JP6526775B1 - Animation data compression program, animation data recovery program, animation data compression device, and animation data compression method - Google Patents

Abstract

An animation data compression method capable of reducing data volume is provided. An initial key frame giving initial values of various parameters including pose values and velocity values of each bone in animation data to be compressed is created, and rotation is performed on each bone in a target frame of animation data to be compressed by rotation. It is determined whether or not a bone capable of expressing motion has changed a velocity value by a predetermined value or more compared to the immediately preceding key frame, and when it is determined that the velocity value has changed by a predetermined value or more, By setting at least a velocity value as a key frame in which various parameters related to bones are recorded, and it is determined that the velocity values have not changed by a predetermined value or more, deleting values of various parameters related to the relevant bones in the frame. Compress animation data. [Selected figure] Figure 2

Description

  At least one of the embodiments of the present invention relates to an animation data compression program, an animation data decompression program, an animation data compression apparatus, and an animation data compression method for further reducing the data volume of animation represented in virtual space.

  Conventionally, with regard to animation to be displayed on a virtual space in a video game, animation data has been compressed and held in advance, and compressed animation data has been restored and used at display timing. Modern video game engines feature animation compression built using an algorithm that provides fast runtime decompression. In order to reduce the data volume, an algorithm for animation compression with a higher compression ratio is required.

  As a conventional compression method, for example, there is a method of setting a key frame based on a predetermined condition out of all frames constituting an animation and compressing animation data as a series of key frames existing intermittently. . Each key frame consists of quantized data values for some basic poses that are paired with the quantized time values corresponding to the animation poses at the frame represented by the key data. For example, there are various types of data values, such as n-dimensional rotation, n-dimensional transform, n-dimensional transform scale values, n-dimensional blend shape weights, and the like. Using two keys (data / time pair), for each channel of data, using Tp, the closest closest key before Td, and Tn, the next closest key after Td, Computing the decompressed pose of the desired frame Td is used to perform weighted interpolation of the two key data values with weights W = (Td−Tp) / (Tn−Tp). The desired data values are calculated as Dd = (1.0-W) * Dp + W * Dn.

  As a method of compressing animation data, for example, Patent Document 1 can be mentioned. In this patent document 1, each object information in the read key frame information is compared with corresponding object information in the key frame information having a predetermined relationship with the read key frame information, By adopting a method of outputting compressed key frame information including object information including only information and state information having differences to a medium, for example, animation in which new items appear in order , Eliminating the need to record or transmit the previously appeared object many times.

Japanese Patent Application Laid-Open No. 10-275245

  In the conventional compression method, when complementing a frame between two key frames, a data value of the complemented frame is calculated using a weight based on time information included in the key frame. That is, it was necessary to include time information in the key frame. This conventional compression method is an effective compression method for data reduction, and is currently applied to various animations. On the other hand, under certain conditions, if it is possible to reduce this time information, it is possible to realize further data reduction, but such a compression method has not been proposed.

  An object of at least one embodiment of the present invention is to provide an animation data compression program, an animation data decompression program, an animation data compression apparatus, and an animation data compression method capable of solving the above problems and reducing data volume. .

  According to a non-limiting aspect, an animation data compression program according to an embodiment of the present invention is animation data to be displayed on a virtual space, and expresses bone movement by rotational movement around a predetermined fulcrum An animation data compression program for causing a computer to realize a function of compressing animation data including possible portions, wherein pose values for expressing the pose state of each bone in the animation data to be compressed on the computer, An initial value setting function that creates the first key frame that gives initial values of various parameters including rotational speed values when bones rotate, and motions are expressed by rotation for each bone in the target frame of the animation data to be compressed Possible bones are the last key The speed change determining function of determining whether the speed value has changed by a predetermined value or more as compared with the frame, and the speed change determining function when it is determined that the speed value has changed by a predetermined value or more. A key frame setting function that sets at least a velocity value for various parameters related to bones, and the velocity change determination function determines that the velocity value has not changed by a predetermined value or more, the bone in the frame in question To realize a deletion function of deleting values of various parameters relating to.

