JPH01137895A - Picture processor - Google Patents

Abstract

PURPOSE:To obtain an optimum picture for measurement in a short period by processing, in the first place, a picture signal obtained from a non-interlace, shifting an object or a video camera until a prescribed picture is obtained, and switching the scanning system to a 2:1 interlace after the prescribed picture is obtained. CONSTITUTION:The scanning system of a video camera 2 is set at the non- interlace, the picture signal is taken in through an A/D converter 5, and the focal coincidence evaluation factor such as the rate of change of a light-and- shade contrast is calculated by picture data. After the storing of a value, a motor 4 is sent by a constant quantity, and a microscope 1 or the video camera 2 is approximated to the object. After its stopping, the picture signal is fetched, and the same processing is carried out. By repeating the processing, the focal coincidence evaluation factor gradually rises, its peak is obtained at a position where an optimum focus is obtained, and thereafter, it falls. The peak position is obtained at a time point when a few steps have passed farther than the peak, and the motor 4 is reversely rotated, and the scanning system is switched to the 2:1 interlace. Thus, automatic focusing can be carried out in a short period.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image processing apparatus used in the manufacturing process of electronic equipment to assemble and inspect objects by visual recognition.

With conventional technology, an image processing device converts an image signal from a video camera that images an object into a digital signal using an analog-to-digital (hereinafter abbreviated as A/D) converter, and converts the digital image signal into a predetermined signal. Process according to the algorithm. Further, the scanning method of the video camera at that time is fixed to either non-interlace or 2:1 interlace.

In the manufacturing process of electronic devices, etc., there are cases where an automatic focusing function is required because the process involves a high-magnification microscope, or a search function is required to search the surrounding area when there are no feature points to be detected within the field of view. In such a case, the obtained image signal is processed, the object or the video camera is moved by a motor until a predetermined image is obtained, and then the image signal is processed and measured.

The conventional image processing yf! described above will be described below with reference to the drawings.
An example of the device will be described.

FIG. 4 shows a conventional processing flow for automatic focusing. First, an image signal is A/D converted at an initial setting position and taken into a video memory. From this data, a focus matching evaluation index such as the rate of change in contrast between light and dark is calculated. After memorizing the value, the motor is fed a constant suspension and the video camera is brought closer to the object. After stopping, the image signal is captured and the same processing as above is performed. When this process is repeated, the focus evaluation index gradually increases, reaches a peak at the most focused position, and then decreases.

When the peak has gone one step too far, the position of the peak is known and the motor is reversed to that position.

After stopping, the image signal is captured again and a predetermined measurement is performed. The scanning method of the video camera during the above processing is fixed to either non-interlace or 2:1 interlace. That is, the conventional image processing apparatus did not have a function of actively switching between non-interlace and 2=1 interlace.

Problems to be Solved by the Invention However, with the above method, when fixed to non-interlace, the processing time per time is 16.7m5ec,
The focus time for repeating this process more than 10 times is short, but since the number of scanning lines during measurement is half that of 2:1 interlace, the measurement accuracy decreases.On the other hand, when fixed to 2:1 interlace, the measured viscosity is Although this method is expensive, it has the problem that the processing time per processing time is 33 m sec and the focusing time becomes long.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an image processing apparatus that can shorten processing time and perform processing without reducing measurement accuracy.

Means for Solving the Problems In order to solve the above problems, the image processing apparatus of the present invention includes:
A video camera that can switch the scanning method between non-interlace and 2:1 interlace using an external signal,
An A/D converter that converts the image signal from the video camera into a digital signal, and an A/D converter that processes the image signal obtained in a non-interlaced manner and allows the object or video camera to be moved until a predetermined image is obtained. control the motor,
The apparatus includes a control circuit that switches to 2:1 interlace after a predetermined image is obtained and processes the 2:1 interlace image signal.

Effect With the above configuration, processing is performed non-interlaced when focusing, so the processing time per time is 16.7m se
The focus time of repeating the process ten times in c is shortened, and since the measurement after focus is performed with 2:1 interlacing, the number of scanning lines is doubled, which has the advantage of high accuracy.

Embodiment Hereinafter, an image processing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an image processing apparatus according to a first embodiment of the present invention. In FIG. 1, 1 is a microscope, and a video camera 2 is attached to the coupling surface of the microscope 1. This video camera 2 is of a type in which the scanning method can be switched between non-interlace and 2:1 interlace by an external signal. The microscope 1 and the video camera 2 are attached to a slide table 3 that can move up and down, and the slide table 3 is dynamically driven by a motor 4, which is electrically driven by a drive circuit 5. . On the other hand, the image signal from video camera 2 is A
/D converter 6 converts it into a digital @ symbol. The control circuit 7 processes the digital signal, controls the motor 4 through the drive circuit 5 so that the camera is in focus, and actively switches the scanning method of the video camera 2 between non-interlace and 2:1 interlace.

