Same-track non-uniform speed shooting method

Abstract

The present application relates to a kind of same track unequal speed shooting methods, comprising the following steps: determining the speed ratio of constant speed layer and variable speed layer required for shooting;According to the maximum operating speed of mechanical arm and the speed ratio, the limit operating speed of constant speed layer mechanical arm is calculated;The limit operating speed of constant speed layer mechanical arm and the constant speed layer camera frame rate are input into the preset variable speed layer mechanical arm operating speed calculation formula and variable speed layer camera frame rate calculation formula, and the operating speed of variable speed layer mechanical arm and variable speed layer camera frame rate are obtained;According to the operating speed of constant speed layer mechanical arm and the constant speed layer camera frame rate, constant speed layer character is shot and constant speed layer shooting material is obtained, and according to the operating speed of variable speed layer mechanical arm and the variable speed layer camera frame rate, variable speed layer character is shot and variable speed layer shooting material is obtained.The method can be simply and effectively realized with "same track unequal speed" visual effect mode narrative, and has the possibility and significance breakthrough of replication propagation.

Description

Technical Field

[0001] This invention relates to the field of video processing, and in particular to a method for shooting videos at different speeds along the same trajectory. Background Technology

[0002] In movies, TV series, and commercials, different elements or characters often need to appear on the same screen at different speeds to express a certain symbolism.

[0003] For example, in a war scene, the main force fights at normal speed, while one character is shown in slow motion. This method can clearly show that the character is an important one, and in many war films, it can make the hero's image more realistic.

[0004] In addition, there are many other situations where it is necessary to present a story at different speeds, but such effects cannot be achieved due to technical limitations. Summary of the Invention

[0005] Therefore, it is necessary to provide a method for shooting at different speeds along the same trajectory to address the above-mentioned technical problems. This method can simply and effectively realize storytelling using the visual effect of "different speeds along the same trajectory," making this narrative form and visual effect a breakthrough with the possibility of replication and dissemination.

[0006] This invention provides a method for shooting images at different speeds along the same trajectory, the method comprising:

[0007] Determine the speed ratios required for the constant speed layer and variable speed layer during filming;

[0008] The limited operating speed of the constant-speed layer robotic arm is calculated based on the maximum operating speed of the robotic arm and the speed multiplier.

[0009] The operating speed limit of the constant speed layer robotic arm and the frame rate of the constant speed layer camera are input into the preset calculation formulas for the operating speed of the variable speed layer robotic arm and the frame rate of the variable speed layer camera to obtain the operating speed of the variable speed layer robotic arm and the frame rate of the variable speed layer camera.

[0010] The constant-speed layer character is filmed based on the operating speed of the constant-speed layer robotic arm and the frame rate of the constant-speed layer camera to obtain constant-speed layer filming material, and the variable-speed layer character is filmed based on the operating speed of the variable-speed layer robotic arm and the frame rate of the variable-speed layer camera to obtain variable-speed layer filming material.

[0011] In one embodiment, the speed ratios of the constant speed layer and the variable speed layer are integer multiples.

[0012] In one embodiment, after determining the speed ratios of the constant-speed layer and the variable-speed layer required for filming, the method further includes:

[0013] The robot arm's trajectory is determined based on the character's movement in the constant speed or variable speed layer.

[0014] The assumed ideal speed of the constant-speed layer robot arm is determined based on the robot arm's running trajectory.

[0015] In one embodiment, the method further includes:

[0016] A calculation formula is created to establish the relationship between the operating speed of the variable-speed layer robotic arm and the operating speed of the constant-speed layer robotic arm, and the speed ratio.

[0017] Create a calculation formula between the frame rate of the variable speed layer camera and the frame rate of the constant speed layer camera and the speed multiplier.

[0018] In one embodiment, the formula for calculating the operating speed of the variable-speed layer robotic arm is:

[0019] Hs = Ls × X

[0020] In the formula, Ls represents the operating speed of the robotic arm in the constant-speed layer, and X represents the speed multiplier. In one embodiment, the frame rate of the camera in the variable-speed layer is calculated as follows:

[0021] Hf = Bf × X

[0022] In the formula, Bf represents the frame rate of the constant speed layer camera, and X represents the speed multiplier.

