JPH10233944A - Camera position adjusting image processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discriminate the difference of brightness, position and size with a glance, to roughly adjust it and to shorten an adjusting time by adjusting a camera, watching the display of differential image between binary images. SOLUTION: First, a graphic that becomes a model for a camera adjustment is arranged, and a binary image that is preliminarily registered before adjustment is read from RAM 8 and shown on a monitor 11. Next, when a display mode is switched to a binary image differential mode, a CPU 7 calculates an image that is taken in by a CCD camera 2 in a present camera state, an image that is undergone binarization processing by the CPU 7 in a condition that is the same with when adjusting data is registered and the differential image of a binary image that is preliminarily registered before adjustment. The differential image is transferred to frame memory 6, and converted into an analog signal by a D/A converter 5, and an image pickup signal is shown on the monitor 11. When there is deviation of a position, size and brightness, because the part corresponding to the deviation is shown in white, the position and direction of a camera 2 and the diaphragm of a lens are adjusted until the part becomes completely black.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing device for capturing an image with a CCD camera, and more particularly to an image display device useful for adjusting a camera position after camera replacement or after displacement.

[0002]

2. Description of the Related Art When a CCD camera is replaced or a camera is displaced, setting conditions for specifying an area to be measured on an image (window processing) as a conventional technique of adjusting a camera position such as a position and an orientation of the camera. There is a method to move all at once.

In this method, after the camera is replaced and when the camera is shifted, the position of the camera can be adjusted by moving all the windows registered in advance in the image processing apparatus simultaneously by the shifted amount (simultaneous movement function).

[0004]

In the case of the above prior art,
After the camera is exchanged or in a state of being shifted, all the windows set in advance are moved at the same time, so that the windows may protrude from the image capturing range of the CCD camera. In that case, it is necessary to readjust the position and orientation of the camera. Further, there is a disadvantage that the aperture of the lens cannot be adjusted because there is no element for adjusting the brightness.

[0005]

SUMMARY OF THE INVENTION An image processing apparatus for camera position adjustment according to the present invention comprises an image processing apparatus for adjusting the position of an adjustment object registered before the camera is replaced or before the camera is displaced, and an adjustment object after the camera is replaced or shifted. Means for comparing the value image, the area / centroid, and the average density, which are characteristic parameters of the binary image, and means for outputting and displaying the difference in size, position, and brightness of the object detected by the comparison. It is characterized by.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a block diagram of an image processing apparatus 1.
The CCD camera 2 includes a charge-coupled device that converts an image formed on the CCD surface into an electric signal. The A / D converter 3 converts a video signal from the CCD camera 2 into a digital signal, and the camera / display controller 4 controls the timing of outputting image data captured from the CCD camera 2 to the frame memory 6 and the monitor 11. LSI.
The D / A converter 5 is a converter that converts image data from the camera / display controller 4 into an analog signal and outputs the analog signal to the monitor 11. The frame memory 6 is a CCD camera 2
This is a memory for storing image data obtained by digitally converting the video signal captured from the A / D converter 3. The CPU 7 calculates image processing, registers image processing calculation conditions,
The whole is controlled, and the ROM 9 stores an execution program of the CPU 7. The RAM 8 stores the conditions for image processing calculations set by the CPU 7 and stores the results of image processing calculations.

FIG. 2 is a flowchart for explaining the registration operation of the adjustment data before the camera is replaced or the camera is shifted.

First, a figure serving as a template for camera adjustment is set from image data taken in from the CCD camera 2, image data corresponding to the set adjustment figure is registered in the frame memory 6, From the data, a window of a portion necessary for adjustment and a threshold value which is an optimum binarized image are registered in the RAM 8 (step 1). CPU7
Registers the binary image for adjustment output from the position, size, and threshold value for binarization in the RAM 8 (step 2), and sets the area (in the window range) for size adjustment as detailed adjustment data. Are registered in the RAM 8 as the position adjustment data and the average density as the lens aperture (brightness) adjustment data (steps 3 and 4).

