CN105791705B - Video anti-fluttering method, system and camera terminal suitable for mobile time-lapse photography - Google Patents

Video anti-fluttering method, system and camera terminal suitable for mobile time-lapse photography Download PDF

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CN105791705B
CN105791705B CN201610357076.9A CN201610357076A CN105791705B CN 105791705 B CN105791705 B CN 105791705B CN 201610357076 A CN201610357076 A CN 201610357076A CN 105791705 B CN105791705 B CN 105791705B
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video
frame
homography matrix
key
key point
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CN105791705A (en
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余清洲
傅松林
许清泉
张伟
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Xiamen Meitu Technology Co Ltd
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Xiamen Meitu Technology Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60Control of cameras or camera modules
    • H04N23/68Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/681Motion detection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60Control of cameras or camera modules
    • H04N23/68Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/681Motion detection
    • H04N23/6811Motion detection based on the image signal

Abstract

The invention discloses a kind of video anti-fluttering methods suitable for mobile time-lapse photography, system and camera terminal, it carries out key point extraction by the picture frame to video to be processed and key point matches, the homography matrix between the adjacent image frame is calculated according to the matched result of key point, and the motion profile of the video to be processed is calculated according to the homography matrix of the adjacent image frame, then the key frame in the picture frame of video to be processed is extracted according to the motion profile, the homography matrix of the key frame is smoothed to obtain and stablizes video, it only utilizes video image information, it carries out taking out frame and smoothing processing in conjunction with the key point information and homography relationship of image, hardware is not depended on, algorithm robustness is high, anti-shake effect is significant, especially suitable for shaking biggish mobile time-lapse photography, and it also fits Stabilization for ordinary video is handled.

Description

Video anti-fluttering method, system and camera terminal suitable for mobile time-lapse photography
Technical field
The present invention relates to technical field of video processing, especially a kind of video stabilization side suitable for mobile time-lapse photography The system of method and its application this method, camera terminal.
Background technique
Mobile time-lapse photography is a branch of time-lapse photography, is a kind of fast-changing photography hand of performance photographic subjects Method has extremely strong time compressed capability, prolonged things can be changed in compression in a short period of time and be displayed.With Traditional time-lapse photography is different using the equipment such as tripod fixed camera, and mobile time-lapse photography is during shooting, camera Equal capture apparatus are mostly man-hour manually hand-held, and track shot person constantly moves.Due to the unstability and compression view of hand-held photography The process of frequency time will cause the irregular high dither phenomenon of photographic.In order to improve the shooting effect of mobile time-lapse photography Fruit needs to carry out stabilization processing to shooting video.
In the video anti-fluttering method of the prior art, generally by the gyro data and video figure for obtaining mobile device As data, then video image data is compensated in turn according to the motion conditions of gyro data estimation mobile device, is cut out The processing such as cut.This stabilization mode based on gyroscope is to the more demanding of hardware, situations such as being easy to appear zero and float, be delayed, and It is undesirable for the anti-shake effect significantly shaken.
Summary of the invention
The present invention is to solve the above problems, providing a kind of video anti-fluttering method suitable for mobile time-lapse photography, being System and camera terminal mainly utilize video image information, do not depend on hardware, algorithm robustness is higher, for different scenes Video image stabilization processing all have preferable effect.
To achieve the above object, the technical solution adopted by the present invention are as follows:
Firstly, the present invention provides a kind of video anti-fluttering method suitable for mobile time-lapse photography comprising following steps:
10. the picture frame of pair video to be processed carries out key point extraction;
20. carrying out key point matching to adjacent image frame according to extracted key point;
30. matched according to the key point as a result, calculating the homography matrix between the adjacent image frame;
40. calculating the motion profile of the video to be processed according to the homography matrix of the adjacent image frame;
50. extracting the key frame in the picture frame of video to be processed according to the motion profile;
60. the homography matrix of pair key frame is smoothed, obtain stablizing video.
Preferably, in the step 10, key point extraction is carried out to the picture frame of video to be processed, be by traversal to Each frame picture frame of video is handled, and each pixel and neighbor pixel of described image frame are carried out to the ratio of gray value Compared with, and according to the label of the gray scale difference value of each pixel and neighbor pixel progress key point.
