CN109743511B - Method and system for automatically adjusting display direction of playing picture - Google Patents
Method and system for automatically adjusting display direction of playing picture Download PDFInfo
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Abstract
The invention provides a method and a system for automatically adjusting the display direction of a playing picture. Carrying out object analysis on each frame of image of the video film, comparing the color level distribution curve of at least one object in the adjacent front and back frames of image, judging the object with similar color level distribution curve in the adjacent front and back frames of image as the same object, comparing the azimuth information of the same object in the adjacent front and back frames of image, and judging that the shooting direction of the video film is changed when shooting the next frame of image if the azimuth information of the same object in the next frame of image is changed relative to the previous frame of image; when the shooting direction is changed at the time point corresponding to the next frame of image, the image display direction of each frame of image of the video film at the time point and later is adjusted and then played. The method and the device can locally correct the display direction of the playing picture of the corresponding video film in real time and unlimited times, and are convenient for users to watch the video film normally.
Description
Technical Field
The present invention relates to the field of image information processing, and in particular, to a method and system for automatically adjusting the display direction of a playing screen.
Background
At present, mobile terminals such as mobile phones and the like are used for shooting or recording more and more occasions. If the user rotates the mobile phone in the process of shooting the video film, the picture cannot be automatically corrected when the video is played to a part of the picture shot by the mobile phone in the process of watching the video film subsequently, and the normal watching of the user is not facilitated.
In the prior art, a technology for automatically turning a film by reading EXIF (exchangeable image file format) information or recording a shooting direction during mobile phone shooting in advance exists, but generally, the film can only be turned for the whole film, and different display angles cannot be automatically corrected for a single frame of a partial film. If the angle of each frame of picture is corrected frame by frame through additional film correction software in the later period, time and labor are wasted.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a method for automatically adjusting the display direction of a playback screen.
In order to achieve the above object, the present invention provides a method for automatically adjusting the display direction of a playing screen, which comprises the following steps. Performing object analysis on each frame of image of a video film to obtain object information of at least one object in each frame of image, wherein the object information of the at least one object comprises a color level distribution curve and azimuth information of each object; comparing the color level distribution curves of the at least one object in the adjacent front and back frames of images, wherein the object of which the difference between the color level distribution curves in the adjacent front and back frames of images is smaller than a threshold value is judged as the same object; comparing the orientation information of the same object in the two adjacent frames of images, wherein if the orientation information of the same object in the next frame of image changes relative to the previous frame of image, the shooting direction of the video film is judged to change when the next frame of image is shot; when the shooting direction is changed at the time point corresponding to the next frame of image, the image display direction of each frame of image of the video film at the time point and later is adjusted first and then played or stored.
Preferably, when there are a plurality of the same objects in the two adjacent frames of images, the direction information between the plurality of the same objects in the two adjacent frames of images is compared, wherein if the direction information in the next frame of image changes relative to the previous frame of image, it is determined that the shooting direction of the video film changes when the next frame of image is shot. Further, in two adjacent frames of images, if only the orientation information of a part of the same objects in the plurality of same objects changes and the pointing information does not change, it is determined that the shooting direction of the video film does not change when shooting the next frame of image.
Preferably, the step of analyzing the object for each frame of image of the video film is performed before the video film is played; and when the shooting direction is judged to be changed at the time point corresponding to the next frame of image, the picture display direction of each frame of image of the video film at the time point and later is adjusted first and then the video film is played.
Preferably, the step of analyzing the object for each frame of image of the video film is performed when the video film is shot and stored; when the shooting direction is changed at the time point corresponding to the next frame of image, the image display direction of each frame of image of the video film at the time point and later is adjusted and then stored.
Preferably, the tone scale distribution curve includes a histogram curve corresponding to an image in a region where the object is located; the orientation information comprises the image resolution of the area where the corresponding object is located and the coordinates of the positioning point of the corresponding object.
Preferably, if the horizontal and vertical dimensions of the image resolution of the same object in the next frame of image are interchanged with those of the previous frame of image and the coordinates of the location point of the same object are also changed, it is determined that the shooting direction of the video film is rotated by ninety degrees when the next frame of image is shot. Further, according to the change pattern of the coordinates of the positioning point of the same object in the adjacent next frame image and the previous frame image, it is determined whether the shooting direction of the video film is clockwise or counterclockwise when shooting the next frame image.
