TW201009326A - Method and system for verifying suspected defects of a printed circuit board - Google Patents

Method and system for verifying suspected defects of a printed circuit board Download PDF

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Publication number
TW201009326A
TW201009326A TW97132361A TW97132361A TW201009326A TW 201009326 A TW201009326 A TW 201009326A TW 97132361 A TW97132361 A TW 97132361A TW 97132361 A TW97132361 A TW 97132361A TW 201009326 A TW201009326 A TW 201009326A
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TW
Taiwan
Prior art keywords
image
image information
photosensitive
information
camera
Prior art date
Application number
TW97132361A
Other languages
Chinese (zh)
Inventor
Levy Meir Ben
Lev Reznik
Original Assignee
Camtek Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority to PCT/IL2007/000419 priority Critical patent/WO2008120182A2/en
Application filed by Camtek Ltd filed Critical Camtek Ltd
Publication of TW201009326A publication Critical patent/TW201009326A/en

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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00Image analysis
    • G06T7/0002Inspection of images, e.g. flaw detection
    • G06T7/0004Industrial image inspection
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00Indexing scheme for image analysis or image enhancement
    • G06T2207/10Image acquisition modality
    • G06T2207/10141Special mode during image acquisition
    • G06T2207/10148Varying focus
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00Indexing scheme for image analysis or image enhancement
    • G06T2207/30Subject of image; Context of image processing
    • G06T2207/30108Industrial image inspection
    • G06T2207/30141Printed circuit board [PCB]

Abstract

A system and a method for verifying suspected defects of a printed circuit board, the system includes: (i) a camera that includes a processor and a group of light sensing elements, whereby the group of light sensing elements is adapted to generate first image information representative of light arriving from the printed circuit board; whereby the processor is adapted to select a portion of the first image information to provide second image information, in response to (a) a displayed image related parameter; (b) a size of the first image information; and (c) second image information transmission limitation; and (ii) a bandwidth limited communication channel adapted to convey the second image information from the camera.

Description

201009326 IX. INSTRUCTIONS: [Technical Field 3 of the Invention] Field of the Invention The present invention relates to a method and system for verifying a suspected defect in a printed circuit board. I: Prior Art 3 Background of the Invention Printed circuit boards (PCBs) are manufactured by extremely complicated manufacturing processes in which various defects occur. Typically, a printed circuit board will be manufactured with a quality control program 'which can include multiple stages' such as inspection and verification to assure its quality. This quality control program is usually executed in two steps. This first step is performed by an automated optical inspection (AOI) system, which may include a camera. In the first step, the AOI will detect the location of the suspected defect. When the 15th step is performed, a checkpoint will attempt to manually or automatically verify whether the suspected defect is a true defect. Typically, the quality control program, and particularly the verification phase, must obtain images of different regions of the PCB and different magnification (zoom) scales of the panel. 20 To date, 'capturing multiple images of different areas of the PCB and their different zoom scales requires machines that densely move the verification system, as well as densely mechanically moving the optical components to change parameters (eg, magnification) And focal length). Moving the camera itself and the optical components of the camera is tedious, time consuming, and costly. 5 201009326 There is therefore a growing need for an efficient method and system that will address these issues and provide a fast, accurate, reliable, and simple means of verifying suspected defects on printed circuit boards. SUMMARY OF THE INVENTION 5 Summary of the Invention A system for verifying a suspected defect in a printed circuit board includes: (1) A camera comprising a processor and a photosensitive element group. The photosensitive element group can generate first image information representing light arriving by the printed circuit board; and the processor can select 10 parts of the first image information to provide second image information 'in response to (a a display image related parameter; (b) a size of the first image information; and (c) a second image information transmission limit; and (ii) a bandwidth limited communication channel may be rotated by the camera Second image information.系统 A system for verifying a suspected defect of a printed circuit board, the system comprising: (i) a camera comprising: a processor and a photosensitive element group, wherein the photosensitive element group can generate a representation by the printing The first image information of the light reached by the circuit board; and the processor compresses at least a portion of the first image information to provide the second image information, so that a second image pixel information system represents the plurality of first image images Pixel information; wherein the processor is responsive to 2〇(a) a display image related parameter; (b) a size of the first image information; and (c) a second image information transmission limit to compress; And (1)) - the bandwidth limited communication channel is capable of transmitting the second image information by the camera. A method for verifying a suspected defect of a printed circuit board, the method comprising: (1) generating, by the photosensitive element group, a first image information representing light arriving from an area of the printed circuit No. 201009326; (9) selecting the The second portion of the first image information provides second image information in response to (a) displaying image related parameters; (b) one of the first image information sizes; and (c) second image information transmission restrictions: And (4) transmitting the second image information through the "bandwidth limited communication channel 5". a method for verifying a suspected defect of a printed circuit board, the method comprising: (i) generating, by the photosensitive element group, image-representative information representing light arriving from a first region of the printed circuit; (9) compressing the The second image information of the first image information is provided in response to (8) a display image), a related image, a size of the first image information, and (4) a second image transmission limit, wherein the compression The method includes generating a plurality of second image cell information, wherein a second image cell information represents a plurality of first image cell information, and (11) transmitting the second image information through a bandwidth limited communication channel. