Image measuring instrument by the system composition,image measuring instrument comprises a base, a base,working table, by the Longmen frame, X, Y, Z, Zconnected to the drive shaft to the transmission shaft in the Z direction of the slider motion system, lighting system, camera system and software control system, theillumination system comprises the light source and the bottom light source, the imaging system includes acamera lens and camera, the light source, camera lensare arranged coaxially in a fixed to the light shade on the slider in the Z, the Z to the drive shaft is fixed on theLongmen shelf, the X to drive shaft in Longmen upperlevel frame the beam, the Y to the drive shaft is arranged on the working table on both sides of the Longmen framelongitudinal beam, the latter with two pillar bottomconnecting Longmen frame, the X, Y, Z to the drive shaft is provided with a grating is used to move theposition of the signal transmission to the software part of the control system, including a to limit the camera lensand the light source and the measured distance between the workpiece sensing structure, the sensor structure includes a transmitting sensor, a receiving sensor and a Z to the transmission device, the measurement processthe image measuring instrument division focusing stage,shoot Stage, jointing stage and the computation phase,the specific steps:

1, focusing stage:

1.1, the computer selects a range of measurement, it isa will be measured on a countertop maximum projectionbread included 2D plane.

1.2, the computer sends the signals to the Z to the drive shaft, start the Z axis stepping motor and drive thecamera fixed to the slider on the lampshade moved up and down to focus on Z, also by the regional sensorstructure will be measured the height of the highest point of the feedback to the computer to determine the cameralens and the DUT is the highest point of the distance, thedistance is also known as the effective focal lengthcamera focus, Z to the drive shaft in the grating will nowcamera lens position signal back to the computer to save.

2, shooting stage:

2.1, the computer sends the signals to the X, Y to thedrive shaft, start X, Y axis stepper motor and drive thecamera moves to the starting position measuring rangeon a level surface, then according to the moving path of computer generated, the camera moves to the nextposition in the measuring range.

2.2, every move a certain position, the camera systemshould be based on such as the number of images takenset, camera system extraction is to save the image on the point within the range of 64 * 48mm and the computer.

3, mosaic stage: computer according to each imagewhen the camera position for all image according to thepath of splicing generates a closed integral graph.

4, the computation phase: the shape size of data points and the obtained parts to the edge of the image in the whole graph generated and calculating the relativeposition of the corresponding point of the closed graphon the calculation results, all in accordance with the requirements of storage for the current nominal orcontrast and output to digital and graphics and the name of the value entered in advance.