Preferably, in the step of adjusting the display direction of each frame of image of the video film at the time point and later, the adjusting is a reverse operation of rotating in a direction opposite to the rotation direction of the determined shooting direction and rotating in an equal angle.
Another objective of the present invention is to provide a system for automatically adjusting the display direction of a playing image.
To achieve the above object, the present invention provides a system for automatically adjusting the display direction of a playing screen. The system comprises an image analysis unit, a first comparison unit, a second comparison unit and an image playing unit. The image analysis unit is used for carrying out object analysis on each frame of image of the video film to obtain object information of at least one object in each frame of image, wherein the object information of the at least one object comprises a color level distribution curve and azimuth information of each object; the first comparison unit is used for comparing the color level distribution curves of the plurality of objects in the adjacent front and back two frames of images, wherein the object of which the difference between the color level distribution curves in the adjacent front and back two frames of images is smaller than a threshold value is judged to be the same object; the second comparison unit is used for comparing the orientation information of the same object in two adjacent frames of images, wherein if the orientation information of the same object in the next frame of image changes relative to the previous frame of image, the shooting direction of the video film is judged to change when the next frame of image is shot; the image playing unit is used for adjusting the image display direction of each frame of image of the video film at the time point and later and then playing or storing the video film when the shooting direction of the video film at the time point corresponding to the next frame of image is judged to be changed.
Preferably, the second comparing unit is further configured to compare the direction information between two adjacent objects in the two adjacent frames of images when there are multiple objects in the two adjacent frames of images, wherein if the direction information in the next frame of image changes relative to the previous frame of image, it is determined that the shooting direction of the video film changes when the next frame of image is shot. Furthermore, the second comparing unit is further configured to determine that the shooting direction of the video film does not change when shooting the next frame of image if only part of the orientation information of the same object in the plurality of the same objects changes and the pointing information does not change in the two adjacent frames of images.
Compared with the prior art, the method and the system for automatically adjusting the display direction of the playing picture can locally correct the display direction of the playing picture of the corresponding video film in real time and unlimited times when the picture rotation phenomenon caused by the change of the shooting direction exists in the playing of the video film; or when the picture rotation phenomenon caused by the change of the shooting direction exists during the shooting of the video film, the display direction of the playing picture of the corresponding video film is locally corrected in real time and unlimited times and stored, so that a user can conveniently and normally watch the video film without rotating the mobile phone.
Drawings
Fig. 1 is a flowchart illustrating a method for automatically adjusting a display direction of a playback screen according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an operation of automatically adjusting the display direction of a playing screen according to an embodiment of the present invention.
Fig. 3A and fig. 3B are schematic diagrams illustrating an operation of automatically adjusting a display direction of a playing screen according to another embodiment of the present invention.
Fig. 4 is a block diagram of a system for automatically adjusting the display direction of a playback screen according to an embodiment of the present invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for automatically adjusting a display direction of a playing screen according to an embodiment of the present invention. The method for automatically adjusting the display direction of the playing picture comprises the following steps.
S1, performing object analysis on each frame of image of the video film to obtain object information of at least one object in each frame of image, wherein the object information of the at least one object includes a color level distribution curve and orientation information of each object. Preferably, the step S1 of performing object analysis on each frame of image of the video film can be performed before playing the video film, so as to reduce the delay caused by the image processing process during playing. Alternatively, the step S1 of analyzing the object for each frame of image of the video film may be performed when the video film is captured and stored, so that the stored video film can be directly opened during playing without image processing. The at least one object may be one or more relatively fixed background items in the video film or a subject scene with distinct distinguishing features.
S2, comparing the color level distribution curves of the at least one object in the two adjacent frames of images, wherein the object whose difference between the color level distribution curves in the two adjacent frames of images is less than the threshold is determined as the same object. Preferably, the tone scale distribution curve includes a histogram curve corresponding to an image in a region where the object is located. Because the histogram curves of the same object in the two adjacent frames of images are very similar and are not influenced by the shape of the object, the relationship of each object in the two adjacent frames of images can be obtained by comparing the color gradation distribution curves, and the same object corresponding to the same shot object can be found out.
