JPS59189775A - Method and device for reading color picture - Google Patents

Abstract

PURPOSE:To read a color picture in a high speed without restrictions due to the characteristics of a selected light source, by keeping one of plural light sources, which are different in spectral characteristics from one another, lit during the overall read scanning time of an original and flickering another light source. CONSTITUTION:A blue fluorescent lamp 1 having a short afterglow time is flickered repeatedly synchronously with the original read scanning period due to an image sensor 4 by a scanning start signal SS from an image sensor driving circuit 40. Meanwhile, a red fluorescent lamp 2 is kept lit during the overall read scanning time of an original MS by a drive signal DS. Thus, the irradiation of light due to only a red light signal RC and the irradiation of light due to the signal RC and a blue light signal BC are repeated alternately for the picture surface of the original MS, and the image sensor 4 reads and scans each read object line twice on a basis of said two kinds of irradiation of light. A color discriminating circuit 50 applies a photoelectric conversion signal, which is outputted from the image sensor 4, to an A/D converting circuit 51 to obtain a coded photoelectric conversion signal DCE corresponding to the ratio level, and color information is read out from a memory 54.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color image reading method and apparatus for photoelectrically reading a color image of a document used in facsimiles and the like.

[Prior art]

A method that has attracted attention in recent years as a method for photoelectrically reading color images of originals is a method that uses multiple light sources with different spectral characteristics to flash each light source in sequence in synchronization with the original reading scan cycle of an image sensor. By sequentially focusing the light on an image sensor, a plurality of types of photoelectric conversion signals corresponding to the number of light sources are obtained for the same scanning line of the document, and then, based on the levels of these photoelectric conversion signals, There is a method of determining the image color in the scanning line of the original that has been read and scanned. This color image reading method will be specifically explained below with reference to FIGS. 1 to 3.

Here, as an example, we will use two fluorescent lamps, a blue fluorescent lamp and a red fluorescent lamp, as the light sources to read three types of color images: "blue,""red," and "black." and shows the device.

That is, in FIG. 1, 1 is a blue fluorescent lamp and 2 is a red fluorescent lamp. When these fluorescent lamps are turned on by a lighting circuit (not shown), a blue light signal BC is emitted from the blue fluorescent lamp 1. , and a red light signal RC is emitted from the red fluorescent lamp 2 so as to illuminate the same portion (line) of the document MS. Further, the reflected light from the original MS is imaged by a lens 3 on an image sensor 4 consisting of, for example, a charge-coupled daylight sensor (COD), and the image sensor 4 generates an electrical signal having an electrical level corresponding to the amount of light. (Photoelectric conversion signal CE).

Note that, as the phosphor of the blue fluorescent lamp 1, for example, calcium tungstate is used, and as the phosphor of the red fluorescent lamp 2, for example, magnesium germanate is used.

The spectral characteristics of the blue fluorescent lamp 1 and the red fluorescent lamp 20 are shown in FIG.

Now, in this color image reading method, when reading the above-mentioned color image of the original MS, the blue fluorescent lamp 1 and the red fluorescent lamp 2 are synchronized with the reading scanning cycle of the image sensor 4 and the feeding of the original MS. the original M.
The same line of S is read and scanned twice: when the blue light signal BC is irradiated and when the red light signal RC is irradiated.

FIG. 3 is a timing chart showing this driving mode, and FIG.
3(C) shows the generation mode of the red light signal RC, that is, the blinking mode of the red fluorescent lamp 2, and FIG. 3(d) shows the same reading scanning. The mode of the photoelectric conversion signal C''E correspondingly outputted from the image sensor 4 is, in particular, an image in which the first line of the original MS read and scanned by the image sensor 4 is blue (
The image shows the changes in the case where the second line is red and the second line is red (line).

That is, suppose that the first line is all blue and the second line is all black, and during the first scan (time t1 to time t2) of the first line of the document MS, as shown in FIG. 3(b), If the blue light signal Be is irradiated to
The electric charge corresponding to the reflected light) is detected by the image sensor (C
CD line sensor) 4, and in the next scanning period (time t2 to time ts), this accumulated charge is output from the image sensor 4 as a photoelectric conversion signal eE (third
(See figure (d)). In addition, during the scanning period from time t2 to time t3, that is, the second scanning period for the first line of the original tS, the blue light signal Bc − When the IR beam disappears and a red light signal Re is irradiated instead, the red light signal RC at this time is almost absorbed by the blue image of the first line of the original (see FIG. 2).

