CN105245784A - Shooting processing method and shooting processing device for projection region in multimedia classroom - Google Patents
Shooting processing method and shooting processing device for projection region in multimedia classroom Download PDFInfo
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- CN105245784A CN105245784A CN201410295200.4A CN201410295200A CN105245784A CN 105245784 A CN105245784 A CN 105245784A CN 201410295200 A CN201410295200 A CN 201410295200A CN 105245784 A CN105245784 A CN 105245784A
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- 238000003672 processing method Methods 0.000 title abstract 3
- 238000000034 method Methods 0.000 claims description 36
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008921 facial expression Effects 0.000 description 1
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Abstract
The invention is applicable to the technical field of video processing, and provides a shooting processing method and a shooting processing device for a projection region in a multimedia classroom. The shooting processing method comprises the steps of positioning a shooting region in the multimedia classroom, wherein the shooting region comprises a lecturer region and the projection region; exposing the shooting region according to exposure requirements of the lecturer region, and shooting to acquire first video; acquiring projection source video, acquiring image parameters of the projection region in the first video, controlling deformation of each frame image of the projection source video according to the image parameters so as to acquire deformation video data; and replacing the projection region in the first video with the deformation video data so as to acquire second video. According to the invention, the projection region in the first video is replaced with the deformation video data, so that the second video in which both the lecturer region and the projection region are appropriate in brightness is acquired, thereby solving a problem of obscure projection content caused by excessive exposure of the projection region in shooting of the multimedia classroom.
Description
Technical field
The invention belongs to technical field of video processing, particularly relate to photographing process method and the device of view field in a kind of multi-media classroom.
Background technology
In multi-media classroom, in order to capture video course etc., need lecturer and project content to be all filmed.Fig. 1 shows the schematic diagram of the shooting area of multi-media classroom, and as shown in Figure 1, the shooting area of multi-media classroom comprises lecturer and view field.In multi-media classroom, in order to make projection screen have good drop shadow effect, usually window being hidden tight with curtain, and the light before projection screen being turned off, only with the lighting away from projection screen.Like this, the light in whole classroom is darker.Existing video classes is main mainly with lecturer's camera lens greatly, namely requires to expose for benchmark with the exposure of lecturer's face, causes view field over-exposed, and view field crosses and brightly even cannot see project content clearly.
Summary of the invention
The object of the embodiment of the present invention is the photographing process method providing view field in a kind of multi-media classroom, and to solve in the shooting of multi-media classroom, view field is over-exposed causes the unsharp problem of project content.
The embodiment of the present invention is achieved in that the photographing process method of view field in a kind of multi-media classroom, comprising:
In described multi-media classroom, location shooting area, described shooting area comprises lecturer region and view field;
According to the exposure demand in described lecturer region, described shooting area is exposed, and shooting obtains the first video;
Acquired projections source video, obtains the frame parameter of the view field in described first video, controls the deformation of every two field picture of described projection source video, obtain deformation video data according to described frame parameter;
Replace the described view field in described first video with described deformation video data, obtain the second video.
Another object of the embodiment of the present invention is the photographing process device providing view field in a kind of multi-media classroom, comprising:
Shooting area locating module, in described multi-media classroom, location shooting area, described shooting area comprises lecturer region and view field;
First video capture module, for the exposure demand according to described lecturer region, exposes described shooting area, and shooting obtains the first video;
Deformation video data acquisition module, for acquired projections source video, obtains the frame parameter of the view field in described first video, controls the deformation of every two field picture of described projection source video, obtain deformation video data according to described frame parameter;
Replacement module, for replacing the described view field in described first video with described deformation video data, obtains the second video.
