JP2004171345A - Image reading apparatus and image reading method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reading apparatus and an image reading method that can acquire correct image data even if a plurality of image capture areas overlap partially in an imaging field. <P>SOLUTION: The image reading device reads in an image of an imaged object after a pixel selection part 12 selects pixels for outputting pixel signals from a plurality of pixels 11a of a light reception part 11 according to pixel selection information. If there is an overlap where a plurality of image capture areas overlap, a pixel signal writing control part 16 provides control so as to store pixel signals output by the first selection from pixels corresponding to the overlap in an image storage part 18 and not to store pixel signals output by the second and subsequent selections in the image storage part 18. This can avoid writing in abnormal pixel signals from the pixels in the overlap from which image signals have once been read out to thus acquire correct image data. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image reading device and an image reading method for reading an image of an imaging target.
[0002]
[Prior art]
An electronic component mounting apparatus that mounts electronic components on a substrate generally includes an image reading device for recognizing the position of the electronic component. Positioning is performed based on the position. Such an image reading apparatus uses an image pickup unit such as an area sensor. In this area sensor, pixels each having a light receiving element for storing a charge corresponding to the amount of received light are two-dimensionally arranged in a lattice. When an optical image of an imaging target is formed on the area sensor, electric charges corresponding to the optical image are stored in the light receiving elements of each pixel. By outputting this electric charge as an electric signal (pixel signal), two-dimensional image data of an imaging target can be obtained.
[0003]
As this area sensor, a CMOS type area sensor is used instead of the CCD type area sensor conventionally used. This CMOS area sensor can selectively output a pixel signal from an arbitrary pixel among a large number of pixels constituting the area sensor. Therefore, when simultaneously capturing a plurality of electronic components held by the multi-nozzle type work head, it is possible to set only a range corresponding to each electronic component in the field of view as an image capturing range. Therefore, there is an advantage that the image reading time can be significantly reduced by eliminating a useless time for outputting a pixel signal from an unnecessary pixel (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-2002-51261
[0005]
[Problems to be solved by the invention]
However, in a conventional observation apparatus using a CMOS type area sensor, when the image capturing range is set according to a plurality of electronic components in the imaging field of view as described above, the following inconvenience occurs. There is. The image capture range is set based on the position and size of each electronic component in the field of view while being held by the work head. At this time, the image capture range completely encompasses the electronic component. Since the size is set to have a margin as described above, a plurality of set image capturing ranges may partially overlap.
[0006]
When outputting a pixel signal from each pixel in a plurality of image capturing ranges including such an overlapping range, the following situation occurs. First, considering two overlapping image capturing ranges, in the preceding capturing range in which image capturing is performed first, pixel signals are normally output from each pixel in the image capturing range without any problem.
[0007]
However, when a pixel signal is output from the succeeding capture range in which the next image capture is performed, the pixel signals of the pixels belonging to the overlap range are already output at the time of output of the preceding capture range. There is no longer any charge accumulation in the pixel corresponding to the correct pixel signal. For this reason, the pixel signal output from the succeeding capture range includes an abnormal signal, and correct image data cannot be obtained. As described above, the conventional image reading apparatus has a problem that correct image data cannot be obtained when a plurality of image capturing ranges partially overlap within the imaging field of view.
[0008]
Therefore, an object of the present invention is to provide an image reading apparatus and an image reading method that can obtain correct image data even when a plurality of image capturing ranges partially overlap in an imaging visual field. And
[0009]
[Means for Solving the Problems]
The image reading device according to the first aspect includes a light receiving unit having a light receiving surface composed of a plurality of pixels, and a pixel selecting unit that individually selects pixels of the light receiving unit and outputs a pixel signal from the selected pixel. A camera, an image storage unit that stores the pixel signal as image data, and a pixel signal writing control unit that controls writing of the pixel signal to the image storage unit. An image reading device that selects a pixel by the pixel selection unit based on pixel selection information that specifies a pixel corresponding to an image capturing range for reading an image and outputs a pixel signal, and includes a plurality of imaging targets. When the image is received by the light receiving unit at the same time, an overlapping range occurs in which a plurality of image capturing ranges corresponding to these imaging targets overlap, and thus the pixel selecting unit causes the overlapping range. When one of the pixels corresponding to the overlapping range is selected a plurality of times, the pixel signal output by the first selection for the pixel corresponding to the overlapping range is stored in the image storage unit, and the second and subsequent selections are performed. The pixel signal writing control unit controls so that the output pixel signal is not stored in the image storage unit.
[0010]
The image reading device according to a second aspect is the image reading device according to the first aspect, wherein the pixel signal writing control unit sets a plurality of storage areas in the image storage unit.
[0011]
The image reading apparatus according to claim 3, further comprising an image processing unit that performs image processing of image data stored in the plurality of storage areas, the image reading apparatus including: If there is a missing portion corresponding to the overlapping range in the data, image processing is performed by supplementing the portion corresponding to the overlapping range from the image data stored in another storage area.
