Video image stabilization cutting control method based on motion geometric quantity constrains
A technology of video image stabilization and control method, which is applied in the field of video processing and can solve problems such as low computing efficiency and reduced resolution
Active Publication Date: 2016-12-07
BEIJING INSTITUTE OF TECHNOLOGYGY
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[0005] The purpose of the present invention is to propose a video stabilization and cropping control method based on motion geometric quantity constraints, aiming at the deficiencies of the existing video image stabilization and clipping control method, which have the disadvantages of reduced resolution and low calculation efficiency after clipping
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Embodiment 1
[0115] This embodiment describes the process of cutting and controlling a frame of video;
[0116] figure 1 For the algorithm flowchart of this method and the flowchart of this embodiment, as can be seen from the figure, this method comprises the following steps:
[0117] Step 1) input the cropping percentage, the length of the video frame, the width of the video frame, the center of rotation, the original translation vector and the angle of rotation;
[0118] Specifically in this embodiment, the input cropping percentage is 60%, the length of the video frame is 500, the width of the video frame is 200, the center of rotation is P(120,20), the original translation vector is V(20,5), and the rotation The angle is α=30°;
[0119] Step 2) Calculate horizontal margin and vertical margin and initialize 4 vertex coordinates of video frame and 4 vertex coordinates of clipping window;
[0120] Specifically: Calculate the horizontal margin d according to the formula (1) in step 1.3 ...
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A system supporting a video image stabilization cutting control method based on motion geometric quantity constrains comprises a preprocessing module, a judgment module, a calculation module and an output module. The video image stabilization cutting control method based on motion geometric quantity constrains comprises the steps that 1, the preprocessing module works out vertex coordinates of a video frame and a cutting window; 2, the judgment module judges whether the video frame includes the cutting window or not after rotating and translation changes, and whether the step 3 or the step 7.1 is executed is judged according to a result; 3, a maximum translation vector calculation unit calculates the maximum translation vector; 4, the calculation module translates the cutting window; 5, an optimal rotating angle calculation unit calculates the maximum rotating angles of the four edges of the video frame; 6, an optimal rotating angle calculating unit calculates the optimal rotating angle, capable of being achieved, of the video frame; 7.1, the Boolean value TRUE is output, and the method is completed; 7.2, the Boolean value FALSE is output, the maximum translation vector obtained in the step 3 and the optimal rotating angle obtained in the step 6 are output, and the method is completed.
Description
technical field [0001] The invention relates to a video image stabilization and clipping control method, in particular to a video image stabilization and clipping control method based on motion geometric quantity constraints, and belongs to the field of video processing. Background technique [0002] With the proliferation of cameras on mobile devices, video capture has become easier and easier. However, the videos taken by ordinary users in a sports environment usually have a certain amount of picture shaking, which affects the normal viewing of video content. Video image stabilization technology can effectively enhance the stability of video frame sequences, and has become an important means of eliminating screen shake. In the process of video image stabilization, it is often necessary to perform geometric transformations such as rotation and translation on video frames, so that the transformed frame sequence can meet certain visual stability during playback. However, th...
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Login to View More IPC IPC(8): G06T3/60G06T3/40
CPCG06T3/40G06T3/604G06T2210/22
Inventor 张磊黄华孔馨仪徐欣廷刘云飞何冲冲魏晓翔
Owner BEIJING INSTITUTE OF TECHNOLOGYGY