FIG. 3 is a flowchart for explaining the adjusting operation after the camera is replaced and after the camera is displaced.

First, a figure serving as a model for camera adjustment is set, and a binary image registered before adjustment is read from the RAM 8 and displayed on the monitor 11. Next, set the display mode to 2
When the mode is switched to the value image difference mode, the CPU 7 reads the image captured by the CCD camera 2 in the current camera state.
Reference numeral 7 calculates a difference image between the image subjected to the binarization processing under the same conditions as the registration of the adjustment data and the binary image registered before the adjustment. The difference image is transferred to the frame memory 6, and the D / A
The image signal is converted to an analog signal by the converter 5 and is captured on the monitor 11. Examples of the output display are shown in FIGS.
(C) (white in the image display is represented by black in the figure), (a) is a perfect match, (b) is a position shift, and (c) is a size difference. . As is clear from this figure, if there is a deviation in position, size, or brightness, the part corresponding to the deviation is displayed in white, so adjust the position and orientation of the camera and the lens aperture until it is completely black. (Steps 11 and 12).

Further, when fine adjustment is required, an image captured by the CCD camera 2 in the current camera state is stored in the CPU 7.
Compares the area, the center of gravity, and the average density of the binary feature parameter binarized under the same conditions as the registration of the adjustment data with the area, the center of gravity, and the average density registered as the adjustment data in real time. Is adjusted until the average density difference becomes "0"(area; steps 13, 14), (center of gravity; step 1)
5, 16), (brightness; steps 17, 18).

5 (a) and 5 (b) show characteristic parameters (white in the image display is represented by black in the figure), (a) explains the area, and (b) explains the center of gravity. doing.

As described above, first, the size of the difference image between the binary image of the adjustment object registered before the camera exchange or before the camera is shifted and the binary image of the adjustment object after the camera exchange or the camera is shifted is calculated from the difference image. , Shifts and differences in brightness are displayed as white images,
If they match exactly, the screen will be black and you can adjust it roughly. For further fine adjustment, the area and the center of gravity of the binary image feature parameters to be registered before the camera replacement or before the shift, and the average density, and the binary image of the adjustment target after the camera replacement or after the displacement. By comparing the area of the feature parameter with the center of gravity and the average density, it is possible to adjust the size based on the difference in area, the displacement from the difference in center of gravity, and the brightness from the average density. As described above, the adjustment of the camera position and the adjustment of the aperture of the lens are facilitated without changing the position of the window set as the measurement condition.

[0015]

As described above, according to the present invention, since the adjustment can be performed while viewing the display of the difference image between the binary images, the brightness,
Differences in position and size can be determined at a glance, and rough adjustment is possible. Further, fine adjustments can be made while viewing the numerical display of the binary feature parameters (area, center of gravity, Feret diameter). Therefore, it is easy to replace the camera when the camera is out of order or to adjust the position when the camera is displaced due to some external factor, thereby shortening the adjustment time and little affecting the production operation.

[Brief description of the drawings]

FIG. 1 is a block diagram of an image processing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the first half operation of the embodiment of the present invention.

FIG. 3 is a flowchart illustrating a second half operation of the embodiment of the present invention.

FIG. 4 is a diagram showing an output display example according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating characteristic parameters according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image processing apparatus 2 CCD camera 3 A / D converter 4 Camera / display controller 5 D / A converter 6 Frame memory 7 CPU 8 RAM 9 ROM 10 I / O 11 Monitor

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04N 5/232 G06F 15/70 460Z

Claims (1)

[Claims] 1. An area / centroid, which is a feature parameter of a binary image and a binary image, of an adjustment target registered before a camera is replaced or shifted, and an adjustment target after a camera is replaced or shifted. An image processing apparatus for camera position adjustment, comprising: means for comparing average densities; and means for outputting and displaying differences in size, position, and brightness of an object detected by the comparison.