[0012]
An image reading apparatus according to a fourth aspect of the present invention is the image reading apparatus according to the first aspect, wherein imaging object data including information on an image capturing range corresponding to the imaging object, and an imaging target appearing in a field of view of a camera. A data providing unit that provides schedule data including information on the position of the object in a time-series manner; and a pixel selection unit that generates pixel selection information based on the information on the image capturing range and the information on the position of the imaging target. An information generating unit, and an overlapping range detecting unit that detects an overlapping range of a plurality of image capturing ranges, wherein the pixel signal writing control unit is configured to perform the pixel signal writing control based on the pixel selection information and information on the overlapping range detected by the overlapping range detecting unit. Thus, writing of pixel signals to the image storage unit is controlled.
[0013]
The image reading method according to claim 5, wherein images of a plurality of imaging objects located in a field of view of a camera are simultaneously received by a light receiving surface formed of a plurality of pixels, and each of the imaging objects set in the field of view is received. An image reading method for individually selecting pixels corresponding to an image capture range and outputting pixel signals, and storing the output pixel signals as image data in an image storage unit in which a storage area is set, wherein When one of the pixels corresponding to the overlapping range is selected a plurality of times by the pixel selection unit due to occurrence of an overlapping range where the image capturing range overlaps, an output is performed by first selecting the pixel corresponding to the overlapping range. The stored pixel signals are stored in the image storage unit, and the pixel signals output by the second and subsequent selections are not stored in the image storage unit.
[0014]
7. The image reading method according to claim 6, wherein a plurality of storage areas are set in the image storage unit, and the image data stored in the plurality of storage areas by the image processing unit. Is performed, and the image data in one storage area is supplemented with a portion corresponding to the overlapping range to perform the image processing.
[0015]
The image reading method according to claim 7, wherein the pixel selection information includes information on an image capturing range corresponding to an imaging target appearing in a field of view of a camera, and an image capturing target. Is generated based on the information on the position in the field of view.
[0016]
According to the present invention, when one of the pixels corresponding to the overlapping range is selected by the pixel selection unit a plurality of times due to the occurrence of the overlapping range in which the plurality of image capturing ranges overlap, the pixel corresponding to the overlapping range is selected. By storing in the image storage unit the pixel signal output by the first selection with respect to the pixel signal writing control unit so that the pixel signal output by the second and subsequent selections is not stored in the image storage unit. Even when a plurality of image capturing ranges partially overlap within the field of view, correct image data can be obtained.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
(Embodiment 1)
FIG. 1 is a perspective view of an electronic component mounting apparatus according to a first embodiment of the present invention, FIG. 2 is a block diagram illustrating a configuration of an image reading apparatus according to the first embodiment of the present invention, and FIG. 4, 5 and 6 are explanatory diagrams of an image capturing range and a pixel selection range of the image reading device according to the first embodiment of the present invention, and FIG. FIG. 8 is a functional block diagram illustrating processing functions of a pixel signal writing control unit of the image reading apparatus according to the first embodiment. FIG. 8 is an explanatory diagram of a storage area of an image storage unit in an image reading process according to the first embodiment of the present invention. FIG. 10 is a flowchart of the image reading process according to the first embodiment of the present invention.
[0018]
First, an electronic component mounting apparatus will be described with reference to FIG. In FIG. 1, an electronic component mounting apparatus 1 includes a component supply unit 3 in which a plurality of electronic component supply units 2 are arranged side by side. The electronic component supply unit 2 stores electronic components (not shown) that are works. The electronic component is supplied to a pickup position by the transfer head 7. The transfer head 7 has a plurality of suction nozzles 7a for sucking and holding an electronic component, and is moved in the horizontal direction by a transfer head drive mechanism 6 including an X-axis table 6X and a Y-axis table 6Y.
[0019]
The transfer head 7 takes out and holds the electronic component from the electronic component supply unit 2 by the suction nozzle 7a, and mounts the electronic component on the substrate 5 transported and positioned by the substrate transport unit 4. The transfer head 7 is a holding unit that holds electronic components. A camera 8 having an illumination unit 9 is arranged between the component supply unit 3 and the board transport unit 4. The camera 8 is an imaging unit of the image reading device 10 shown in FIG. 2, and moves the electronic component held by the suction nozzle 7 a while the transfer head 7 holding the electronic component moves from the component supply unit 3 to the substrate 5. Take an image.
[0020]
Then, the image obtained by this imaging is subjected to recognition processing by the image processing unit 19 shown in FIG. Then, the plurality of electronic components held by the transfer head 7 are sequentially mounted on the substrate 5 while positioning the position of the transfer head 7 with respect to the substrate 5 based on the recognition result. The transfer head moving mechanism 6 is a moving mechanism that relatively moves the transfer head 7 that holds the electronic components with respect to the camera 8 of the image reading device 10.
[0021]
Next, an image reading device 10 that reads an image of an electronic component will be described with reference to FIGS. The image reading apparatus 10 shown in FIG. 2 includes, among the functions of the electronic component mounting apparatus shown in FIG. The elements related to the function that performs The image reading device 10 includes a camera 8 and a control device 13. The control device 13 controls imaging by the camera 8 and processes pixel signals obtained by the imaging.