  According to a non-limiting aspect, an animation data restoration program according to an embodiment of the present invention is an animation data restoration program for causing a computer to realize a function of restoring animation data compressed by the animation data compression program. The key frame discrimination function of determining whether or not there is a key frame directly corresponding to the frame to be restored to the computer, and the key frame directly corresponding to the frame to be restored, A key frame output function that generates animation data of the frame using various parameter values for each bone given by the key frame, and a key frame immediately before when there is no key frame directly corresponding to the frame to be restored. Therefore various parameter values for each bone given, based on the elapsed time from the speed value and the previous key frame, characterized in that to realize a frame completion of generating the animation data of the frame.

  According to a non-limiting aspect, an animation data compression apparatus according to an embodiment of the present invention is animation data to be displayed on a virtual space, and expresses bone movement by rotational movement around a predetermined fulcrum. An animation data compression apparatus for compressing animation data including possible portions, which is a pose value for expressing the pose state of each bone in the animation data to be compressed, and a rotation speed value when each bone is rotated For each bone in the target frame of the animation data to be compressed, a bone that can represent motion by rotation is used as an immediately preceding key frame for the bones in the target frame of the animation data to be compressed. Speed to compare and determine whether the speed value has changed by more than a predetermined value And a key frame setting unit configured to set at least a velocity value for various parameters related to the bone in the frame when it is determined in the velocity change determination unit that the velocity value has changed by a predetermined value or more And a deletion unit for deleting values of various parameters related to the bone in the frame when it is determined that the speed value has not changed by the predetermined value or more in the speed change determination unit.

  According to a non-limiting aspect, an animation data compression method according to an embodiment of the present invention is animation data to be displayed on a virtual space, and expresses bone motion by rotational motion around a predetermined fulcrum An animation data compression method for compressing animation data including possible portions, which is a pose value for expressing the pose state of each bone in the animation data to be compressed, and a rotation speed value when each bone is rotated For each bone in the target frame of the animation data to be compressed, a bone that can represent motion by rotation is used as an immediately preceding key frame for the initial value setting processing of creating the first key frame giving initial values of various parameters including Speed to compare and compare whether the speed value has changed by more than a predetermined value A key frame setting process for setting at least a velocity value for various parameters related to the bone in the frame when it is determined that the velocity value has changed by a predetermined value or more in the change determination process and the velocity change determination process. And a deletion process of deleting values of various parameters related to the bone in the frame when it is determined that the speed value has not changed by the predetermined value or more in the speed change determination process.

  Each embodiment of the present application solves one or more deficiencies.

It is a block diagram showing an example of composition of an animation data compression device corresponding to at least one of an embodiment of the present invention. It is a flowchart which shows the example of the compression process of animation data corresponding to at least one of embodiment of this invention. It is an explanatory view for explaining the concept of compression processing of animation data corresponding to at least one of the embodiments of the present invention. It is a block diagram showing an example of composition of an animation data decompression device corresponding to at least one of an embodiment of the present invention. It is a flowchart which shows the example of the decompression | restoration process of animation data corresponding to at least one of embodiment of this invention. It is an explanatory view for explaining frame composition of animation data after performing compression processing of animation data corresponding to at least one of the embodiments of the present invention. It is an explanatory view showing an example of animation which is a compression object of an animation data compression device corresponding to at least one of the embodiments of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the various components in the example of each embodiment described below can be combined suitably in the range which a contradiction etc. do not produce. Moreover, about the content demonstrated as an example of a certain embodiment, the description may be abbreviate | omitted in other embodiment. In addition, the contents of operations and processes that are not related to the characterizing portion of each embodiment may be omitted. Furthermore, the order of the various processes constituting the various flows described below is random as long as no contradiction or the like occurs in the process contents.

First Embodiment
Hereinafter, an animation data compression apparatus 10 according to an embodiment of the present invention will be described. FIG. 1 is a block diagram showing an example of the configuration of an animation data compression apparatus 10 according to an embodiment of the present invention. As shown in FIG. 1, the animation data compression device 10 includes an animation data acquisition unit 11, an initial value setting unit 12, a speed change determination unit 13, a key frame setting unit 14, a deletion unit 15, and compressed data. And at least an output unit 16.

