JPH02250560A - Color picture reading device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of color distortions by obtaining the output corresponding to the spectral characteristics of a color filter set opposite to each photoelectric transducer set on the same line rectangular to the direction of each train of photoelectric transducing parts for each area of a color picture. CONSTITUTION:The photoelectric conversion part 4 undergoes the main scan in the directions of their trains 1-3 and at the same time are moved in the directions rectangular to the directions of trains 1-3 as the secondary scan against a color original 9 to be read. Then the output signals corresponding to the spectral characteristics of the color filters, i.e., the output signals related to the R(red), G(green) and B(blue) color filters 11-13 are all separated from each photoelectric transducer 10 set on the same line rectangular to their passing trains 1-3 for each area of the original 9. As a result, the occurrence of the color distortions including a moire phenomenon can be prevented.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a color image reading device that performs color separation of a color original using a photoelectric conversion section including a photoelectric conversion element and filters for each of the three primary colors of light.

[Conventional technology]

In the conventional device proposed in Japanese Patent Application Laid-Open No. 60-217660, as shown in FIG.
A plurality of . each second column 21.2
2 are arranged in two stages perpendicular to the column direction to form a photoelectric conversion unit. Next, on the incident light side of each photoelectric conversion element 10 in the first row 21, red (R), which is the three primary colors of light,
Color filters 11 and 12 corresponding to green (G) and blue (B)
．． 13 (hereinafter simply referred to as R, G, and B) are repeatedly provided in that order. Each photoelectric conversion element 1 in the second row 22
0 in the same order as the first column 21.
Each color filter is shifted by 5 photoelectric conversion elements 11.12.1
3 will be provided. In other words, the midpoint of the first column 210G and the second
When connecting the midpoints of columns 220B and 220H, an equilateral triangle is formed. In this conventional device, the first. When the color document is moved in a direction perpendicular to each of the second columns 21 and 22, the portion of the document corresponds to all of the filters of each color, so that desired color image information is always output. That is, when reading a color image, it is possible to prevent moiré and other color distortions from occurring.

[Problem to be solved by the invention]

In the conventional technology as described above, when a color original has red stripes 20, for example, as shown in FIG. 4, the stripes 20 are first . Assuming the positional relationship as shown in the figure for each of the second columns 21 and 22, one of the three color filters, B, does not have any stripes 20, so the read color image information There is a problem in that color distortion occurs, making accurate reading impossible. SUMMARY OF THE INVENTION An object of the present invention is to provide a color image reading device that solves the problems of the conventional technology and completely prevents the occurrence of moiré and other color distortions.

[Means to solve the problem]

In order to solve this problem, the color image reading device according to the present invention includes a photoelectric conversion device in which three of the rows of a plurality of photoelectric conversion elements arranged in parallel are arranged perpendicularly to the direction of each row. a conversion element unit; each of the photoelectric conversion elements such that a set of each of the three primary colors of light is repeated in the direction of each row, and all of the colors are included in a direction perpendicular to the direction of each row; a color filter provided on the incident light side of the color image; and a photoelectric conversion unit that is moved perpendicularly to the direction of each of the columns with respect to the color image to be read; Outputs corresponding to the spectral characteristics of the corresponding color filters are obtained from each of the photoelectric conversion elements on the same line perpendicular to the direction.

[For use]

With respect to the color image to be read, the photoelectric conversion unit is main-scanned in the direction of each column, and is also moved perpendicularly to the direction of each column in sub-scanning, passing through this at each location on the color image. Output signals corresponding to the spectral characteristics of the corresponding color filters from each photoelectric conversion element on the same line perpendicular to each column, that is, all output signals related to the R, G, and B color filters are obtained by color separation. .