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a verification system and a spur circuit board according to an embodiment of the present invention; FIGS. 2a, 2b and 2c are diagrams showing a photosensitive element group according to an embodiment of the present invention; The first image information is compressed into the second image information; the fourth image shows the image of the sample printed electric 20 board provided by an embodiment of the present invention; the fifth circle shows the verification according to an embodiment of the present invention. A method of printing a circuit board; and FIG. 6 illustrates a method for verifying a printed circuit board in accordance with an embodiment of the present invention. 7 201009326 [Funding Method: j Detailed Description of Preferred Embodiments According to an embodiment of the present invention, a method and a verification system are provided. The verification system includes a camera that is coupled to at least the other components of the verification system by a bandwidth limited communication channel. In order to comply with the transmission channel transmission restrictions, the camera must select a portion of the first image information to provide the second image information. The camera can also respond to one or more display image related parameters that can affect the display of the second image on the display of the verification unit. And the process of obtaining the first image information. The display image related information can be provided by the user, or automatically defined, and the like. Displaying image related parameters may include, for example, a position of a second area that is represented by the second image, exposure time of the second image, brightness, sharpness white balance and color gain, T-ray non-linearity, pixel The number of bits in the format, the touch mode, the strobe mode, etc., and many other display image related parameters are well known to those skilled in the art. Conveniently, the camera acquires first image information representative of light reflected and/or scattered by a first region of a printed circuit board. The first image information is selected to provide second image information representative of light scattered or/or reflected by a portion of the first v region or by the entire image region. The first image is characterized by a specific resolution. The camera can select the portion of the first image that is at a different (usually lower) resolution. Figure 1 shows a verification system just and a printed circuit board (shown as PCB) 102 in accordance with an embodiment of the present invention. The system 丨00 includes a camera 2 and other 201009326 processor 210 and the photosensitive element 220. In accordance with an embodiment of the present invention, camera 200 is positioned by camera handle 202, which can be adapted to position and stabilize camera 200. In accordance with an embodiment of the present invention, system 1A includes or - a plurality of optical members (not shown) that are adapted to direct light from PCB 1 to 2 to camera 200. The verification system 100 further includes a bandwidth limited communication channel 240 that can be adapted to convey the second image information 320 by the camera. Conveniently, the second image information 32〇 will be sent to the display 250 as will be detailed later, but this need not be the case. It is noted that in accordance with an embodiment of the present invention, the verification system 1 can be adapted to deliver the second image information 320 to the external system via the bandwidth limited communication channel 240. The photosensitive element group 220 can be adapted to generate first image information representative of light that is reached by the first region 11 of the printed circuit board (PCB) 102 and sensed by the photosensitive element group 22A. In accordance with an embodiment of the invention, the PCB 102 is positioned on a mount 104. According to an embodiment of the present invention, the photosensitive element group 220 is connected to the processor 210 by a digitizer (not shown), and the digitizer is capable of digitizing the analogized first image information to provide a digital number. An image information is sent to the processor 210 for the first image information of the digit. Conveniently, the digitizer is embedded in the processor 210. The first image information of each digit and the first image information of the analogy 2〇 can be regarded as the first image information. In accordance with an embodiment of the present invention, each of the photosensitive elements of the photosensitive element group 220 can be adapted to detect a single color of information. Typically, the single color can be blue, green or red. An example of a device utilizing such a photosensitive element is a Bayer pattern in which each 2x2 group of adjacent photosensitive elements will contain a 9 201009326 photosensitive element sensitive to blue light, one sensitive to red light bamboo, and two mutual The diagonally opposite photosensitive elements are sensitive to green light. Conveniently, the photosensitive element group 220 is an active pixel sensor (APS) such as a complementary strong metal oxide semiconductor (CM〇s) sensing device. This allows the processor 210 to independently retrieve data from each individual photosensitive element of the photosensitive element set 220 to facilitate full pixel addressing. The processor 210 is responsive to (a) at least one of displaying image-related parameters; (a) a size of the first image asset; and (c) a second image information wheel limitation, and selecting at least the first image information 310 Part of the second image information 1 〇 320 is provided. According to an embodiment of the present invention, the processor 21 can compress at least a portion of the first image information 310 to provide the second image information 320, and the first/second image pixel information system represents the plurality of first images. The pixel information is in response to (4) at least - displaying image related parameters; (9) the first image information (10) is 15 small; and (c) the second image information transmission limitation; according to an embodiment of the present invention, the processor 21 is Additional information may be added to the second image information 320, such as a dummy pixel and/or an image of a predetermined color, such as a black pixel. According to an embodiment of the present invention, the camera 200 can generate a plurality of different images to represent different regions in the first region ,ι〇 without having to move the camera 2 实. According to the embodiment of the present invention, the different regions are two scattered: wherein the second region 120 covers a portion of the first region 110, and the G region covers the other portion of the first region 11 Non-overlapping parts. According to another embodiment of the present invention, 10 201009326, the different regions provide different zoom scales for the same portion of the first region 110. According to an embodiment of the invention, the processor 210 is further capable of transmitting the second image information 320 to the display via the bandwidth limited communication channel 240. Conveniently, the bandwidth limited communication channel 200 includes display data 252 that can be adapted to facilitate connection of the display 250 to the camera 200. In accordance with an embodiment of the present invention, display 250 is capable of simultaneously displaying a plurality of different images of different regions within the first region. According to an embodiment of the invention, the processor 210 is further adapted to associate at least one pixel of the 10th image with a pixel of a third image. Conveniently, the associated connection is