[0022]
First, the configuration and functions of the camera 8 will be described. As shown in FIG. 2, the camera 8 is provided with a light receiving unit 11 having a light receiving surface composed of a plurality of pixels 11a in a lattice arrangement. An optical image of the object to be imaged is formed on the light receiving unit 11 by an optical system (not shown), and the charge accumulated in the light receiving element of each pixel 11a is output as a pixel signal, thereby reading the image of the object to be imaged. The light receiving unit 11 is connected to the pixel selecting unit 12, and the pixel selecting unit 12 individually selects the pixels 11a of the light receiving unit 11, and outputs a pixel signal from the selected pixel. This pixel selection operation is performed as follows based on the pixel selection information (arrow d) transmitted from the control device 13.
[0023]
As shown in FIG. 3, the pixel 11a forming the light receiving section 11 includes a light receiving element 31 which is a photodiode and an amplifier 32 formed by a plurality of MOS transistors. The amplifier 32 converts the electric charge accumulated in the light receiving element 31 into a voltage and outputs the voltage. A plurality of vertical signal lines LV and a plurality of horizontal signal lines LH are formed in the light receiving section 11 corresponding to the lattice-like arrangement (two-dimensional matrix arrangement) of the pixels 11a, and the vertical signal lines LV are provided in each amplifier 32. And the horizontal signal line LH.
[0024]
The combinations of the vertical signal lines LV and the horizontal signal lines LH connected to the respective amplifiers 32 are all different. The pixel selection unit 12 is connected to the amplifier 32 via the vertical signal line LV, and the pixel selection unit 12 activates the amplifier 32 based on the pixel selection information, that is, a state in which a pixel signal converted into a voltage can be output. To The output of the amplifier 32 is connected to an output line L (out) via a horizontal signal line LH and a gate element 33 for switching. The gate elements 33 are connected one by one to each horizontal signal line LH, and are switched by the pixel selection unit 12 based on the pixel selection information.
[0025]
By forming an optical image on the light receiving section 11, each light receiving element 31 is exposed to light and accumulates electric charges. The charge accumulated in the light receiving element 31 is output as a pixel signal by the switching operation of turning on the amplifier 32 and the gate element 33 in synchronization with the pixel selecting unit 12, respectively.
[0026]
That is, by turning on one of the vertical signal lines LV by the pixel selection unit 12, one row in the horizontal direction of the pixels 11a arranged in a lattice pattern in the light receiving unit 11 is selected. As a result, the amplifier 32 connected to the vertical signal line LV is selected and becomes active. When one of the gate elements 33 is selected and turned on by the pixel selection unit 12, the amplifiers 32 which are in the active state and which are commonly connected to this gate element 33 via the horizontal signal line LH A pixel signal is output via the output line L (out). As described above, the pixel selection operation is performed based on the pixel selection information, and the pixel signal is output only from the pixel 11a specified by the pixel selection information. Note that the image information of the light receiving element 31 of the pixel 11a that has once output the pixel signal is incorrect.
[0027]
Here, the relationship between the visual field of the optical system of the camera 8 and the light receiving surface of the light receiving section 11 will be described with reference to FIG. In FIG. 4, the field of view 23 of the camera 8 indicates a range in which a plurality of imaging targets are read at one time. By receiving light, these electronic components are imaged.
[0028]
In the field of view 23, an image capturing range 24 corresponding to the positions and sizes of the plurality of electronic components in the field of view is set. Then, a pixel selection range 25 corresponding to each image capture range 24 is set in the light receiving unit 11, and pixels belonging to the pixel selection range 25 are determined as pixels corresponding to the image capture range 24 by the above-described pixel selection information. Specified.
[0029]
Next, the control device 13 will be described. 2, the control device 13 includes a pixel selection information generation unit 14, an overlap range detection unit 15, a pixel signal writing control unit 16, an image capture range setting unit 17, an image storage unit 18, an image processing unit 19, and a facility control unit 20. , A schedule data storage unit 21, and a component data storage unit 22. Among these components, the equipment control unit 20, the schedule data storage unit 21, and the component data storage unit 22 are related to the overall operation of the electronic component mounting apparatus shown in FIG. Based on the mounting sequence data and the component data stored in the component data storage unit 22, the setting unit control unit 20 controls the transfer head driving mechanism 6 and the like, so that a predetermined mounting operation is performed.
[0030]
The pixel selection information generation unit 14, the overlap range detection unit 15, the pixel signal writing control unit 16, the image capture range setting unit 17, the image storage unit 18, and the image processing unit 19 are used for the electronic component imaging and recognition processing by the camera 8. Data processing unit for That is, while performing data generation processing required for image capture by the camera 8, the electronic component held by the transfer head 7 is imaged, and the captured pixel signal is image-processed to recognize the position of the electronic component. Do. Then, the position recognition result is sent to the equipment control unit 20, which performs position correction when the transfer component 7 mounts the electronic component on the substrate 5.
[0031]
Next, generation of pixel selection information sent to the pixel selection unit 12 will be described. Here, the pixel selection information is created using schedule data and component data created for controlling the mounting operation of the electronic component. The schedule data storage unit 21 stores mounting sequence data for mounting electronic components on the board 5. The mounting sequence data includes information indicating a mounting order when mounting the electronic components on the substrate 5 by the transfer head 7 and information specifying a suction nozzle 7a that suctions and holds each electronic component.