【Example】

Embodiments of a color image reading device according to the present invention will be described below with reference to the drawings. FIG. 2 is a schematic diagram of the photoelectric conversion section in this embodiment. In FIG. 2, photoelectric conversion elements 10 schematically shown as squares are arranged in parallel across the width of a color original to be described later. Second. Each of the third columns constitutes 1°2.3, which are arranged in three stages perpendicular to the direction of the columns, and constitute photoelectric conversion element units (not shown). On the incident light side of each photoelectric conversion element 10, color filters 11, 12, and 13 of the three primary colors of light, red, green, and blue, are arranged in the order described below.
is provided and constitutes the photoelectric conversion section 4 in the invention. For the direction of each column, each set of colors, R, G, B, is repeated in that order (not necessarily in this order), and for the direction perpendicular to the direction of each column, all of each color, R, G,
In other words, the second row 2 is one photoelectric conversion element to the left with respect to the first row 1, and the third row 3 is one photoelectric conversion element to the left with respect to the second row 2. They are arranged to be shifted from each other by the number of conversion elements. FIG. 1 is a schematic diagram showing the configuration of the main parts of this embodiment. In FIG. 1, numeral 4 is the photoelectric conversion section mentioned above, 5 is a signal processing section, 6, 7.8 are image memories related to R2O and B, respectively, and 9 is a color original to be read. The signal processing section 5 is the first. The output signal corresponding to the spectral characteristics of the corresponding color filter, which is output from each photoelectric conversion element 1 (see Fig. 2) belonging to each of the second and third columns 1, 2, and 3, is transmitted to the first column. Second. Each third column 1.2.3 is independently processed in parallel for color separation. R, G, B image memory 6°7.8
stores the output signal from the signal processing unit 5 in correspondence to each location on the color original 9 for each color. Now, the width of the photoelectric conversion unit 4 corresponds to the width of the color original 9, and the color original 9 is sent in the direction of arrow Y. The direction of arrow X is the main scanning direction, and the direction of arrow Y is the sub-scanning direction. In other words, for each main scan, the 1st, 2nd, . One sub-scan for each third column corresponds. At a point P on the color original 9, an output signal (hereinafter referred to as an R signal) corresponding to the spectral characteristics of R is obtained by the R in the first column 1, and a G signal is similarly obtained by the G in the second column 2. 3rd row 3
A B signal is obtained by B of . The R, G, and B signals regarding the point P on the color original 9 are color-separated by the signal processing unit 5, and are stored in the image memory 6° 7.8 at the position corresponding to the point P for each color R, G, and B. Stored. Similarly, for each location on the color original 9, the R, G, and B signals are all color separated by the photoelectric conversion unit 4 and stored in the corresponding image memory 6.7.8. There is no risk that only the color of the image will be emphasized or weakened. Therefore, when reading the color image information on the color original 9, it is possible to completely prevent the occurrence of moire phenomenon and other color distortions.

【Effect of the invention】

As explained above, in the present invention, the photoelectric conversion unit is main-scanned in the direction of each column with respect to a color image to be read, and is also moved perpendicular to the direction of each column as a sub-scan, so that the color image can be read. For each location above, output signals corresponding to the spectral characteristics of the corresponding color filters from each photoelectric conversion element on the same line perpendicular to each column passing through the locations, that is, output signals related to each color filter of RlG and B. are determined by color separation. Therefore, the present invention has the superior effect of completely preventing the occurrence of moiré phenomena and other color distortions as compared to conventional techniques.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the configuration of the main part of an embodiment according to the present invention, FIG. 2 is a schematic diagram of a photoelectric conversion section in this embodiment, and FIG.
The figure is a schematic diagram of the photoelectric conversion section of the conventional device, and FIG. 4 is a schematic diagram showing the operational drawbacks of this conventional device. 9: Color original, 10: Photoelectric conversion element, 11: Red filter, 12: Green filter, 13: Blue filter.

Claims (1)

[Claims] 1) 3 rows of multiple photoelectric conversion elements arranged in a straight line
a photoelectric conversion element unit in which the photoelectric conversion element units are arranged perpendicularly to the direction of each row; in the direction of each row, each set of the three primary colors of light is repeated, and in the direction perpendicular to the direction of each row; a color filter provided on the incident light side of each of the photoelectric conversion elements so that all of the respective colors are included; and an output corresponding to a spectral characteristic of a corresponding color filter is obtained from each of the photoelectric conversion elements on the same line perpendicular to the direction of each column for each location of the color image. color image reading device.