Preferably, in the step 20, key point matching is carried out to adjacent image frame, further comprises:
21. calculating the histogram of gradients of current key neighborhood of a point range, and using the histogram of gradients as current key The descriptor of point;
22. carrying out of similitude to the correspondence key point of the adjacent image frame according to the descriptor of the key point Match.
Preferably, in the step 30, homography matrix between the adjacent image frame is by described adjacent The correspondence key point of picture frame to match carries out the calculating of linear transformation, obtains the homography square between the adjacent image frame Battle array, calculation formula are as follows:
X ,=Hx;
Wherein, x, is the set of keypoints of picture frame to be matched, and x is the corresponding set of keypoints of reference image frame, H For the homography matrix.
Preferably, in the step 40, the view to be processed is calculated according to the homography matrix of the adjacent image frame The motion profile of frequency is to handle to obtain institute by the way that the homography matrix of all picture frames before current image frame is carried out multiplication The motion state of current image frame is stated, so that the motion state of each picture frame of the video to be processed is calculated, finally The motion state of each picture frame is fitted to obtain the motion profile of the video to be processed.
Preferably, in the step 50, the pass in the picture frame of video to be processed is extracted according to the motion profile Key frame calculates the spacing distance of key frame to be extracted yet further still according to the acceleration degree of time-lapse photography, according to the movement Track and the spacing distance carry out the extraction of key frame.
Preferably, in the step 60, the calculation formula of the homography matrix of the key frame is as follows:
Wherein, h indicates the homography matrix of three rows three column, and the index number 1,2,3 of h indicates the homography matrix The 1st, 2,3 rows, T indicates that the transposition of the homography matrix, x, y indicate the respective pixel before the affine transformation of the key frame The coordinate value of point, the coordinate value of the corresponding pixel points after the affine transformation of x ', y ' the expression key frame.
Preferably, in the step 60, the homography matrix of the key frame is smoothed, is by that will put down Sliding treated that homography matrix obtains amendment transformation matrix divided by the homography matrix before smoothing processing, and uses the amendment Transformation matrix carries out interpolation calculation to the key frame, obtains stablizing video.
Secondly, the present invention provides a kind of video stabilization system suitable for mobile time-lapse photography comprising:
Key point extraction module carries out key point extraction for the picture frame to video to be processed;
Key point matching module carries out key point matching to adjacent image frame according to extracted key point;
Homography matrix solves module, matched according to the key point as a result, calculating the adjacent image frame Between homography matrix;
Motion profile solves module, according to the homography matrix of the adjacent image frame, calculates the video to be processed Motion profile;
Key Frame Extraction module extracts the key frame in the picture frame of video to be processed according to the motion profile;
Smoothing module is smoothed for the homography matrix to the key frame, obtains stablizing video.
In addition, the present invention also provides a kind of camera terminals comprising be suitable for mobile time-lapse photography as described above Video stabilization system.
The beneficial effects of the present invention are:
A kind of video anti-fluttering method, system and camera terminal suitable for mobile time-lapse photography of the invention, passes through Key point extraction and key point matching are carried out to the picture frame of video to be processed, calculated according to the result of the Feature Points Matching Homography matrix between the adjacent image frame out, and it is described wait locate according to the calculating of the homography matrix of the adjacent image frame The motion profile for managing video, then extracts the key frame in the picture frame of video to be processed, to institute according to the motion profile The homography matrix for stating key frame, which is smoothed to obtain, stablizes video, video image information is only utilized, in conjunction with image Key point information and homography relationship carry out taking out frame and smoothing processing, do not depend on hardware, and algorithm robustness is high, and anti-shake effect is aobvious It writes, especially suitable for shaking biggish mobile time-lapse photography, and is also applied for the stabilization processing of ordinary video.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the general flow chart for the video anti-fluttering method that the present invention is suitable for mobile time-lapse photography;
Fig. 2 is the structural schematic diagram for the video stabilization system that the present invention is suitable for mobile time-lapse photography.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiment of the present invention, instead of all the embodiments.It should be appreciated that specific embodiment described herein is only to solve The present invention is released, is not intended to limit the present invention.Based on the embodiments of the present invention, those of ordinary skill in the art are not making Every other embodiment obtained, shall fall within the protection scope of the present invention under the premise of creative work.