The beneficial effect that the embodiment of the present invention compared with prior art exists is: the embodiment of the present invention is by multi-media classroom, with the exposure demand in lecturer region for benchmark exposes shooting area, take the first video, again according to the frame parameter of view field in the first video, the deformation controlling every two field picture of projection source video obtains deformation video data, and replace the view field in the first video with deformation video data, obtain the second video that the equal brightness in lecturer region and view field is suitable thus, thus solve the unsharp problem of the project content caused because view field is over-exposed in the shooting of multi-media classroom.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of the shooting area of multi-media classroom;
Fig. 2 is the realization flow figure of the photographing process method of view field in the multi-media classroom that provides of the embodiment of the present invention;
Fig. 3 is the specific implementation flow chart replacing the described view field in described first video in the photographing process method step S204 of view field in the multi-media classroom that provides of the embodiment of the present invention with described deformation video data;
Fig. 4 be view field in the multi-media classroom that provides of the embodiment of the present invention photographing process method step S203 described in control the specific implementation flow chart of the deformation of every two field picture of described projection source video according to described frame parameter;
Fig. 5 be view field in the multi-media classroom that provides of the embodiment of the present invention photographing process method step S202 described according to the exposure demand in described lecturer region, to the specific implementation flow chart that described shooting area exposes;
Fig. 6 is the structured flowchart of the photographing process device of view field in the multi-media classroom that provides of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The embodiment of the present invention is by multi-media classroom, with the exposure demand in lecturer region for benchmark exposes shooting area, take the first video, again according to the frame parameter of view field in the first video, the deformation controlling every two field picture of projection source video obtains deformation video data, and replace the view field in the first video with deformation video data, obtain the second video that the equal brightness in lecturer region and view field is suitable thus, thus solve the unsharp problem of the project content caused because view field is over-exposed in the shooting of multi-media classroom.
Fig. 2 shows the realization flow figure of the photographing process method of view field in the multi-media classroom that the embodiment of the present invention provides, and details are as follows:
In step s 201, in described multi-media classroom, location shooting area, described shooting area comprises lecturer region and view field.
In embodiments of the present invention, multi-media classroom is made up of plurality of devices such as multimedia computer, liquid crystal projector, digital video frequency display table, central control system, projection screen and sound equipments.Project content exports liquid crystal projector to by multimedia computer, then is projected on the projection screen by liquid crystal projector.
In order to capture video course, need to control video camera and take the video comprising lecturer and projection screen.The region at lecturer place is called lecturer region, and the region at projection screen place is called view field.The scope that video camera can be taken is called shooting area.
In step S202, according to the exposure demand in described lecturer region, described shooting area is exposed, and shooting obtains the first video.
In order to make lecturer in video exposure be suitable for, the benchmark adjusted using the brightness in lecturer region as camera exposure, exposes whole shooting area, and shooting obtain the first video.It should be noted that, in multi-media classroom, in order to make projection screen have good drop shadow effect, usually window being hidden tight with curtain, and the light before projection screen being turned off, only with the lighting away from projection screen.Like this, the light in whole classroom is darker.In the present embodiment, require as while benchmark carries out exposing with the exposure in lecturer region, view field, by over-exposed, make view field cross and brightly even cannot see project content clearly.
In step S203, acquired projections source video, obtains the frame parameter of the view field in described first video, controls the deformation of every two field picture of described projection source video, obtain deformation video data according to described frame parameter.
Preferably, described projection source video is identical with the frame per second of described first video.
In embodiments of the present invention, project content, while project content is transferred to liquid crystal projector, is transferred to VGA (VideoGraphicsArray, Video Graphics Array) encoder by multimedia computer.The frame per second that VGA encoder is taken according to video camera, produces and generates projection source video by project content, and therefore, the projection source video produced and generated is identical with the frame per second of the first video.
In order to the image making the image of projection source video accurately cover the view field in the first video, need the deformation of the every two field picture controlling projection source video according to the frame parameter of the view field in the first video, obtain deformation video data.Here, deformation video data refers to the deformation of the every two field picture by controlling projection source video, obtains one group of strain image, by the frame per second of strain image according to projection source video, generates deformation video data.
In step S204, replace the described view field in described first video with described deformation video data, obtain the second video.
Here, refer to the view field that deformation video data is replaced in the first video, every two field picture of the view field in the first video is covered with every two field picture of deformation video data, make in the second video obtained, view field's exposure is suitable, thus solves the unsharp problem of project content caused because view field is over-exposed in multi-media classroom.
Fig. 3 shows the specific implementation flow chart replacing the described view field in described first video in the photographing process method step S204 of view field in the multi-media classroom that the embodiment of the present invention provides with described deformation video data, with reference to Fig. 3:
Further, comprise with the described view field that described deformation video data is replaced in described first video described in step S204:
In step S301, delete the image of the described view field in described first video frame by frame.
In step s 302, according to the position of described view field in described shooting area, fill up described view field with the image of described deformation video data frame by frame.