Therefore, the reflected light at this time is small, and the photoelectric conversion signal CE output from the image sensor 4 in the next scanning period (time t3 to time t4) also has a small stress as shown in FIG. 3(d). Become. Furthermore, in the scanning period for the second line of the same document MS (from time t4 to time t5 and from time t5 to time ta), this second line is completely red, so the photoelectric conversion signal C under the same irradiation conditions as above.
The output mode of E is also exactly the opposite due to the above-mentioned reason (see FIG. 3(d)). Although not shown in FIG. 3, when the image sensor 4 scans the entire white line of the document MS, even under the above irradiation conditions, two scans are performed. Almost 100%
Since reflected light is obtained, the photoelectric conversion signal CE is also 2
If the same reading scanning is performed on all black lines of the original MS, the blue light signal BC Since both the red light signal Re and the red light signal Re are absorbed by this black image, the photoelectric conversion signal CE at this time becomes a signal of a small level over two scanning times.

In the color discrimination circuit 5 shown in FIG. 1, the level of the photoelectric conversion signal CF described above is determined, and the image color of the scanned document MS is sequentially determined based on, for example, a combination of the change modes thereof.

[Problems with conventional technology]

As mentioned above, if a color image reading method is adopted in which multiple light sources with different spectral characteristics are sequentially blinked, the configuration of the optical system in the device will certainly be simplified and the reading accuracy will be improved, but on the other hand, Inconveniences also arise, such as the reading speed being limited by the blinking response characteristics of the light source itself.

For example, in the case of the above-mentioned example, a red-emitting phosphor (for example, magnesium dallmanate) used in the red fluorescent lamp 2
generally has poor blinking response characteristics and a long afterglow time (approximately 2 m5ec) compared to the blue-emitting phosphor (for example, calcium tungstate) used in the blue fluorescent lamp 1.

Therefore, when the red fluorescent lamp 2 is blinked, the red light signal RC becomes a light signal with a slow response as shown in FIG. 3(C), especially at time t in the same timing chart.
3 to time t4. and afterglow time from time t6 to time t7 (
The above-described reading scan cannot be performed during the period shown in the shaded area in the figure. Conventionally, various countermeasures have been taken to prevent this, such as making the above-mentioned afterglow time period the period for feeding the document MS, but the fact remains that the document reading speed is essentially limited, and in the end the same method is used. The application of this to high-speed aircraft was in doubt.

[Object of the Invention] The present invention solves the above-mentioned drawbacks of the method of reading color images based on the blinking of a plurality of light sources with different spectral characteristics, and enables high-speed document reading regardless of the characteristics of the light source. An object of the present invention is to provide a color image reading method and apparatus that can perform color image reading.

[Structure of the invention]

In this invention, the same part of the original is irradiated with light a plurality of times corresponding to the number of light sources at a period corresponding to the scanning period of reading the original by the image sensor. When obtaining multiple types of photoelectric conversion signals corresponding to the above image, at least one of the light sources is kept lit during the entire reading scan period of the document, and at least one thin light source is turned on during the lighting period of the same light source. It is made to blink at a period corresponding to the document reading scanning period by the sensor. The photoelectric conversion signal obtained in this way is such that when the image color of the scanned portion of the document corresponds to one of the emission colors of the at least two types of light sources mentioned above, the at least two types of light sources are turned on at the same time. The level corresponding to the amount of reflected light of about 50 is shown only during the period corresponding to the period in which the original image is displayed. Colors are effectively determined based on the electrical level of the photoelectric conversion signal.

Therefore, if a light source with poor blinking response characteristics, that is, a long afterglow time, is selected as the light source for keeping the light on, and a light source with good blinking response characteristics, that is, a short afterglow time, is selected as the light source for blinking, the original Reading speeds are also increasingly limited by the blink response characteristics of these light sources.

〔Example〕

FIG. 4 shows an embodiment of a color image reading device according to the present invention. However, in this example, as well as the apparatus shown in FIG.
It is assumed that three types of color images are to be read: , "red", and "black".

