JPS60249006A - Image sensor device - Google Patents

Abstract

PURPOSE:To enable the simultaneous recognition of the dimensional measurement and shape of a substance by usin simultaneously a line image sensor and area image sensor. CONSTITUTION:The image emitted from a substance 1 is formed on an area image sensor 4 recognizing the shape of the substance 1 and line image sensor 5 performing the dimensional measurement of the substance 1 via a lens system 2, and a half mirror divides the image emitted from the substance 1 and gives respectively the sensors 4, 5. A controlling part 6 displays the images of the sensors 4, 5 simultaneously on a monitor television 8. And an image processing device 7 performs the recognition of the shape and dimansional measurement of the substance 1 based on the measured image data.

Description

TECHNICAL FIELD The present invention relates to an image sensor device for recognizing the size and shape of an object.

BACKGROUND TECHNOLOGY Line image sensors have traditionally been used to measure the dimensions of objects.
Some have several thousand bits, allowing highly accurate measurements. Even if such a line image sensor has a large number of focuses, it is difficult to display it as an image on a display means like an area image sensor, and waveform observation with an oscilloscope is essential for adjusting the sensor threshold value.
It was also necessary to use a finder to confirm where all measurements were being made. Furthermore, although such a line image sensor can measure the dimensions of an object with high precision, it is not suitable for shape recognition.

On the other hand, the area image sensor d- has a bit number of several hundred times several hundred and cannot be used for measuring the size of an object, but is suitable for shape recognition. Therefore, if both the line image sensor and the area image sensor are used individually, the characteristics of both cannot be utilized. In particular, adjustments when using a line image sensor were troublesome.

Purpose The purpose of the present invention is to solve the above-mentioned technical problems, improve the troublesome points of using a line image sensor, and provide an image sensor that can perform shape recognition and high-precision measurement at the same time. All equipment is provided.

Embodiment FIG. 1 is a block diagram for explaining the outline of the configuration of an embodiment of the present invention. An image from the object 1 is transmitted through a lens system 2 to an area image sensor 4 that traces the entire shape of the object 1, and to a line image sensor 5 that measures the entire size of the object 1. The half mirror 3 divides the image from the object 1 and supplies it to the -c1 area image sensor 4 and the line image sensor 5, respectively. The control unit 6 displays images from the area image sensor 4 and the line image sensor 5 on the monitor television 8 at the same time.

The monitor television 8 is an image display means, and the image processing device @7 recognizes the shape and measures the size of the object 1 based on the measured image data.

FIG. 2 shows the screen of monitor television 8. As shown in FIG.

As shown in FIG. 2(1), a display portion a by the area image sensor 4 and a display portion by the line image sensor 5 are displayed simultaneously on one screen.

That is, a display portion b'l corresponding to one line by the line image sensor 5 is inserted into the center of a display portion a by the area image sensor 4. In FIG. 2 (2), the number of pixels in the display area a by the area image sensor 4 is 256 horizontally and 91 pixels horizontally.
28-x2, and the number of pixels displayed by the line image sensor 5 is 256 horizontally and 1 vertically.

The line image sensor 5 and the area image sensor 4 have different bit numbers. Therefore, it is not possible to simply insert the display part of the line image sensor 5 into the display part of the image sensor 4. First, it is necessary to set the scanning period of the area image sensor 4 and the line image sensor 5 to be the same in order to secure the display timing. In addition, it is necessary to deal with the difference in the number of 4 and 50 bits of each image sensor. That is, it is necessary to read the memory output written by the line image sensor 5 disposed at the center of the object 1 faster than the memory output for the area image sensor 4. For this purpose, it is necessary to raise the address reading frequency of the memory for the line image sensor 5 higher than the reading frequency of the memory for the area image sensor 4.

Of course, it is also possible for the line image sensor 5 to read one line of the area image sensor 4 at the same frequency, but in that case, the line image sensor 5 will sample all one data for several bits. Become.

FIG. 3 is a block diagram showing an overview of the control section 6 in FIG. 1. It consists of a control section 6Fi, binarization circuits 16 and 19, drive circuits 17 and 18, memories 20 and 22, a pulse generation circuit 21, an address counter circuit 23, a line counter circuit 24, and a mixing circuit 25. Pulse generation circuit 2
1 generates a pulse for scanning one line common to the area image sensor 14 and the line image sensor 15.