[0032]
By reading these mounting sequence data into the setting section control section 20, it is possible to specify which type of electronic component is to be taken out by each suction nozzle 7a of the transfer head 7 in the mounting operation and in what order. Therefore, information (arrow a) including data on the position of each electronic component appearing in the field of view of the camera 8 in time series is provided to the image capture range setting unit 17 via the equipment control unit 20. That is, the schedule data storage unit 21 is a schedule data providing unit that provides schedule data that includes information on the position of the imaging target appearing in the field of view of the camera 8 in chronological order.
[0033]
The component data storage unit 22 stores component data including size data of electronic components mounted on the board 5 for each type of electronic component. By reading these component data into the setting control unit 20, data including information (arrow b) regarding an image capturing range when capturing an image with the camera 8 in the mounting operation is transmitted through the setting control unit 20. It is provided to the image capture range setting unit 17. That is, the component data storage unit 22 is an imaging target data providing unit that provides imaging target data including information on an image capturing range corresponding to the imaging target. The schedule data storage unit 21 and the component data storage unit 22 constitute a data providing unit that provides imaging target object data and schedule data.
[0034]
Then, the image capturing range setting unit 17 performs a time-series process including information (arrow a) on the position of the electronic component appearing in the field of view of the camera 8 and information (arrow b) on the image capturing range corresponding to the electronic component. 4), an image capturing range 24 is set in the visual field 23 of the camera 8 according to the electronic component to be imaged, as shown in FIG. Then, information (arrow c) regarding the image capturing range set in the visual field 23 in this way is sent to the pixel selection information generating unit 14 and the overlapping range detecting unit 15.
[0035]
The pixel selection information generating unit 14 is configured to read an image of the imaging target from the plurality of pixels 11a of the light receiving unit 11 based on the information regarding the image capturing range and the information regarding the position of the imaging target. Is generated as pixel selection information for specifying a pixel corresponding to. That is, as shown in FIG. 4, a pixel selection range 25 is set in the light receiving unit 11 corresponding to the image capture range 24 set in the visual field 23, and the individual pixels 11 a in the pixel selection range 25 are set. Pixel selection information (arrow d) for identification is generated. Then, the pixel selection unit 12 of the camera 8 selects a pixel based on the pixel selection information. As a result, a pixel belonging to the image capture range 24 is selected, and a pixel signal (arrow g) output from the selected pixel is transmitted to the pixel signal writing control unit 16.
[0036]
Next, the function of the overlapping range detection unit 15 will be described. First, the overlapping of the image capturing ranges will be described. As shown in FIG. 1, the transfer head 4 holds a plurality of electronic components at the same time by a plurality of suction nozzles 7a. In the area 11, a plurality of image capturing ranges 24 corresponding to the respective electronic components are set. At this time, the image capture ranges are not necessarily set without overlapping each other as in the example shown in FIG. 5, and some image capture ranges are partially set as in the example shown in FIG. May be set redundantly.
[0037]
When there is such an overlap in the image capture range 24 set by the image capture range setting unit 17, the overlap range is detected by the overlap range detection unit 15. That is, when simultaneously receiving images of a plurality of imaging targets, the overlapping range detection unit 15 detects an overlapping range in which a plurality of image capturing ranges corresponding to these imaging targets overlap.
[0038]
Here, the relationship between the above-described pixel selection information and the overlapping range will be described. When generating the pixel selection information, the pixel selection information generation unit 14 generates a plurality of pieces of pixel selection information for specifying the pixels corresponding to each image capturing range, regardless of the presence or absence of the overlapping range. For example, when the image capturing ranges 24a and 24b that do not overlap each other are set in the visual field 23 as in the example illustrated in FIG. 5, the light receiving unit 11 corresponds to the image capturing ranges 24a and 24b, respectively. Pixel selection ranges 25a and 25b are set, and two pieces of pixel selection information for specifying pixels in the image capturing ranges 24a and 24b are generated.
[0039]
Then, as in the example shown in FIG. 6, two image capturing ranges 24c and 24d that partially overlap within the imaging visual field 23 are set, and an overlapping range 24c * d where these two image capturing ranges overlap. Exists, two pieces of pixel selection information for specifying all the pixels including the overlapping range 25c * d in the pixel selection ranges 25c and 25d corresponding to the two image capturing ranges 24c and 24d. Is generated.
[0040]
When a pixel signal is output based on the pixel selection information generated regardless of the overlapping range when the image capturing range is overlapped, the pixel signal is output a plurality of times from the pixel corresponding to the overlapping range. It will be. Since the pixel signals output from these pixels for the second and subsequent times are abnormal signals that do not give correct image data, in the image reading apparatus according to the present embodiment, as described below, Information (arrow f) about the overlapping range detected by the detection unit 15 is sent to the pixel signal writing control unit 16. Then, the pixel signal writing control unit 16 performs the writing control of the pixel signal based on the information on the overlapping range so as to prevent the abnormal signal from being written into the image storage unit 18 so as to obtain correct image data. .
[0041]
When the pixel selection information generation unit 14 generates the pixel selection information, instead of using the information regarding the image capture range which is given in advance as a part of the component data, the image selection is performed based on the information regarding the component size given as the component data. The capture range may be calculated, and information on the calculated image capture range may be used. For example, when the target electronic component has a simple rectangular shape, an image capture range having a size obtained by adding a predetermined visual field margin to the side size of the electronic component is calculated.
