In one embodiment, movement speeds and dummy points could also be decided by using known numerical control path planning methods such as those recognized and/or commercially available for machine instruments, coordinate measuring machines, and the like. Alternatively, such operations could also be carried out manually based on the known target positions and machine movement control limitations. The management system portion one hundred twenty is additional usable to examine workpiece options in such workpiece inspection images, and to store and/or output the inspection outcomes. This process is repeated for a number of photographs in the set of photographs that have been captured.
Such machine vibration may actually slightly distort the frame of a typical machine imaginative and prescient inspection system and alter the expected dimensional relationship between the stage, the workpiece, the digital camera, and the position encoders of the system. Thus, a major "vibration settling time" have to be allowed after the motion is "stopped" and earlier than taking a precision workpiece inspection picture. (The vibration settling time may also be referred to as a settling time, a mechanical settling time, or a mechanical latency, herein.) Such a settling time may be on the order of 10's of milliseconds, or a hundred's of milliseconds, or much more, for varied mechanical methods and numerous required precision levels.
However, it ought to be appreciated that any such instruments, whether at present obtainable or later developed, may be equally used to find out picture acquisition settings and to later perform picture inspection operations, in numerous exemplary embodiments according to this invention. A machine imaginative and prescient inspection system and methodology is supplied for rising the general machine imaginative and prescient inspection system throughput of certain precision machine imaginative and prescient inspection operations. In explicit, in varied exemplary embodiments the method includes performing a set of image acquisition operations for a workpiece with a timing that is independent of the timing of associated picture inspection operations for the workpiece.
The inventors have additionally decided that intermittent stopping and beginning of the relative movement between the camera and the stage or workpiece is particularly problematic for precision machine vision inspection techniques. As one example, rapidly decelerating and/or stopping the relative stage movement inevitably induces a machine vibration that is significant for precision imaging and precision measurement.
This course of is repeated for multiple pictures in a set of pictures which are to be captured. It should also be appreciated that, prior to capturing each of the pictures the consumer will generate workpiece program instructions that select a lens having a desired magnification and that activate a number of of the light sources to offer a desired illumination of the workpiece 20 during picture acquisition.
In many instances it is not sensible to considerably scale back or get rid of this settling time. Furthermore, is it isn't practical to exactly characterize the settling time with respect to all potential working conditions. Thus, for the most dependable and exact operation, a worst case settling time should repeatedly be assumed and allowed for prior to any precision picture acquisition. It ought to be appreciated that in varied exemplary embodiments based on this invention that use a strobe lighting capability, the relative place between the digicam and stage or workpiece that corresponds to the workpiece inspection images should be known to the required precision. In basic, this requires that the position values that are tracked in the motion control interface 132 of the control system portion 120 along the beforehand mentioned X, Y and Z axes, should be latched at the nominal time of the exposure of the corresponding image, and stored in relation to that image.
Accordingly, for a given stage lighting level behind such a gap or periphery, the sunshine intensity that might be obtained in the ensuing images is relatively well known based mostly on identified traits of the machine vision inspection system. Therefore, the entire lighting vectors in such circumstances could also be set to the same acceptable default worth. In varied exemplary embodiments, for such circumstances a stage mild degree may be advantageously set at a stage that corresponds to approximately 70-80% of the response range of the digicam of the machine imaginative and prescient inspection system. At a block 530, a set of movement speeds , dummy positions , and lighting vectors are decided for acquiring the set of workpiece inspection pictures .
Such motion control systems are commercially obtainable and usually recognized to certainly one of odd ability in the artwork. Accordingly, such a trigger sign can be used to control one or both of a strobed mild source and/or the picture acquisition digital camera, to acquired a workpiece inspection picture at a desired goal position based on the principles of this invention. The management system portion 120 is usable to determine image acquisition settings and/or purchase a picture of the workpiece 20 such that the enter picture of the workpiece 20 has desired image characteristics in a area of interest that includes a workpiece characteristic to be inspected. In particular, these instructions will trigger the machine vision inspection system to control the workpiece stage 210 and/or the camera system 260 such that a specific portion of the workpiece 20 is throughout the field of view of the camera system 260 and at a desired focus state.
In various exemplary embodiments, only the addition of machine vision inspection software program methods and/or modifications in accordance with the principles of this invention are included within the retrofit modifications. In explicit, this strategy is possible for techniques which include a camera offering comparatively brief shutter or publicity occasions, and/or that already include a strobe lighting capability. In various different exemplary embodiments, only lighting system modifications related to offering a previously absent strobe lighting capability according to the ideas of this invention are included within the retrofit modifications.
The system features a precision stage that's movable in a number of instructions for scanning, measuring and inspecting chosen options of a workpiece. Smart Cameras are utterly self-contained systems which perform all of the image processing and evaluation work utilizing an on-board CPU. Smart Cameras often characteristic integrated lighting as nicely, making them perfect for easy purposes similar to code reading.
Unfortunately, this simplicity is not with out its drawbacks – on-board reminiscence is of course limited, which means that a complete document of all products inspected is probably not feasible. A PC based imaginative and prescient system uses cameras which transmit images to a control PC which coordinates picture capturing and processing. PC-controlled systems generally ship faster processing occasions – which can be necessary for more complicated applications – and carry the benefit of getting far more reminiscence to store different inspection profiles and inspection pictures. Well known commercially obtainable video instruments may be chosen for the inspection operations, and corresponding operable software parameters could also be decided primarily based on basic or particular experience and information to the machine vision inspection system that may run the inspection operations. Contact machine vision inspection system manufacturer to get your required machine