That is, in FIG. 4, blue fluorescent lamp 1 and red fluorescent lamp 2
Assume that these are similar to those shown in FIG. 1 above, and that their spectral characteristics are also the same as shown in FIG. 2 above.

i! Circle, lighting circuit 12 (not shown in Figure 1)
When the blue fluorescent lamp 1 is turned on by driving, a blue light signal BC is sent to the lighting circuit 22 (not shown in FIG. 1).
When the red fluorescent lamp 2 is turned on by the drive of An image is formed on an image sensor 4 consisting of a line sensor, and the image sensor 4
Similarly to the case of the apparatus shown in FIG. 1 above, the light is converted into an electric signal (photoelectric conversion signal cg) having an electric level corresponding to the amount of light.

However, the driving of the lighting circuit 12 is controlled by the lighting control section 11, and the driving of the lighting circuit 22 is controlled by the lighting control section 21. Of these, the lighting control section 11
is a scan start signal S outputted from the image sensor drive circuit 40 to the vagina where the image sensor drive circuit 40 instructs the image sensor 4 to start reading scan for each line.
Based on S, the driving mode of the lighting circuit 12 is controlled so that the blue fluorescent lamp 1 repeats blinking in synchronization with the scan period of document reading by the image sensor 4. , for example, is at an active level in a trench where the entire reading of the original MS is completed after the original reading start button (not shown) is operated, and indicates that at least the start button has been operated and that all reading of the original MS has been completed. Based on the possible drive signal DS, the driving mode of the lighting circuit 22 is controlled so that the red fluorescent lamp 2 is kept lit during the entire reading scan period of the document MS. Note that the image sensor drive circuit 40 receives the drive signal D.
The well-known method provides the above-mentioned scan start signal SS and the image signal clock CLK corresponding to the image signal bits in one scanning line to the image sensor 4 based on the signal S, and substantially controls the document reading and scanning operation by the image sensor 4. This is the circuit.

By using such a device, when reading the image of the original MS, the image surface of the original MS is irradiated with light using only the red light signal RC, or the red light signal RC and the blue light signal BC are used. The light irradiation by the mixed light is alternately repeated in synchronization with the reading scanning period of the image sensor 4. In the image sensor 4, two reading scans are performed for each line to be read of the original MS based on the above two types of light irradiation.

FIG. 5 is a timing chart showing this driving mode, and the color image reading operation in this embodiment will be explained below with reference to this timing chart. However, the same 5th
In the figure, FIG. 5 (,) shows the image sensor 4 described above.
5(b) shows how the blue light signal BC is generated, and FIG. 5(c) shows how the red light signal R is generated.
FIG. 5(d) shows the form of the photoelectric conversion signal CF output from the image sensor 4 in response to the reading scan. The first line of the document M'S is an all-white image (line), the second line is an all-black image (line), the third line is an all-blue image (line), Each shows a change mode when the fourth line is an entirely red image (line).

That is, the first scan of the first line of the document MS, assuming that the first line is all white, the second line is all black, the third line is all blue, and the fourth line is all red (
From time t1 to time tz), FIGS. 5(b) and (c)
Assuming that a mixed light of a blue light signal BC and a red light signal RC (light blue light, but can be approximately considered white light in this example) is irradiated as shown in FIG. Charges corresponding to the reflected light (100% reflected light) at this time are accumulated in the image sensor 4, and in the next scanning period (time t2 to time ts), the accumulated charges are used as the photoelectric conversion signal CE for the image sensor 4. It is output from the sensor 4 (see FIG. 5(d)).