[0042]
The pixel selection information generated by the pixel selection information generation unit 14 is sent not only to the pixel selection unit 12 but also to the pixel signal writing control unit 16 (arrow e). Then, the pixel signal writing control unit 16 receives pixel signals (arrows g) from the pixels selected by the pixel selection unit 12 and writes these pixel signals to a predetermined storage area of the image storage unit 18. The writing to the image storage unit 18 is controlled based on the pixel selection information and the information on the overlapping range.
[0043]
Here, the function of the pixel signal writing control unit 16 will be described with reference to FIG. The pixel signal writing control unit 16 includes a pixel signal holding unit 16a, a storage area setting unit 16b, an address generation unit 16c, a write enable address setting unit 16d, and a write enable signal output unit 16e. The pixel signal holding unit 16a temporarily stores the pixel signal (arrow g) sent from the camera 8. At this time, when a new pixel signal is received, the received data is overwritten, and the existing pixel signal disappears. Further, the pixel signal holding unit 16a outputs a trigger signal to the address generation unit 16c at the timing when the pixel signal is held.
[0044]
The storage area setting unit 16b sets a range of addresses output to the image storage unit 18 by the address generation unit 16c according to the pixel selection information (arrow e) sent from the pixel selection information generation unit 14. In the setting of the storage area, when a plurality of pixel selection ranges are set and a plurality of pieces of pixel selection information are generated, the storage area setting unit 16b sets a plurality of storage areas in the image storage unit 18.
[0045]
When outputting the address to the image storage unit 18, the address generation unit 16c increments the address by a trigger signal from the pixel data holding unit 16a. In other words, each time a pixel signal is sent from the camera 8 and held in the pixel data holding unit 16a, the address of the writing destination advances, whereby each pixel within the pixel selection range and the storage of the image storage unit 18 are stored. Correspondence with the address set in the area is always maintained correctly.
[0046]
The write permission address setting unit 16d sets an address to which writing is permitted according to the information on the overlapping range (arrow f) sent from the overlapping range detection unit 15. When writing a pixel signal to the image storage unit 18, the pixel signal is written only to the permitted address. The write permission signal output unit 16e outputs a write permission signal (arrow h) to the storage unit 18 when the address (arrow k) output from the address generation unit 16c is the same as the write permission address. When the image storage unit 18 receives the write permission signal (arrow h), the pixel signal (arrow g) is written to the address of the storage area.
[0047]
Here, the storage area and the address of the image storage unit 18 will be described with reference to FIG. In FIG. 8, reference numeral 18a denotes a memory device of the image storage unit 18. The ranges (a) to (b) and (c) to (d) correspond to one of the pixel selection ranges set in the light receiving unit 11. The storage areas set correspondingly are shown. Here, the storage areas (a) to (b) and (c) to (d) respectively correspond to the pixel selection ranges 25c and 25d shown in FIG. The address areas a1, a2, and a3 in the storage areas (a) to (b) indicate addresses corresponding to the overlapping range 25c * d of the pixel selection ranges 25c and 25d. , A6 also indicate addresses corresponding to the overlapping range 25c * d in the storage areas (c) to (d).
[0048]
When the pixel signal is written to each storage area of the memory 18a, if the above-described overlapping range exists, the writing of the pixel signal from the pixel corresponding to the overlapping range is performed in the first time. Writing is permitted only for the area, and writing of pixel signals from pixels for which pixel signals have already been output is prohibited in the subsequent storage areas. The write permission / prohibition control of the pixel signal is performed by the write permission address setting unit 16 d setting the write permission address based on the information on the overlapping range (arrow f) sent from the overlapping range detection unit 15. Is
[0049]
In the example shown in FIG. 8, in the first writing of the pixel signal for the pixel selection range 25c, all the addresses in the storage areas (a) to (b) are set as the write-permitted addresses, and the overlapping range 25c * d Are written into the storage areas (a) to (b). Then, pixel signals from pixels corresponding to the overlapping range 25c * d are written in the address areas a1, a2, and a3 of the storage areas (a) to (b). Then, in the second writing of the pixel signals for the storage areas (c) to (d), the addresses excluding the address areas a4, a5, and a6 are set as the write-permitted addresses, and are set in the overlapping range 25c * d. Only the pixel signals from the pixels excluding the corresponding pixels are written into the storage areas (c) to (d).
[0050]
That is, in the image reading apparatus having the above-described configuration, when images of a plurality of imaging targets are simultaneously received by the light receiving unit 11, an overlapping range in which a plurality of image capturing ranges corresponding to these imaging targets overlap may occur. When one of the pixels corresponding to the overlapping range is selected by the pixel selecting unit 12 a plurality of times, the pixel signal output by the first selection for the pixel corresponding to the overlapping range is stored in the image storage unit 18, The pixel signal writing control unit 16 controls the pixel signal output by the second and subsequent selections so that the pixel signal is not stored in the image storage unit 18.
[0051]
As a result, a defect caused by outputting a pixel signal again from a pixel for which a pixel signal has already been output at the time of the first writing of a pixel signal, that is, an abnormal signal that does not give correct image data is directly stored in the image storage unit 18. The problem of writing can be prevented.