used to show a particular location on the PCB 102 in two different second images. According to an embodiment of the present invention, the related connection may be further used by associating a pixel representing the specific location with a previously provided second image including a larger area of the specific bit 15 The distance between two or more specific locations on the PCB 102 shown in two or more different second images is accurately measured. In accordance with an embodiment of the present invention, processor 210 is operable to calculate an equivalent distance of one of the pixels of the second image corresponding to a physical size of a region of the PCB 102 represented by a single pixel. According to another embodiment of the present invention, the processor 210 is further responsive to the same distance of the pixels of the second image to obtain an equivalent distance of one of the third images. In accordance with an embodiment of the present invention, camera 200 further includes a second data cartridge 254 that is adapted to connect an additional camera 11 201009326 (not shown) in a daisy-ring format. In accordance with an embodiment of the present invention, camera 200 includes an external trigger (not shown) that facilitates synchronization of camera 200 with such additional cameras or other external systems. The contact lens 290 is located between the photosensitive element 220 and the first region 11 and is used to guide the optical signal from the first region 11 to the photosensitive element group 220, and can be embedded in the camera. Medium, or located outside the camera, as shown in Figure 1. - In accordance with an embodiment of the invention, the system 1 further includes a user interface 260 for accepting one or more second display image related parameters _ 10 330 by a user. User interface 260 is coupled to processor 210 by user interface data 262. An example of a second display image related parameter that can be corrected by the user, according to different embodiments of the present invention, the position of the second area, the exposure time, the brightness of the second image, and the clarity of the second image. White balance and color gain of the second image, 7-ray non-linearity of the second image, number of bits in the pixel format of the second 5 image, trigger mode, strobe mode, and well-known to those skilled in the art Many other display image related parameters. According to an embodiment of the present invention, the system 1 can receive a position of a suspected defect in the first area 11 by a detection system 270, which is connected by the inspection system information 272. In the processor 210. In accordance with an embodiment of the present month, the system 1 can further receive at least one inspection-based image-related parameter from the inspection 270. Conveniently, the inspection system 27 can automatically or manually detect suspected defects in the PCB 102. It is noted that in accordance with an embodiment of the present invention, the inspection system 270 is more responsive to the additional data collected when the pcB 1〇2 is inspected to cause additional inspections to be based on the relevant parameters and to provide the system to 201009326. In accordance with an embodiment of the present invention, system 100 is more capable of applying video to inspect PCB 102, wherein the following adjustments are implemented in system 100: (a) the camera is a video camera; (b) photosensitive element group 220 The system further generates first video information (not shown) representing light arriving at the first region 110 of the PCB 102 at different times, and (c) the processor 210 is further responsive to (1) at least one display image correlation. a parameter; (ϋ) a bit rate of the first video information; and (iii) a second video information transmission restriction; and selecting at least one part of the first video information to provide a second video information (not Illustrated) having a bit rate substantially smaller than a bit rate of the 10th video information; and (d) the display 250 is responsive to the second video information to display the second video. According to an embodiment of the present invention, the processor 210 is further configured to compress at least a portion of the first video information to provide a second video having a bit rate substantially smaller than a bit rate of the first video information. Information (not shown) and 15 causes a second video pixel information to represent a plurality of first video pixel information in response to (1) displaying at least one image related parameter; (ii) a position of the first video information a second video information transmission limit; and the display 250 is responsive to the second video information to display the second video. According to an embodiment of the present invention, the processor 210 further applies at least one interframe compression algorithm to provide the second video information when compressing at least a portion of the first video 20 information. In accordance with an embodiment of the present invention, system 100 includes a lighting unit, and the illumination scale produced by illumination unit 280 is determined relative to the frame rate of the second video. 13 201009326 In accordance with an embodiment of the present invention, camera 200 includes one or more multi-purpose data ports 282 that connect camera 200 to external units such as illumination unit 280 and filter unit (not shown). Please note that the display data 252 also supports the wireless connection between the camera 2 and the display 250. In accordance with an embodiment of the present invention, some or all of the data 252, 254, 262, 272, and 282 are high speed isochronous real-time data serial bus data. Some or all of the data 埠 252, 254, 262, 272, 282 are FireWire (IEEE 1394). USB2, Giga network messaging (a very high _ 10 speed communication line) or some other data port; the system is designed to respond to the iidc 1.31 standard. In accordance with another embodiment of the present invention, data 252, 254, 262, 272, 282 may be adapted to support wireless communication. In accordance with an embodiment of the present invention, processor 210 and some or all of the data cartridges 252, 254, 262, 272, 282 may be adapted to support an insert-on-start operation. In accordance with an embodiment of the present invention, display 250 and user interface 260 are embedded in integrated interface device 290, such as a personal computer. In accordance with an embodiment of the present invention, camera 200 includes an internal power source (not shown). In accordance with another embodiment of the present invention, camera 200 can be powered by an external power source such as a standard outlet, a dedicated power supply unit (not shown), and integrated interface device 290. In accordance with an embodiment of the present invention, camera 200 includes a camera setting memory unit 230 for storing camera settings when the camera 200 is turned off. The camera 200 can be restarted with the same settings, even when connected to other external units. 14 201009326 2a, 2b, 2c are diagrams showing photosensitive element groups 221, 222, 223 according to an embodiment of the present invention, each of which is shown in each of the blank squares in Figures 2a, 2b, and 2c. The component group 221 is a separate photosensitive element, and in the second block 2, each of the filled cell units is shown - there is a separate photosensor that detects the signal. The equal sign is processed to provide a reference. The second image is described in the following paragraphs. In Figure 2a, the photosensitive element 221 is shown in a rectangular layout. The feeling