In embodiments of the present invention, because the first video is identical with the frame per second of projection source video, and deformation video data is obtained by projection source video distortion, and therefore, deformation video data is identical with the frame per second of the first video.Therefore, in the first video, every two field picture of view field all can cover with the image of frame corresponding in deformation video data.Scratch the image except the view field in the first video frame by frame, then fill up the region scratched and remove with the image of frame corresponding in deformation video data, the second video can be obtained.
Further, the frame parameter of described view field comprises the size and shape of described view field.
The specific implementation flow chart of the deformation of every two field picture of described projection source video is controlled according to described frame parameter, with reference to Fig. 4 described in the photographing process method step S203 that Fig. 4 shows view field in the multi-media classroom that the embodiment of the present invention provides:
The deformation controlling every two field picture of described projection source video described in step S203 according to described frame parameter comprises:
In step S401, according to the size of described view field, calculate the zooming parameter of described projection source video, control the convergent-divergent of every two field picture of described projection source video according to described zooming parameter.
In step S402, according to the shape of described view field, calculate the deformation parameter of described projection source video, control the deformation of every two field picture of described projection source video according to described deformation parameter.
As one embodiment of the present of invention, go out the size and shape of view field in the first video according to user's Manual Logos, then the size and shape of the view field gone out according to user's Manual Logos, control convergent-divergent and the deformation of every two field picture of projection source video.
As an alternative embodiment of the invention, according to the luminance difference of view field and other shooting areas, judge the size and shape of view field, then according to the size and shape of view field judged, control convergent-divergent and the deformation of every two field picture of projection source video.
According to the exposure demand in described lecturer region described in the photographing process method step S202 that Fig. 5 shows view field in the multi-media classroom that the embodiment of the present invention provides, to the specific implementation flow chart that described shooting area exposes, with reference to Fig. 5:
Preferably, according to the exposure demand in described lecturer region described in step S202, exposure is carried out to described shooting area and comprises:
In step S501, according to the brightness of lecturer's face in described lecturer region, determine the exposure demand in described lecturer region.
In step S502, using the exposure demand of the exposure demand in described lecturer region as described shooting area, described shooting area is exposed.
In embodiments of the present invention, in order to clap the facial expression knowing lecturer, with the brightness of lecturer's face for foundation, determine the exposure demand in lecturer region, then using the exposure demand of the exposure demand in lecturer region as shooting area, to expose shooting area.
The embodiment of the present invention is by multi-media classroom, with the exposure demand in lecturer region for benchmark exposes shooting area, take the first video, again according to the frame parameter of view field in the first video, the deformation controlling every two field picture of projection source video obtains deformation video data, and replace the view field in the first video with deformation video data, obtain the second video that the equal brightness in lecturer region and view field is suitable thus, thus solve the unsharp problem of the project content caused because view field is over-exposed in the shooting of multi-media classroom.
Fig. 6 shows the structured flowchart of the photographing process device of view field in the multi-media classroom that the embodiment of the present invention provides, and this device may be used for the photographing process method of view field in the multi-media classroom described in service chart 2 to Fig. 5.For convenience of explanation, illustrate only part related to the present embodiment.
With reference to Fig. 6, this device comprises:
Shooting area locating module 61, in described multi-media classroom, location shooting area, described shooting area comprises lecturer region and view field.
First video capture module 62, according to the exposure demand in described lecturer region, exposes described shooting area, and shooting obtains the first video.
Deformation video data acquisition module 63, acquired projections source video, obtains the frame parameter of the view field in described first video, controls the deformation of every two field picture of described projection source video, obtain deformation video data according to described frame parameter.
Replacement module 64, replaces the described view field in described first video with described deformation video data, obtains the second video.
Further, described replacement module 64 comprises:
Delete submodule, delete the image of the described view field in described first video frame by frame.
Fill up submodule, according to the position of described view field in described shooting area, fill up described view field with the image of described deformation video data frame by frame.
Further, the frame parameter of described view field comprises the size and shape of described view field;
Described deformation video data acquisition module 63 comprises:
Convergent-divergent submodule, according to the size of described view field, calculates the zooming parameter of described projection source video, controls the convergent-divergent of every two field picture of described projection source video according to described zooming parameter;
Deformation submodule, according to the shape of described view field, calculates the deformation parameter of described projection source video, controls the deformation of every two field picture of described projection source video according to described deformation parameter.
