JPH11164096A - Device and method for reading - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accelerate reading speed while preventing the lack of the quantity of reading light in the case of driving a light source part at high speed by turning two LED light sources in green and blue, blue and red or red and green, defining the quantity of light from an original at that time as the quantity of light respectively mixing green and blue, blue and red or red and green, and calculating the quantity of light in the single color of red, green or blue based on that value. SOLUTION: Concerning a color scanner device 1 of a light source switching type having an LED light source 3 using LED in red, green and blue, the LED in green and blue, blue and red or red and green are turned on, the quantity of light reflected from an original 2 at that time is read by an image sensor as the quantity of light respectively mixing green and blue, blue and red or red and green, and a read control part 5 is provided for calculating the quantity of light in the single color of red, green or blue based on that value. Thus, even when the LED light source 3 is driven at high speed, the quantity of reading light is not reduced so that the color scanner device 1 accelerating the reading speed can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to red, green and blue L
The present invention relates to a reading device and a method for a light source switching type color scanner device having a light source using an ED, and more particularly, to turning on two light sources such as green and blue, blue and red, and red and green, The amount of light reflected from the light source is the combined amount of green and blue, blue and red, and red and green, respectively, and based on the value, single-color light amounts of red, green, and blue are calculated.

[0002]

2. Description of the Related Art In a color scanner apparatus of a light source switching type, LEDs have recently begun to be used as a light source. This stems from the development of blue and green high-brightness LEDs.

Generally, a reading method of a color scanner using an LED as a light source is to turn on a monochromatic light source of red, green, and blue, read the amount of light reflected from a document as it is with a monochrome image sensor, Green and blue color output.

FIG. 4 shows a processing flowchart of a conventional reading control unit. Hereinafter, the operation will be described according to this flow.

Step S401: The red light source is turned on.

Step S402: The amount of light reflected from the original is read as the amount of red light.

Step S403: The green light source is turned on.

Step S404: The amount of reflected light from the original is read as the amount of green light.

Step S405: The blue light source is turned on.

Step S406: The amount of light reflected from the original is read as the amount of blue light.

Step S407: It is determined whether or not data of all originals has been read. If all have been read, the process ends. If all have not been read, the process proceeds to step S408.

Step S408: The original is moved to read the next line. Then, the process returns to step S401.

[0013]

However, in the prior art shown in FIG. 4, these blue and green high-brightness LEDs are still expensive, and when the LEDs are driven at high speed,
There is a problem that the amount of light is small and dark as compared with a discharge tube having the same volume.

[0014]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems. Two LED light sources are lit, such as green and blue, blue and red, and red and green. The amount of reflected light from the original document is the combined light amount of green and blue, blue and red, and red and green, respectively.
The green and blue monochromatic light amounts are calculated. Thus, it is possible to prevent the reading light amount from being insufficient when the light source unit is driven at a high speed, and to increase the reading speed.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a reading device of a color switching device of a light source switching type having a light source using red, green and blue LEDs, light sources of green and blue, blue and red, and red and green are turned on. The read control unit that calculates the monochromatic light amounts of red, green, and blue based on the values of the reflected light amounts from the original document as the combined light amounts of green and blue, blue and red, and red and green, respectively. With this arrangement, it is possible to prevent the reading light amount from being insufficient when the light source unit is driven at a high speed, and to increase the reading speed.

Further, a light source for green and blue, blue and red, and red and green is turned on, and the amount of light reflected from the original at that time is set to the combined light amount of green and blue, blue and red, and red and green, respectively. The reading processing can be further speeded up by providing a reading control unit that performs the processing of calculating the monochromatic light amounts of red, green, and blue based on these values in parallel.

[0017]

FIG. 1 is a block diagram showing the configuration of the present invention. In the figure, 1 is a color scanner device, 2 is a document, 3 is a red, green, and blue LED light source for irradiating the document 2 with light, 4 is an image sensor that reads the amount of light reflected from the document, and 5 is reading of the document 2 It is a reading control unit that performs control such as movement of the position, turning on the LED light source 3, reading data from the image sensor, and transferring the data to the host device.