The optical element group 221 includes 221 photosensitive elements arranged in (10) (five) 7 lines. Please note that the actual photosensitive element group 221 according to any embodiment of the present invention may contain a sufficiently larger number of photosensitive elements, and the photosensitive element group is provided by way of example only and is intended to simplify and clarify the description of the present invention. It is easy for anyone who is familiar with the technology to understand. By way of example only, and without any intention to limit the scope of the invention, the photosensitive element group 221 may comprise 6624,000 photosensitive elements' arranged in 2208 rows of X3000 rows. 15 All of the photosensitive element groups 220 are capable of generating first image information representative of the optical signal reached by the first region 110 of the pcb 102. Fig. 2b shows that the photosensitive member 222 is arranged in a rectangular layout and is the same size as the photosensitive member group 221. According to an embodiment of the present invention, the processor 21 can further select the first image information generated by the first photosensitive element subgroup such as the subgroup 225 of the photosensitive element group 224. Conveniently, the processor 21 can independently position each of the photosensitive elements of the photosensitive element group 222 independently. The photosensitive elements of the subgroup 225 detect light that is reached by a second region, such as the first region 120. The photosensitive element that is only processed in the subgroup 225 can provide a highly detailed second image of the second region 12〇. 15 201009326 2c illustrates that the photosensitive element group 223 is organized in a rectangular layout and is the same size as the photosensitive element group 221. According to an embodiment of the present invention, the processor 21 can further select a representative photosensitive element subgroup, such as the secondary group 226, by the primary group 227; wherein the secondary group 227 includes some or all of the cameras 200. Photosensitive element. Please note that the photosensitive elements of the subgroup 227 are shown by any filled filled squares, and the representative subgroups 2〇6 of the photosensitive elements are only shown by the squares filled with the twill. For example, the squares labeled 226 (1), 226 (2), 226 (3), etc. According to the example shown in Fig. 2c, the photosensitive element 10 of the representative subgroup 226 is selected from the photosensitive elements of the subgroup 227, and is selected only in each of the sub-groups 227 and in each interval. It is selected by a photosensitive element in a row. Anyone skilled in the art will appreciate that the rows and rows of subgroups 227 are selected in a different manner, for example, only the photosensitive elements included in each nth row and in the mth row will be provided differently. The magnification of the second image and the image quality. Conveniently, in the examples provided herein, m is equal to η. Please also note that the representative subgroups according to other embodiments of the present invention may also be selected in an algorithm different from the foregoing, and the examples provided are merely illustrative of the invention and are not intended to limit the invention. range. The third figure shows that the first image information 311 is compressed into the second image information 20 399. According to an embodiment of the present invention, the processor 210 can compress the first image information including the plurality of first image pixel information to provide the second image pixel information included in the second image information 399, such as a single pixel. Information 329, which compresses a portion of the first image information 311, which represents the 201009326 light sensed by a plurality of photosensitive elements, such as photosensitive elements 229(1) to 229(4), as shown in FIG. In the embodiment of the present invention, the 'subgroup 228 (represented by all filled squares) is divided into groups of photosensitive elements, such as the group 229 'where each group contains a predetermined number of photosensitive elements (for example, 4) Photosensitive elements 229 (1) ~ 229 (4), and presented in a 2x2 group). The processor 210 further adds a signal received by all of the photosensitive elements of each group to provide a single pixel information, such as a single pixel information 329, contained in the second image information. The method described here, also known as storage, is special! Suitable for situations with insufficient lighting. In the preferred case of illumination and in accordance with another embodiment of the present invention, processor 210 is further adapted to divide the resulting sum by a predetermined factor. Conveniently, the predetermined factor is equal to the number of light-emitting elements in each group, so that the average of the signals received from all of the light-emitting elements of each group can be provided. According to an embodiment of the present invention, the processor 21 can further improve the quality of the second image. The processor 210 may be further adapted to improve the quality of the second image by applying a sharpening algorithm to the 15th image information 320, which uses an unclear mask to include (4) applying a Gaussian blurring object. And copying the image information of one of the second image information to obtain a corrected image information of the copy of the second image; and (b) comparing the corrected image information with an uncorrected copy of the second image information 300 And (c) subtracting the corrected image 20 information value and the value of the uncorrected second image information 320, and if the difference between the values is greater than a predetermined threshold, it is determined to respond to a size threshold It will clear the different image elements that are higher than the critical value of the size, and the sharpness of small image details such as photographic particles can be suppressed. Figure 4 contains images 391-396 of sample PCB 103, which is provided by one embodiment of the present invention 17 201009326; wherein camera 200 does not move when ingesting images 391-396. Image 391 presents the first region m of sample pcB 103 in a configuration of one of the systems. The image 391 is selected from the first image information 31, i.e., 5 selects the photosensitive element in each fifth row of the photosensitive element group 220 and in each fifth row. The first image 392 presents a second region 121 that encompasses 64% of the first region 111. The second image 392 is selected from the first image information 31〇. That is, selecting a photosensitive element in each fourth row of the first subgroup of one of the photosensitive elements and 10 in each fourth row; wherein all of the first subgroup including the photosensitive element group 220 are detected from A photosensitive element of the signal of the second region 121. The third image 393 presents a third region 丄22 that encompasses 36% of the first region 111. The third image 393 is selected from the first image information 310, that is, the photosensitive