Furthermore, during the scanning period from time t2 to time t3, that is, the second scanning period for the first line of the original MS, the blue light signal BC is transmitted as shown in FIGS. 5(b) and 5(e). The line disappears and only the red light signal RC is irradiated, but since the line is completely white, the charge corresponding to the 100 lines of reflected light is accumulated in the image sensor 4 even during this scanning time, and the charge is accumulated in the image sensor 4 during the next scanning period ( Time t8 to time t
4) This accumulated charge is output from the image sensor 4 as a photoelectric conversion signal CF (see Fig. 5(d)).
. In other words, if the scanning line is completely white, the photoelectric conversion signal CE will also be 10% over the scanning time of 2 times.
This results in a signal with a high level corresponding to the 0-ch reflected light. Furthermore, the scanning period for the second line of the same document MS (time t3
~ time t4 and time t4 ~ time ts), since this second line is entirely black, even if the light irradiating this image is the above mixed light, the red light signal RC
However, the photoelectric conversion signal CE is absorbed at the same time, and in the end, the photoelectric conversion signal CE at this time becomes a signal with a slight level over two scanning times, contrary to the time when the first line is read. Next, in the first scan (from time t5 to time 16) of the third line of the same document MS, which is assumed to be entirely blue, the above-mentioned mixed light is irradiated. In this case, from the blue image, about 50 inches of reflected light (about half of the 100% reflected light mentioned above) is obtained.
Hereinafter, for convenience, this is called 50-column reflected light, and a charge corresponding to this amount of light is accumulated in the image sensor 4. This accumulated charge becomes a photoelectric conversion signal CE having an intermediate level in the next scanning period (time t6 to time ty).
is output from the image sensor 4 as (Fig. 5(d))
reference). In addition, only the red light signal Re is irradiated during the scanning period from time t6 to time t7, that is, the second scanning period for the third line of the original MS, but since the line is entirely blue, Most of this irradiation light is absorbed (see Figure 2), and eventually the photoelectric conversion signal C
E is at a slight level. In other words, if the scanning line is entirely blue and light is irradiated in the order of "mixed light of blue light signal BC and red light signal RC" → "red light signal RC only", the photoelectric conversion signal As shown in Figure 5(d), CE has a period corresponding to the first scanning cycle of 50%.
The intermediate level corresponding to the reflected light is □, and the period corresponding to the second scanning cycle is a slight level. Next, when the above-mentioned mixed light is irradiated during the first scan (time t7 to time ts) of the fourth line of the same document MS, which is assumed to be entirely red, the first scan of the third line Similarly to the scanning (from time t6 to time ta), 50 degrees of reflected light is obtained from the red image, and charges corresponding to this amount of light are accumulated in the image sensor 4. This accumulated charge also has a photoelectric conversion signal CE which has an intermediate level in the next scanning period (time t8 to time to).
It is output from the image sensor 4 as . Furthermore, the scanning period from time t8 to time t9, that is, the same original M
In the second scanning period for the fourth line S, only the red light signal RC is irradiated. In this case, of course, 100q6 reflected lights are obtained, so in the next scanning period (time t9 to time t1o), a photoelectric conversion signal CF of a high level corresponding to this 100q6 reflected light is output from the image sensor 4. That is, if the scan line is all red and "
When light irradiation is performed in the order of "mixed light of blue light signal BC and red light signal RC" → "red light signal RC only", the photoelectric conversion signal CE is as shown in FIG. 5(d). The period corresponding to the first scanning cycle is an intermediate level corresponding to 50q6 reflected light, and the period corresponding to the second scanning cycle is a high level corresponding to 100% reflected light.

In this way, the photoelectric conversion signal C obtained by the same example
E takes on the above-mentioned specific characteristic form corresponding to the image color of the read image.

When the correspondence relationship between the form of this photoelectric conversion signal CE and the image color of the read image is graphed, a color distribution diagram as shown in FIG. 6 is obtained.

That is, in FIG. 6, the abscissa represents the ratio level of the photoelectric conversion signal CF when irradiated with the "mixed light of the blue light signal Be and the red light signal RC", and the ordinate represents the "red light signal R".
The area where these two ratio levels intersect represents the image color of the read image. For example, the photoelectric conversion signal CEO ratio level (abscissa) when irradiated with the above-mentioned "mixed light" is 50, and the ratio of the photoelectric conversion signal CE when light is irradiated with the above-mentioned "red light signal RC only". When the level (ordinate) is 100 (corresponding to point A in the figure), this image color cannot be anything other than "red". Of course, this result coincides with the result from time t8 to time tlO in FIG. 5(d). This is the same as the photoelectric conversion signal CEO ratio level when irradiated with the above-mentioned "mixed light" and the above-mentioned "red light signal RC only".
If the ratio level of the photoelectric conversion signal cE when irradiated with light can be determined by
``Red'', ``Black'') are all clearly distinguishable.

An example of this electrical processing method will be explained with reference to FIG. 4 again.

A photoelectric conversion signal CE output from the image sensor 4 is input to a width (analog/digital) conversion circuit 51 . The φ conversion circuit 51 is connected to the image sensor drive circuit 40.
This is a well-known circuit that determines the level of an input analog signal in synchronization with the image signal clock CLK output from the photoelectric conversion signal CE, and forms a digital signal indicating a value corresponding to the relative analog level of this signal. is a digital signal (hereinafter referred to as an encoded photoelectric conversion signal DCE) indicating a value corresponding to the ratio level described above through this horizontal conversion circuit 51.
).

