JPH0519939B2 - - Google Patents

Description

[Detailed description of the invention]

[Field of Application of the Invention] Fabric inspection machines are used to inspect defects on the surface of fabrics, which are raw materials for garment manufacturing. Upon completion of the dyeing process, the fabric is inspected and shipped from the factory. Garment factories that receive fabrics also carry out inspections using fabric inspection machines as part of their incoming inspections. The product of the present invention can be used for both. [Background of the Invention] Japanese Patent Application Laid-Open No. 58-46169 is known as a prior art. This is done by spraying ink onto the woven fabric in different colors depending on the cause (by defect), storing the information, and reading it out for inspection. However, there is no example using image processing like the present invention. [Object of the Invention] An object of the present invention is to provide an automatic fabric inspection system that enables highly accurate and highly efficient fabric inspection through automation. [Summary of the Invention] By dividing the image processing function into a rough inspection function and a fine inspection function, it is possible to automatically inspect the surface of fabrics at high speed and with high precision. In rough inspection, images captured by a line sensor are inspected for defects using simple image processing (inter-image calculations and binarization) (in this case, defects of this level are also considered defects, so (There will be enough time for processing.) If a defect is detected, the line speed is reduced and a detailed image of the fabric surface is processed to perform a detailed inspection of the defect. [Embodiment of the Invention] An embodiment of the present invention will be described below. (1) System configuration and role Figure 1 shows an overview of the automatic inspection system according to the present invention. 1 is a fabric inspection machine body that has an inspection area for detecting defects on the surface of the fabric of the fabric to be inspected, and is capable of appropriately marking distinguishable indicators on the fabric of the fabric; 2 is an image processing machine; A defect detector 3 includes a function of a defect detector 3, which is a speed control device for controlling the feeding speed of the fabric in the fabric inspection machine 1. A system console 4, a keyboard 5, and a hard copy typewriter 6 are connected to the defect detection device 2, and are used for man-machine operation and for outputting inspection results. Additionally, a line sensor camera 10 and ITV cameras 9 and 11 are connected to input images of the fabric surface. The above line sensor 10
is provided in the inspection area of the fabric inspection machine 1 and functions as a rough inspection image information acquisition means for acquiring image information for rough inspection from the fabric surface of the fabric. The system functions as a precise image information acquisition means for acquiring image information for detailed inspection from. The ITV camera 11 is used for inspection using transmitted light to detect holes, scratches, etc. 7 is the object to be inspected, which is a roll of cloth, which is placed here at the start of the inspection. 8 is the winding side (reel side) of the object to be inspected. 48 is an object to be inspected while running on the line. 14 is a first intermediate roller;
5 is a second intermediate roller, 16 is a first looper roller, and 17 is a third intermediate roller, which are driven by a motor. 18 is a third intermediate press roller. The running fabric 48 is sandwiched between two rollers 17 and 18 to prevent slippage between the fabric surface and the roller surface. The third intermediate roller is driven by a motor, and a sershin oscillator is attached to the end of the motor shaft so that the number of rotations can be accurately counted. 19 is the fourth intermediate roller; 20
is a fifth intermediate roller driven by a motor. 2
1 is a fifth intermediate presser roller. Here again, the running fabric 48 is sandwiched between the two rollers 20 and 21 to prevent slippage between the fabric surface and the roller surface. 22 is a second looper roller. The looper rollers 16 and 22 are provided to create a loop so that the speed of the inspection section can be freely changed during fabric surface inspection using image processing. This loop allows the line speed of the test surface of the fabric to be changed rapidly. 23 is a sixth intermediate roller. Figure 2 shows a side view of the main body of the inspection machine, and Figure 3 shows a front view. 69
is a motor-driven shaft that supports the roll of dough. 70 is similarly driven by a motor on the winding side shaft. In other words, the above-mentioned rollers and drive motor mutually function to constitute a traveling means that can vary the speed of the cloth passing through the inspection area of the fabric inspection machine 1. Reference numeral 33 indicates a frame of the main body of the inspection machine, and reference numerals 93 and 94 indicate loop grooves added to the frame. Reference numeral 12 denotes a flat illumination device used for inspection using transmitted light. 24 and 25 are illumination devices used for inspection using reflected light. Reference numeral 31 is an interface between the fabric inspection machine main body 1 and the speed control device 3, which inputs information on the looper length into the speed control device 3, and also connects the intermediate shafts 17, 20 and the dough roll shaft 6.
This is an interface for controlling the speed of drive motors 9 and 70. 28 is an interface for inputting images from the line sensor camera 10, and 27 is an interface for inputting images from the ITV camera 9. 29 is also ITV
This is an interface for inputting images from the camera 11. A pulse generator 13 is attached to the end of the third intermediate roller 17 or the end of the motor shaft, and is a pulse generator for measuring the number of rotations of the roller. By detecting the amount of rotation of the third intermediate roller 17 in the traveling means, this sershin transmitter 3 functions as a position information acquisition means for acquiring position information as the amount of feed of the fed-out fabric. 34 is a pulse signal converter. 35 is an interface between the Sershin oscillator 13 and the pulse signal converter 34. 36,
37 is an interface between the pulse signal converter 34 and the defect detection device. FIG. 4 is a block diagram of the defect detection device 2.
38 is the system processor CPU, which uses a 16-bit microprocessor 68000. CPU3
A system console CRT 4 and a keyboard 5 are connected to 8 and used as a man-machine. Hard copy typewriter 6 is a console CRT
It is connected to a console CRT 4 so that the contents displayed in 4 can be typed out. 39 is the main memory, the memory size can be changed as needed, but here
Approximately 512KB to 2MB is practically used.
40 is a system bus. Reference numeral 41 denotes an external storage device, and although a floppy disk is shown here, a fixed disk may be added as necessary. Reference numeral 42 denotes an image processing processor, which is implemented as hardware in order to perform image processing functions at high speed. For example, there are functions that have already been converted into hardware and have been made faster in the world, such as those shown in Table 1 below, which are considered to be effective for fabric inspection.