[0052]
The image processing unit 19 performs image processing of the image data stored in the image storage unit 18. Here, if there is a missing portion corresponding to the overlapping range in the image data of the storage area corresponding to one image capture range, the portion corresponding to the overlapping range is selected from the image data stored in the other storage areas. And image processing is performed.
[0053]
For example, in the example shown in FIG. 6, the image data stored in the storage areas (c) to (d) provided for the pixel selection information corresponding to the pixel selection range 25d has an address area corresponding to the overlapping range 25c * d. Pixel signals are not written in a4, a5, and a6, and the data is not completed as one image. In order to solve this inconvenience, when an image captured from the image capture range 24d is to be subjected to image processing, the image data stored in the storage areas (a) to (b) corresponding to the pixel selection range 25c is used. Then, a portion (address areas a1, a2, a3) corresponding to the overlapping range 25c * d is detected, and the image data in the image capturing range 24d is supplemented. This makes it possible to complete a single image by compensating for the data missing part of the image data acquired based on the image selection information excluding the part corresponding to the overlapping range.
[0054]
This image reading apparatus is configured as described above. Hereinafter, an image reading method will be described with reference to the flow of FIG. In this image reading method, images of a plurality of imaging objects located in a field of view of a camera are simultaneously received on a light receiving surface composed of a plurality of pixels, and image capturing for each imaging object set in the field of view is performed. A pixel corresponding to the range is individually selected, a pixel signal is output, and the output image signal is stored as image data in the image storage unit 18 in which a storage area is set.
[0055]
In FIG. 9, first, an image capture range setting process is performed by the image capture range setting unit 17. Here, first, information on the position of the component within the field of view is read from the schedule data (ST1). Next, information on the image capture range is read from the component data (ST2). Next, an image capturing range is set in the visual field (ST3). In this image capture range setting, based on information on the image capture range corresponding to the imaging target appearing in the field of view of the camera and information on the position of the image capture target in the field of view, a plurality of light beams that are simultaneously received on the light receiving surface are determined. Is set within the field of view of the camera.
[0056]
Thereafter, a pixel selection information generation process is performed (ST4). That is, pixel selection information is generated by the pixel selection information generation unit 14 based on the image capture range set in the field of view, and the generated pixel selection information is transmitted to the camera control unit 12 and the pixel signal writing control unit 16. Is done. Next, based on the image capture range, the overlapping range detecting unit 15 executes a process of detecting an overlapping range (ST5).
[0057]
Thereafter, a pixel selection operation is performed, pixel data is output to the pixel signal writing control unit 16, and the output pixel data is stored in the image storage unit 18 by the pixel signal writing control unit 16 (ST6). The image processing is executed by the image processing unit 19 reading the written image data (ST7).
[0058]
Next, the image signal writing process executed by the pixel signal writing processing unit 16 in the above (ST6) will be described with reference to the flow of FIG. First, the pixel signal holding unit 16a receives pixel data from the camera 8 (ST11). As a result, a trigger signal is output to the address generator 16c. Upon receiving the trigger signal, the address generator 16c generates a write destination address where the pixel data is to be written (ST12).
[0059]
Next, a write permission determination is made for the generated address (ST13). Here, it is determined whether writing is permitted or prohibited, that is, whether the address corresponds to the write permission address set by the write permission address setting unit 16d.
[0060]
Here, if the writing is permitted, a writing permission signal is output from the writing permission signal output section 16e to the image storage section 18, whereby the image signal writing is executed (ST14). If the writing is prohibited, the process proceeds to the next step without writing the image signal. Thereafter, it is determined whether or not all the image signal writing processes have been completed (ST15). That is, it is determined whether or not the writing process has been completed based on whether or not the target address corresponds to the final address. If the writing has not been completed, the process returns to (ST11). Then, the subsequent processes are repeatedly executed, and it is confirmed that all the image signal writing processes are completed in (ST15), and the image signal writing process is ended.
[0061]
(Embodiment 2)
FIGS. 11 and 12 are block diagrams showing the configuration of the image reading apparatus according to the second embodiment of the present invention, and FIG. 13 is a flowchart of a second schedule data creating process in the image reading method according to the second embodiment of the present invention. is there. In the second embodiment, the image reading apparatus having the same function as that of the first embodiment is divided into an image reading unit that actually captures an image and reads an image, and a data creation unit that creates data for reading an image. 11 and 12 show a data creation unit 10A and an image reading unit 10B, respectively. By employing such a configuration, there is an advantage that the data creation operation can be efficiently performed off-line.
[0062]
First, the data creation unit 10A will be described with reference to FIG. In FIG. 11, the first schedule data storage unit 41 and the component data storage unit 42 store the same data as the data stored in the schedule data storage unit 21 and the component data storage unit 22 shown in FIG. The first schedule data includes information on the position of each electronic component appearing in the field of view of the camera 8 (arrow a) in chronological order, and information on the image capture range when the camera 8 captures an image (arrow b). Part data is stored, and these data are sent to the image capture range setting unit 40.
[0063]
The pixel selection information generation unit 44 and the overlap range detection unit 45 have the same functions as the pixel selection information generation unit 14 and the overlap range detection unit 15 shown in FIG. Based on the information on the image capture range (arrow c), pixel selection information (arrow d) and information on the overlap range (arrow f) are generated, respectively.