S3, comparing the orientation information of the same object in the two adjacent frames of images, wherein if the orientation information of the same object in the next frame of image changes relative to the previous frame of image, it is determined that the shooting direction of the video film changes when shooting the next frame of image. Preferably, the orientation information includes an image resolution of an area where the corresponding object is located and coordinates of a positioning point of the corresponding object. For example, an object in the image is located in the region of MxN pixels, and the coordinates of the location point (e.g., the salient feature point of the object or the center point of the region) are (x, y).
Referring to fig. 2, fig. 2 is a schematic diagram illustrating an operation of automatically adjusting a display direction of a playing screen according to an embodiment of the present invention. In an embodiment, if the horizontal and vertical dimensions of the image resolution of the same object 201 or 202 in the next frame image 102 are interchanged with those of the previous frame image 101 and the coordinates of the anchor point of the same object 201 or 202 are also changed, it is determined that the shooting direction of the video film is rotated by ninety degrees when the next frame image 102 is shot. Preferably, it is determined whether the shooting direction of the video film is clockwise or counterclockwise when shooting the next frame image 102 according to the change pattern of the coordinates of the positioning points of the same object 201 and/or 202 in the adjacent next frame image 102 and the previous frame image 101. Specifically, from the fact that the horizontal and vertical axis coordinate values of the positioning point coordinates of the same object 201 and/or 202 become larger or smaller, it can be determined whether the shooting direction is rotating clockwise or counterclockwise. For example, in the previous frame of image 101, the image resolution of the same object 201 is 200x300, the upper left corner is the origin of coordinates, the coordinates of the anchor point (e.g., the center point of the area where the object is located) is (525,1485), the image resolution of the same object 202 is 570x170, and the coordinates of the anchor point (e.g., the center point of the area where the object is located) is (550,1785); in the next frame of image 102, the image resolution of the same object 201 becomes 300x200, the coordinates of its anchor point (e.g., the center of the area where the object is located) becomes 625,1020, the image resolution of the same object 202 becomes 170x570, and the coordinates of its anchor point (e.g., the center of the area where the object is located) becomes 925,995; it can be determined that the video film was shot with a ninety-degree counterclockwise rotation when the next frame of image 102 was shot.
S4, whenever the shooting direction is changed at the time point corresponding to the next frame of image, the display direction of each frame of image of the video film at the time point and later is adjusted and then played or stored. Generally, in the step of adjusting the display direction of each frame of image of the video film at the time point and later, the adjustment refers to a reverse operation that is opposite to the rotation direction when the shooting direction is changed and equal to the rotation angle, for example, if it is determined that the shooting direction of the video film is rotated ninety degrees counterclockwise when shooting the next frame of image 102, the display direction of each frame of image of the video film at the time point and later is rotated ninety degrees clockwise (or rotated two hundred seventy degrees counterclockwise) for adjustment. Preferably, the display or the storage can be correspondingly matched according to the current screen setting mode, for example, correspondingly scaled, stretched or filled with a lower black border, which is a technique known in the art and is not described herein.
Preferably, steps S2 to S3 may also be performed before playing the video film, so that the delay in the playing process due to the image processing process can be further reduced. Since the video film may rotate the shooting direction many times during the shooting process, step S4 can be executed in a loop, that is, the display direction of the picture is adjusted once before and after each time the shooting direction changes, and then the playing is continued.
Preferably, steps S2 to S3 are also performed when the video film is captured and stored, so that the captured video film can be stored as a video film with a consistent playing direction, and thus, the better viewing effect can be obtained by directly opening the stored video film during playing without performing additional image processing and the like. Similarly, since the video film may rotate the shooting direction many times during the shooting process, step S4 can be executed in a loop, that is, the picture display direction is adjusted once and then stored at the time point when the shooting direction changes each time.
