JPS6285565A - Picture reader - Google Patents

Abstract

PURPOSE:To secure the satisfactory variable density and resolution over an entire given area by synthesizing the output of a main sensor array system which reads pictures with the light of high illuminance and the output of a secondary sensor array which reads pictures with the light of comparatively low illuminance after correcting both outputs. CONSTITUTION:An optical leans 4 forms the pictures on an X-ray film 10 produced by the transmitted light of high illuminance on a main sensor array 6. While an optical lens 5 forms the pictures on the film 10 produced by the light of comparatively low illuminance passed through a filter 2 and a mirror 3 from a light source 1 on a secondary sensor array 7. The variable density data on each channel of both arrays 6 and 7 are digitized by sensor electronics circuits 8 and 9 and corrected by a digital arithmetic circuit so as to ensure such characteristics that have a linear change to the photographic density. These two corrected data are given to a linear connection arithmetic circuit in order to secure such characteristics that have a linear change to the photographic density over an entire given area in terms of the output.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention utilizes an all-optical method and an electronic method using an image sensor to capture images, digitize them, input them into a computer, and transmit them remotely. 0 [Prior Art] Conventionally, this type of An example of an image reading device is shown in FIG. 7(a).

As shown in +bl, only the sensor array 23 consisting of one set of CCD line sensors is used for reading. That is, an X-ray film 24 is sent to a roller 25 and runs under a set of light sources 21 housed in a light box, and transmitted light from a slit 26 provided under the light source 21 is transmitted through a lens 22 to a sensor array 23. A sensor array 23 with 2000 channels or 3ooO channels is imaged on the
The output sound is sent to a computer or transmitted over a telephone line.

[Problem that the invention seeks to solve]

In the conventional image reading device described above, the output of the sensor array 23 with respect to the degree of blackening of the X-ray film 24 is as shown in FIG. 8 based on the characteristics of COD.

As shown in FIG. 8, in areas where the degree of blackening of the X-ray film is low, the transmitted light is strong, so the output of the sensor array tends to be saturated and the curve becomes flat, resulting in a disadvantage that the density resolution of reading is poor. In addition, in areas of the X-ray film with a large degree of blackening, the sensitivity of the sensor array is at its limit, resulting in a skewed aperture curve and poor reading resolution in W degrees. Strictly speaking, the curve shown in FIG. 8 differs depending on each channel of the sensor array, so
The degree of blackening of the line film is 0 to 4. When correcting the curve shown in Figure 8 so that it becomes a straight line across the OD, if the calculation constants common to all channels are used, variations in areas with a particularly large degree of blackening will be amplified, resulting in striped noise. Defects such as those that appear in images are rare. In addition, if the characteristics of each channel are measured as a curve, and if the correction calculation is performed for each channel from a curve to a straight line while referring to this, the total calculation time will be longer, so the reading speed will be faster. The shortcoming is that the amount of data is effectively reduced.

[Means for solving problems]

The image reading device vt of the present invention includes a main sensor array system that reads an image using light with high illuminance, a sub-sensor array system that reads the image sound using light with relatively low intensity, and the main sensor array system and the sub-sensor array system. and an arithmetic circuit that corrects and synthesizes all of the outputs.

〔Example〕

The present invention will now be described with reference to the drawings.

FIG. 1a is a side view of an embodiment of the present invention. 1 is a light source consisting of a high-intensity fluorescent lamp with high-frequency lighting.

an optical filter for lowering the brightness of the 2Fi light source 1, 3
is a mirror. An optical system/zip 4 connects the image of the X4-y illuminum 10 with the high intensity transmitted light from the light source 1 onto the sensor array 6, and the optical system/zip 511m connects the image of the X4-y illuminum 10 with the high intensity transmitted light from the light source 1 to the relatively low light source 1 through the filter 2 and mirror 3. An image of the X-ray film 10 obtained by transmitted light of illuminance is focused on the sensor array 7. The lens 4 and sensor array 6 form a main sensor array system, and the lens 5 and sensor array 7 form a sub-sensor array system. 8 and 9 are electronic circuits for the main sensor array system and width sensor array system, respectively, and the D/A
Includes converters, etc. Reference numeral 10 denotes an X-ray film photograph to be read, which is sent to a roller 11.

FIG. 2 is a front view of FIG. 1, in which the sub-sensor array system completely overlaps and hides the main sensor-array system, leaving only the main sensor-array system visible.

In FIG. 3, the five forces from any channel of the sensor array 6 of the main sensor array system are plotted on the vertical axis.

This is a graph showing the degree of blackening of the X-ray film 10 read on the horizontal axis. 31 is a curve based on the actual jet profile and is 0, which differs from channel to channel, but when divided into the left half and the right half, which one? Rather, it has the property that there is little variation between channels in the right half.

FIG. 4 is a graph showing data plotted by measuring the output from the sub-sensor array system in the same manner as in FIG. 3.