As shown in Figure 1, a kind of video anti-fluttering method suitable for mobile time-lapse photography of the invention comprising following step It is rapid:
10. the picture frame of pair video to be processed carries out key point extraction;
20. carrying out key point matching to adjacent image frame according to extracted key point;
30. matched according to the key point as a result, calculating the homography matrix between the adjacent image frame;
40. calculating the motion profile of the video to be processed according to the homography matrix of the adjacent image frame;
50. extracting the key frame in the picture frame of video to be processed according to the motion profile;
60. the homography matrix of pair key frame is smoothed, obtain stablizing video.
In the step 10, key point extraction is carried out to the picture frame of video to be processed, is by traversing view to be processed Each frame picture frame of frequency, and by each pixel of described image frame compared with neighbor pixel carries out gray value, and root The label of key point is carried out according to the gray scale difference value of each pixel and neighbor pixel.The extracting method of image key points can be with Using the other methods of the prior art, such as SIFT critical point detection can also be used, by using laplacian image gold Word tower and gaussian filtering difference image quickly to seek the extreme value in Laplacian space.
In the step 20, key point matching is carried out to adjacent image frame, mainly according to the correspondence of adjacent image frame The similitude of key point is matched, in the present embodiment, using following steps:
21. calculating the histogram of gradients of current key neighborhood of a point range, and using the histogram of gradients as current key The descriptor of point;
22. carrying out of similitude to the correspondence key point of the adjacent image frame according to the descriptor of the key point Match.
In the step 30, homography matrix between the adjacent image frame is by the adjacent image frame The correspondence key point that matches carry out the calculating of linear transformation, obtain the homography matrix between the adjacent image frame, count It is as follows to calculate formula:
X ,=Hx;
Wherein, x, is the set of keypoints of picture frame to be matched, and x is the corresponding set of keypoints of reference image frame, H It is here by converting the coordinate of the correspondence key point of picture frame and reference image frame to be matched for the homography matrix Secondary coordinate system, and the homography relationship between corresponding key point is calculated using least square method.
Alternatively, the present invention can also obtain the homography between the adjacent image frame using the calculating of nonlinear transformation Matrix, such as by cutting image, it is assumed that it is cut into the fritter of 10 rows 10 column, one is calculated to each fritter Homography matrix can make the matching effect of image finer in this way, can achieve better anti-shake effect, but operand is very Greatly;Alternatively, can also be weighted by different types of homography matrix, such as affine transformation matrix with similitude transformation matrix Summation can be anti-shake effect more robust, be not in big pattern distortion as final homography matrix.
In the step 40, the movement of the video to be processed is calculated according to the homography matrix of the adjacent image frame Track is to handle to obtain the current figure by the way that the homography matrix of all picture frames before current image frame is carried out multiplication As the motion state of frame, so that the motion state of each picture frame of the video to be processed is calculated, finally by each figure As the motion state of frame is fitted to obtain the motion profile of the video to be processed.Homography matrix is indicated between consecutive frame Variation relation, i.e. some translations, rotation, the variation of scaling of the next frame relative to previous frame, by the fortune for adding up each frame Dynamic variation, to fit complete motion profile.The process that homography matrix calculates motion profile is exactly constantly to tire out to multiply singly to answer Property matrix just pass through tired 1 Dao the n a homography matrix for multiplying front for example, to calculate n-th frame image state in which.
In the step 50, the key frame in the picture frame of video to be processed is extracted according to the motion profile, also The spacing distance that key frame to be extracted is further calculated according to the acceleration degree of time-lapse photography, according to the motion profile and institute State the extraction that spacing distance carries out key frame.Common time-lapse photography video is to carry out pumping frame according to fixed spacing distance, than If setting and accelerating 2 times, it is exactly to extract an image every a frame exactly to take out a frame for video, loses a frame, take out one Frame, as soon as to frame, the video ultimately produced forms the effect put fastly, and the pumping frame method of this simple violence in visual effect It will lead to the huge shake between consecutive frame.The present invention carries out the pumping of key frame according to the motion profile and the spacing distance It takes, stable video effect can be obtained.