  The animation data handled by the animation data compression apparatus 10 according to the present embodiment is an object composed of a skeleton (hereinafter referred to as a bone) and a joint portion joining the skeletons, and rotation of the bone centering on the joint portion. An effective compression method is adopted for an object whose motion can be described by its rotation speed. Specifically, for example, a human-shaped character shown in FIG. 7 or the like corresponds. The character shown in FIG. 7 is configured by combining bones with the main joint portion as a joint portion, and each bone can represent an action by rotational movement centering on the joint portion serving as a fulcrum. Become. The animation data of such a character has, in the state before compression, a pose value which is a parameter representing the posture state (pose state) of the character in each frame, and is configured to have a pose value for each bone. Yes. That is, for each frame, information necessary to render an animation on a virtual space, for example, a game screen, is held. Note that the animation data before compression does not necessarily have to be represented by the rotational motion velocity value.

  The animation data acquisition unit 11 has a function of acquiring animation data to be compressed.

  The initial value setting unit 12 is a first key frame giving initial values of various parameters including a pose value for expressing the pose state of each bone in the animation data to be compressed, and a rotation speed value when each bone rotates. Have the ability to create Since it is necessary to set initial values for all bones constituting the animation, it can be said that the first key frame contains initial values for all bones appearing in the first frame. In addition, although the velocity value for each bone is used as it is if the velocity value is given in advance in the animation data to be compressed, if it does not have the velocity value, the nearby frame (for example, 1) The velocity value of the bone is calculated based on the amount of movement of the bone in space and the elapsed time (the number of elapsed frames) when compared with the bone in the next frame), and is set as an initial value. Also, the first key frame may be in any form as long as it can provide a necessary initial value, for example, a form for giving an initial value such as an initial pause key may be used, or for each bone An initial value may be given by a provided pause key (bone key). Also, if there is a bone appearing from the middle of the animation, the appearing frame is the first frame for that bone.

  Here, the velocity value for the bone is a parameter necessary to calculate the amount of movement of the bone per frame. The method of giving the velocity value may be any method as long as the movement amount of the bone can be calculated. For example, a method of giving each velocity component of x, y, z in a three-dimensional space can be considered. Also, the velocity value is a parameter given to each bone. For example, even if the bone corresponding to the upper arm of an object imitating a person rotates while changing the velocity value, if the bone corresponding to the forearm is stationary, the velocity value of the bone of the forearm is 0. It turns out that.

  For each bone in the target frame of the animation data to be compressed, the speed change determination unit 13 determines whether the speed value has changed by a predetermined value or more as compared to the key frame immediately before, for each bone in the target frame of the animation data to be compressed. Has a function to determine. The unit of determination is for each bone, and each bone is compared with the previous key frame to determine the speed change. Although the predetermined value regarding the velocity value may be any value, the magnitude of the predetermined value and the data reduction rate tend to be proportional to each other, and the magnitude of the predetermined value and the data reproduction accuracy at the time of restoration are inversely proportional to each other. Tend to be It should be noted that the velocity value to be determined is used as it is when animation data to be compressed is given in advance, but if it does not have a velocity value, nearby frames (eg, The determination is made after calculating the velocity value of the bone according to the movement amount of the bone in space and the elapsed time (the number of elapsed frames) when compared with the bone in the immediately preceding frame).

  The key frame setting unit 14 sets a function to set at least a velocity value as a key frame for various parameters related to the bone in the frame when the velocity change determination unit 13 determines that the velocity value has changed by a predetermined value or more. Have. It is set for each bone as a key frame, and some bones are set as key frames in the same frame, and some bones are deleted. The key frame is provided with bone keys for setting parameters including the velocity value of the bone as many as the number of bones set in the key frame, but other than this, the key frame itself corresponds to what number frame in the original animation data Also set the information of the.

  The deletion unit 15 has a function of deleting values of various parameters related to the bone in the frame when it is determined in the speed change determination unit 13 that the speed value has not changed by a predetermined value or more. The unit for deleting data is per bone.

  The compressed data output unit 16 performs determination processing by the speed change determination unit 13 on all bones of all frames of animation data to be compressed, and the data set as a key frame by the key frame setting unit 14 Is finally output as compressed data. Note that when the processing is completed up to the last frame of the target animation data, the quantized values of all key frames in the entire animation clip are determined, and the compressed data output unit 16 may, if necessary, carry out these keys. Based on the information in the frame, write out all the values sequentially so that they occur chronologically during playback of the animation clip, whether or not which bone's data channel has a new speed value for each key frame Final by adding a small amount of metadata to indicate, or by adding range data associated with each key used to dequantize the key frame within the limited range of possible values. Get compressed data.