The left half of the sensor in the sub-sensor array system 41 has a characteristic that there is little variation between channels. 32 in FIG. 3 is a straight line obtained by correcting the measurement curve 31 by an arithmetic circuit;
42 in FIG. 4 is a straight line obtained by correcting the measurement time J41 by an arithmetic circuit. Directly posted in Figure 5, iJj[51rJ,,
This is the custom-made KJ that is ultimately desired, and is obtained by combining the straight line 32 in FIG. 3 with the I-line 42 in FIG. Figure 6 is an arithmetic circuit that converts the data from the main sensor array system and the sub-sensor array system (iA/L) and then synthesizes it into data having the time characteristic shown in Figure 5, 51vc on one edge. be. The main sensor array and secondary sensor array shown in FIGS. 1 and 2-ζ at 6 and 7 respectively. array, 8 and 9
The part shown in Figure 1 and Figure 2 VC are also shown in Seven Sensor Electronics, and among them, 1c has a corresponding conversion circuit 67 in addition to the A/D converter 66 as a necessary component.
However, when using the functions of this invention, switch 73
The curve 31 in FIGS. 3 and 4 is closed or opened again.
．． 41 can be varied to obtain an optimal curve. Other components of the sensor electronics 8 and 9 include an auto-zero circuit 68, a clock generator 69. Sangle and hold (8/H) 1. g circuit 70. There is a data strobe circuit 72 and a digital dynode circuit 71.

61 is the main sensor array 6 (e.g. 4
096 channel) for each channel (3rd channel).
This is a digital performance I circuit that corrects the curve (represented by the song @31 in the figure) to look like a straight line 32. 62 similarly connects the data from the sub-sensor array 7 to the straight line 42 in FIG.
It is an arithmetic circuit for vc correction. 63 is straight line 32
This is a linear connection arithmetic circuit that performs digital calculations to create the straight line 51 in FIG. 65
is an interface to a computer or telephone transmission circuit.

In this embodiment, the density data of the X-ray film 10 is collected from one light source 1 at high brightness by the main sensor array system for each channel (for example, 4096 channels), and a characteristic sound like the curve 31 shown in FIG. 3 is generated. Acquired as data. Then, from the same light source 1 through the filter 2 and mirror 3, the reduced brightness is applied to the X-ray film 10 in the sub array system.
Song @4 whose density data is shown in Figure 4 for each channel.
Obtained as data with characteristics like 1. Main sensor array system and sub-sensor array/? Since the array system is deviated by a distance d in the running direction (width scanning direction) of the X-ray film 10, the data obtained from the one-sensor array system is combined to obtain a characteristic like the straight line 51 shown in FIG. Linear connection performance X circuit 63 to obtain data of
Of course, calculations are performed taking this shift into account, and data are combined on the same main scanning line.

〔Effect of the invention〕

As explained above, the present invention can be used to read images on film by combining the outputs from both the center and tear array systems under high illuminance light.

It is possible to read the wide range of blackness that the film has, from near-transparent to 4.0D, which blocks almost all light. Furthermore, since it is possible to obtain a characteristic in which the output varies linearly with the degree of blackening over the entire region, as shown by the straight line 51 in FIG. 5, it is possible to obtain excellent density resolution over the entire region.

Furthermore, of the characteristics of the acquired data of the main sensor array system and the print sensor array system, only the parts that are as close to a straight line as possible as shown in Figures 3 and 4 are used, so the characteristics of each channel of the sensor array are Since parts with little difference can be used, it has the effect of making it difficult to generate the squawking noise that tends to occur in the past.

[Brief explanation of drawings]

FIG. 1 is a side view of an embodiment of the invention. FIG. 2 is a front view of the embodiment shown in FIG. Figure 4 is a graph showing the characteristics of the data of the channels included in the sub-sensor array system in Figure 1, and Figure 5 is the data obtained by correcting and combining the data from the main and sub-sensor arrays. 6 is a diagram showing the main 2 and sub sensor arrays and their data processing, and FIG. 8 is a graph showing the characteristics of the data acquired by the conventional image reading device shown in FIG. 7. Draw a graph. 1.21...Light source % 2...Filter, 3...Mark/mirror, 4...Main sensor array lens, 5...Sub sensor array lens,
6...Sensor array of main sensor array system, 7.
...Sensor array of sub-sensor array system, 8...
...Sensor electronics of main sensor array system, 9
・・・・・・Vice/? Array-based sensor electronics, 10.24...Xi film, 11,25
...Roller, zz...Lens, 23
...Sensor array, 31...Characteristic curve of data acquired from the channel included in the main sensor array system, 32...Right half of curve 31, relatively close to a straight line straight line corrected, 41...Characteristic curve of data acquired from a certain channel of the sub-sensor array system, 42...Processing the left half of curve 41, which is relatively close to the M line Straight line, 51... Line 31
and the straight line obtained by combining W8 with 32, 61-63...
... Arithmetic circuit, 65 ... Interface, 66 ... A/Di converter %67 ... Logarithmic converter, 68 ... ... Auto fi' Qss circuit,
69... Clock generation circuit, 70...
Sample and hold circuit, 71...Digital dynode feedback circuit, 72...Data strobe circuit, 73...Switch. Agent: Patent attorney Susumu Uchihara. Rinto Shinana)eMR Figure 8==◇Fuzurum 1. (filter

Claims (1)

[Claims] A main sensor array system that reads an image with light of high illuminance, a sub-sensor array system that reads the image with light of relatively low illuminance, and an arithmetic circuit that corrects and synthesizes the outputs from the main and sub-sensor array systems. An image reading device comprising: