JP2007036794A - Scanner device and image reading method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scanner device and an image reading method capable of acquiring color information of an image with high acquisition sensitivity.
A scanner apparatus including an image data reading control unit 30 that reads image data for each color component based on light emitted from a plurality of light sources that emit light of different color components, wherein each light source is turned on simultaneously. The light source control means 31 for switching the simultaneous lighting state and the individual lighting state for individually lighting each color component, the CCD 34 corresponding to each color component, and each CCD 34 when each light source is sequentially lit with a different irradiation light amount in the individual lighting state. Incorrect sensitivity information acquisition means 35 for acquiring the insensitivity sensitivity information of each CCD 34 based on the pixel signal from, the insensitivity sensitivity correction function generation means 36 for generating the insensitivity sensitivity correction function based on the insensitivity sensitivity information, and the simultaneous lighting state Pixel signal correction means 37 for correcting the pixel signal from each CCD 34 based on the fraud sensitivity correction function is provided.
[Selection] Figure 1

Description

  The present invention relates to a scanner device and an image reading method including a plurality of light sources that emit light of different color components and an image data reading unit that reads image data for each color component based on the light emitted from each of the light sources. About.

  Conventionally, a scanner including a light source composed of a plurality of LEDs that emit light of different color components and an image reading unit that reads an image recorded on a recording medium as image data based on the irradiation light from each LED. A device has been proposed.

  In the scanner device, each LED emits light of a red component, a green component, or a blue component, and the irradiation of each color component is performed before the irradiated light of each color component reaches the recording medium. By matching the optical path of the light, white illumination light in which the illumination light of each color component is mixed is generated. In addition, the image reading unit includes a solid-state imaging device that performs photoelectric conversion based on the white irradiation light irradiated through the recording medium and outputs an image signal, and the image reading unit includes the solid-state imaging device. Image data is generated based on the output image signal.

  Further, the solid-state imaging device applied to the scanner device mainly includes a plurality of red photosensitive units that perform photoelectric conversion on the red component irradiation light in the white irradiation light, and the green component irradiation light. A plurality of green photosensitive portions that perform photoelectric conversion and a plurality of blue photosensitive portions that perform photoelectric conversion on the irradiation light of the blue component are arranged in a row, corresponding to the irradiation light of each color component A CCD line sensor composed of three rows of photosensitive portions is used. The CCD line sensor includes the red photosensitive portion, the green photosensitive portion, and the blue photosensitive portion that are adjacent to each other as a set, and the CCD line sensor has the one unit area for an image recorded on the recording medium. An image signal of each color component is output by a set of photosensitive units.

In addition, since the photosensitive portion corresponding to each color component performs photoelectric conversion on light in a wide wavelength range, a color filter corresponding to each color component is laminated on the upper layer of each photosensitive portion. The light of other color components is configured to be blocked.
JP-A-11-341223

  However, as shown in FIG. 7, the color filter laminated on the upper layer of the photosensitive portion does not completely block other color components and transmits a certain amount of leakage light. For this reason, since the photosensitive portion photoelectrically converts the leakage light that is the other color component, the pixel signal as the amount of accumulated charges output from each photosensitive portion is as shown in FIG. In addition to normal information photoelectrically converted based on the color component corresponding to each photosensitive portion, that is, normal sensitivity information, incorrect sensitivity information photoelectrically converted with respect to leakage light that is the other color component is also included. As a result, there has been a problem in that the acquisition sensitivity of the color information of the image recorded on the recording medium is lowered.

  In view of the above-described conventional problems, it is an object of the present invention to provide a scanner device and an image reading method that can acquire color information of an image with high acquisition sensitivity.

