Interaction control system, method for detecting motion of object, host apparatus and control method thereof

A host apparatus, comprising:

• a control module;
• a light source module, projecting a pattern to a detection region, wherein the pattern has a plurality of parallel lines extending toward a predetermining direction;
• an image capturing device, capturing images of the detection region and generating an image information stream based on the images;
• a processor, coupled to the image capturing device for obtaining a subtracted image information by subtracting the currently captured image information to a background image information of the detection region so as to determine whether or not an object appearing in the detection region, when the object appears in the detection region, calculating a motion of the object based on a variation of the pattern imaged on a surface of the object toward the light source module, and generating corresponding control instruction to the control module, so as to control the host apparatus,
• wherein the processor detects variation of line width of the surface of the object according to amount of pixels having the absolute value of the gray scale greater than a predetermined value, and the processor determines that the object is closer to a reference point when the line width of each line imaged on the surface is thicker and determines that the object has a farther distance from the reference point when the line width of each line imaged on the surface is thinner.

A method for controlling a host apparatus, comprising:

• projecting a pattern to a detection region, wherein the pattern has a plurality of parallel lines extending toward a predetermining direction;
• capturing images of the detection region for generating an image information stream to form a background image information of the detection region;
• subtracting the currently captured image information to the background image information for obtaining a subtracted image information, so as to determine whether or not an object appearing in the detection region;
• calculating a motion of the object when the object appears in the detection region based on a variation of the pattern imaged on a surface of the object, comprising:
• detecting variation of line width of one of surfaces of the object according to amount of pixels having the absolute value of the gray scale greater than the predetermined value;
• determining that the object is closer to a reference point when the line width of each line imaged on the surface is thicker;
• and
• determining that the object has a farther distance from the reference point when the line width of each line imaged on the surface is thinner;
• and
• generating corresponding control instruction to the host apparatus so as to control the host apparatus.

A method for detecting a motion of an object, comprising:

• projecting a pattern to a detection region, wherein the pattern has a plurality of parallel lines extending toward a predetermining direction;
• capturing images of the pattern reflected from the detection region and generating an image information stream, wherein the image information stream has a plurality of pixels;
• subtracting the currently captured image information to a background image information for obtaining a subtracted image information;
• detecting a gray scale of each pixel of the subtracted image information to determine whether or not absolute values of gray-scale of each pixel are greater than a predetermined value;
• determining an object appears in the detection region, when detecting at least one of the absolute values of the gray scale of the pixels be greater than the predetermined value;
• determining a movement track of the object according to a movement of the pixel having the absolute value of the gray scale greater than the predetermined value;
• detecting variation of line width of one of surfaces of the object according to amount of pixels having the absolute value of the gray scale greater than the predetermined value;
• determining that the object is closer to a reference point when the line width of each line imaged on the surface is thicker;
• and
• determining that the object has a farther distance from the reference point when the line width of each line imaged on the surface is thinner.