JPH08317192A - Color image reader - Google Patents

Abstract

PURPOSE: To save the power consumption of a light source by designating a color not lighted among red, green, blue colors and a read range of an original and controlling a light emitting diode array other than that of a designated color in the horizontal and vertical scanning directions in the designated range to be lighted. CONSTITUTION: A dropout color designation means 12 designates a dropout color and a read range designation means 11 designates a read range before reading an original, then a CPU 10 stores a designated color and the designated range to a memory. Then the CPU 10 drives a motor 22 via a motor control section 23 to move an optical unit in the vertical scanning direction thereby controlling a light emitting diode array 13 via a light source control section 14. The one-color or 2-color diode array 13 other than the designated light is lighted by a length of the designated range is the horizontal and vertical scanning directions by this control. Thus, the array 13 in the designated color is not lighted and the array 13 for a required range is lighted, then the power consumption required for a light source is saved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image reading apparatus for illuminating a document by lighting light emitting diode arrays of three colors of red, green and blue, and reading an image on the document by an image sensor, such as a color scanner or a color scanner. It is applied to color copiers and color facsimiles. More specifically, it relates to designation of a reading range and a dropout color in such a color image reading device.

[0002]

2. Description of the Related Art In a conventional color image reading apparatus, after a reading range of an original is designated on a platen, a light emitting diode is turned on at the same time when the reading of the original is started to move the original in the sub-scanning direction while illuminating the original. , Regardless of the size of the document (especially the length in the main scanning direction) or the starting point in the sub-scanning direction based on the specified reading range, the light-emitting diode array must be fully illuminated (light-emitting diode array) at a specific starting point in the sub-scanning direction All light emitting diodes in the array are lit). Therefore, the light is turned on even outside the image range to be read, resulting in unnecessary power consumption.

Further, in Japanese Patent Laid-Open No. 4-160863, an instruction means for selectively instructing a type of color component so that an image pickup system of a color component other than a dropout color can be selected when reading a monochrome image. There is disclosed a color image reading apparatus including: a selection unit that selects, as a monochrome image, a reading result of an imaging system corresponding to the color component designated by the designation unit. However, according to this, only one color of dropout can be specified in one frame by one scan, and it is also impossible to partially perform dropout color processing on an arbitrary part of the document.

[0004]

SUMMARY OF THE INVENTION A first object of the present invention is to lighten a light emitting diode array only in a portion corresponding to a designated reading range on an original so that power consumption can be saved. is there. A second object of the present invention is to enable dropout color processing of an arbitrary color for each of one or more reading ranges designated in one frame.

[0005]

In order to achieve the first object, in a color image reading apparatus according to the present invention, a reading range designating means for designating a reading range on a document and a reading range designating means are designated. And a light source control means for turning on the light emitting diode array only for the length of the reading range in the main scanning direction. The light source control means can turn on the light emitting diode array only in the range in the main scanning direction and the range in the sub scanning direction designated by the reading range designating means while the optical unit is moving.

In order to achieve the first and second objects, in the color image reading apparatus according to the present invention, a dropout color designating means for designating a color to be dropped out among three colors of red, green and blue, and a document. Only the reading range designating means for designating the upper reading range and the range in the main scanning direction and the sub-scanning direction of the reading range designated by the reading range designating means,
The light emitting diode array other than the light emitting diode array of the color designated by the dropout color designating means is turned on.

[0007]

According to the present invention, the light emitting diode array lights up only in the reading range designated by the reading range designating means. When a dropout color is designated for each designated reading range, the light emitting diode arrays of the dropout designated color do not light up in that range, and only the light emitting diode arrays of other colors light up.

[0008]

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

FIG. 1 shows the electrical construction of a color image reading apparatus according to an embodiment of the present invention. This color image reading device
A CPU 10 that performs overall control and arithmetic processing, a reading range designating unit 11 that designates a reading range, and a dropout that arbitrarily designates one or two colors to be dropped out among three colors of red, green, and blue. A color designating means 12, a light emitting diode array 13 of three colors of red, green and blue, a light source control section 14 for controlling these light emitting diode arrays 13 according to a command from the CPU 10, a CCD sensor (image sensor) 15 and an original document. The lens 17 for forming an image on the CCD sensor 15 by the reflection from 16 and the CCD sensor 15
, An analog processing section 19 for analog processing of the amplified output, an A / D conversion section 20 for converting the output after analog processing into a digital value, and three-color processing after digital conversion. A digital processing unit 21 for converting the digital image data into a composite image, a motor 22 for moving an optical unit including the three-color light emitting diode array 13, the lens 17, the CCD sensor 15, and the like, and the motor 22 according to a command from the CPU 10. And a motor control unit 23 for controlling.