element that selects the pixel in each third row of the second subgroup of the photosensitive elements and 15 in each fourth row; wherein the second The subgroup includes all of the photosensitive elements of the photosensitive element group 220 that detect signals from the third region 122. The fourth image 394 presents a fourth region U3 that encompasses 16% of the first region 111. The fourth image 394 is selected from the first image information 310, that is, the photosensitive element is selected in each second row of the third subgroup of the photosensitive elements and in the second and fourth rows; the third group The group includes all of the photosensitive elements of the photosensitive element group 220 that have detected signals from the fourth region 123. The fifth image 395 presents a fifth region U4 that encompasses 4% of the first region 111. The fifth image 395 is selected from the first image information 310, that is, all the photosensitive elements included in the fourth group of the photosensitive elements are selected; the fourth time 201009326 group includes all the detected elements of the photosensitive element group 220 are detected. A photosensitive element of the signal of the fifth region 124. The sixth image 396 presents a sixth region 125 that covers 2.7% of the first region 111. The sixth image 396 is selected from the first image information 310, that is, selects all the photosensitive elements included in the fifth subgroup of one of the photosensitive elements; the fifth subgroup includes all of the photosensitive element groups 220 detected from A photosensitive element of the signal of the sixth region 125. The portion of the first image information 310 that is responsive to the signal detected by the fifth group is further digitally expanded to provide additional information included in the representative sixth image information. 10 Figure 5 illustrates a method 400 for inspecting a PCB. The method 400 begins with a selection phase 405 of setting up a system to detect suspected defects in a PCB prior to generation. The setting of the one or more actions, such as receiving a PCB for inspection, calibrating the camera, determining a different operating parameter, and many other setting actions are well known to any professional. Stage 405 is followed by a generation stage 410 of generating a first image information and an analogous first of each first digit of the first image information representing the light arriving at the first region of the printed circuit by a photosensitive element group. Image information can be regarded as the first image information. 20 Regarding the example described in the above figures, the generation is performed by the photosensitive element group 220. Conveniently, the generating includes shifting light arriving by the first region of the PCB to a one-shot lens between the camera and the first region. According to an embodiment of the invention, the generating comprises the step 411 of illuminating the PCB with a lighting unit 19 201009326; and the illumination finding generated by the lighting unit is determined relative to a frame rate of a second video, As described later. π & Regarding the example disclosed in the previous drawings, the illumination is performed by the illumination sheet 280. Stage 410 is followed by selection stage 420, that is, by the processor included in the machine, in response to (a) - displaying image related parameters; (匕) 兮 image information - size ·, and (4) second image information transmission Restricting ^ selects a portion of the first image information to provide second image information. 10 Execution For the example disclosed in the previous schema, the choice is made by the processor.
In accordance with an embodiment of the present invention, stage 420 includes a stage 420 of selecting information generated by a sub-group of photosensitive elements of the photosensitive element set. According to an embodiment, stage 421 is followed by a stage 422 of selecting a representative subgroup of a photosensitive element from the subgroup, wherein the subgroup includes at least some of the photosensitive elements of the camera. The selection is performed by: subtracting the first image information representing the light sensed by the subgroup to provide a representative
The second image information representative of the light sensed by the group 7C is included in the second photosensitive element subgroup of the representative subgroup. The example of Xiao Xiao chooses the representative subgroup 'to make the representative subgroup, / in the group, including the sensitization in the second subgroup only included in each interval row and only in each interval row element. Another example is to select only the photosensitive elements contained in each-nth row and in each-mth row. Therefore, with respect to the examples provided herein, m is equal to n. 20 201009326 In accordance with an embodiment of the present invention, stage 420 includes stage 430 for improving at least one quality of the second image. The improvement includes using an unclear mask to sharpen the second image, comprising: (4) applying a Gaussion blur to the second image information to obtain a slightly blurred copy of the second image Modifying the image information; (b) comparing the modified image information with an unmodified copy of the second image information; and (c) subtracting the modified image information value and the unmodified second image information If the value of the value is greater than a predetermined threshold, it is determined to respond to a size threshold, which will clear the different image elements above the critical value of the size, and make the small image The details such as the clearing of the photo granules are suppressed. In accordance with an embodiment of the present invention, stage 420 includes stage 424 for generating a plurality of different second image information representative of different regions in the first region without substantially moving the camera. According to an embodiment of the invention, the different regions are dispersed, wherein the second region covers a portion of the first region and the other region covers another non-overlapping layer portion of the second region. In accordance with another embodiment of the present invention, the different regions provide different zoom scales for the same portion of the first region. In accordance with an embodiment of the present invention, stage 424 is followed by stage 425 by associating at least one picture element of the second image with a picture element of a third picture. The associated link is used to show a particular location on the PCB in two different second images. According to an embodiment of the invention, the correlation is followed by correctly measuring 21 201009326 the distance between two or more specific bits on the PCB displayed in two or more different second images, The pixels that are to represent the particular location are associated with a second image that is previously provided to include a larger area of all of the particular bits. According to an embodiment of the invention, the compressing comprises calculating an equivalent distance of one of the pixels of the second image. According to another embodiment of the present invention, the compressing further comprises obtaining a pixel equivalent distance of the third image in response to the same distance of the pixels of the second image. In accordance with an embodiment