FIG. 2 is a flowchart showing the operation of the reading control unit according to an embodiment of the present invention. Hereinafter, the operation will be described according to this flow.

Step S201: The red and green light sources are turned on.

Step S202: The amount of light reflected from the original is read as the combined amount of red and green (R + G).

Step S203: The green and blue light sources are turned on.

Step S204: The amount of light reflected from the document is read as the combined amount of green and blue (G + B).

Step S205: The blue and red light sources are turned on.

Step S206: The amount of reflected light from the original is read as the combined amount of blue and red (B + R).

Step S207: The amount of light (R + G) read in steps S201 to S206, (G +
B) and (B + R) are calculated, and the light amounts of red, green and blue of a single color are calculated. In addition, monochromatic red (R), green (G), blue (B)
Is obtained as follows. R = (((R + G) + (G + B) + (B + R)) / 2)
-(G + B) G = (((R + G) + (G + B) + (B + R)) / 2)
− (B + R) B = (((R + G) + (G + B) + (B + R)) / 2)
− (R + G)

Step S208: It is determined whether data of all the originals have been read. If all have been read, the process ends. If all have not been read, the process proceeds to step S209.

Step S209: The original is moved to read the next line. Then, the process returns to step S201.

In this example, the process of reading the amount of reflected light from the original in steps S201 to S206 and the process of calculating the amount of monochromatic light in step S207 are performed in order. However, the reading process is performed by performing these processes in parallel. Can be speeded up.

FIG. 3 is an explanatory diagram of the parallel processing of reading. In the drawing, T1 to Tn indicate reading processing of one line to n lines of the original, d1 of each reading processing is reading processing of the reflected light amount with respect to the red and green light sources in steps S201 to S202 of FIG. Step S20 of 2
From 3 to S204, the process of reading the amount of reflected light for the green and blue light sources is shown. D3 shows the process of reading the amount of reflected light for the blue and red light sources from step S205 to S206 in FIG.

Then, the process of calculating the amount of monochromatic light, that is, FIG.
In step S207, the reading process T1 is completed, and the light amounts of monochromatic red, green, and blue are calculated based on the light amounts read in the reading process T1 at the time of the reading process T2. That is, at the time of the reading process Tn, the immediately preceding reading process T (n
Based on the light amount read in -1), the calculation of the monochromatic light amount is processed in parallel.

[0031]

The present invention is embodied in the form described above, and has the following effects.

Even if the light source unit using the LED is driven at a high speed, the amount of light for reading does not decrease, so that it is possible to provide a color scanner device with a high reading speed.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of the present invention.

FIG. 2 is a processing flowchart of a reading control unit according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram of parallel processing of reading.

FIG. 4 is a processing flowchart of a conventional reading control unit.

[Explanation of symbols]

 5 Read control unit

Claims (3)

[Claims] 1. A reading device in a color switching device of a light source switching type having a light source using red, green, and blue LEDs, wherein light sources of green and blue, blue and red, and red and green are turned on, and a document at that time is turned on. The reading control unit (5) that calculates the amount of monochromatic light of red, green, and blue based on the value of the amount of light reflected from the unit as the combined amount of green and blue, blue and red, and red and green. A reading device comprising: 2. A process of turning on the light sources of green and blue, blue and red, and red and green, and setting the amount of reflected light from the original at that time to the combined amount of green and blue, blue and red, and red and green, respectively. 2. The reading apparatus according to claim 1, further comprising a reading control unit configured to perform a process of calculating monochromatic light amounts of red, green, and blue by calculation based on the values in a parallel process. 3. A reading method in a light source switching type color scanner device having a light source using red, green, and blue LEDs, wherein a light source for green and blue, blue and red, and red and green is turned on, and a document at that time is turned on. The amount of light reflected from the device is defined as the combined amount of green and blue, blue and red, and red and green, and based on that value, the calculation of the monochromatic amounts of red, green, and blue is performed. Method.