A plurality of artificial feathers for a shuttlecock is disclosed. The artificial feathers connect to a plurality of stems and a base portion to form the shuttlecock. Each of the artificial feathers comprises a connecting portion and a resistance portion. The connecting portion connects to one of the stems. The resistance portion connects to the connecting portion, and the resistance portion comprises a plurality of low-wind-resistance areas and a high-wind-resistance area. The low-wind-resistance areas are surrounded by the high-wind-resistance area.

A plurality of artificial feathers for a shuttlecock is disclosed. The artificial feathers connect to a plurality of stems and a base portion to form the shuttlecock. Each of the artificial feathers comprises a connecting portion and a resistance portion. The connecting portion connects to one of the stems. The resistance portion connects to the connecting portion, and the resistance portion comprises a plurality of low-wind-resistance areas and a high-wind-resistance area. The low-wind-resistance areas are surrounded by the high-wind-resistance area.

A method for automatically recognizing a sport court according to the present invention includes: a step for acquiring an original image of the sport court as captured by a camera; a step for converting the acquired original image and generating a binarized image; a step for detecting lines forming the court from the binarized image; a step for adding virtual extension lines to the detected lines to compensate for missing lines, to thereby generate preliminary court lines; a step for comparing a pre-stored regulation size sport court template and the preliminary court lines; a step for correcting the preliminary court lines according to the comparison result; a step for labeling the corrected court lines; and a step for generating sport court information including labeling information.

A game system having a net and a shuttlecock for playing a game involving hitting the shuttlecock back-and-forth between players located on opposite sides of the net. The net is supported above a ground surface and has an opening formed therethrough to provide passage of the shuttlecock through the net when hit by one or more players located on opposite sides of the net. The shuttlecock has a plurality of flexible feather fins that are specifically configured and arranged to provide airspeed braking of the shuttlecock when in flight to control the speed and the distance that the shuttlecock may be hit.

A game system having a net and a shuttlecock for playing a game involving hitting the shuttlecock back-and-forth between players located on opposite sides of the net. The net is supported above a ground surface and has an opening formed therethrough to provide passage of the shuttlecock through the net when hit by one or more players located on opposite sides of the net. The shuttlecock has a plurality of flexible feather fins that are specifically configured and arranged to provide airspeed braking of the shuttlecock when in flight to control the speed and the distance that the shuttlecock may be hit.

Methods, apparatus and kits for modifying natural feathers that are used in sporting goods that result in long lasting feathers with increased mechanical stability, reliability and durability as well as improved flight consistency are disclosed. Some of the sporting goods that use natural feathers are badminton shuttlecocks, arrow fletchings, and darts. The disclosed methods consist of controlled treatment of feather shuttlecocks with crosslinking agents to crosslink the keratin protein present on the natural feathers of the shuttlecock.

Methods, apparatus and kits for modifying natural feathers that are used in sporting goods that result in long lasting feathers with increased mechanical stability, reliability and durability as well as improved flight consistency are disclosed. Some of the sporting goods that use natural feathers are badminton shuttlecocks, arrow fletchings, and darts. The disclosed methods consist of controlled treatment of feather shuttlecocks with crosslinking agents to crosslink the keratin protein present on the natural feathers of the shuttlecock.

An artificial shuttlecock, a feather and a preparation method thereof are provided. The feather includes a connecting portion, a first portion, a second portion and a concave. The first portion and the second portion are disposed on the opposite sides of the connecting portion. The concave is located at an outer edge of the second portion. The concave is formed by the following steps of: defining an overlapped outline, which is the outline of the adjacent feather overlapping on the second portion; defining a reference point, which is a point where the overlapped outline is closest to the connecting portion; defining a shifting reference line, which passes through the reference point and is parallel to the connecting portion; defining a reference outline, which is located outside the shifting reference line; and cutting the reference outline to form the concave.

An artificial shuttlecock, a feather and a preparation method thereof are provided. The feather includes a connecting portion, a first portion, a second portion and a concave. The first portion and the second portion are disposed on the opposite sides of the connecting portion. The concave is located at an outer edge of the second portion. The concave is formed by the following steps of: defining an overlapped outline, which is the outline of the adjacent feather overlapping on the second portion; defining a reference point, which is a point where the overlapped outline is closest to the connecting portion; defining a shifting reference line, which passes through the reference point and is parallel to the connecting portion; defining a reference outline, which is located outside the shifting reference line; and cutting the reference outline to form the concave.

An artificial shuttlecock, a feather and a preparation method thereof are provided. The feather includes a connecting portion, a first portion, a second portion and a concave. The first portion and the second portion are disposed on the opposite sides of the connecting portion. The concave is located at an outer edge of the second portion. The concave is formed by the following steps of: defining an overlapped outline, which is the outline of the adjacent feather overlapping on the second portion; defining a reference point, which is a point where the overlapped outline is closest to the connecting portion; defining a shifting reference line, which passes through the reference point and is parallel to the connecting portion; defining a reference outline, which is located outside the shifting reference line; and cutting the reference outline to form the concave.