of the present invention, stage 420 includes a stage 426 of receiving a second display image related parameter by a user. According to various embodiments of the present invention, the second display image related parameter that can be modified by the user is: the position of the second area, the exposure time, the brightness of the second image, the sharpness of the second image, and the second image. White scale and color gain, T-ray non-linearity of the second image, number of bits in the pixel format of the second image, trigger mode, strobe mode, and many other display image related parameters, It is known to any professional. This phase 406 is facilitated by the user interface 260 with respect to the examples described in the previous figures. In accordance with an embodiment of the present invention, stage 420 includes stage 407 for receiving a location in the first area that is suspected of being trapped by an inspection system coupled to the system. In accordance with an embodiment of the present invention, stage 427 includes display image related parameters that are subject to inspection by the inspection system. Please note that the inspection system is more responsive to the additional data collected when the PCB was inspected to create additional inspection basis parameters and provide them to the system. 201009326 This phase 427 is facilitated by inspection system 270 with respect to the examples described in the previous figures. Stage 420 is followed by stage 430, which passes the second image information through a bandwidth-limited communication channel. Conveniently, the second image information is transmitted to a 5 display 'but not necessarily. Please note that the second image information can also be transmitted to at least one external system. For the example described in the previous figures, the transmission is performed by a bandwidth limited communication channel 24〇. According to an embodiment of the present invention, the stage 430 is followed by a stage 440 of displaying a second image in response to the second 10 image information; wherein the second image information is transmitted from the camera to the camera via a limited communication channel. monitor. Conveniently, the display includes displaying two or more different images simultaneously without moving the camera. With respect to the example described in the previous figures, the "display, by means of the display 25" 15 and the transmission is carried out by a bandwidth-limited communication channel 240. According to an embodiment of the invention, the method The system can be adapted to generate and select a j-propagating wheel, and according to an embodiment of the present invention, video can also be displayed, and (8) the generating includes generating a first-video information representative of the time of the column by the 1st zone of the PCB. (b) the selection includes selecting a portion of the first video information within the camera 20 to provide a second video message having substantially less bit rate than the first video information. Bit rate 1 is responsive to (1) at least - displaying image related parameters; (9) bit TL rate of the first video asset; and (iv) second video information transmission limit; and (4) the transmission includes passing the second video through the bandwidth According to one embodiment of the invention of the present invention, the display includes displaying the second video. According to an embodiment of the invention, the reduction comprises performing __# - the first video. Figure 6 shows the use of pcb Method 5 5 5 Method 500 begins with a selection phase 5〇5, ie, a system is set up to detect a suspected defect of a PCB prior to generation. The setting of the one or more actions, such as receiving a PCB for inspection, calibration The camera determines a different operating parameter, and many of its other setting actions are well known to any professional. Step 10 505 is followed by stage 510, which is to generate a representative of the printed circuit by a photosensitive element group. The first image information of the light reached by the first region can be regarded as the first image information by the first image information of each digit and the first image information of the frequency ratio. The generation is performed by the photosensitive element group 220 15 . Conveniently, the generating includes passing light arriving from a first region of the PCB through a lens lens 'the line between the camera and the first region. According to an embodiment of the invention, the generating comprises a phase 511 of illuminating the PCB with a lighting unit; wherein the illumination 2 generated by the lighting unit is relative to a second video The rate is determined as follows, as will be described later. For the example described in the previous figures, the illumination is performed by illumination unit 280. Stage 510 is followed by stage 520, which is a processor included in the camera. Compressing at least a portion of the first image information to provide - second shadow 24 201009326 image information, which is substantially 5 Lu 1〇is pixel information can represent a plurality of "first" image information, and a second The image 1 displays image related parameters. The second image cell information is responsive to (4) at least the second image information transmission limit. (4) - the size of the image information; and (c) the addition of a single pixel information share, which, for example, refers to a method of the first image information as "storage,". Light sensed by the photosensitive element, such a photosensitive element, wherein the photosensitive element is divided into groups (for example, four sense elements, - the group contains - a predetermined number of photosensitive elements - a single pixel) The field is included in the second image information material. The method of ==Γ is particularly suitable for the case of insufficient illumination, and after knowing "at time" and according to another implementation of the present invention, the second is equal to each group group. Photosensitive element 2: two signals received by all of the photosensitive elements of each group. In the example described in the previous figures, the system is in accordance with an embodiment of the invention, and stage 520 includes stages. 52, that is, the information generated by the photosensitive element of the group of photosensitive elements is selected. According to an embodiment of the invention, stage 521 is followed by stage 520, group = group of people selected - representative photosensitive element times Group; where the group enters = including the camera At least some photosensitive elements. The selection is based on the following information: the first image information representing the light sensed by the subgroup, 25 201009326 to provide the second information representative (four) representative silk components her group sensed All of the photosensitive elements of the representative subgroup are included in the sub-group of the first photosensitive element. The subtraction-side system selects the representative sub-group as follows: The person, 'and the group only contains some photosensitive elements, which are only included in the __ spaced row of the photosensitive elements of the first person group and only in each-interval line. Photosensitive elements included in each row and in each mth row. Therefore, with respect to the examples provided herein, the m is equal to η.