  FIG. 2 is a flowchart showing an example of the compression process performed by the animation data compression device 10. Note that the processing according to the flowchart shown in FIG. 2 is performed for each bone constituting animation data, and in practice the processing is performed for all the bones of one frame and then the process proceeds to the next frame. However, for convenience of explanation, the description will be made in the case of focusing on one bone.

  In FIG. 2, first, animation data to be compressed is acquired (step S101). A first key frame for giving an initial value is set from the acquired animation data (step S102). The process moves to the next frame, and it is determined whether the velocity value given in the frame has changed by a predetermined value or more compared to the immediately preceding key frame (step S103). If the velocity value changes by a predetermined value or more (S103-Y), a key frame including the velocity value given in the frame is set (step S104). If the velocity value has not changed by the predetermined value or more (S103-N), the values of various parameters of the frame are deleted (step S105). When the processing of the target frame is completed, it is determined whether the frame is the last frame (step S106). If it is not the last frame (S106-N), the processing object is shifted to the next frame (step S107), and the processing of steps S103 to S105 is performed. The above-described processing of steps S103 to S105 is repeated while sequentially shifting the frames, and at the stage where the processing for the last frame is finished (S106-Y), the data set in the key frame up to that point is compressed data And the compression process is terminated (step S108).

  FIG. 3 is an explanatory diagram for explaining the concept of compression processing of animation data. In FIG. 3, the vertical axis represents the rotation angle of the bone on the vertical axis, and the elapsed time is on the horizontal axis. Keyframe setting locations and deletion targets in the case where compression processing is performed on such a bone where the rotation angle changes Indicates the frame position at which The first frame of the animation data to be compressed needs to be set as a key frame, but for the subsequent frames, pay attention to the change in velocity value, and if the amount of change in velocity value is less than a predetermined value, that frame The data on the bone in question are deleted. Also in FIG. 3, assuming that the frame set as the first key frame is the first one, for the second to fifth frames, it is determined that the amount of change in velocity value is less than or equal to the predetermined value. It is assumed. For the sixth frame, the amount of change in velocity value is equal to or greater than a predetermined value, and thus, is set as a key frame. The same process is performed on the entire animation to determine a frame to be set as a key frame and a frame to be deleted. The curve of the solid line in FIG. 3 is the change of the rotation angle according to the original animation data, and the locus shown by the broken line represents the change of the rotation angle according to the restored animation data.

  Next, an animation data restoration apparatus 20 according to an embodiment of the present invention will be described. FIG. 4 is a block diagram showing an example of the configuration of the animation data restoration device 20 according to an embodiment of the present invention. As shown in FIG. 4, the animation data restoration device 20 includes a compressed data acquisition unit 21, a key frame determination unit 22, a key frame output unit 13, a frame completion unit 24, and a restoration animation data output unit 25. At least equipped.

  The compressed data acquisition unit 21 has a function of acquiring compressed data to be subjected to the restoration process.

  The key frame determination unit 22 has a function of determining whether or not there is a key frame directly corresponding to the frame to be restored. Since the key frame included in the compressed data contains information indicating which frame it should restore, it is determined whether or not there is a key frame corresponding to the frame to be restored. be able to.

  The key frame output unit 13 has a function of generating animation data of the frame using various parameter values for each bone given by the key frame, when there is a key frame directly corresponding to the frame to be restored. .

  If there is no key frame directly corresponding to the frame to be restored, the frame complementing unit 24 is based on various parameter values for each bone given by the immediately preceding key frame, the velocity value, and the elapsed time from the immediately preceding key frame. And has a function of generating animation data of the frame. Since the pose state where the bone should be located in the frame to be restored is determined by using the bone pose value and the bone velocity value given by the bone key of the previous key frame, the frame to be operated on by these operations Find the pose value of the bone in and complement the information of the bone in the frame.

  The restoration animation data output unit 25 has a function of outputting animation data obtained by the restoration process. It may be output sequentially from the restored frame, or may be output after recovery to the final frame.

  FIG. 5 is a flowchart showing an example of the restoration processing performed by the animation data restoration device 20. Note that the processing according to the flowchart shown in FIG. 5 is performed for each bone constituting animation data, and in practice the processing is performed for all the bones of one frame, and then the process proceeds to the next frame. However, for convenience of explanation, the description will be made in the case of focusing on one bone.