The operation of the image processing apparatus configured as described above will be explained. First, the microscope 11 and the video camera 2 are initially set to positions in front of the variation range of the focal position of the object, and the scanning method of the video camera 2 is set to non-interlace. At that position, an image signal is taken in via the A/D converter 5, and a focus matching evaluation index such as a change rate of contrast between bright and dark is calculated from the image data. After memorizing the value, the motor 4 is sent for constant suspension, and the microscope 1 and video camera 2 are brought close to the object. After stopping, the image signal is captured and the same processing as above is performed. When this process is repeated, the focus evaluation index gradually increases, reaches a peak at the most focused position, and then decreases.

When the peak has gone too far, the position of the peak can be determined, and the motor 4 is reversed to that position, and at the same time the scanning method of the video camera 2 is switched to 2:1 interlace. The switching method depends on the type of video camera 2, but in the case of an automatic switching method, it is sufficient to input the vertical synchronization signal and horizontal synchronization signal from the control circuit 7 to the video camera 2 with a half phase shift instead of inputting them simultaneously.

After stopping, image signals are captured and predetermined measurements are performed.

Figure 2 shows the above operation in a flowchart.The difference from Figure 4 is that after the start, the scanning method is set to non-interlaced, and when the motor is reversed to the peak position, the scanning method is changed to 2: 1 interlace.

As described above, according to the present embodiment, a video camera whose scanning method can be switched between non-interlace and 2:1 interlace is used, and an image signal that is blued by non-interlace is first processed, and in this state, a predetermined image is processed. 2: Move the video camera until the desired image is obtained.
By switching to 1 interlace and processing the image signal, automatic focusing can be performed in a short time and measurement can be performed with high precision.

Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a configuration diagram showing an image processing apparatus according to a second embodiment of the present invention. In FIG. 4, reference numeral 8 denotes a pinch roller that is pressed against the rotating part of the object, and this pinch roller 8 is rotated by a motor 9, which is connected to a drive circuit 10.
It is electrically driven by. 11 is a microscope.
A video camera 12 is attached to the joint of the 1tU 11. This video camera 12 is of a type in which the scanning method can be switched between non-interlace and 2:1 interlace by an external signal. An image signal from the video camera 12 is converted into a digital signal by an A/D converter 13.

The control circuit 14 processes this digital signal, controls the motor 9 through the drive circuit 10 so that the measurement point is within the field of view, and activates the scanning method for the video camera 12 as non-interlace or 2:1 interlace. Switch to

The operation of the image processing apparatus configured as described above will be explained. First, the scanning method of the video camera 12 is set to non-interlace. In this state, an image signal is taken in via the A/D converter 13, and it is determined from this image data whether a measurement point exists within the field of view. If not, the motor 9 is constantly suspended and the object is rotated via the pinch roller 8. After stopping, the image signal is captured and processed in the same way as above. This process is repeated until the measurement point appears within the visual field. The motor 9 is stopped at the position where the measurement point appears within the visual field, the scanning method of the video camera 12 is switched to 2=1 interlace, an image signal is captured, and a predetermined measurement is performed.

Effects of the Invention As described above, according to the present invention, a video camera capable of switching the scanning method between non-interlaced and 2:1 interlaced is provided, the image signal obtained in non-interlace is first processed, and in this state By moving the object or the video camera until a predetermined image is obtained, switching to 2=1 interlacing after obtaining the predetermined image, and installing a control circuit to process the image signal, it is possible to obtain the optimal image for measurement. can be obtained in a short time, and the measurement itself can be performed with high precision.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an image processing device according to a first embodiment of the present invention, FIG. 2 is a flowchart of autofocus processing in the same image processing device, and FIG. FIG. 4 is a block diagram showing an image processing apparatus, and is a process flow diagram of autofocus in a conventional image processing apparatus. 1.11...Microscope, 2.12...Video camera,
3...Slide table, 4, 9...Motor, 5,
10... Drive circuit, 6, 13... A/D converter, 7
, 14... control circuit, 8... pinch roll. Agent Yoshihiro Morimoto 1st/--Ikken J Makame 3-Nurai R Tape Can 2nd Com;

Claims (1)

[Claims] 1. A video camera that can switch the scanning method between non-interlace and 2:1 interlace using an external signal, an analog-to-digital converter that converts the image signal from this video camera into a digital signal, and a Process the obtained image signal, control a motor that can move the object or video camera until a predetermined image is obtained, then switch to 2:1 interlacing and process the image signal. An image processing device equipped with a control circuit.