In accordance with an embodiment of the present invention, stage 520 includes stage 523 for improving at least one quality of the second image. 15 20 The improvement comprises using an unclear mask to sharpen the second image, which comprises (4) applying a -Gaussi〇n blur to the copy of the second image information to obtain a blur of the second image (b) comparing the modified image information with one of the second image information 320 to the reconstructed copy of the beech; and (c) subtracting the modified image information The value of the second image information 320 'if the difference between the values is greater than the critical threshold' is determined to be in response to a size threshold, which will be different in the image element limits of the size threshold. However, the sharpness of the image such as the photo grain can be suppressed. In one embodiment of the invention, stage 520 includes stage 524. Used to create a number of different, different areas,
The second image information is representative of the first area and does not substantially move the camera. In accordance with an embodiment of the invention, the different regions are dispersed, the regions covering a portion of the first region, and the other region 26 201009326 covering another non-overlapping portion of the first region. According to another embodiment of the invention, the different regions provide different zoom scales for the same portion of the first region. In accordance with an embodiment of the present invention, stage 524 is followed by stage 525, which is associated with at least one picture element of the second image to a picture element of a third image. The associated link is used to show the particular location on the PCB in two different second images. In accordance with an embodiment of the present invention, the associated continuation is associated with a pixel representing the particular location - a previously provided second image containing a larger region of all of the 10 specific locations. The spacing of two or more specific bits on the PCB shown in two or more different second images is accurately measured. According to an embodiment of the invention, the compressing comprises calculating an equivalent distance of one of the pixels of the second image. According to another embodiment of the present invention, the compression 15 includes obtaining the same distance of the pixels of the third image in response to the same distance of the pixels of the second image. In accordance with an embodiment of the present invention, stage 520 includes stage 526 for accepting a first display image related parameter by a user. An example of the first display image related parameter that can be modified by the user is 20 bits according to different implementations of the present invention, the bit position of the second area, the exposure time, the brightness of the second image, and the clarity of the second image. Degree, white balance and color gain of the second image, gamma ray non-linear of the second image, number of bits in the pixel format of the second image, 'trigger mode, strobe mode, and many other display images Parameters, which are known to any professional. 27 201009326 For the example described in the previous figures, this phase 326 is facilitated by the user interface 260. In accordance with an embodiment of the present invention, stage 520 includes stage 527 of receiving a suspected 5 defect in the first area by an inspection system coupled to the system. In accordance with an embodiment of the present invention, the stage 527 includes display image related parameters that are inspected by the inspection system. Please note that this inspection system is more suitable for the additional information collected in response to inspection of the PCB, resulting in additional inspection-based parameters and is provided to the system. For the example described in the previous figures, this phase 527 is facilitated by the inspection system Spring 10 270. Stage 520 is followed by stage 530 of passing the second image information through a bandwidth limited communication channel. Conveniently, the second image information is transmitted to a display, but this need not be the case. Please note that the second image information can also be transmitted to at least one external system. 15 (d) In the example described in the previous figures, the transmission is performed with a bandwidth limited communication channel 240. According to the embodiment of the present invention, the phase 520 is followed by a phase 540, in which the second image is displayed in response to the second image information; wherein the second image information is transmitted by the camera via a limited communication channel. It is convenient to display the display to include simultaneous or two or more different images one by one without moving the camera. With respect to the example described in the previous figures, the "display, performed with display 250" and the transfer is performed with a bandwidth limited communication channel 240. In accordance with an embodiment of the present invention, the method 5 Tethering can be adapted to produce, pressure 28 201009326
Shrinking, transmitting, and in accordance with an embodiment of the present invention, video may also be displayed, and (a) the generating includes generating the first video information to represent light arriving at a first region of the pcB at different times; (b) the Compressing includes compressing the first video information within the camera to provide a second video message having a bit rate substantially less than a bit rate of the fifth video information in response to (i) at least Displaying image related parameters; (ii) a bit rate of the first video information; and (iii) a first video information transmission restriction, and (4) the transmitting includes transmitting the second video through the bandwidth limited communication channel. According to an embodiment of the invention, the displaying includes displaying the second video in response to the second video information. 1 (4) The present invention - the compression includes applying an interframe compression algorithm to the first video. The invention can be implemented using conventional tools, methods and components. Therefore, the details of such tools, components, and methods are not described in detail herein. In the previous description, there are a number of specific details that will be revealed to provide a thorough understanding of this month. However, it should be understood that the invention may be practiced without resort to the specific details disclosed. The sample embodiments of this month are only a few examples that have been shown and described in the context of this disclosure. It should be understood that the present invention can be utilized in various other combinations and environments and can be varied or modified within the scope of the invention as described. BRIEF DESCRIPTION OF THE DRAWINGS A verification system and a printed circuit board are shown in FIG. 1 according to an embodiment of the present invention; FIGS. 2a, 2b and 2e illustrate a photosensitive element group according to the present invention - 29: 201009326 3 illustrates compression of first image information into second image information; FIG. 4 illustrates an image of a sample printed circuit board provided by an embodiment of the present invention; and FIG. 5 illustrates an embodiment of the present invention A method of verifying a printed circuit board 5; and a sixth drawing showing a method for verifying a printed circuit board in accordance with an embodiment of the present invention. [Main component symbol description] 100...Verification system 102...Printed circuit board (PCB)
103...sample PCB 104.. mount 110 '111...first area 120.121.. second area 122···third area 123...fourth area 124.. .the fifth area 125...the sixth area 200...camera 202...camera her 210.. processor 220, 221, 222, 223... photosensitive element group 222.. sub-photosensitive element group 225, 227, 228... subgroup 229. Group 230... Camera setting memory unit 240... Bandwidth limited communication channel 250. Display 252... Display data bee 254... Second data 埠 260.. User interface 262... User interface information Tan 270... Check System 272...Check System Data 珲280...Lighting Unit 282.. . Multipurpose Data 埠 290... Adapter Lens 》 Integrated Interface Device 310 311... First Image Information 320, 399... Second Image Information 329... Single Pixel information
30 201009326 330...Second display image related parameters 400,500...Inspection method 340...Relevant display related parameters 405~440,505~540...each stage 391~396·.·Image ❿
31

Claims (1)

  1. 201009326 X. Patent application scope: 1. A system for verifying a suspected defect in a printed circuit board.