  In order to achieve the above-described object, a first characteristic configuration of the scanner device according to the present invention includes a plurality of light sources that emit light of different color components, as described in claim 1 of the claims. A scanner apparatus comprising image data reading control means for reading image data for each color component based on light emitted from each light source, wherein the image data reading control means adjusts the amount of light emitted from each light source. And a light source control means for switching between a simultaneous lighting state for simultaneously lighting each light source and an individual lighting state for individually lighting each color component, a solid-state imaging device corresponding to each color component, and each light source in the individual lighting state Fraud sensitivity information acquisition means for acquiring fraud sensitivity information of each solid-state image sensor based on pixel signals from the respective solid-state image sensors when individually lit with different irradiation light amounts, A fraud sensitivity correction function generating unit that generates a fraud sensitivity correction function based on the acquired fraud sensitivity information, and a pixel that corrects a pixel signal from each of the solid-state imaging devices in the simultaneous lighting state based on the fraud sensitivity correction function. The signal correction means is provided.

  By adopting the above-described configuration, for example, if the individual light sources are individually turned on during reference measurement, the incorrect sensitivity information acquisition unit includes other solid-state imaging elements corresponding to light for each color component. The pixel signal photoelectrically converted according to the light of the color component can be acquired as fraudulent sensitivity information, and the pixel signal photoelectrically converted according to the light of the corresponding color component can be acquired as normal sensitivity information. is there. In addition, since the output correction unit corrects the output signal from each of the solid-state imaging devices in the simultaneous lighting state based on an unauthorized sensitivity correction function based on the unauthorized sensitivity information, the color information of the image with high acquisition sensitivity. Can be obtained.

  As described in claim 2, the second characteristic configuration includes the fraud sensitivity correction function when the light sources are simultaneously turned on by the light source control means in addition to the first characteristic configuration described above. The pixel signal component is a function that removes the pixel signal component photoelectrically converted according to the irradiation light of the color component other than the corresponding color component from the pixel signal of each solid-state imaging device.

  With the above-described configuration, the pixel signal correction unit corrects the pixel signal of each solid-state imaging device when the light sources are simultaneously turned on by the light source control unit based on the fraud sensitivity correction function. Thus, since the normal sensitivity information can be calculated as image data, the color information of the image can be acquired with high acquisition sensitivity.

  In order to achieve the above object, the first characteristic configuration of the image processing method according to the present invention is based on irradiation light from a plurality of light sources that irradiate light of different color components as described in claim 3. An image reading method for reading image data for each color component, wherein the amount of light emitted from each light source is adjusted, and a simultaneous lighting state for simultaneously lighting each light source and a separate lighting state for individually lighting each color component are provided. A light source control step for switching, and an illegality of each solid-state image sensor based on a pixel signal from each solid-state image sensor corresponding to each color component when each light source is individually lit with a different irradiation light amount in the individual lighting state Incorrect sensitivity information acquisition step for acquiring sensitivity information, Incorrect sensitivity correction function generation step for generating an incorrect sensitivity correction function based on the acquired incorrect sensitivity information, and the simultaneous lighting It lies in comprising a pixel signal from the respective solid-state imaging device in state from the output signal correction step of correcting, based on the incorrect sensitivity correction function.

  As described above, according to the present invention, it is possible to provide a scanner device and an image reading method that can acquire color information of an image with high acquisition sensitivity.

  Embodiments of a photo processing apparatus to which a scanner device and an image reading method according to the present invention are applied will be described below. As shown in FIG. 2, the photographic processing apparatus includes a film scanner 1 as a scanner apparatus according to the present invention for reading a photographic image from a photographed negative film (hereinafter simply referred to as “film”) F, and a monitor C1. , Equipped with a console C2 and a system controller C, a plurality of drivers corresponding to various card-type memories such as smart media and compact flash (registered trademark), and magnetic and optical storage media such as CD-ROM and MO. An operation setting unit OP provided, and a printer 3 that exposes and develops photographic paper based on photographic image data read by the film scanner 1 and outputs a photographic print P. The film scanner 1 It is configured separately from the main body composed of the operation setting unit OP and the printer 3.