In the step 60, the calculation formula of the homography matrix of the key frame is as follows:
Wherein, h indicates the homography matrix of three rows three column, and the index number 1,2,3 of h indicates the homography matrix The 1st, 2,3 rows, T indicates that the transposition of the homography matrix, x, y indicate the respective pixel before the affine transformation of the key frame The coordinate value of point, the coordinate value of the corresponding pixel points after the affine transformation of x ', y ' the expression key frame.
In the step 60, the homography matrix of the key frame is smoothed, is by by smoothing processing Homography matrix afterwards obtains amendment transformation matrix divided by the homography matrix before smoothing processing, and converts square using the amendment Battle array carries out interpolation calculation to the key frame, obtains stablizing video.
As shown in Fig. 2, the present invention also provides a kind of video stabilization system 100 suitable for mobile time-lapse photography, packet It includes:
Key point extraction module 101 carries out key point extraction for the picture frame to video to be processed;
Key point matching module 102 carries out key point matching to adjacent image frame according to extracted key point;
Homography matrix solves module 103, matched according to the key point as a result, calculating the adjacent image Homography matrix between frame;
Motion profile solves module 104, according to the homography matrix of the adjacent image frame, calculates the view to be processed The motion profile of frequency;
Key Frame Extraction module 105 extracts the key in the picture frame of video to be processed according to the motion profile Frame;
Smoothing module 106 is smoothed for the homography matrix to the key frame, obtains stablizing view Frequently.
In addition, the camera terminal includes prolonging as described above suitable for movable type the present invention also provides a kind of camera terminal When the video stabilization system photographed, wherein the video stabilization system suitable for mobile time-lapse photography can use Fig. 2 embodiment Structure accordingly can execute the technical solution of embodiment of the method shown in Fig. 1, it is similar that the realization principle and technical effect are similar, It may refer to the related record in above-described embodiment in detail, details are not described herein again.
The camera terminal includes: the equipment that mobile phone, digital camera or tablet computer etc. are configured with camera.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For system embodiment and terminal embodiment, since it is basically similar to the method embodiment, so be described relatively simple, The relevent part can refer to the partial explaination of embodiments of method.Also, herein, the terms "include", "comprise" or its What his variant is intended to non-exclusive inclusion, so that including the process, methods of a series of elements, article or setting Standby includes not only those elements, but also including other elements that are not explicitly listed, or further includes for this process, side Method, article or the intrinsic element of equipment.In the absence of more restrictions, limited by sentence "including a ..." Element, it is not excluded that there is also other identical elements in the process, method, article or apparatus that includes the element.Separately Outside, those of ordinary skill in the art will appreciate that realizing that all or part of the steps of above-described embodiment can be by hardware come complete At relevant hardware can also being instructed to complete by program, the program can store in a kind of computer-readable storage In medium, storage medium mentioned above can be read-only memory, disk or CD etc..
The preferred embodiment of the present invention has shown and described in above description, it should be understood that the present invention is not limited to this paper institute The form of disclosure, should not be regarded as an exclusion of other examples, and can be used for other combinations, modifications, and environments, and energy Enough in this paper invented the scope of the idea, modifications can be made through the above teachings or related fields of technology or knowledge.And people from this field The modifications and changes that member is carried out do not depart from the spirit and scope of the present invention, then all should be in the protection of appended claims of the present invention In range.

Claims (9)

1. a kind of video anti-fluttering method suitable for mobile time-lapse photography, which comprises the following steps:
10. the picture frame of pair video to be processed carries out key point extraction;
20. carrying out key point matching to adjacent image frame according to extracted key point;
30. matched according to the key point as a result, calculating the homography matrix between the adjacent image frame;
40. calculating the motion profile of the video to be processed according to the homography matrix of the adjacent image frame;
50. extracting the key frame in the picture frame of video to be processed according to the motion profile, taken the photograph yet further still according to delay The acceleration degree of shadow calculates the spacing distance of key frame to be extracted, is closed according to the motion profile and the spacing distance The extraction of key frame;
60. the homography matrix of pair key frame is smoothed, obtain stablizing video.