This encoded photoelectric conversion signal DCE is then sent to the switch circuit 52.
is input. The switch circuit 52 is a circuit that distributes input signals in synchronization with the document reading scan period by the image sensor 4 based on the scan start signal SS output from the image sensor drive circuit 40, and here, the above-mentioned reference numerals are used. Of the encoded photoelectric conversion signals DCE, an encoded signal of the nine-nine electric conversion signal CE (hereinafter referred to as the first encoded photoelectric conversion signal DCE 1) is formed corresponding to the above-mentioned first scanning period for the same reading line. Same switch circuit 5
The encoded signal of the photoelectric conversion signal CE is distributed to the output terminal Tl side of 2 and added to the line memory 53, and also formed corresponding to the second scanning period described above (hereinafter referred to as the second encoded photoelectric conversion signal). The signal DCE 2) is distributed to the output terminal T2 side of the switch circuit 52 and sent to the ROM (
It is assumed that the color information is directly added to the color information memory 54 consisting of a read-only memory (read-only memory). Here, the line memory 53 is a memory having a capacity corresponding to the number of pixels for one running line), and the first encoded photoelectric conversion signal DCE1 added to this line memory 53 is applied to each pixel. The corresponding signals are sequentially shifted and added to the color information memory 54 after being delayed by exactly -scanning period. That is, manuscript M
The first encoded photoelectric conversion signal DCE1 and the second encoded photoelectric conversion signal DCE2 regarding the same reading line of S are simultaneously stored in the color information memory 5 for each signal corresponding to the same image sequence.
Added to 4.

The color information memory 54 stores coded white information WT indicating "white" and coded black information BK1 "blue" indicating "black" based on the color distribution shown in FIG. 6, for example.
The first encoded photoelectric conversion signal DCE 1 and the second encoded photoelectric conversion signal DCE 2 added above are stored in a memory in which encoded blue information BU indicating "red" and encoded red information RD indicating "red" are respectively stored in advance. The above encoded color information WT, BK, BtJ and R are used as address signals.
It operates to sequentially read out the corresponding one of D. In the example described above, the address of the color information memory 54 corresponding to point A in FIG. 6, that is, the value indicated by the first encoded photoelectric conversion signal DCE 1 is "50".
Encoded red information RD indicating "red" is stored in advance at an address designated by an address signal such that the value indicated by the second encoded photoelectric conversion signal DCE2 is r 100 J. When the applied signal of the 1 encoded photoelectric conversion signal DCE 1 indicates the value "50" and the applied signal of the 2nd encoded photoelectric conversion signal DCE 2 indicates the value r100j, this encoded color information RD is stored from the memory 54. Read out.

If the device to which this is applied is, for example, a facsimile IJ device, the read encoded color information is appropriately transmitted to the transmitting device and reproduced by a color printer on the receiver side.

In the explanation regarding FIG. 5 above, in order to facilitate understanding, it is assumed that the image of the target scanning line of the original MS is "all white",
For convenience of illustration and explanation, the pixels are assumed to be "all black", "all back color", or "all red", but in reality, as described in the above processing method, pixels corresponding to the cycle of the image signal clock CLK Unit reading) and image processing are performed, and the photoelectric conversion signal CE shown in FIG. They take on complex forms of change depending on their differences.

By the way, in the above-mentioned color discrimination circuit 50 (FIG. 4), the photoelectric conversion signal CE outputted from the image sensor 4 is directly applied to the N-conversion circuit 51, and the encoded photoelectric conversion signal DCE corresponding to the ratio level is generated. I tried to get it, but
As another processing method, before applying the photoelectric conversion signal CF to the above conversion circuit 51, the photoelectric conversion signal obtained during light irradiation with "mixed light of blue light signal BC and red light signal RC" for the same scanning line may be used. From the conversion signal CF to the “red light signal RC
It is also possible to electrically subtract the photoelectric conversion signal CE obtained at the time of light irradiation by ``only'' and add this subtraction signal to the conversion circuit 51 to obtain the encoded photoelectric conversion signal DCE corresponding to the difference. good. The form of the above subtraction signal in such a case,
When the correspondence relationship between the image colors of the read image is graphed, a color distribution diagram as shown in FIG. 7 is obtained. In other words, in the above conversion circuit 51, the photoelectric conversion signal C
Since the accuracy in determining the level of E is substantially relaxed, the present invention is also easier to implement.