  In FIG. 5, first, compressed data to be restored is acquired (step S201). The animation data is sequentially restored from the top frame, and at that time, it is determined whether or not a key frame directly corresponding to the frame to be restored exists in the compressed data (step S202). When there is a key frame directly corresponding to the frame to be restored (S202-Y), animation data of the frame is generated using various parameter values for each bone given by the key frame (S203). If there is no key frame directly corresponding to the frame to be restored (S 202 -N), based on the various parameter values for each bone given by the immediately preceding key frame, the velocity value, and the elapsed time from the immediately preceding key frame. , Generate animation data of the frame (S204). When the processing of the target frame is completed, it is determined whether the frame is the last frame (step S205). If it is not the last frame (S205-N), the processing object is shifted to the next frame (step S206), and the processing of steps S202 to S204 is performed. The above steps S202 to S204 are repeated while sequentially shifting the frames, and at the stage where the processing for the last frame is finished (S205-Y), the data of all the frames restored so far is restored to animation data And the compression processing is ended (step S207). Although FIG. 5 is described as a flow in which data of all frames are restored and then output, the restored frames may be sequentially output.

  FIG. 6 is an explanatory diagram for explaining a frame configuration of animation data after compression processing. FIG. 6 (a) shows data after compression by the conventional compression method using a weight based on time information included in a key frame, and FIG. 6 (b) shows a compression method according to the present example using a velocity value. Data after compression by. FIGS. 6 (a) and 6 (b) are data taking an example of the case where only three bones of bone 0, bone 1 and bone 2 are used. In the conventional data after compression shown in FIG. 6A, frames of time keys equal in number to the bones included in the key frame are provided for each key frame. Calculation of weight is performed using this time key. On the other hand, in the compressed data of this example shown in FIG. 6 (b), although the speed value is set by the bone key for each key frame, since the time key is not necessary, the frame for the time key Only the data capacity can be reduced. In the example shown in FIGS. 6 (a) and 6 (b), an initial pause key for giving an initial value of each bone and what data range each channel key is handled (number of digits of numerical data etc.) It has a channel of the data range shown. Also, a channel having label information for indicating which bone the bone key is included in in the key frame is set for each key frame. The label information indicates, for example, whether or not the bone key is included by “1” “0”, and if all bone keys are included for the three bones of bone 0, bone 1 and bone 2, “111” If the bone 1 is not included and the bone 1 and the bone 2 are included, it is represented as "011". This label information is used, for example, to know to which velocity value the time information on the key frame is associated.

  As described above, as one aspect of the first embodiment, it is animation data to be displayed on a virtual space, and includes a portion capable of expressing the movement of a bone by rotational movement about a predetermined fulcrum. An animation data compression apparatus for compressing animation data includes an animation data acquisition unit 11, an initial value setting unit 12, a speed change determination unit 13, a key frame setting unit 14, a deletion unit 15, and output of compressed data A first key frame giving initial values of various parameters including a pose value for expressing the pose state of each bone in the animation data to be compressed, a speed value of rotation when each bone rotates, and a section 16 Create and move by rotation for each bone in the target frame of animation data to be compressed It is determined whether the speed value has changed by a predetermined value or more as compared to the key frame that can be represented, and when it is determined that the speed value has changed by a predetermined value or more, the bone related to the frame in the frame Since various parameters are set as key frames recording at least velocity values, and it is determined that the velocity values have not changed by a predetermined value or more, the values of various parameters relating to the bone in the frame are deleted. It becomes possible to perform compression processing of animation data which can reduce data volume.

  That is, by adopting the velocity value as bone information to be recorded in the key frame, complementary data can be generated without using the time information of the previous and subsequent key frames, so the data capacity is reduced by the time key frame. It is possible to In addition, when the bone performs rotational motion at constant velocity, it is not necessary to provide the bone key of the bone until the amount of change in velocity reaches a predetermined value or more next time. Therefore, it is possible to reduce the total data capacity by thinning many frames and reducing the number of key frames.

Second Embodiment
The first embodiment has been described on the assumption that the velocity value is recorded for the bone when setting a key frame in the compression processing. On the other hand, in the second embodiment, the difference between the velocity values may be recorded instead of the velocity value.

