Finger-gesture detection device, control assembly and correction method

A finger-gesture detection device, adapted for a control handle, the control handle including a grip portion, adapted to be gripped by a hand and moved in a three-dimensional space, the grip portion being provided with a plurality of sensors, and the finger-gesture detection device comprising:

• a first wearing portion, adapted to detachably surround the grip portion of the control handle, when the grip portion is connected to the first wearing portion, the grip portion being positioned on a side of the first wearing portion;
• a plurality of second wearing portions, each being independently connected to the first wearing portion, when a force is applied to one of the second wearing portions, the corresponding second wearing portion moving toward the grip portion;
• and
• a plurality of sensing components, respectively disposed on the second wearing portions, a plurality of sensors corresponding to the sensing components detecting positions or movements of the second wearing portions relative to the grip portion.

A control assembly, applied to virtual reality, the control assembly comprising:

• a control handle, including a grip portion, adapted to be gripped by a hand and moved in a three-dimensional space;
• and
• a finger-gesture detection device, including:
• a first wearing portion, adapted to detachably surround the grip portion of the control handle, when the grip portion is connected to the first wearing portion, the grip portion being positioned on a side of the first wearing portion;
• a plurality of second wearing portions, each being independently connected to the first wearing portion, when a force is applied to one of the second wearing portions, the corresponding second wearing portion moving toward the grip portion;
• and
• a plurality of first sensors, respectively disposed on the second wearing portions for detecting positions or movements of the second wearing portions relative to the grip portion.

A correction method, adapted for a virtual reality system, the virtual reality system mapping a real hand gesture of a user to a virtual hand gesture, the virtual hand gesture including a plurality of virtual finger gestures and a virtual palm gesture, the virtual reality system including a control handle for being gripped by a hand of the user, a finger-gesture detection device detachably surrounding the control handle and worn on the hand, and a computer, the finger-gesture detection device including a plurality of first sensors and a second sensor, the first sensors being respectively located on a plurality of fingers of the hand, the second sensor being located on a palm of the hand, each of the first sensors including an inertial measurement unit (IMU) and a component sensing unit, the second sensor comprising an inertial measurement unit and a component sensing unit, and the correction method comprising:

• multiplying, by the computer, a real-time detection result of each of the first sensors by a first rotation matrix and a second rotation matrix to calculate each of the virtual finger gestures, the first rotation matrix being a transformation matrix between a coordinate system of each of the first sensors and a coordinate system of the second sensor, and the second rotation matrix being a transformation matrix between the coordinate system of the second sensor and a coordinate system of the control handle;
• and
• directly using, a real-time detection result of the control handle as the virtual palm gesture by the computer.

A correction method, adapted for a virtual reality system, the virtual reality system including a control handle for being gripped by a hand of a user, a finger-gesture detection device detachably connecting the control handle and worn on the hand, and a computer, and the correction method comprising:

• calculating, by the computer, an actual bending range of a finger of the hand of the user relative to a palm of the hand according to an initial detection result of the finger-gesture detection device, the actual bending range containing an upper bound and a lower bound;
• updating the upper bound of the actual bending range with an excessive bending degree, when a bending degree of the finger calculated according to a real-time detection result of the finger-gesture detection device exceeds the upper bound of the actual bending range;
• and
• updating the lower bound of the actual bending range with an excessive bending degree, when a bending degree of the finger calculated according to a real-time detection result of the finger-gesture detection device exceeds the lower bound of the actual bending range.