  As shown in FIG. 3, the printer 3 includes a paper magazine 50 in which roll-shaped photographic paper P is accommodated, a plurality of photographic paper conveyance rollers 52 that draws and conveys the photographic paper from the paper magazine 50, and conveyance rollers A motor 54 for driving 52, a fluorescent beam type print head 60 for exposing the photosensitive surface of the conveyed photographic paper P, and a development processing unit 62 for performing development, bleaching, and fixing processes on the exposed photographic paper. The image forming apparatus includes a drying unit 64 that conveys the developed photographic paper while drying, and a discharge unit 66 that discharges the dried photographic paper P as a final print. Note that the photographic paper P drawn out from the paper magazine 50 is cut into a predetermined print size by a cutter (not shown) disposed either before or after the development processing and is output to the discharge unit 66.

  The print head 60 includes three rows of a red light emitting block, a green light emitting block, and a blue light emitting block in which phosphor elements each having a lens and a color filter mounted on a phosphor whose light emission is controlled by adjusting a grid voltage are arranged in the main scanning direction. The photographic image is generated on the photographic paper by controlling the driving based on the image data of the red component, the green component, and the blue component read by the film scanner 1.

  The system controller C includes a microcomputer system including a CPU, a ROM, a RAM, an I / F circuit, and the like, and is based on an input operation from the console C2 in accordance with various information displayed on the monitor C1. Each block of the above-described film scanner 1 and printer 3 is controlled and operated according to a predetermined procedure.

  The film scanner 1 controls the illumination optical system 10 that irradiates the reading light to the film F, the film transport mechanism 20 that transports the film F, the illumination optical system 10 and the film transport mechanism 20, and the film An image data reading control means 30 for reading a frame image recorded on the film F conveyed by the conveying mechanism 20 as image data based on the irradiation light from the illumination optical system 10 is provided. The image data reading control means 30 is connected to the system controller C by a control signal line L1, so that the system operation is controlled by the system controller C and the read image data is sent to the system controller C. Is configured to send.

  That is, in the film scanner 1, when a film reading command is sent from the system controller C via the control signal line L 1, the image data reading control unit 30 irradiates irradiation light from the illumination optical system 10. Thereafter, the film transport mechanism 20 transports the film F at a predetermined speed, the image data reading control means 30 sequentially reads the frame images recorded on the film, and the read image data is sent to the system controller C by the control. It is configured to transmit via the signal line L1. The image data transmitted to the system controller C is stored in the storage means 70, subjected to predetermined image processing and the like, and then exposed to the photographic paper P by the print head 60 driven based on the image data. Further, it is developed and output as a photographic print.

  Further, when the film scanner 1 is activated, the film scanner 1 performs reference measurement for acquiring fraud sensitivity information, which will be described later, in order to improve the reading accuracy of the image data by the image data reading control means 30. It is configured. That is, the image data reading control means 30 acquires the fraud sensitivity information in advance as a reference measurement when the film scanner 1 is activated, and records it on the film started by the film reading command from the system controller C. In the image data reading operation of reading the frame image as image data, the reconstructed image data is read based on the fraud sensitivity information.

  The illumination optical system 10 includes a columnar red LED group 11r, a green LED group 11g, which are arranged along a main scanning direction orthogonal to a sub-scanning direction (indicated by an arrow in FIG. 3) which is a conveyance direction of the film F. Blue LED group 11b, collimated light from each LED group, collimated lenses 16r, 16g, 16b installed so as to correspond to the LED groups, and the collimated light The dichroic mirrors 17p and 17q that generate white irradiation light by matching the optical path of the irradiation light, the dimming filter 12 that adjusts the irradiation intensity of the white irradiation light, and the like, and the white irradiation light is condensed into a slit shape. A cylindrical lens 13, a diffuser plate 14 for making the intensity distribution of the condensed white irradiation light uniform, and a narrow width through which the condensed white irradiation light passes only at a predetermined timing by its opening and closing operation. With a slit-shaped shutter 15, and is configured to irradiate the light collecting white irradiation light becomes a slit shape along the main scanning direction and the like on the film passes through the shutter 15. The red LED group 11r is configured to emit red component irradiation light, the green LED group 11g is irradiated with green component irradiation light, and the blue LED group 11b is configured to emit blue component irradiation light. Further, the dichroic mirror 17p transmits the irradiation light of the red component irradiated from the 45 ° inclination direction and reflects the irradiation light of other color components irradiated from the 45 ° inclination direction, and the dichroic mirror 17q By transmitting the green component irradiation light irradiated from the 45-degree tilt direction and reflecting the other color component irradiation light irradiated from the 45-degree tilt direction, each of the collimated irradiation lights The optical paths are configured to match.