  At the time of compression processing, it is necessary to record the velocity value for the first key frame, but in the subsequent frames to be processed, the amount of change in velocity value becomes equal to or more than the predetermined value when compared with the immediately preceding key frame. When setting a frame as a key frame, the velocity value is not recorded, but the difference between the velocity values when compared with the immediately preceding key frame is recorded.

  At the time of restoration processing, the velocity value of the key frame immediately before the frame to be processed can be calculated by using the velocity value set in the first key frame and the difference between the velocity values set in the subsequent key frames. . The complementing process of the frame after the velocity value of the immediately preceding key frame can be calculated is the same as that of the first embodiment. Note that, in reality, if the speed value of the immediately preceding key frame is held in the memory in order to facilitate the calculation when calculating the speed value of the target key frame, the target key frame Every time the velocity value is calculated, it is not necessary to recalculate all from the beginning based on the velocity value set in the first key frame and the difference between the velocity values set in the subsequent key frames.

  When recording the difference between the velocity values instead of the velocity values, the data values of each bone key are normalized to a distribution close to zero as compared with the case of recording the velocity values, and generally, a relatively narrow range of possible values Fit in With conventional animation compression techniques, it is also possible to define a narrow range to quantize each key as well, but when dealing with data from many different channels, define more different range data It is necessary to use. This is mainly because the center of each range is an arbitrary non-zero value. However, with this new method, all ranges are concentrated to near zero ranges, thus eliminating the need for a very large number of different range data definitions to be present in the data stream, resulting in a smaller amount of data in total It is possible to However, although it is likely to be in the range close to zero, a small subset of keys may have values that are not within the range defined by the typical range data used for most keys. Thus, means for using larger bit-width range data are required for keys in this subset as well. Multiple range sizes are provided, and keys are encoded using the range that is most tightly bound to their value, and metadata indicating which of the predefined ranges should be used when decompressing each key This problem can be solved by recording the range data as. Most bone keys have a narrow data range, so recording speed differences requires fewer bits for recording. Therefore, it is possible to reduce the data capacity as a whole.

Third Embodiment
The first and second embodiments have been described as setting the velocity value of the bone or the difference between the velocity values in the key frame. In the first and second embodiments, the velocity value or the difference between the velocity values is described as being given by, for example, the x, y, and z velocity components in the three-dimensional space, but in the third embodiment In the velocity value or the difference of the velocity value, the velocity value or the velocity value difference is set by the rotational velocity axis data and the rotational velocity amplitude data.

  For animation that expresses stable rotation around an axis, such as mechanical gears or wheels of a vehicle, it is better to represent bone rotational motion with rotational speed axis data and rotational speed amplitude data as data capacity May lead to a reduction in For example, in the case of stable axis rotation, if the position of the axis is given by the rotational speed axis data in one key frame, the rotational speed will also be in subsequent key frames as long as the position of the axis does not change. It is possible to omit axis data. Then, the rotational speed amplitude data is updated in the key frame when the change in the rotational speed when rotating around the axis reaches a predetermined value or more.

  If a method is adopted in which the rotational speed that rotates around the axis is given as a scalar value as rotational speed amplitude data, the number of times the rotational speed axis data is updated in the key frame decreases if it is a stable rotation around the axis. Since it is only necessary to update the rotational speed amplitude data in the key frame, it is possible to reduce the data capacity.

  As explained above, each embodiment of the present application solves one or more deficiencies. In addition, the effect by each embodiment is an example of a non-limiting effect or an effect.

  In each of the above-described embodiments, the animation data compression apparatus 10 and the animation data restoration apparatus 20 execute various control programs (for example, an animation data compression program, an animation data restoration program) stored in a storage device provided therein. The various processes described above may be executed.

  According to one embodiment of the present invention, it is useful for compression processing of animation data on an object whose rotational motion can be described by its rotational speed.