[0064]
The second schedule data creation unit 46 includes the pixel selection information (arrows d and e) received from the pixel selection information generation unit 44, the information on the overlap range received from the overlap range detection unit 45 (arrow f), and the first The second schedule data is created by combining the first schedule data received from the schedule data storage unit 41. The second schedule data is obtained by adding the above information (arrows d, e, f) to the mounting sequence data which is the data content of the first schedule data. The data content includes all data necessary for the pixel selection operation by the pixel selection unit 12 and the pixel signal writing operation by the pixel signal writing control unit 16.
[0065]
The created second schedule data is stored in the second schedule data storage unit 47 for external output. When the second schedule data is output to the outside, the data is further written to a storage medium 50 such as a CD (compact disk) by a storage medium writing unit 49, and the data is transmitted through the storage medium 49. May be used, and data may be transferred online via the communication unit 48 connected to the communication network.
[0066]
Next, the image reading unit 10B will be described with reference to FIG. The image reading unit 10B includes the same camera 8 and control device 13B as in the first embodiment. The control device 13B includes a facility control unit 50, a pixel signal writing control unit 16, an image storage unit 18, an image processing unit 19, and a second schedule data storage unit 51 similar to the control device 13 shown in FIG. . Here, the equipment control unit 50 excludes the function of the image capture range setting unit 17 from the functions of the setting unit control unit 20 shown in FIG.
[0067]
The second schedule data created by the data creation unit 10A is written and stored in the second schedule data storage unit 51 via the storage medium 50 or the communication unit 48. Then, the second schedule data is read into the equipment control unit 50, and the pixel selection information (arrows d and e) and the information on the overlapping range (arrow f) included in the second schedule data are respectively stored in the pixel selection unit 12, The signal is transmitted to the pixel signal writing control unit 16. Accordingly, as in the example shown in FIG. 2, the pixel selection operation by the pixel selection unit 12 is performed based on the pixel selection information, and the pixel signal writing operation by the pixel signal writing control unit 16 is performed on the pixel selection information and the overlapping range. This is done based on the information.
[0068]
Next, with reference to FIG. 13, a description will be given of a second schedule data creation process in the image reading process by the image reading device separated into the data creation unit 10A and the image reading unit 10B. In FIG. 13, first, an image capturing range setting process is performed by the pixel capturing range setting unit 40. Here, information on the position of the imaging target in the field of view is read from the first schedule data (ST21).
[0069]
Next, information on the image capture range is read from the component data (ST22). Next, an image capturing range is set in the visual field (ST23). In this image capture range setting step, a plurality of image capture targets are determined based on information on the image capture range corresponding to the capture target appearing in the field of view of the camera 8 and information on the position of the capture target in the field of view. Set the image capture range within the camera's field of view.
[0070]
Thereafter, a pixel selection information generation process is performed (ST24). That is, pixel selection information is generated by the pixel selection information generation unit 44 based on the image capturing range set in the field of view, and the generated pixel selection information is sent to the second schedule data generation unit 46. Next, based on the image capture range, the overlapping range detecting unit 45 performs a process of detecting an overlapping range (ST5). Information on the detected overlapping range is similarly sent to the second schedule data creation unit 46.
[0071]
Thereafter, the second schedule data is created by adding the pixel selection information and the information on the overlapping range to the first schedule data (ST26), and the created second schedule data is the second schedule data. It is stored in the storage unit 47 (ST27). The second schedule data is stored in the second schedule data storage unit 26 of the image reading unit 10B via the communication unit 48 or the storage medium 50.
[0072]
In the image reading in the mounting operation, a pixel signal is output by the pixel selection unit 12 performing pixel selection based on the pixel selection information stored in time series in the second schedule data. Correct image data is stored by the signal writing control unit 16 writing the pixel signal into the image storage unit 18 based on the pixel selection information and the information on the overlapping range.
[0073]
As described above, in the image reading apparatuses according to the first and second embodiments, when simultaneously reading images of a plurality of imaging targets, a plurality of image capturing ranges corresponding to the imaging targets overlap each other. When one of the pixels corresponding to the overlapping range is selected by the pixel selection unit a plurality of times due to the occurrence of the range, the pixel signal output by the first selection for the pixel corresponding to the overlapping range is converted into the image signal. The pixel signal writing control unit controls the pixel signal to be stored in the storage unit and not to be stored in the image storage unit by the second and subsequent selections.
[0074]
Thereby, in the overlapping image capturing range, the pixel signal is output from each pixel in the preceding capturing range where the image capturing is performed first, and then the pixel signal is output from the subsequent capturing range. In this case, it is possible to solve the conventional problem that a normal pixel signal is not output for pixels belonging to the overlapping range and correct image data cannot be obtained.
[0075]
【The invention's effect】
According to the present invention, when one of the pixels corresponding to the overlapping range is selected by the pixel selection unit a plurality of times due to the occurrence of the overlapping range in which the plurality of image capturing ranges overlap, the pixel corresponding to the overlapping range is selected. The pixel signal output by the first selection is stored in the image storage unit, and the pixel signal output by the second and subsequent selections is controlled by the pixel signal writing control unit not to be stored in the image storage unit. Accordingly, correct image data can be obtained even when a plurality of image capturing ranges partially overlap in the imaging visual field.