【table】

〔Effect of the invention〕

As explained above, according to the automatic inspection system according to the present invention, the following specific effects can be expected. A structure in which a fabric inspection machine is provided with an image information acquisition means for rough inspection and an image information acquisition means for detailed inspection, a structure in which a defect detection device is provided with a rough inspection control means and a precision inspection control means, and a speed control device is provided. By making the structure inseparable from the structure that changes and controls the traveling means of the inspection machine to the first speed or the second speed, rough inspections are performed at the first speed during normal inspections, and when a defect candidate is detected. It becomes possible to perform the fabric inspection process at the second speed, which is slower than the first speed, only during the detailed inspection performed at . As a result of the above effects, during normal inspections, rough inspections are performed at a relatively fast speed, and during detailed inspections, detailed inspections are performed at a speed suitable for detailed inspections, resulting in extremely high accuracy without significantly slowing down the inspection processing speed. It becomes possible to perform high-quality fabric inspection processing. The inspection machine is provided with a position information acquisition means and the marking means, the defect detection device is provided with a marking control means, and the speed control device controls the traveling means of the inspection machine to a position suitable for the operation of the marking means. By making the configuration inseparable from the configuration for changing control to three speeds, it becomes possible to attach an index according to the amount of feed of the fabric. As a result of the above effects, it is possible to obtain the positional information of defects evaluated and judged as defects through detailed inspection as relative positions with respect to the index attached by the marking means, and defects caused by expansion and contraction of the fabric. Deterioration in reliability of location information can be minimized. Moreover, since the detailed inspection control means of the defect detection device evaluates and judges the defect candidates detected by the rough inspection control means, it is possible to evaluate the defect candidates detected by the rough inspection control means. There will be no variation in test results due to factors such as Due to the above effects, fabric inspection can be performed continuously for a long time with a certain level of accuracy, and fabric inspection can be performed automatically and with high efficiency.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the automatic fabric inspection machine of the present invention. FIG. 2 is a side view of the inspection machine main body 1, and FIG. 3 is a front view. FIG. 4 is a block diagram of the defect detection device 2. FIG. 5 is a detailed explanation of the main body of the inspection machine and shows the loop control mechanism. FIG. 6 shows an example of a speed control system for the inspection machine body. Figure 7 shows
An example of a motor speed control principle using a loop control mechanism is shown. FIG. 8 is a diagram for explaining the relationship between three modes: rough inspection, detailed inspection, and print output. FIG. 9 is a diagram showing the principle of motor speed control for driving the intermediate roller in each mode, and FIG. 10 is a diagram quantitatively showing the relationship between the fabric scale display and the error in position information. FIG. 11 is an example of displaying the defect position relative to the reference point. Figure 12 shows
This is an example of displaying absolute coordinates of a defect position. Figure 13 shows
It is a figure which shows the estimation method of a defect position by a relative coordinate system. FIG. 14 shows the types of fabric defects and how to use reflected light and transmitted light. FIG. 15 shows a defect detection mechanism using transmitted light. FIG. 16 shows a mechanism for capturing the rotational position of the intermediate roller. 1st
FIG. 7 shows another example of the method of driving the intermediate roller. FIGS. 18A to 18C are examples of a mechanism for outputting marks and characters on cloth. FIG. 19 is an example of a mechanism for attaching a label to fabric. FIG. 20 shows an example of a procedure for outputting characters or symbols onto cloth. FIG. 21 shows an example of the processing function of the pulse signal converter. FIG. 22 similarly shows another example. FIG. 23 shows an example of a dirt defect image in the 24th image.
The figure is an example of the brightness histogram. 25th
The figures also show a binarized image, FIG. 26 shows a labeling image, and FIG. 27 shows an example of area calculation for labeling. FIG. 28 is an example of rough defect detection processing, and FIG. 29 is an example of detailed defect inspection processing.
FIG. 30 is an explanatory diagram of the spatial product-sum operation used for detailed inspection. FIG. 31 is an example of a dirt detection algorithm. FIG. 32 and FIG. 33 are explanatory diagrams of shading. Figure 34 shows an example of the detection algorithm for count unevenness, and Figure 35 and 3
FIG. 6 shows an example of defect detection using the transmission method.
37 and 38 are drawings for explaining the accuracy of fabric inspection by image processing.
FIG. 8 shows an explanatory diagram of resolution using the line sensor method. 1... Main body of inspection machine, 2... Defect detection device, 3...
...Speed control device for inspection machine body, 4...System console, 5...Keyboard, 6...Hard copy typewriter, 7...Cloth (feeding side), 8
... Cloth (winding side), 9 ... ITV camera (for precise flaw detection), 10 ... Line sensor camera (for coarse flaw detection), 11 ... ITV camera (for transmitted light inspection), 12 ... Flat surface Illumination device, 13...Selsin transmitter, 14...First intermediate roller, 15...Second
Intermediate roller, 16...First looper roller, 17
...Third intermediate roller (motor driven), 18...Third intermediate press roller, 19...Fourth intermediate press roller, 20...Fifth intermediate roller, 21...Fifth intermediate press roller, 22...No. 2 looper roller, 23
...Sixth intermediate roller, 24...Lighting device, 25...
...Lighting device, 26...Cover, 27...Interface (ITV camera), 28...Interface (line sensor), 29...Interface (ITV camera), 31...Interface (for speed control), 32...Interface (fabric inspection machine controller), 33...fabric inspection machine body frame,
34...Pulse signal converter, 35...Interface (Celsin), 36...Interface (pulse signal converter), 37...Interface (pulse signal converter), 38...CPU, 39...
Main memory, 40...Bus, 41...External storage memory (F/DISC), 42...Image processor, 43
...Image memory, 44...Image memory, 45...
Line sensor support, 46... Process input/output mechanism (Pio), 47... Serial interface mechanism (UPif), 48... Fabric (cloth) being inspected, 4
9... Frame, 50... Frame, 51... Hole for light passage, 52... Hole for light passage, 53-56...
Light source, 57-60...Beam sensor mechanism, 61-
64...Lens mechanism, 65-68...Interface (for beam sensor), 69...Dough roll support shaft (upper side), 70...Dough roll support shaft (lower side), 71-82...Bearing , 83...
... Drive motor for unreel shaft, 84 ... Drive motor for upper intermediate shaft, 85 ... Drive motor for lower intermediate shaft, 86 ... Drive motor for reel shaft, 8
7...Flat lighting device case, 88-89...Incandescent light, 90...Diffuser, 91...Stage glass, 92...Defects on fabric (hole scratches), 9
3...Loop groove, 94...Loop groove, 95...Inspection stage portion, 96...V belt, 97...Ink tank, 98...Print head, 99...Ink delivery tube, 100...Ink discharge hole (multi-row), 10
DESCRIPTION OF SYMBOLS 1... Ink discharge hole (single row), 102... Frame, 103... Label paper, 104... Label reel, 105... Label pressing roller, 10
6... link mechanism for knife, 107... knife,
108... Knife guide, 109... Receiving roller, 110... Input image, 111... Defect on fabric, 112... Defect on fabric.