Preferably, described first video capture module 62 comprises:
Exposure demand determination submodule, according to the brightness of lecturer's face in described lecturer region, determines the exposure demand in described lecturer region;
Exposure submodule, using the exposure demand of the exposure demand in described lecturer region as described shooting area, exposes described shooting area.
Further, described projection source video is identical with the frame per second of described first video.
The embodiment of the present invention is by multi-media classroom, with the exposure demand in lecturer region for benchmark exposes shooting area, take the first video, again according to the frame parameter of view field in the first video, the deformation controlling every two field picture of projection source video obtains deformation video data, and replace the view field in the first video with deformation video data, obtain the second video that the equal brightness in lecturer region and view field is suitable thus, thus solve the unsharp problem of the project content caused because view field is over-exposed in the shooting of multi-media classroom.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the photographing process method of view field in multi-media classroom, is characterized in that, comprising:
In described multi-media classroom, location shooting area, described shooting area comprises lecturer region and view field;
According to the exposure demand in described lecturer region, described shooting area is exposed, and shooting obtains the first video;
Acquired projections source video, obtains the frame parameter of the view field in described first video, controls the deformation of every two field picture of described projection source video, obtain deformation video data according to described frame parameter;
Replace the described view field in described first video with described deformation video data, obtain the second video.
2. the method for claim 1, is characterized in that, describedly comprises with the described view field that described deformation video data is replaced in described first video:
Delete the image of the described view field in described first video frame by frame;
According to the position of described view field in described shooting area, fill up described view field with the image of described deformation video data frame by frame.
3. the method for claim 1, is characterized in that, the frame parameter of described view field comprises the size and shape of described view field;
The described deformation controlling every two field picture of described projection source video according to described frame parameter comprises:
According to the size of described view field, calculate the zooming parameter of described projection source video, control the convergent-divergent of every two field picture of described projection source video according to described zooming parameter;
According to the shape of described view field, calculate the deformation parameter of described projection source video, control the deformation of every two field picture of described projection source video according to described deformation parameter.
4. the method for claim 1, is characterized in that, the described exposure demand according to described lecturer region, carries out exposure comprise described shooting area:
According to the brightness of lecturer's face in described lecturer region, determine the exposure demand in described lecturer region;
Using the exposure demand of the exposure demand in described lecturer region as described shooting area, described shooting area is exposed.
5. the method as described in any one of Claims 1-4, is characterized in that, described projection source video is identical with the frame per second of described first video.
6. the photographing process device of view field in multi-media classroom, is characterized in that, comprising:
Shooting area locating module, in described multi-media classroom, location shooting area, described shooting area comprises lecturer region and view field;
First video capture module, for the exposure demand according to described lecturer region, exposes described shooting area, and shooting obtains the first video;
Deformation video data acquisition module, for acquired projections source video, obtains the frame parameter of the view field in described first video, controls the deformation of every two field picture of described projection source video, obtain deformation video data according to described frame parameter;
Replacement module, for replacing the described view field in described first video with described deformation video data, obtains the second video.
7. device as claimed in claim 6, it is characterized in that, described replacement module comprises:
Delete submodule, for deleting the image of the described view field in described first video frame by frame;
Fill up submodule, for according to the position of described view field in described shooting area, fill up described view field with the image of described deformation video data frame by frame.
8. device as claimed in claim 6, it is characterized in that, the frame parameter of described view field comprises the size and shape of described view field;
Described deformation video data acquisition module comprises:
Convergent-divergent submodule, for the size according to described view field, calculates the zooming parameter of described projection source video, controls the convergent-divergent of every two field picture of described projection source video according to described zooming parameter;
Deformation submodule, for the shape according to described view field, calculates the deformation parameter of described projection source video, controls the deformation of every two field picture of described projection source video according to described deformation parameter.
9. device as claimed in claim 6, it is characterized in that, described first video capture module comprises:
Exposure demand determination submodule, for the brightness according to lecturer's face in described lecturer region, determines the exposure demand in described lecturer region;
Exposure submodule, for using the exposure demand of the exposure demand in described lecturer region as described shooting area, exposes described shooting area.
10. the device as described in any one of claim 6 to 9, is characterized in that, described projection source video is identical with the frame per second of described first video.
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| CN105245784B (en) | 2018-07-20 |
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