  In addition, each LED group, that is, the red LED group 11r, the green LED group 11g, and the blue LED group 11b, is adjusted by the light source control means 31 described later, the irradiation light amount for each LED group, It is configured to be able to switch between a simultaneous lighting state in which each LED group is simultaneously lit and an individual lighting state in which each LED group is individually lit.

  The film transport mechanism 20 includes a plurality of transport roller pairs 21 that transport the film F toward a film projection unit directly below the slit 15 and a motor 22 that drives the transport roller pairs 21. The film F is configured to be transported at a predetermined speed.

  As shown in FIG. 1, the image data reading control means 30 includes a condensing lens (not shown) that condenses slit light through which the white irradiation light passes through the film F, and a condensing position by the condensing lens. A CCD line sensor 34 as a solid-state image sensor that photoelectrically converts the collected light, and a stored charge amount photoelectrically converted by the CCD line sensor 34 is acquired as a pixel signal, and image data is obtained based on the pixel signal. The image data generating means 32 to be generated, and the light source control for adjusting the irradiation light quantity for each of the LED groups, and switching between the simultaneous lighting state for simultaneously lighting the LED groups and the individual lighting state for individually lighting the LED groups. A means 31 and a conveyance control means 33 for driving and controlling the film conveyance mechanism 20 and opening and closing the shutter 15 at a predetermined timing. Ete is configured.

  The CCD line sensor 34 includes a plurality of red photosensitive units that perform photoelectric conversion on the red component irradiation light in the condensed light as the white irradiation light, and a plurality of photoelectric conversion units that perform photoelectric conversion on the green component irradiation light. A plurality of blue photosensitive portions that perform photoelectric conversion on the green photosensitive portion and the blue component irradiation light are arranged in a row in the main scanning direction, respectively, so that three rows corresponding to the irradiation light of each color component The photosensitive section for red, the photosensitive section for green, and the photosensitive section for blue that are adjacent to each other in the sub-scanning direction are configured as a pair of photosensitive sections. That is, each frame image on the film is divided into 5000 areas with respect to the main operation direction when there are, for example, 5000 photosensitive portions in 3 rows corresponding to the irradiation light of each color component. In addition, it is configured such that each photosensitive unit pair is decomposed and acquired for each color component of a red component, a green component, and a blue component for each region.

  The light source control means 31 has an individual lighting state in which each LED group is lit up for each LED group so that the irradiation light quantity of the LED group sequentially differs based on a plurality of preset output signals. Switching between the simultaneous lighting states in which the LED groups are simultaneously turned on so that the irradiation light amount of each LED group becomes a stable irradiation light amount based on a predetermined output signal set in advance. It is configured to switch to the individual lighting state and to switch to the simultaneous lighting state during the image data reading operation.

  The transport control means 33 drives and controls the film transport mechanism 20, and at the time of the reference measurement, the film F is placed on an optical path from the irradiation light irradiated from each LED group to the CCD line sensor. The film transport mechanism 20 is controlled and stopped so as not to intervene, and the film F is transported at a predetermined speed by the film transport mechanism 20 when the reading is executed.