Next, with the configuration of FIG. 1, the document is read 3
One reading example will be described. In the first example, the dropout color designating unit 12 does not designate any color to be dropped out, but the reading range designating unit 11 designates the reading range before reading the original. In FIG. 2, the document table 24
When the original 16 is placed on the upper side, the original 16 is fixed by the pressing plate 25, and the reading range is designated by the reading range designating means 11,
The length of each of the main scanning direction and the sub scanning direction is the CPU 10.
Stored in memory. Therefore, when the motor 22 is driven to move the optical unit in the sub-scanning direction, the light-emitting diode array 13 for the three colors causes the range in the main-scanning direction based on the length information in the main-scanning direction stored in the memory. Only the portion 26 is turned on from the start point 27 in the sub-scanning direction, and is turned off when the end point 28 in the sub-scanning direction is reached.

In the second example, the drop-out color designating means 12 does not designate any color to be dropped out, but the reading range designating means 11 designates a part of the image to be extracted after the original is read. In FIG. 3, after reading the original 16, the range of a part of the image 29 to be extracted is designated by the reading range designating means 11 and the optical unit is moved, so that the light emitting diode array 13 of three colors is turned on at the same time as the movement is started. Only when the reading start point 30 in the sub-scanning direction is reached, only the part of the reading range 31 in the main scanning direction is turned on. Then, when the end point 32 in the sub-scanning direction is reached, the light is turned off.

In the third example, the dropout color designating means 12 designates the color to be dropped out, and the reading range designating means 11 designates the reading range before reading the original. In FIG. 4, after placing the original 16 on the original table 24 and fixing the original 16 with the pressing plate 25, the dropout color designating unit 12 designates the color to be dropped out, and the reading range designating unit 11 reads the reading range 33. Is specified, the color to be dropped out and the lengths in the main scanning direction and the sub scanning direction are stored in the memory of the CPU 10. Therefore, when the motor 22 is driven to move the optical unit in the sub-scanning direction, the light emitting diode array 13 of a color other than the drop-up color stored in the memory becomes
Based on the length information in the main scanning direction stored in the memory, only the portion 34 in the main scanning direction is turned on from the start point 35 in the sub scanning direction and turned off at the end point 36. When a plurality of reading ranges are specified for one document, the same operation as above is performed for each reading range.

[0013]

According to the invention of claim 1, the light emitting diode array is not fully illuminated in the main scanning direction,
Since the light can be turned on for the length in the main scanning direction required for the reading range and turned off immediately after the reading in the sub scanning direction is completed, the power consumption required for the light source can be reduced.

According to the second aspect of the present invention, the light emitting diode array is not turned on in the main scanning direction, but is turned on for the length in the main scanning direction and the length in the sub scanning direction required for the reading range. Therefore, the power consumption can be further reduced as compared with the first aspect.

According to the third aspect of the invention, the light emitting diode array of the dropout designated color is not lit in the designated reading range, and only the light emitting diode arrays of other colors are lit, so that power consumption is saved. While you can
It is possible to perform the dropout color process for any one color of 1 or 2 for each of one or more designated reading ranges in the same original.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a color image reading device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a reading example in which a reading range is designated before reading a document without designating any color to be dropped out.

FIG. 3 is a perspective view showing a reading example in which a part of an image to be extracted after a document is read is designated without designating a color to be dropped out.

FIG. 4 is a perspective view showing a reading example in which a color to be dropped out is designated and a reading range is designated before reading a document.

[Explanation of symbols]

 10 CPU 11 Reading Range Designating Means 12 Dropout Color Designating Means 13 Light Emitting Diode Array 14 Light Source Control Section 15 CCD Sensor (Image Sensor) 16 Original 17 Lens 18 Amplifier 19 Analog Processing Section 20 A / D Conversion Section 21 Digital Processing Section 22 Motor 23 Motor control unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location H04N 1/48 H04N 1/46 A

Claims (3)

[Claims] 1. A color image reading apparatus for illuminating a document by lighting light-emitting diode arrays of three colors of red, green and blue, and reading an image on the document by an image sensor, to specify a reading range on the document. A color image reading apparatus comprising: a reading range designating means; and a light source control means for turning on the light emitting diode array by a length of the reading range designated by the reading range designating means in the main scanning direction. . 2. A color image reading apparatus for reading an image on a document by an image sensor while illuminating a document by lighting light-emitting diode arrays of three colors of red, green and blue, and moving the optical unit. Reading range designating means for designating a reading range and a light source control for turning on the light emitting diode array only in the main scanning direction range and the sub scanning direction range designated by the reading range designating means while the optical unit is moving. And a color image reading device. 3. A color image reading apparatus for illuminating a document by lighting light emitting diode arrays of three colors of red, green and blue, and reading an image on the document with an image sensor,
Dropout color designating means for designating a color to be dropped out among three colors of red, green and blue, reading range designating means for designating a reading range on the original, and reading designated by the reading range designating means. Light source control means for turning on the light emitting diode arrays other than the light emitting diode array of the color designated by the dropout color designating means only for the range in the main scanning direction and the sub-scanning direction. Color image reader.