JPH10177654A - Image information processing device - Google Patents

Abstract

(57) Abstract: When displaying image information from an imaging device having a large number of pixels on a display unit having a small number of pixels, it is possible to reliably display a portion where the image information changes. For each image signal corresponding to a predetermined number of pixels, an image signal having a maximum or minimum signal level is extracted and output to a display device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image information processing apparatus suitable for displaying image information from an imaging device having a large number of pixels on a display section having a small number of pixels.

[0002]

2. Description of the Related Art Generally, in a case where image information from an image pickup device having a large number of pixels, for example, a CCD line sensor is displayed on a display portion having a small number of pixels, for example, a liquid crystal display, FIG. Image information is thinned out and displayed.

That is, FIG. 4A shows that the number of pixels is 204
8 shows an image signal from the CCD line sensor 8;
FIG. 4 (B) shows that one line is reduced to 1/16 and 128
4 shows an image signal displayed on a liquid crystal display of a pixel.

[0004]

By the way, an inspection line for imaging a product by the CCD line sensor or the like and monitoring it on a liquid crystal display or the like to inspect the product for defects, for example, a hole in an opaque film or the like. In the case of inspecting the defect of FIG.
As shown by the arrow 9 in FIG. 9A, the level is higher than the level of the image signal in the normal part.

Conventionally, as described above, an image signal from a CCD line sensor is regularly thinned out and displayed on a liquid crystal display, regardless of the level of the signal, as shown in FIG. As described above, in some cases, a change in a pixel signal of several pixels corresponding to a defective portion cannot be displayed due to thinning out, and there is a problem that accurate determination of the presence or absence of a defect cannot be made.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and is intended to display image information from an imaging device having a large number of pixels on a display unit having a small number of pixels. It is an object of the present invention to be able to reliably display.

[0007]

In order to achieve the above-mentioned object, the present invention is configured as follows.

That is, the present invention relates to an image information processing apparatus for processing an image signal from an image pickup apparatus and outputting the processed image signal to a display unit having a smaller number of pixels than the image pickup apparatus, wherein an image signal corresponding to a predetermined number of pixels is provided. An extraction means for extracting an image signal having a maximum or minimum signal level and outputting the extracted image signal to the display unit every time.

According to the above arrangement, since the image signal having the maximum or minimum signal level is extracted for each image signal corresponding to a predetermined number of pixels, a portion where the level of the image signal changes can be reliably displayed. become.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic structural view of one embodiment of the present invention. In this embodiment, description will be made by applying the present invention to a line for inspecting the presence or absence of a hole in an opaque film.

In FIG. 1, 1 is a light source, 2 is an opaque film, 3 is a camera having a built-in CCD line sensor having 2048 pixels, 4 is an image capturing circuit, 5 is an A / D conversion circuit, 6 is A / D. An image memory from which image data from the conversion circuit 5 or image data processed by the CPU 7 is written and read. Reference numeral 7 denotes a CPU which controls each unit and processes the image data as described later. One line is a liquid crystal display having 128 pixels. Note that the image memory 6 and the CPU 7
As described later, it has a function as an extracting means for extracting an image signal having the maximum or minimum signal level.

The image information processing apparatus according to this embodiment is designed to display an image signal from a CCD line sensor having 2048 pixels on the liquid crystal display 8 in which one line having a small number of pixels is 128 pixels. Is output by thinning it to 1/16. In this case, in order to prevent the image signal corresponding to the hole of the opaque film 2 from being thinned out, it becomes impossible to perform an accurate inspection. doing.

That is, by designating the maximum value mode from an input means (not shown), the CPU 7 performs a predetermined number of pixels from the image signal which has been A / D converted and written into the image memory 6. Therefore, for each pixel signal corresponding to 16 pixels, an image signal having the maximum signal level is extracted and written to another area of the image memory 6, and the extracted image signal is read and read out from the liquid crystal display 8.
Is displayed.

Therefore, when the image signal is thinned to 1/16, the image signal having a high signal level corresponding to the hole in the opaque film 2 is reliably extracted and displayed on the liquid crystal display 8. Unlike the conventional example in which signals are thinned out regardless of the level of the signal level, the image signals corresponding to the holes in the opaque film are not thinned out.

Further, in this embodiment, by specifying the minimum value mode from an input means (not shown),
The PU 7 extracts an image signal having the minimum signal level for each pixel signal corresponding to 16 pixels from the image signal that has been A / D converted and written to the image memory 6 and writes the extracted image signal in another area of the image memory 6. The extracted image signal can be read out and displayed on the liquid crystal display 8. This minimum value mode is used, for example, when inspecting the presence or absence of black spots (dirt) on the transparent film.

Also, in this embodiment, the average value mode is designated by input means (not shown),
U7 calculates the average value of the signal level of each pixel signal corresponding to 16 pixels from the image signal that has been A / D converted and written in the image memory 6, writes the average value in another area of the image memory 6, and The written average image signal can be read out and displayed on the liquid crystal display 8.

FIG. 2 is a waveform diagram of an image signal for explaining the operation of this embodiment. FIG.
FIG. 4B shows an image signal displayed on the liquid crystal display 8 in the maximum value mode.
FIG. 3C shows image signals of the superimposed display in the maximum value mode and the average value mode, respectively.

As shown in FIG. 2, a portion where the image signal changes is reliably displayed, and a defective portion such as a hole in the film can be reliably detected.

FIG. 3 is an image signal waveform diagram when this embodiment is applied to the inspection for the presence or absence of a black point on a transparent film. FIG. 3A shows an image signal from a CCD line sensor. FIG. 2B shows image signals displayed on the liquid crystal display 8 in the minimum value mode.

As shown in FIG. 3, a portion where the image signal changes is reliably displayed, and a defective portion such as a black point of the film can be reliably detected.

In the above-described embodiment, the transmission type inspection line has been described. However, it is needless to say that the present invention can be similarly applied to a reflection type inspection line.

[0023]

As described above, according to the present invention, the image signal having the maximum or minimum signal level is extracted for each image signal corresponding to a predetermined number of pixels. It will be displayed reliably.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is a signal waveform diagram for explaining the operation of the embodiment of FIG. 1;

FIG. 3 is a signal waveform diagram for describing the operation of the embodiment of FIG. 1;

FIG. 4 is a signal waveform diagram showing a problem of the conventional example.

[Explanation of symbols]

 2 Film 3 Camera 6 Image memory 7 CPU 8 Liquid crystal display

Claims (1)

[Claims] An image information processing apparatus for processing an image signal from an image pickup apparatus and outputting the processed image signal to a display unit having a smaller number of pixels than the image pickup apparatus, wherein a signal is output for each image signal corresponding to a predetermined number of pixels. An image information processing apparatus comprising extraction means for extracting an image signal having a maximum or minimum level and outputting the image signal to the display unit.