Claims (1)

[Scope of Claims] 1. An inspection area for detecting defects on the surface of a fabric to be inspected, a traveling means capable of varying the speed at which the fabric passes through this inspection area, and a position information acquisition means for obtaining positional information as the amount of feed of the sent-out cloth; a marking means for attaching an identifiable index to the cloth; and a marking means provided in the inspection area to obtain image information for rough inspection. A fabric inspection machine comprising a rough inspection image information acquisition means for acquiring image information for a rough inspection, and a detailed inspection image information acquisition unit provided in the fabric inspection area to acquire image information for a detailed inspection; and position information of the fabric inspection machine. a marking control means that operates the marking means according to the amount of fabric fed out based on the position information from the acquisition means; and a rough inspection that detects defect candidates based on the image information input from the image information acquisition means for rough inspection. A control means evaluates and determines the defect candidates detected by the rough inspection control means based on the image information input from the image information acquisition means for detailed inspection, and also evaluates the defect candidates with respect to the index attached to the fabric by the marking means. a defect detection device comprising a detailed inspection control means for outputting defect information including defect position information indicating a relative position; a second speed slower than the first speed while the detailed inspection control means is conducting a detailed inspection of the defect candidate, and a second speed suitable for the operation of the marking means while the marking control means is operating the marking means. an automatic fabric inspection system characterized by comprising: a speed control device that controls the running means of the fabric inspection machine to feed each piece of fabric at a third speed;