DESCRIPTION OF SYMBOLS 10 animation data compression apparatus 11 animation data acquisition part 12 initial value setting part 13 speed change discrimination | determination part 14 key frame setting part 15 deletion part 16 compressed data output part 20 animation data decompression | restoration apparatus 21 compressed data acquisition part 22 key frame discrimination | determination part 23 key frame output unit 24 frame complement unit 25 restored animation data output unit

Claims (6)

An animation data compression program for causing a computer to realize a function of compressing animation data including a portion capable of expressing a bone motion by a rotational movement about a predetermined fulcrum, which is animation data to be displayed on a virtual space And
On the computer
An initial value setting function that creates an initial key frame giving initial values of various parameters including a pose value for expressing the pose state of each bone in animation data to be compressed, and a speed value of rotation when each bone rotates When,
And a speed change determination function that determines whether the speed value has changed by a predetermined value or more as compared with the immediately preceding key frame, for each bone in the target frame of the animation data to be compressed, as compared with the immediately preceding key frame. ,
A key frame setting function of setting at least a velocity value as a key frame for recording various parameters related to the bone in the frame when it is determined that the velocity value has changed by a predetermined value or more in the velocity change determination function;
An animation data compression program that realizes a deletion function of deleting values of various parameters related to the bone in the frame when it is determined in the speed change determination function that the speed value has not changed by a predetermined value or more. The animation data compression program according to claim 1, wherein the key frame setting function sets, as a key frame recorded at least, a value of a difference in speed when compared with the immediately preceding key frame, instead of the speed value. An animation data restoration program for causing a computer to realize a function of restoring animation data compressed by the animation data compression program according to claim 1.
On the computer
A key frame determination function of determining whether or not there is a key frame directly corresponding to the frame to be restored;
A key frame output function of generating animation data of the frame using various parameter values for each bone given by the key frame, when there is a key frame directly corresponding to the frame to be restored;
If there is no key frame directly corresponding to the frame to be restored, animation of the frame is performed based on the various parameter values for each bone given by the previous key frame, the velocity value, and the elapsed time from the previous key frame. An animation data restoration program that realizes a frame interpolation function that generates data. An animation data restoration program for causing a computer to realize a function of restoring animation data compressed by the animation data compression program according to claim 2.
On the computer
A key frame determination function of determining whether or not there is a key frame directly corresponding to the frame to be restored;
A key frame output function of generating animation data of the frame using various parameter values for each bone given by the key frame, when there is a key frame directly corresponding to the frame to be restored;
If there is no keyframe directly corresponding to the frame to be restored, various parameter values for each bone given by the first keyframe, velocity values, keyframes existing between the first keyframe and the current frame An animation data restoration program for realizing a frame complementing function of generating animation data of the frame based on the difference between the velocity values given by and the elapsed time from the first key frame. An animation data compression apparatus for compressing animation data that is animation data to be displayed on a virtual space, the animation data including a portion capable of expressing the movement of a bone by rotational movement about a predetermined fulcrum,
An initial value setting unit that creates an initial key frame giving initial values of various parameters including a pose value for expressing the pose state of each bone in the animation data to be compressed, and a speed value of rotation when each bone rotates When,
A velocity change determination unit that determines whether the velocity value has changed by a predetermined value or more as compared with the immediately preceding key frame for each bone in the target frame of the animation data to be compressed, as compared with the immediately preceding key frame; ,
A key frame setting unit configured to set at least a velocity value as a key frame in which various parameters related to the bone in the frame are determined when the velocity change determining unit determines that the velocity value has changed by a predetermined value or more;
An animation data compression apparatus comprising: a deletion unit that deletes values of various parameters related to the bone in the frame when it is determined in the speed change determination unit that the velocity value has not changed by a predetermined value or more. An animation data compression method for compressing animation data, which is animation data to be displayed on a virtual space and includes a portion capable of expressing the movement of a bone by a rotational movement about a predetermined fulcrum,
Initial value setting processing for creating the first key frame giving initial values of various parameters including the pose value for expressing the pose state of each bone in the animation data to be compressed, and the speed value of rotation when each bone rotates When,
Speed change determination processing for determining whether or not a bone capable of expressing movement by rotation has changed a speed value by a predetermined value or more as compared with the immediately preceding key frame for each bone in a target frame of animation data to be compressed; ,
A key frame setting process of setting at least a velocity value as a key frame recording various parameters related to the bone in the frame when it is determined that the velocity value has changed by a predetermined value or more in the velocity change determination process;
A deletion process of deleting values of various parameters related to the bone in the frame when it is determined in the speed change determination process that the speed value has not changed by a predetermined value or more.

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