[0023] In one embodiment, the process of filming a character at a constant speed layer based on the operating speed of the constant speed layer robotic arm and the frame rate of the constant speed layer camera to obtain constant speed layer footage, and filming a character at a variable speed layer based on the operating speed of the variable speed layer robotic arm and the frame rate of the variable speed layer camera to obtain variable speed layer footage, further includes:

[0024] The footage shot at the constant speed layer and the footage shot at the variable speed layer are combined using post-production compositing software.

[0025] In one embodiment, the step of compositing the constant-speed layer footage and the variable-speed layer footage using post-production compositing software includes:

[0026] If the shooting method is green screen shooting, then the keying method is used to composite the footage shot in the normal speed layer and the footage shot in the variable speed layer;

[0027] If the shooting method is live-action shooting, then the ROTO method is used to synthesize the footage from the constant speed layer and the footage from the variable speed layer.

[0028] In one embodiment, the step of compositing the constant-speed layer footage and the variable-speed layer footage using post-production compositing software includes:

[0029] If the shooting method is live-action shooting, but the movement of the characters in the normal speed layer and the variable speed layer do not overlap, then a masking method is used to composite the shooting materials of the normal speed layer and the shooting materials of the variable speed layer.

[0030] In one embodiment, the step of compositing the constant-speed layer footage and the variable-speed layer footage using post-production compositing software further includes:

[0031] If ghosting occurs when combining the footage from the constant speed layer and the footage from the variable speed layer, the problem is addressed by dragging the speed across different segments.

[0032] The aforementioned method of shooting at different speeds along the same trajectory first determines the speed ratio between the constant-speed layer and the variable-speed layer based on the creator's concept. Then, based on the maximum operating speed of the robotic arm, the limited operating speed of the constant-speed layer robotic arm is determined. The shooting stage then begins. Using the determined speed ratio between the constant-speed and variable-speed layers and the limited operating speed of the robotic arm, combined with the creator's derived formulas for calculating the operating speed of the variable-speed layer robotic arm and the frame rate of the variable-speed layer camera, the operating speed of the variable-speed layer robotic arm and the frame rate of the variable-speed layer camera can be calculated. Finally, based on the calculated operating speed of the robotic arm and the camera frame rate, the constant-speed layer and the variable-speed layer are filmed separately to obtain footage of the constant-speed layer and footage of the variable-speed layer. Combining these two methods achieves the visual effect of different speeds along the same trajectory desired by the creator. This method can simply and effectively realize storytelling using the "different speeds along the same trajectory" visual effect, making this narrative form and visual effect potentially replicable and significant, representing an innovation and breakthrough in film and television storytelling techniques. Compared to traditional film and television narrative techniques that rely solely on editing to tell a story, also known as "montage," this approach offers a more comprehensive and nuanced approach to storytelling. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is one of the flowcharts of the same trajectory non-uniform speed shooting method provided by the present invention;

[0035] Figure 2 This is the second flowchart of the same trajectory non-uniform speed shooting method provided by the present invention;

[0036] Figure 3 The third flowchart of the same trajectory non-uniform speed shooting method provided by the present invention;

[0037] Figure 4 The fourth flowchart of the same trajectory non-uniform speed shooting method provided by the present invention;

[0038] Figure 5 This is a schematic diagram of the same trajectory non-uniform speed shooting method provided by the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] The following is combined Figures 1 to 5 The present invention describes a method for shooting images at different speeds along the same trajectory.

[0041] like Figure 1 As shown, in one embodiment, a method for shooting images at different speeds along the same trajectory includes the following steps:

[0042] Step S110: Determine the speed ratio of the constant speed layer and the variable speed layer required for shooting.

[0043] Specifically, the speed multiplier in visual effects is usually determined by the creator. That is, the creator first designs and determines the speed multiplier (X) between the normal speed layer characters and the variable speed layer characters according to the needs of the story, for example, X = 5 times.

[0044] Step S120: Calculate the limited operating speed of the constant speed layer robotic arm based on the maximum operating speed and speed ratio of the robotic arm.

[0045] Specifically, the maximum speed for high-speed shooting is the maximum speed of the robotic arm, typically 100, while there is no minimum speed limit. A crucial prerequisite here is determining the maximum speed the robotic arm cannot exceed during camera movement in normal-speed shooting, using the speed magnification factor X. This is essentially the robotic arm's operating speed. Without knowing this parameter, achieving the desired effect in variable-speed shooting may be impossible. For example, if the robotic arm's operating speed Ls in a normal-speed layer is 50 and the magnification factor X is 5, then the robotic arm's operating speed Hs in a variable-speed layer would need to reach 250. However, the robotic arm's maximum speed is only 100, so we need to determine the limit value for this parameter.