Referring to fig. 3A and 3B, fig. 3A and 3B are schematic diagrams illustrating an operation of automatically adjusting a display direction of a playing screen according to another embodiment of the present invention. In step S3 of an embodiment, when there are a plurality of the same objects in two adjacent frames of images, three same objects in this embodiment are respectively defined as the first same object 301, the second same object 302 and the third same object 303, and the directional information a1, a2 and A3 between two same objects (i.e. the first same object 301, the second same object 302 and the third same object 303) in two adjacent frames of images are compared, wherein if the directional information a1, a2 and A3 in the next frame of image changes relative to the previous frame of image, it is determined that the shooting direction of the video film changes when the next frame of image is shot, as shown in fig. 3A, when it is determined that the shooting direction rotates clockwise by 90 degrees, the frame display direction rotates counterclockwise by 90 degrees first and then plays the video film. The pointing information can be a vector direction between two positioning points of the same object, and the change of the pointing information means that the angle change of the vector direction exceeds a preset range. Preferably, as shown in fig. 3B, in two adjacent frames of images, if the orientation information of only a part of the same objects (e.g. only the second same object 302) in the plurality of same objects (the first same object 301, the second same object 302, and the third same object 303) changes and the pointing information a1, a2, A3 does not substantially change, it is determined that the shooting direction of the video film is not changed when the next frame of image is shot; in this case, it is likely that only one object is rotated when being photographed, but not the photographing direction.
Referring to fig. 4, fig. 4 is a block diagram of a system for automatically adjusting the display direction of a playing screen according to an embodiment of the present invention. The system for automatically adjusting the display direction of the playing picture comprises an image analysis unit 1, a first comparison unit 2, a second comparison unit 3 and an image playing unit 4.
The image analysis unit 1 is configured to perform object analysis on each frame of image of the video film to obtain object information of at least one object in each frame of image, where the object information of the at least one object includes a color level distribution curve and azimuth information of each object. Preferably, the tone scale distribution curve includes a histogram curve corresponding to an image in a region where the object is located; the orientation information comprises the image resolution of the area where the corresponding object is located and the coordinates of the positioning point of the corresponding object.
The first comparison unit 2 is configured to compare the color gradation distribution curves of the plurality of objects in the two adjacent frames of images, wherein the object whose difference between the color gradation distribution curves in the two adjacent frames of images is smaller than a threshold is determined as the same object.
The second comparing unit 3 is configured to compare the orientation information of the same object in two adjacent frames of images, wherein if the orientation information of the same object in the next frame of image changes relative to the previous frame of image, it is determined that the shooting direction of the video film changes when the next frame of image is shot.
In an embodiment, the second comparing unit 3 is further configured to compare the direction information between two adjacent objects in the two adjacent frames of images when there are multiple objects in the two adjacent frames of images, wherein if the direction information in the next frame of image changes relative to the previous frame of image, it is determined that the shooting direction of the video film changes when the next frame of image is shot. Preferably, the second comparing unit 3 is further configured to determine that the shooting direction of the video film is not changed when shooting the next frame of image if only the orientation information of a part of the same objects in the plurality of same objects is changed and the pointing information is not changed in two adjacent frames of images.
The image playing unit 4 is used for adjusting the image display direction of each frame of image of the video film at the time point and later and then playing or storing the video film when the shooting direction at the time point corresponding to the next frame of image is judged to be changed.
In an embodiment, the second comparing unit 3 is further configured to determine that the shooting direction of the video film is rotated by ninety degrees when the next frame of image is shot when the horizontal and vertical dimensions of the image resolution of the same object in the next frame of image are interchanged with respect to the previous frame of image and the coordinates of the positioning point of the same object are also changed. Preferably, the second comparing unit 3 is further configured to determine whether the shooting direction of the video film is clockwise or counterclockwise when shooting the next frame of image according to the variation pattern of the coordinates of the positioning point of the same object in the adjacent next frame of image and the adjacent previous frame of image.
The same technical details as in the above embodiment are also applicable to this embodiment and are not described herein.