  The image data generation means 32 outputs from each photosensitive part of the CCD line sensor when the LED groups are individually lit with sequentially different amounts of light in the individual lighting state, that is, during the reference measurement. A fraud sensitivity information acquiring means 35 for acquiring fraud sensitivity information of each photosensitive portion based on a signal; a fraud sensitivity correction function generating means 36 for generating a fraud sensitivity correction function based on the acquired fraud sensitivity information; In the simultaneous lighting state, that is, during the image data reading operation, the pixel line correction unit 37 is configured to correct the pixel signal from each photosensitive portion of the CCD line sensor based on the fraud sensitivity correction function. Yes.

  The fraud sensitivity information acquisition means 35 is configured to determine whether or not each of the photosensitive units is based on an output signal from each of the photosensitive units of the CCD line sensor when the LED groups are individually lit with different amounts of irradiation light during the reference measurement. It is configured to acquire fraud sensitivity information.

  Here, when the LED groups are simultaneously turned on by the light source control means 31, the accumulated charge amount Rccd that the red photosensitive portion photoelectrically converts is expressed by the red LED group 11r as shown in [Equation 1]. The accumulated charge amount Rr photoelectrically converted based on the irradiation light of the green LED, the accumulated charge amount Rg photoelectrically converted based on the irradiation light of the green LED group 11g, and the photoelectric conversion based on the irradiation light of the blue LED group 11b This is the sum of the stored charge amount Rb.

  Similarly, the accumulated charge amount Gccd photoelectrically converted by the green photosensitive portion is, as shown in [Equation 2], the accumulated charge amount Gr photoelectrically converted based on the irradiation light of the red LED group 11r, and The accumulated charge amount Gg photoelectrically converted based on the irradiation light of the green LED group 11g and the accumulated charge amount Gb photoelectrically converted based on the irradiation light of the blue LED group 11b. As shown in [Equation 3], the accumulated charge amount Bccd to be photoelectrically converted is based on the accumulated charge amount Br that is photoelectrically converted based on the irradiation light of the red LED group 11r and the irradiation light of the green LED group 11g. This is the sum of the accumulated charge amount Bg that is photoelectrically converted and the accumulated charge amount Bb that is photoelectrically converted based on the irradiation light of the blue LED group 11b.

  That is, the unauthorized sensitivity information acquisition unit 35 turns on each of the LED groups individually by the light source control unit 31, and thereby the accumulated charge that the red photosensitive unit photoelectrically converts based on the irradiation light of the red LED group 11r. The accumulated amount of charge Gg photoelectrically converted by the green photosensitive portion based on the amount Rr, the irradiation light of the green LED group 11g, and the blue photosensitive portion photoelectrically converted based on the irradiation light of the blue LED group 11b. The accumulated charge amount Bb is acquired as normal sensitivity information, and the accumulated charge amount Gr photoelectrically converted by the green photosensitive portion based on the irradiation light of the red LED group 11r and the irradiation light of the red LED group 11r. The same amount of accumulated charge Br that the blue photosensitive portion photoelectrically converts and the accumulated charge amount Rg that the red photosensitive portion photoelectrically converts based on the irradiation light of the green LED group 11g The accumulated charge amount Bg photoelectrically converted by the blue photosensitive portion based on the irradiation light of the green LED group 11g and the accumulated charge amount Rb photoelectrically converted by the red photosensitive portion based on the irradiation light of the blue LED group 11b. Similarly, the stored charge amount Gb that is photoelectrically converted by the green photosensitive unit is acquired as incorrect sensitivity information based on the irradiation light of the blue LED group 11b.