    10 15 20 A camera comprises a processor and a photosensitive component group, wherein: the optical component group generates a light that is generated by the circuit board by the first image capturing device; and (4) processing the H image suitable for selecting the first video signal. - part to provide second image information in response to (4) a visualization related parameter; (b) one of the first image information size; and W image information transmission restrictions; and - bandwidth limited communication channel The second image information is captured by the camera. 2. If the system for applying for a patent item further includes, the second image information is displayed to display a second image of the second category of the printed circuit board. A zone 3. The system of claim 3, wherein the processor is adapted to improve the quality of the second image. Item 4. The system of claim No. W, wherein the camera generates a plurality of different second image information representing different regions in the first region without substantially moving the photography. The device includes a user interface adapted to be received by a user - the second display image related parameter. The system of claim 1 is more suitable for receiving a position of a suspected defect in the first region by the inspection thread. '' 7. If the patent application system is the oldest system, (4) shows the image phase
    32 201009326 The number is selected from the following groups: exposure time, brightness of the second image, sharpness of the second image, white balance and color gain of the first image, T-ray non-linearity of the second image, in the second image The number of bits in the cell format, the trigger mode, and the strobe mode. 8. The system of claim 1, further comprising a lighting unit; and the processor is adapted to determine a lighting rate of the light produced by the lighting unit in response to a frame rate of the second video. Reference 15 20 9. A system for verifying a suspected defect in a printed circuit board, the system comprising: a camera comprising: a processor and a photosensitive element set, wherein the photosensitive element set is adapted to generate a first image information Representing light arriving by the printed circuit board; and the processor is adapted to compress at least a portion of the first image information to provide second image information, and to cause a second image information to represent the plurality of first images Pixel information, wherein the processor is adapted to compress in response to (a) - displaying image related parameters; (b) one of the first image information size; and (c) a second image information transmission limit; The restricted communication channel can be adapted to convey the second image information by the camera. 10. The system of claim 9, wherein the processor is adapted to compress the first image information by compressing information generated by a subgroup of a photosensitive element. 11. The system of claim 9, wherein the processor is adapted to compress the first image information by compressing information generated by the photosensitive element group. 33 201009326 12. The system of claim 9, wherein the display is adapted to respond to the second image information to display a second image of one of the second regions of the printed circuit board. 13. A method for verifying a suspected defect in a printed circuit board, comprising: 5 generating, by a photosensitive element group, first image information representing light arriving by a first region of one of the printing circuit; A portion of the first image information provides second image information in response to (a) - displaying image related parameters; (b) one of the first image assets; and (c) second image information transmission Limiting; and 1) the second image information transmission - a bandwidth limited communication channel. 14. The method of claim 13 further comprising displaying a second image in response to the image information. 15. If you apply for the full-time section 13 method, the method of earning money includes changing the quality of one of the second images. The method of claim 13, wherein the method comprises generating a different second image information representative of the non-domain within the first region without physically moving the camera. 17. The method of claim 13, wherein the selection is in response to the display of the image related parameters by the user. The method of claim 13, wherein the generating comprises receiving, by the system, a location of the suspected defect in the first region. The method of claim U, wherein the display image correlation parameter is selected from the group consisting of: exposure time, brightness of the second image, > sharpness of the image, white balance of the first image, and color gain ,第 > 34 201009326 7-ray non-linearity of the image, the number of bits in the pixel format of the second image, the trigger mode, and the strobe mode. 20. The method of claim 13, wherein the generating comprises determining a lighting scale generated by the lighting unit in response to a frame rate of a second video, and illuminating the printed circuit board with a lighting unit . 21. A method for verifying a suspected defect in a printed circuit board, comprising: generating a first image information by a photosensitive element group representing light arriving from a first region of the printed circuit; compressing the first image information At least a portion of the second image 10 is provided in response to (a) - displaying image related parameters; (b) one of the first image information sizes; and (c) a second image information transmission limit; The compressing includes generating a plurality of second image pixel information, wherein a second image pixel information represents a plurality of first image pixel information; and transmitting the second image information through a bandwidth limited communication channel. 15 22. The method of claim 21, further comprising displaying a second image in response to the second image information. 23. The method of claim 21, wherein the compressing comprises compressing information generated by the group of photosensitive elements. 24. The method of claim 21, wherein the compressing comprises compressing information generated by a sub-group of 20 photosensitive elements. 35
TW97132361A 2007-03-29 2008-08-25 Method and system for verifying suspected defects of a printed circuit board TW201009326A (en)

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PCT/IL2007/000419 WO2008120182A2 (en) 2007-03-29 2007-03-29 Method and system for verifying suspected defects of a printed circuit board

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI473989B (en) * 2011-11-03 2015-02-21 Univ Nat Kaohsiung Applied Sci Automatic optical inspection system for defect detection of dental floss stick
US9645097B2 (en) 2014-06-20 2017-05-09 Kla-Tencor Corporation In-line wafer edge inspection, wafer pre-alignment, and wafer cleaning
US9885671B2 (en) 2014-06-09 2018-02-06 Kla-Tencor Corporation Miniaturized imaging apparatus for wafer edge
CN110006903A (en) * 2018-01-05 2019-07-12 皓琪科技股份有限公司 Printed circuit board rechecks system, marker method and reinspection method
TWI693386B (en) * 2019-05-09 2020-05-11 聯策科技股份有限公司 System and method for optimally adjusting imaging parameters

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5204912A (en) * 1990-02-26 1993-04-20 Gerber Systems Corporation Defect verification and marking system for use with printed circuit boards
IL101063A (en) * 1992-02-25 1995-03-30 Orbotech Ltd Verification and repair station for pcbs
US7203355B2 (en) * 2002-12-24 2007-04-10 Orbotech Ltd. Automatic optical inspection system and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI473989B (en) * 2011-11-03 2015-02-21 Univ Nat Kaohsiung Applied Sci Automatic optical inspection system for defect detection of dental floss stick
US9885671B2 (en) 2014-06-09 2018-02-06 Kla-Tencor Corporation Miniaturized imaging apparatus for wafer edge
US9645097B2 (en) 2014-06-20 2017-05-09 Kla-Tencor Corporation In-line wafer edge inspection, wafer pre-alignment, and wafer cleaning
CN110006903A (en) * 2018-01-05 2019-07-12 皓琪科技股份有限公司 Printed circuit board rechecks system, marker method and reinspection method
TWI693386B (en) * 2019-05-09 2020-05-11 聯策科技股份有限公司 System and method for optimally adjusting imaging parameters

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