[0046] Step S130: Input the limited operating speed of the constant speed layer robotic arm and the frame rate of the constant speed layer camera into the preset calculation formulas for the operating speed and frame rate of the variable speed layer robotic arm to obtain the operating speed and frame rate of the variable speed layer robotic arm.

[0047] Specifically, the preset formulas for calculating the operating speed of the variable-speed layer robotic arm and the frame rate of the variable-speed layer camera were derived from experimental data and their feasibility was verified through multiple experiments. The frame rate of the normal-speed layer camera represents the speed during normal performance filming. Typically, the frame rate for the normal-speed layer camera is 24 for film and 25 or 30 for television depending on the format. However, some films use 48 for film and 50 or 60 for television to facilitate post-production visual effects. Variable speed refers to slow-motion or frame-by-frame shooting, commonly known as slow motion or time-lapse photography effects.

[0048] Step S140: The character in the normal speed layer is filmed according to the running speed of the robot arm in the normal speed layer and the frame rate of the camera in the normal speed layer to obtain normal speed layer filming material; and the character in the variable speed layer is filmed according to the running speed of the robot arm in the variable speed layer and the frame rate of the camera in the variable speed layer to obtain variable speed layer filming material.

[0049] The aforementioned method of shooting at different speeds along the same trajectory first determines the speed ratio between the constant-speed layer and the variable-speed layer based on the creator's concept. Then, based on the maximum operating speed of the robotic arm, the limited operating speed of the constant-speed layer robotic arm is determined. The shooting stage then begins. Using the determined speed ratio between the constant-speed and variable-speed layers and the limited operating speed of the robotic arm, combined with the creator's derived formulas for calculating the operating speed of the variable-speed layer robotic arm and the frame rate of the variable-speed layer camera, the operating speed of the variable-speed layer robotic arm and the frame rate of the variable-speed layer camera can be calculated. Finally, based on the calculated operating speed of the robotic arm and the camera frame rate, the constant-speed layer and the variable-speed layer are filmed separately to obtain footage of the constant-speed layer and footage of the variable-speed layer. Combining these two methods achieves the visual effect of different speeds along the same trajectory desired by the creator. This method can simply and effectively realize storytelling using the "different speeds along the same trajectory" visual effect, making this narrative form and visual effect potentially replicable and significant, representing an innovation and breakthrough in film and television storytelling techniques. Compared to traditional film and television narrative techniques that rely solely on editing to tell a story, also known as "montage," this approach offers a more comprehensive and nuanced approach to storytelling.

[0050] In one embodiment, the same trajectory non-uniform speed shooting method provided by the present invention has the speed ratios of the constant speed layer and the variable speed layer being integer multiples.

[0051] Specifically, setting the speed multipliers of the normal speed layer and the variable speed layer to integers makes calculations easier, especially since the camera's frame rate only supports integer multiples.

[0052] like Figure 2As shown, in one embodiment, the same-track non-uniform-speed shooting method provided by the present invention determines the speed ratio of the constant-speed layer and the variable-speed layer required for shooting, and then further includes the following steps:

[0053] Step S210: Determine the running trajectory of the robotic arm based on the role movement of the constant speed layer or the variable speed layer.

[0054] Specifically, such as Figure 5 As shown, it is necessary to first determine the movement of character A and character B, because it represents the movement or camera trajectory of the robotic arm. Based on the simplicity or complexity of the movement or camera trajectory, the assumed ideal speed of the robotic arm in the constant speed layer can be initially determined.

[0055] Step S220: Determine the assumed ideal speed of the constant speed layer robot arm based on the robot arm's running trajectory.

[0056] like Figure 3 As shown, in one embodiment, the same-track non-uniform-speed shooting method provided by the present invention further includes the following steps:

[0057] Step S310: Create a calculation formula between the operating speed of the variable speed layer robot arm and the operating speed and speed ratio of the constant speed layer robot arm.

[0058] Specifically, the formula for calculating the operating speed of the variable-speed robotic arm is as follows:

[0059] Hs = Ls × X

[0060] In the formula, Ls represents the operating speed of the constant-speed layer robotic arm, and X represents the speed multiplier.