The method and the system for automatically adjusting the display direction of the playing picture can locally correct the display direction of the playing picture of the corresponding video film timely and indefinitely when the picture rotation phenomenon caused by the change of the shooting direction exists in the playing of the video film; or when the picture rotation phenomenon caused by the change of the shooting direction exists during the shooting of the video film, the display direction of the playing picture of the corresponding video film is locally corrected in real time and unlimited times and stored, so that a user can conveniently and normally watch the video film without rotating the mobile phone.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (10)
1. A method for automatically adjusting the display direction of a playing picture is characterized by comprising the following steps:
performing object analysis on each frame of image of a video film to obtain object information of at least one object in each frame of image, wherein the object information of the at least one object comprises a color level distribution curve and azimuth information of each object;
comparing the color level distribution curves of the at least one object in the adjacent front and back frames of images, wherein the object of which the difference between the color level distribution curves in the adjacent front and back frames of images is smaller than a threshold value is judged as the same object;
comparing the orientation information of the same object in the two adjacent frames of images, wherein if the orientation information of the same object in the next frame of image changes relative to the previous frame of image, the shooting direction of the video film is judged to change when the next frame of image is shot;
when the shooting direction is changed at the time point corresponding to the next frame of image, the picture display direction of each frame of image of the video film at the time point and later is adjusted and then played or stored;
when the same object in the two adjacent frames of images is multiple, comparing the direction information between every two multiple same objects in the two adjacent frames of images, wherein if the direction information in the next frame of image changes relative to the previous frame of image, the shooting direction of the video film is judged to change when the next frame of image is shot.
2. The method as claimed in claim 1, wherein in two adjacent frames of the previous and subsequent frames, if only a part of the orientation information of the same objects in the plurality of the same objects is changed and the orientation information is not changed, it is determined that the shooting direction of the video film is not changed when the next frame of the video film is shot.
3. The method of claim 1, wherein the step of performing object analysis on each frame of image of the video film is performed before playing the video film; and when the shooting direction is judged to be changed at the time point corresponding to the next frame of image, the picture display direction of each frame of image of the video film at the time point and later is adjusted first and then the video film is played.
4. The method of claim 1, wherein the step of performing object analysis on each frame of image of the video film is performed while the video film is captured and stored; when the shooting direction is changed at the time point corresponding to the next frame of image, the image display direction of each frame of image of the video film at the time point and later is adjusted and then stored.
5. The method of claim 1, wherein the tone scale distribution curve comprises a histogram curve corresponding to an image in a region where the object is located; the orientation information comprises the image resolution of the area where the corresponding object is located and the coordinates of the positioning point of the corresponding object.
6. The method as claimed in claim 5, wherein if the horizontal and vertical dimensions of the image resolution of the same object in the subsequent image are interchanged with those in the previous image and the coordinates of the location point of the same object are changed, it is determined that the video film was rotated by ninety degrees in the shooting direction when the subsequent image was shot.
7. The method of claim 6, wherein the video film is shot clockwise or counterclockwise when the next frame of image is shot according to the variation pattern of coordinates of the positioning point of the same object in the adjacent next frame of image and the previous frame of image.
8. The method as claimed in claim 1, wherein the step of adjusting the display direction of each frame of video at the time point and later is an inverse operation of rotating in the opposite direction and rotating in the same angle as the determined shooting direction when the shooting direction is changed.
9. A system for automatically adjusting the display direction of a playing picture is characterized by comprising:
the image analysis unit is used for carrying out object analysis on each frame of image of the video film to obtain object information of at least one object in each frame of image, wherein the object information of the at least one object comprises a color level distribution curve and azimuth information of each object;
the first comparison unit is used for comparing the color level distribution curves of the at least one object in the adjacent front and back two frames of images, wherein the object of which the difference between the color level distribution curves in the adjacent front and back two frames of images is smaller than a threshold value is judged to be the same object;
the second comparison unit is used for comparing the orientation information of the same object in two adjacent frames of images, wherein if the orientation information of the same object in the next frame of image changes relative to the previous frame of image, the shooting direction of the video film is judged to change when the next frame of image is shot;
the image playing unit is used for adjusting the picture display direction of each frame of image of the video film at the time point and later and then playing or storing the video film when the shooting direction of the video film at the time point corresponding to the next frame of image is judged to be changed;
the second comparison unit is further configured to compare the direction information between every two adjacent same objects in the two adjacent frames of images when the same object in the two adjacent frames of images is multiple, wherein if the direction information in the next frame of image changes relative to the previous frame of image, it is determined that the shooting direction of the video film changes when the next frame of image is shot.
10. The system of claim 9, wherein the second comparing unit is further configured to determine that the shooting direction of the video film is not changed when shooting the next frame of image if the orientation information of only a part of the same objects in the plurality of the same objects is changed and the orientation information is not changed in two adjacent frames of images.
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