Further, in the above embodiment, two fluorescent lamps, a blue fluorescent lamp 1 and a red fluorescent lamp 2, are prepared, and "blue", "red",
The method and apparatus for reading three types of color images of "black"("white" is blank and not included in the image) have been shown, and the selection of these light source colors and the objects to be read (discriminated) are shown. The image color selection 7 is not limited in any way, and any selection can be made depending on the actual situation. A color other than the above that is considered to be commonly used is "green".
, "cyan", "magenta", and "yellow". Of course, if you use three light sources such as the blue light source, red light source, and green light source as described above, it is possible to perform so-called multi-color reading (discrimination). In other words, in this case, the image sensor scans the same part of the document three times, and in synchronization with this scanning cycle, light irradiation is performed by "red light source + blue light source", light irradiation is performed by "red light source + green light source", and light irradiation is performed by "red light source + green light source". Light irradiation using only a red light source may be repeated. In short, at least one of the selected light sources with different spectral characteristics, at least one light source with poor blinking response characteristics, that is, with a long afterglow time, may be kept lit during the entire reading scan period of the document.

Note that the irradiation layer for the above-mentioned irradiation light is arbitrary as long as its periodicity is not impaired. For example, in the case of the above-mentioned embodiment, light irradiation is performed with "red light signal RC only" during the first reading scan on the same line of the image sensor 4, and "blue light signal BC and red light signal RC" are irradiated during the second reading scan. The light irradiation may be performed using a mixture of light and light.

Furthermore, in the above embodiment, a CCD line sensor was used as the image sensor 4, but this selection is also arbitrary), and any sensor may be used as long as it is a photoelectric conversion sensor used in so-called document reading devices. .

〔Effect of the invention〕

According to the color image reading method and apparatus according to the present invention, color images can be read at high speed without being limited by the characteristics of the selected light source.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the schematic configuration of an example of a conventional color image reading device, Fig. 2 is a diagram showing the spectral characteristics of a blue image lamp and a red fluorescent lamp, and Fig. 3 is similar to Fig. 1. 4 is a block diagram showing an embodiment of the color image reading device according to the present invention, and FIG. 5 is a timing chart showing the conventional color image reading method using the device shown in FIG. A timing chart showing an example of the color image reading method according to the present invention using the apparatus, and FIGS. 6 and 7 are color distribution diagrams obtained by the embodiment shown in FIGS. 4 and 5. DESCRIPTION OF SYMBOLS 1... Blue image light, 2... Red fluorescent lamp, 3... Lens, 4... Image sensor, 11.21... Lighting control part, 12.22... Lighting circuit, 40... Image sensor drive circuit, 50... Discrimination circuit, 51... Single force conversion circuit, 52... Switch circuit, 53... Line memory, 54... Color information memory.

Claims (4)

[Claims] (1) When reading and scanning a document having a color image, prepare a plurality of light sources with different spectral characteristics, and keep at least one of them lit during the entire reading and scanning period of the document. During the lighting period of this light source, at least one of the other light sources is blinked at a predetermined period corresponding to the period of the reading scan to irradiate the same scanned portion of the document with light at least twice, and at this time, the document □ A color image reading method for determining the image color of the read and scanned document based on the level of a photoelectric conversion signal obtained by imaging light reflected from a photoelectric conversion element on a photoelectric conversion element. (2) a plurality of document illumination light sources each having different spectral characteristics, and an image sensor arranged so that the reflected light of the light irradiated onto the document from these light sources is formed into an image, and reads and scans the image of the document; a first lighting control means for keeping at least one of the plurality of light sources turned on during the entire reading scan period of the document; and one of the light sources kept turned on by the first lighting control means among the plurality of light sources. a second lighting control means for blinking at least one of the other lights at a predetermined period corresponding to a period of original reading scanning by the image sensor; A color image reading device comprising a discriminating means for discriminating an image color of an original document. (3) The image sensor is a sensor configured with a charge accumulation type photoelectric conversion element, and the predetermined period in which the second lighting control means performs blinking control is synchronized with the charge accumulation period of this sensor. A color image reading device according to claim (2). (4) The plurality of light sources include at least two of a white fluorescent lamp, a red fluorescent lamp, a green image lamp, a blue fluorescent lamp, a cyan fluorescent lamp, a magenta fluorescent lamp, and a yellow fluorescent lamp. Claim No. 2 consisting of a fluorescent lamp
) The color image reading device described in item 2.