on the whiteboard.

  An example of a monitor screen of the video recording device 6 installed near the lecturer 4 is shown in FIG. In FIG. 3, reference numeral 31 indicates a monitor screen of the video recording apparatus 6, and reference numeral 32 indicates a child screen formed in the monitor screen 31. The monitor screen 31 displays images from the digital video camera 5, and the lecturer 4 can check the images (moving images) from the digital video camera 5 while giving a lecture. The sub-screen 32 displays a lecture material image (still image).

  An example of the monitor screen of the material computer 1 is shown in FIG. In FIG. 4, reference numeral 41 denotes a monitor screen of the material computer 1, and reference numeral 42 denotes a child screen formed in the monitor screen 41. Lecture material images (still images) are displayed on the monitor screen 41, and images from the digital video camera 5 are displayed on the sub-screen 42.

  The lesson scenes can be recorded live in front of a cram school student, such as an actual cram school, or in the studio.

  No personnel other than the instructor are required to shoot the class scenery. If the lecture material video (text, reference material) is imported into the material computer 1 in advance, “ Recording can be controlled simply by clicking on icons indicating “recording start”, “recording end”, “screen switching”, etc., and there is little increase in the labor of the lecturer during the lecture shooting.

  It should be noted that the video of the class scenery taken as described above can be recorded on a recording medium such as an optical disk and distributed to each student. In this case, the lecture can be viewed even if the student's personal computer is not connected to the Internet.

  As described above, according to this embodiment, since the lecture material image using the whiteboard 3 is photographed by the lecturer 4 while projecting the lecture material image onto the whiteboard 3 which is a projection screen, the lecturer 4 Can be taken together with lecture materials. Therefore, it is possible to give the students a sense of realism that is similar to when a lecturer gives a lecture in front of their eyes, allowing them to concentrate on the lecture (lecture) easily, and to conduct the lecture efficiently. . In addition, while projecting the lecture material image on the whiteboard 3, the instructor 4 writes handwritten text or figures for explanation while overwriting the lecture material image on the whiteboard 3, and shoots the state. Therefore, it is possible to take pictures of characters or figures written on lecture materials. In addition, since the electronic data of the lecture material image is sent to the front projector 2 and the lecture material image is projected on the whiteboard 3 from the front projector 2, the screen of the lecture material is switched by switching the electronic data. Therefore, unlike the case where the document paper is replaced, the screen of the lecture material can be switched smoothly. Also, since the electronic data of the lecture material image is sent to the front projector 2, it is possible to increase the degree of freedom in creating the lecture material, unlike creating the lecture material image on paper.

  Moreover, if the whiteboard 3 is used as a projection screen, a handwritten character or figure can be easily erased by using a whiteboard marker as writing means.

(Embodiment 2)
In the first embodiment, the front projector 2 is used as the image information projecting means, but a rear projector may be used. When a rear projector is used, a translucent panel is used as the projection screen. In this case, if you write characters or shapes directly on the translucent panel, you may not be able to erase the characters or shapes later. Place a transparent sheet in front of the translucent panel, and hand-write the characters or shapes on the transparent sheet. It is preferable to write in such that it can be erased.

  According to this embodiment, there is a translucent panel as a projection screen between the rear projector and the instructor, and the projection light of the rear projector does not directly enter the instructor's eyes, so safety is high. Other functions and effects are the same as those of the first embodiment.

  The image information display means for displaying the lecture material is not limited to the projector described in the above embodiment, and a liquid crystal display panel or a plasma display panel may be used. In this case, if characters, figures, etc. are directly written into the liquid crystal display panel or plasma display panel with a marker, the letters, figures, etc. may not be erased later. In that case, a transparent panel or the like may be disposed in front of the liquid crystal display panel or the plasma display panel, and explanatory characters, figures, or the like may be written on the transparent panel so as to be erasable using a writing tool such as a whiteboard marker.

  Further, the present invention can be used not only for classes in a cram school but also for various uses such as lectures and presentations such as product announcements.

  The video generation method and the video distribution method according to the present invention can photograph a lecturer together with lecture materials, can also photograph characters or figures written on the lecture materials, and switch electronic data. The screen of lecture materials can be switched, and therefore the screen of lecture materials can be switched smoothly unlike the case of replacing the material paper. Useful.

It is a block diagram which shows the video delivery system of Embodiment 1 of this invention. It is the schematic which shows the example of the monitor screen on a student's personal computer. It is the schematic which shows the example of the monitor screen of a video recording device. It is the schematic which shows the example of the monitor screen of the computer for data. It is the schematic which shows the conventional video production | generation method. It is a schematic diagram showing lecture materials.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Computer for documents 2 Front projector 3 White board 4 Lecturer 5 Digital video camera 6 Video recording device 7 Video encoding engine 8 Control module 9 Image storage means 10 Encoder control part 11 WWW server 12 Web 13 Classroom personal computer 14 School LAN
15 PC at home

Claims (15)

Send electronic data of lecture material images to image information display means, display the lecture material images on the display screen of the image information display means,
The lecturer gives a lecture based on the lecture material image while handwriting a character or a figure in a state of being overwritten on the lecture material image on the display screen of the image information display means,
A video generation method for generating a video image of a lecture scene by photographing a lecture scene using the display screen of the image information display means together with the lecturer.   2. The image information display means comprises image information projection means to which electronic data of the lecture material image is supplied, and a projection screen for projecting the lecture material image projected from the image information projection means. The video generation method described.   3. The image generation method according to claim 2, wherein the image information projection means is a front projector, and the projection screen is a white board.   3. The image generation method according to claim 2, wherein the image information projection means is a rear projector, and the projection screen is a translucent panel.   The video generation method according to claim 4, wherein a transparent sheet is disposed on the front surface of the translucent panel, and characters or figures are written by hand on the transparent sheet.   The video generation method according to claim 1, wherein a video in which the video image of the lecture landscape and the lecture material image are displayed on two screens is generated based on the video image of the lecture landscape and the lecture material image.   The video generation method according to claim 6, wherein the video of the lecture scene is a digital video and the lecture material video is an analog video. Sending electronic data of lecture material images to image information display means, displaying the lecture material images on the display screen of the image information display means,
The instructor gives a lecture based on the lecture material image while handwriting a character or a figure in a state of being overwritten on the lecture material image on the display screen of the image information display means,
A video distribution method for generating a video image of a lecture scene by photographing a lecture scene using the display screen of the image information display means together with the lecturer and distributing the video image of the lecture scene to students through a communication line.   9. The image information display means comprises image information projection means to which electronic data of the lecture material image is supplied, and a projection screen for projecting the lecture material image projected from the image information projection means. The video delivery method described.   The video distribution method according to claim 9, wherein the image information projection unit is a front projector, and the projection screen is a whiteboard.   The video distribution method according to claim 9, wherein the image information projection unit is a rear projector, and the projection screen is a translucent panel.   The video distribution method according to claim 11, wherein a transparent sheet is disposed on a front surface of the translucent panel, and characters or figures are handwritten on the transparent sheet.   9. The video according to claim 8, wherein the video content in which the video image of the lecture landscape and the lecture material image are displayed on two screens is generated by encoding the video of the lecture landscape and the material image for the lecture, respectively. Delivery method.   The video distribution method according to claim 13, wherein the video of the lecture scene is a digital video and the lecture material video is an analog video.   A recording medium on which a moving image of a lecture scene generated by the video generation method according to claim 1 is recorded.

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