[0061] Step S320: Create a calculation formula between the frame rate of the variable speed layer camera and the frame rate and speed multiplier of the constant speed layer camera.

[0062] Specifically, the formula for calculating the frame rate of the variable speed layer camera is as follows:

[0063] Hf = Bf × X

[0064] In the formula, Bf represents the frame rate of the constant speed layer camera, and X represents the speed multiplier.

[0065] In one embodiment, the same-track non-uniform-speed shooting method provided by the present invention shoots a character at a constant-speed layer based on the operating speed of the robotic arm at a constant-speed layer and the frame rate of the camera at a constant-speed layer to obtain constant-speed layer shooting footage, and shoots a character at a variable-speed layer based on the operating speed of the robotic arm at a variable-speed layer and the frame rate of the camera at a variable-speed layer to obtain variable-speed layer shooting footage, and then further includes the following steps:

[0066] The footage shot at normal speed and the footage shot at variable speed were combined using post-production compositing software.

[0067] Specifically, such as Figure 4 As shown, the process of combining footage shot at constant speed and footage shot at variable speed using post-production compositing software includes the following steps:

[0068] Step S410: If the shooting method is green screen shooting, then the normal speed layer shooting material and the variable speed layer shooting material are composited using the keying method.

[0069] Step S410: If the shooting method is real-scene shooting, then the ROTO method is used to composite the shooting materials of the normal speed layer and the shooting materials of the variable speed layer.

[0070] Step S410: If the shooting method is real-scene shooting, but the movement of the characters in the normal speed layer and the variable speed layer does not overlap, then the normal speed layer shooting material and the variable speed layer shooting material are composited by masking.

[0071] In summary, the specific process of shooting at different speeds along the same trajectory is as follows: The creator designs and determines the speed ratio (X) between the normal speed layer and the variable speed layer according to the needs of the story, for example, X = 5 times; then, the movement of the normal speed character A and the variable speed character B is determined, which represents the camera movement trajectory of the camera robot arm, and this camera movement involves the assumed ideal speed of the normal speed layer; next, the maximum limit value of the operating speed of the operating speed of the operating speed of the operating speed layer robot arm is determined = 100 / 5 = 20, which is the maximum shooting speed that the operating speed of the operating speed of the operating speed layer robot arm must not exceed; based on the two derived formulas: the camera frame rate of the variable speed layer: Hf = Bf × X and the operating speed of the camera robot arm of the variable speed layer: Hs = Ls × X, the camera frame rate at the normal speed of character A is determined, usually set according to international standards, for example: 25 frames / second, and it is assumed that the operating speed of the camera robot arm when shooting character A is 15% of the full performance speed of the robot arm; at this time, the performance of character A is shot according to the above-set parameters. Next, according to the variable speed layer camera frame rate (Hf) = Bf × X, set the camera frame rate (Hf) for shooting character B to 25 * 5 = 250 frames / second; multiply the robotic arm speed when shooting character A by 5, which is 15 * 5 = 75, that is, set the robotic arm's operating speed to 75% of its full performance speed; based on 75% of the robotic arm's operating or camera movement speed, shoot character B's performance at a frame rate of 125 frames / second. The resulting footage length is exactly the same as the footage length when shooting character A, which is convenient for post-production compositing. Finally, combine the footage from the two shooting sessions of character A and character B in the post-production compositing software to complete the process.

[0072] In one embodiment, the same-track non-uniform-speed shooting method provided by the present invention combines constant-speed layer shooting footage and variable-speed layer shooting footage using post-production compositing software, and then further includes the following steps:

[0073] If ghosting occurs when compositing footage shot at normal speed and footage shot at variable speed, the method of splitting the intervals and dragging the speed is used to process it.

[0074] Specifically, if ghosting occurs during compositing at a certain location, it indicates an inconsistency in speed at that point. In this case, simply use the clipping tool to "cut" the clip at the starting point of the ghosting, then use the clip length drag tool within the clipping tool to stretch or shorten the clip until the ghosting disappears. This method effectively eliminates ghosting whenever it occurs, thus resolving the speed difference problem caused by the physical characteristics of robotic arms in complex camera movements.

