Control method for light sources of vision machine, and vision machine

A control method for light sources of a vision machine, wherein the control method comprises:

• activating at least one first light source among n light sources and sensing spatial information of an object in a field of view;
• and
• selectively activating the n light sources according to the spatial information of a sensed object;
• wherein the n light sources are distributed on a periphery of a front mirror surface of a lens of the vision machine, and n is a natural number greater than or equal to 2,
• wherein selectively activating the n light sources according to the spatial information of the sensed object comprises:
• selectively activating one of the light sources among the n light sources, whose field of view corresponds to a space of the sensed object, according to a position and a height of the sensed object, which comprises:
• determining whether the height of the sensed object is lower than an optical axis of the lens when the sensed object is within a sensitive distance of the vision machine, and if the height of the sensed object is lower than the optical axis of the lens, activating at least one second light source among the n light sources to illuminate an upper surface of the sensed object, wherein the sensitive distance is a maximum perpendicular distance from an object required to be sensed to a bearing surface, and the bearing surface is a plane where the front mirror surface of the lens is located,
• wherein the periphery is a circumference having a first radius, and taking a center of the front mirror surface as a circle center, and the first radius is at least larger than a radius of the front mirror surface,
• wherein the n light sources are evenly distributed on the circumference, and a polygon formed by the n light sources takes a vertical straight line passing through the center of the front mirror surface as a symmetry axis, wherein n is a natural number greater than or equal to 3;
• wherein the method further comprises determining illumination angles of the n light sources and a distance between each light source and the center of the front mirror surface, when being designed, according to a sensitive height of the object required to be sensed, in combination with an illumination cone of the light source and/or light transmittance of the lens, wherein the sensitive height is a height of the object required to be sensed;
• wherein
• selectively activating the light source among the n light sources, whose field of view corresponds to the space of the sensed object, according to the position and the height of the sensed object comprises:
• dividing the n light sources into m zones of light sources according to illumination position areas of the field of view, wherein m is a natural number greater than 1;
• selectively activating the light source in the zone corresponding to the space of the sensed object according to the position and the height of the sensed object;
• and wherein
• the control method further comprises:
• calibrating an image under illumination of each of the light sources to obtain a calibration result of each of the light sources, and calibrating current image frame data acquired under illumination of each of the light sources using the calibration result.