Motion edit method and apparatus for articulated object

Patent metadata

Field	Value
Publication number	US-10467791-B2
Application number	US-201715838494-A
Country	US
Kind code	B2
Filing date	Dec 12, 2017
Priority date	Dec 13, 2016
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

The present disclosure relates to a motion edit method for editing the motion of an articulated object using a computing device with a touch screen, including a) when any one of a joint path and a body line of an articulated object is selected by a user, setting a position constraint of higher level joint according to the user's sketching input and joint hierarchy, and b) generating motion of the articulated object for which the constraint is set.

First claim

What is claimed is:

1. A motion edit method for an articulated object that edits motion of an articulated object using a computing device with a touch screen, comprising:
a) when any one of a joint path and a body line of an articulated object is selected by a user, setting a position constraint of higher level joint according to the user's sketching input and joint hierarchy; and
b) generating motion of the articulated object for which the constraint is set,
wherein at the step a), when setting a position constraint to any one of joints of the articulated object, the following warping vector is applied to prevent the position constrained joint from being visualized statically:
s j warped ( t )= s j ( t )+α w ( t )

where α denotes a user parameter that determines a degree of warping and w(t) denotes the warping vector at the time t,
wherein further comprising:
after the step a),
c) when a change in the joint movement occurs by the sketching input, equalizing a time interval between a keyframe of a point in time at which the user input occurred and other frames before and after the keyframe,
wherein at the step c),
increasing a number of editing frames in proportion to a distance between the articulated object and a camera which captures an image of the articulated object,
wherein T − and T + are respectively defined by a set of editing frames before and after the current time t c , and a set of bounding frames T b in a specific camera view is defined by the following equations:
T + =T − ∪T + ={t c −m, . . . , t c , . . . , t c +n}

T − and T + are defined by the following equation:

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where m and n denote a number of frames before and after the t c respectively, and
s (t)∈ 3 is a motion centroid of the articulated object at the time t c , and f(x) corresponds to a function which computes a number of bounding frames proportional to depth of position x and l(t) denotes a distance between two consecutive centroids in the screen area and 3 denotes 3-dimensional space.

2. The motion edit method for an articulated object according to claim 1 , wherein

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Noh Junyong
• Choi Byungkuk
• Blanco I Ribera Roger
• Hong Seokpyo
• Eom Haegwang
• Jung Sunjin
• Lewis J P
• Seol Yeongho

Classifications

• G06T19/20 Primary

  Editing of three-dimensional [3D] images, e.g. changing shapes or colours, aligning objects or positioning parts · CPC title

• G06T13/20 Primary

  Three-dimensional [3D] animation · CPC title

• G06T2213/12

  Rule based animation · CPC title

• G06T13/40 Primary

  of characters, e.g. humans, animals or virtual beings · CPC title

• G06F3/04847

  Interaction techniques to control parameter settings, e.g. interaction with sliders or dials · CPC title