[0075] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for shooting at different speeds along the same trajectory, characterized in that, The method includes: Determine the speed ratios required for the constant speed layer and variable speed layer during filming; The limited operating speed of the constant-speed layer robotic arm is calculated based on the maximum operating speed of the robotic arm and the speed multiplier. The operating speed limit of the constant speed layer robotic arm and the frame rate of the constant speed layer camera are input into the preset calculation formulas for the operating speed of the variable speed layer robotic arm and the frame rate of the variable speed layer camera to obtain the operating speed of the variable speed layer robotic arm and the frame rate of the variable speed layer camera. The constant speed layer character is filmed according to the constant speed layer robotic arm's running speed and the constant speed layer camera frame rate to obtain constant speed layer filming material, and the variable speed layer character is filmed according to the variable speed layer robotic arm's running speed and the variable speed layer camera frame rate to obtain variable speed layer filming material. The formula for calculating the operating speed of the variable speed layer robotic arm is as follows: Hs=Ls×X In the formula, Ls represents the operating speed of the constant-speed layer robotic arm, and X represents the speed multiplier; The formula for calculating the frame rate of the variable speed layer camera is as follows: Hf = Bf × X In the formula, Bf represents the frame rate of the constant speed layer camera, and X represents the speed multiplier; The maximum speed of the high-speed shooting footage is the maximum speed of the robotic arm. The maximum speed that the robotic arm cannot exceed when shooting at the constant speed layer is determined by the speed magnification X. This is the limit speed of the robotic arm at the constant speed layer. If the limit speed of the robotic arm at the constant speed layer is not known, the effect cannot be achieved when shooting at the variable speed layer. The performance of the characters in the variable speed layer is filmed according to the parameters set in the formula for calculating the frame rate of the variable speed layer camera. The length of the footage is exactly the same as the length of the footage when filming the characters in the normal speed layer, which facilitates post-production compositing.

2. The method for shooting at different speeds along the same trajectory according to claim 1, characterized in that, The speed ratios of the constant speed layer and the variable speed layer are integer multiples.

3. The method for shooting at different speeds along the same trajectory according to claim 1, characterized in that, After determining the speed ratios of the constant-speed and variable-speed layers required for filming, the process also includes: The robot arm's trajectory is determined based on the character's movement in the constant speed or variable speed layer. The assumed ideal speed of the constant-speed layer robot arm is determined based on the robot arm's running trajectory.

4. The method for shooting at different speeds along the same trajectory according to claim 1, characterized in that, The method further includes: A calculation formula is created to establish the relationship between the operating speed of the variable-speed layer robotic arm and the operating speed of the constant-speed layer robotic arm, and the speed ratio. Create a calculation formula between the frame rate of the variable speed layer camera and the frame rate of the constant speed layer camera and the speed multiplier.

5. The method for shooting at different speeds along the same trajectory according to claim 1, characterized in that, The process of filming a character at a constant speed layer based on the operating speed of the robotic arm at the constant speed layer and the frame rate of the camera at the constant speed layer to obtain constant speed layer footage, and filming a character at a variable speed layer based on the operating speed of the robotic arm at the variable speed layer and the frame rate of the camera at the variable speed layer to obtain variable speed layer footage, further includes: The footage shot at the constant speed layer and the footage shot at the variable speed layer are combined using post-production compositing software.

6. The method for shooting at different speeds along the same trajectory according to claim 5, characterized in that, The step of compositing the constant-speed layer footage and the variable-speed layer footage using post-production compositing software includes: If the shooting method is green screen shooting, then the constant speed layer shooting material and the variable speed layer shooting material are composited using keying. If the shooting method is live-action shooting, then the ROTO method is used to synthesize the footage from the constant speed layer and the footage from the variable speed layer.

7. The method for shooting at different speeds along the same trajectory according to claim 6, characterized in that, The step of compositing the constant-speed layer footage and the variable-speed layer footage using post-production compositing software includes: If the shooting method is live-action shooting, but the movement of the characters in the normal speed layer and the variable speed layer do not overlap, then a masking method is used to composite the shooting materials of the normal speed layer and the shooting materials of the variable speed layer.

8. The method for shooting at different speeds along the same trajectory according to claim 5, characterized in that, The process of combining the constant-speed layer footage and the variable-speed layer footage using post-production compositing software further includes: If ghosting occurs when combining the footage from the constant speed layer and the footage from the variable speed layer, the problem is addressed by dragging the speed across different segments.

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