2. a kind of video anti-fluttering method suitable for mobile time-lapse photography according to claim 1, it is characterised in that: institute In the step 10 stated, key point extraction is carried out to the picture frame of video to be processed, is each frame by traversing video to be processed Picture frame, and by each pixel of described image frame compared with neighbor pixel carries out gray value, and according to each pixel Point carries out the label of key point with the gray scale difference value of neighbor pixel.
3. a kind of video anti-fluttering method suitable for mobile time-lapse photography according to claim 1, it is characterised in that: institute In the step 20 stated, key point matching is carried out to adjacent image frame, further comprises:
21. calculating the histogram of gradients of current key neighborhood of a point range, and using the histogram of gradients as current key point Descriptor;
22. carrying out the matching of similitude to the correspondence key point of the adjacent image frame according to the descriptor of the key point.
4. a kind of video anti-fluttering method suitable for mobile time-lapse photography according to claim 1, it is characterised in that: institute In the step 30 stated, homography matrix between the adjacent image frame is by matching to the adjacent image frame Corresponding key point carries out the calculating of linear transformation, obtains the homography matrix between the adjacent image frame, calculation formula is as follows: X '=Hx;
Wherein, x ' is the set of keypoints of picture frame to be matched, and x is the corresponding set of keypoints of reference image frame, and H is institute The homography matrix stated.
5. a kind of video anti-fluttering method suitable for mobile time-lapse photography according to claim 1, it is characterised in that: institute In the step 40 stated, the motion profile of the video to be processed is calculated according to the homography matrix of the adjacent image frame, is logical It crosses and the homography matrix of all picture frames before current image frame is subjected to multiplication handles to obtain the fortune of the current image frame Dynamic state, so that the motion state of each picture frame of the video to be processed is calculated, finally by the fortune of each picture frame Dynamic state is fitted to obtain the motion profile of the video to be processed.
6. a kind of video anti-fluttering method suitable for mobile time-lapse photography according to any one of claims 1 to 5, special Sign is: in the step 60, the calculation formula of the homography matrix of the key frame is as follows:
Wherein, h indicates the homography matrix of three rows three column, and the index number 1,2,3 of h indicates the of the homography matrix 1,2,3 row, T indicate that the transposition of the homography matrix, x, y indicate the corresponding pixel points before the affine transformation of the key frame Coordinate value, the coordinate value of the corresponding pixel points after the affine transformation of x ', y ' the expression key frame.
7. a kind of video anti-fluttering method suitable for mobile time-lapse photography according to any one of claims 1 to 5, special Sign is: in the step 60, being smoothed to the homography matrix of the key frame, is by will be after smoothing processing Homography matrix obtain amendment transformation matrix divided by the homography matrix before smoothing processing, and use the amendment transformation matrix Interpolation calculation is carried out to the key frame, obtains stablizing video.
8. a kind of video stabilization system suitable for mobile time-lapse photography characterized by comprising
Key point extraction module carries out key point extraction for the picture frame to video to be processed;
Key point matching module carries out key point matching to adjacent image frame according to extracted key point;
Homography matrix solves module, matched according to the key point as a result, calculating between the adjacent image frame Homography matrix;
Motion profile solves module, according to the homography matrix of the adjacent image frame, calculates the fortune of the video to be processed Dynamic rail mark;
Key Frame Extraction module extracts the key frame in the picture frame of video to be processed according to the motion profile, also into One step calculates the spacing distance of key frame to be extracted according to the acceleration degree of time-lapse photography, according to the motion profile and described The extraction of spacing distance progress key frame;
Smoothing module is smoothed for the homography matrix to the key frame, obtains stablizing video.
9. a kind of camera terminal, which is characterized in that anti-including the video according to any one of claims 8 for being suitable for mobile time-lapse photography Tremble system.
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