  Further, the fraud sensitivity information acquisition unit 35 acquires the normal sensitivity information and the fraud sensitivity information for each irradiation light amount i by adjusting the irradiation light amount i of each LED group by the light source control unit 31. The normal sensitivity information and the inaccurate sensitivity information for each of the acquired irradiation light quantities i are converted into a function that is a relation of a ratio of the inaccuracy sensitivity information and the normal sensitivity information to the normal sensitivity information. . That is, the fraud sensitivity information acquisition unit 35 uses the accumulated charge amount Gr (i) and the accumulated charge amount with respect to the accumulated charge amount Rr (i) shown in FIG. The first function which is the relationship of the ratio of the charge amount Rr (i), the accumulated charge amount Br (i) and the accumulated charge amount Rr (i) with respect to the accumulated charge amount Rr (i) shown in FIG. A third function which is a relationship between a ratio of the accumulated charge amount Rg (i) and the accumulated charge amount Gg to the accumulated charge amount Gg (i) shown in FIG. FIG. 4D shows a fourth function which is the relationship between the accumulated charge amount Bg (i) and the accumulated charge amount Gg (i) with respect to the accumulated charge amount Gg (i) shown in FIG. The accumulated charge amount Rb (i) with respect to the accumulated charge amount Bb (i) shown in FIG. The fifth function, which is the ratio of the product charge amount Bb (i), and the stored charge amount Gb (i) and the stored charge amount Bb with respect to the stored charge amount Bb (i) shown in FIG. (I) It is comprised so that it may convert into the 6th function which is the relationship of ratio.

  The fraud sensitivity correction function generation means 36 includes the [Equation 1], the [Equation 2], the [Equation 3], and the first function converted by the fraud sensitivity information acquisition means 35, the first function Based on the two functions, the third function, the fourth function, the fifth function, and the sixth function, the LED groups are simultaneously turned on by the light source control means 31 as shown in [Equation 4]. The accumulated charge amount Rccd photoelectrically converted by the red photosensitive portion, the accumulated charge amount Gccd photoelectrically converted by the green photosensitive portion, and the accumulated charge amount Bccd photoelectrically converted by the blue photosensitive portion. The green charge is corrected based on the accumulated charge amount Rr photoelectrically converted by the red photosensitive unit based on the irradiation light of the red LED group 11r as the normal sensitivity information and the irradiation light of the green LED group 11g. Photosensitive part is photoelectric Based on the accumulated charge amount Gg to be converted and the irradiation light of the blue LED group 11b, an improper sensitivity correction function capable of calculating the accumulated charge amount Bb photoelectrically converted by the blue photosensitive portion is generated. Yes. In other words, the fraud sensitivity correction function is determined according to irradiation light of a color component other than the corresponding color component from the pixel signal of each solid-state imaging device when the light sources are simultaneously turned on by the light source control unit. This is a function for removing the photoelectrically converted pixel signal component.

Α _rr , α _rg , α _rb , α _gr , α _gg , α _gb , α _br , α _bg , α _bb , β _rr , β _rg , β _rb , β _gr , β _gg , β _gb , β _br , β _bg , and β _bb are constants that are inevitably determined by the function and the like.

  The pixel signal correction unit 37 simultaneously turns on the LED groups by the light source control unit 31 during the image data reading operation, and the pixel signal as the accumulated charge amount Rccd photoelectrically converted by the red photosensitive unit, The pixel signal as the accumulated charge amount Gccd photoelectrically converted by the green photosensitive portion and the pixel signal as the accumulated charge amount Bccd photoelectrically converted by the blue photosensitive portion are corrected based on the fraud sensitivity correction function. Thus, based on the irradiation light of the red LED group 11r as the normal sensitivity information, the accumulated charge amount Rr photoelectrically converted by the red photosensitive unit and the green photosensitive unit based on the irradiation light of the green LED group 11g. The amount of accumulated charge Gg photoelectrically converted and the amount of accumulated charge Bb photoelectrically converted by the blue photosensitive portion based on the irradiation light of the blue LED group 11b are defined as image data. It is configured to calculate Te.

  Hereinafter, the operation of the image data reading control means 30 will be described with reference to the flowcharts of FIGS. When the photographic processing apparatus is powered on and the film scanner 1 is activated, the image data reading control means 30 starts the reference measurement.