The drive circuit 17 drives the area image sensor 14 based on the pulse. let The drive circuit 18 drives the line image sensor 15 based on the pulse. 2
The value conversion circuit 16 converts the output of the area image sensor 14 into 2
The information is converted into a value and given to the memory 20. The binarization circuit 19 binarizes the output of the line image sensor 15 and provides the information to the memory 22 .

The address counter circuit 23 sequentially specifies the addresses of the memories 20 and 22 using pulses from the pulse generating circuit 21. The monitor television 2 is the same as the output of the area image sensor 14 written in the memory 20 and the output of the line image sensor 15 written in the memory 22.
6, the address count frequency of the line image sensor 15 needs to be higher than the address count frequency of the area image sensor 14, as described above. Of course, memory 20 at the same frequency
It is okay to read the contents of and 22, but the resolution of the display will be reduced. Only when performing display, it is possible to read the measurement data in the memory 22 bit by bit at the same count frequency as the area image sensor 14.

Next, the position at which one line of the line image sensor 15 is inserted is given by the line counter circuit 24.

The mixing circuit 25 mixes the output of the line counter circuit 24 when a preset line is reached and the output of the line image sensor 15 at that time with the output taken out from the memory 22, and displays the output on the monitor television 26. to be displayed.

Therefore, the binarization level and measurement position can be determined by viewing the image displayed on the monitor television 26. In other words, it is possible to move the camera section including the area image sensor 14 and the line image sensor 15 and measure the object 1 at a predetermined position, for example, the measurement point A1 in FIG. 4(1) or the measurement point A2 in FIG. 4(2). can.

The principle of calculation for measuring the dimensions of an object will be explained with reference to FIG. An object 5 is located at a distance a in front of the lens 52.
1 is arranged perpendicular to the axis of the lens 52. An image of the object 51 is formed on the line image sensor 53 at a position a distance behind the lens 52. Here, the magnification of the image iM, the focal length of the lens 52 are 11, the length iLs of the object 51 in the field of view of the camera, and the object 5 within the field of view of the lens 52.
1 length? LX, object 51 in image sensor 53
When the image length flX and the element length of the line image sensor 53 are lS, the following first and second equations hold true from the lens formula.

Now, an object 51 of length LS whose dimensions are known as a standard object
and has a length of 7 on the element of the line image sensor 53.
? Suppose that an image of S is obtained. Further, the focal length f is constant, and the lengths LS and l! If S is measured, the first
M, a in the formula and the second formula.

b is determined by the following formula.

b = / (1 + M) ... (5) Also, suppose that an object of length LX is to be measured, the image on the line image sensor 53 has a length of I! If it is X, the length LX at the same distance from the lens 52 is determined by the following formula.

In other words, once the length LS of the standard object 51 is measured,
Equation 6 can be easily claimed0 However, the length I! S is 1 of the line image sensor 53
It can be measured if the vixel and pixel dimensions are known. Generally, one pixel is about 14 μm.

Therefore, the size of the object is measured by the product of the number of pixels whose image is projected on the line image sensor 53 and the size of the pixel. The dimension of the length lX can be similarly measured.

Effects As described above, according to the present invention, by simultaneously using a line image sensor and an area image sensor, it is possible to measure the size and recognize the shape of an object at the same time. Further, adjustment of the measurement position of the object by the line image sensor and adjustment of the threshold value of the line image sensor can be easily performed while viewing the image.

[Brief explanation of drawings]

FIG. 1 is a block diagram for explaining the overall outline of an embodiment of the present invention, FIG. 2 is a diagram for explaining an image projected on the screen of a monitor television 8, and FIG. FIG. 4 is a block diagram showing the electrical internal structure of an embodiment of the invention. FIG. 4 is a diagram for explaining the measurement points of an object by the line image sensor 15. FIG. It is a figure for explaining. 1...Object, 2...Optical system, 3...Half mirror
14°14...area image sensor, 5,15...
・Line agent Patent attorney Kei Nishikyo Part 1 Figure 2 (1) (2)

Claims (1)

[Claims] The image of the object formed through the optical system is simultaneously formed on both the line image sensor and the area image sensor,
One screen is created by inserting the image output of the line image sensor into one line of the area image sensor, and the measurement position of the object by the line image sensor is set. The measurement of the object by the line image sensor and the shape recognition of the object by the area image sensor are performed by performing image processing to display each output of the sensor and the area image sensor on a screen on a display means. Features of the image sensor device.