[Brief description of the drawings]
FIG. 1 is a perspective view of an electronic component mounting apparatus according to a first embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of the image reading apparatus according to the first embodiment of the present invention;
FIG. 3 is a configuration diagram of a light receiving unit of the image reading device according to the first embodiment of the present invention;
FIG. 4 is an explanatory diagram of an image capturing range and a pixel selection range of the image reading device according to the first embodiment of the present invention;
FIG. 5 is an explanatory diagram of an image capture range and a pixel selection range of the image reading device according to the first embodiment of the present invention.
FIG. 6 is an explanatory diagram of an image capture range and a pixel selection range of the image reading device according to the first embodiment of the present invention.
FIG. 7 is a functional block diagram illustrating processing functions of a pixel signal writing control unit of the image reading device according to the first embodiment of the present invention;
FIG. 8 is an explanatory diagram of a storage area of an image storage unit in an image reading process according to the first embodiment of the present invention;
FIG. 9 is a flowchart of an image reading process according to the first embodiment of the present invention;
FIG. 10 is a flowchart of an image reading process according to the first embodiment of the present invention;
FIG. 11 is a block diagram illustrating a configuration of an image reading device according to a second embodiment of the present invention;
FIG. 12 is a block diagram illustrating a configuration of an image reading device according to a second embodiment of the present invention.
FIG. 13 is a flowchart of a second schedule data creation process in the image reading method according to the second embodiment of the present invention;
[Explanation of symbols]
8 Camera
10 Image reading device
10A Data creation unit
10B Image reading unit
11 Receiver
11a pixel
12 Pixel selector
13 Control device
14 Pixel selection information generator
15 Duplicate range detector
16 Pixel signal writing control unit
18 Image storage unit
19 Image processing unit
20 Equipment control unit
21 Schedule data storage
22 Parts data storage
23 fields of view
24 Image capture range
25 pixel selection range

Claims (7)

A camera having a light receiving unit having a light receiving surface composed of a plurality of pixels and a pixel selecting unit for individually selecting pixels of the light receiving unit and outputting a pixel signal from the selected pixel, and using the pixel signal as image data An image storage unit for storing, comprising a pixel signal writing control unit for controlling writing of a pixel signal to the image storage unit, an image capturing range for reading an image of an imaging target from among the plurality of pixels. An image reading apparatus that performs pixel selection by the pixel selection unit based on pixel selection information that specifies a corresponding pixel and outputs a pixel signal,
In the case where images of a plurality of imaging targets are received by the light receiving unit at the same time, an overlapping range in which a plurality of image capturing ranges corresponding to these imaging targets overlap occurs, and the overlapping range is determined by the pixel selection unit. When selecting one of the pixels corresponding to a plurality of times, the pixel signal output by the first selection for the pixel corresponding to the overlapping range is stored in the image storage unit, and is output by the second and subsequent selections. An image reading device that controls the pixel signal writing control unit so that the pixel signal is not stored in the image storage unit. The image reading device according to claim 1, wherein the pixel signal writing control unit sets a plurality of storage areas in the image storage unit. An image processing unit that performs image processing of the image data stored in the plurality of storage areas; if image data in one storage area has a missing portion corresponding to the overlapping range, the image data is stored in another storage area; 3. The image reading apparatus according to claim 2, wherein the image processing is performed by supplementing a portion corresponding to the overlapping range from the image data. A data providing unit for providing imaging target object data including information on an image capturing range corresponding to the imaging target, and schedule data including time-series information on the position of the imaging target appearing in the field of view of the camera; A pixel selection information generation unit that generates pixel selection information based on the information about the image capture range and the information about the position of the imaging target, and an overlap range detection unit that detects an overlap range of a plurality of image capture ranges. The pixel signal writing control unit controls writing of a pixel signal to the image storage unit based on the pixel selection information and information on an overlapping range detected by the overlapping range detection unit. The image reading device according to claim 1. Images of a plurality of imaging objects located in the field of view of the camera are simultaneously received by a light receiving surface composed of a plurality of pixels, and pixels corresponding to an image capturing range of each imaging object set in the field of view are set. An image reading method for individually selecting and outputting pixel signals, and storing the output pixel signals as image data in an image storage unit in which a storage area is set,
When one of the pixels corresponding to the overlapping range is selected a plurality of times by the pixel selection unit due to the occurrence of the overlapping range where the image capturing range overlaps, the first selection for the pixel corresponding to the overlapping range is performed. An image reading method, wherein the output pixel signals are stored in the image storage unit, and the pixel signals output by the second and subsequent selections are not stored in the image storage unit. A plurality of storage areas are set in the image storage unit, and image processing of image data stored in the plurality of storage areas is performed by the image processing unit, and the image data in one storage area corresponds to the overlapping range. 6. The image reading method according to claim 5, wherein the image processing is performed by supplementing the part. 6. The pixel selection information is generated based on information on an image capturing range corresponding to an imaging target appearing in a field of view of a camera and information on a position of the imaging target in the field of view. Image reading method.

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