  That is, the conveyance control unit 33 controls the film conveyance mechanism 20 so that the film F does not intervene on the optical path from the irradiation light emitted from each LED group to the CCD line sensor, and then stopped. The shutter 15 is closed (SA2). Further, the unauthorized sensitivity information acquisition means 35 resets the accumulated charge amount accumulated in each photosensitive portion in the CCD line sensor 34 (SA3). That is, the accumulated charge amount is emptied. Then, for example, the light source control unit 31 first sets the red LED group 11r so that the irradiation light amount i sequentially becomes different irradiation light amounts i based on a plurality of preset output signals V (i). Individual lighting (SA4).

  When the red LED group 11r is individually turned on by the light source control means 31 based on the output signal V (i), the transport control means 33 opens and closes the shutter 15 for a predetermined time. That is, the irradiation light from the red LED group 11r not passing through the film F is passed through the shutter 15 as slit light, and the slit light is irradiated on the CCD line sensor for a predetermined time (SA5).

  When the slit light is irradiated onto the CCD line sensor, each photosensitive portion in the CCD line sensor 34 performs photoelectric conversion based on the irradiation light from the red LED group 11r (SA6). Accumulated charge amount accumulated by photoelectric conversion in each photosensitive portion of the CCD line sensor 34 by the information acquisition means 35, that is, accumulated charge amount Rr (normal sensitivity information accumulated in the red photosensitive portion) i) the accumulated charge amount Gr (i) as incorrect sensitivity information accumulated in the green photosensitive portion and the accumulated charge amount Br (i) as incorrect sensitivity information accumulated in the blue photosensitive portion, respectively, as pixel signals And the accumulated charge amount accumulated in each photosensitive portion is emptied (SA7).

  When the light source control means 31 sequentially changes the irradiation light amount i of the red LED group 11r to different irradiation light amounts i (SA3), the processing from step SA4 to step SA6 for each irradiation light amount of the red LED group 11r ends ( SA8) The processing from step SA4 to step SA8 is similarly executed for the green LED group 11g and the blue LED group 11b. At this time, when the green LED group 11g is individually lit, the incorrect sensitivity information acquisition unit 35 stores the accumulated charge amount Rg (i) as the incorrect sensitivity information stored in the red photosensitive portion, and the green color. The accumulated charge amount Gg (i) as normal sensitivity information accumulated in the photosensitive portion for image and the accumulated charge amount Bg (i) as incorrect sensitivity information accumulated in the blue photosensitive portion are respectively acquired as pixel signals, and When the blue LED group 11b is individually lit, the stored charge amount Rb (i) as the incorrect sensitivity information stored in the red photosensitive portion and the stored as the incorrect sensitivity information stored in the green photosensitive portion. The charge amount Gb (i) and the accumulated charge amount Bb (i) as normal sensitivity information accumulated in the blue photosensitive portion are respectively acquired as pixel signals.

  When the individual lighting of each LED group ends (SA9), the fraud sensitivity information acquisition unit 35 displays the acquired normal sensitivity information and fraud sensitivity information for each irradiation light amount i as shown in FIG. 4 (a). The first function which is the relationship between the accumulated charge amount Gr and the accumulated charge amount Rr with respect to the accumulated charge amount Rr, the accumulated charge amount Br and the accumulated charge with respect to the accumulated charge amount Rr shown in FIG. A second function that is a relation of the amount Rr, a third function that is a relation of the ratio of the accumulated charge amount Rg and the accumulated charge amount Gg to the accumulated charge amount Gg shown in FIG. 4 (d), the fourth function which is the ratio of the stored charge amount Bg to the stored charge amount Gg with respect to the stored charge amount Gg, and the stored charge amount Bb shown in FIG. Accumulated charge amount Rb and the accumulation A fifth function that is a relationship of the ratio of the load amount Bb and a sixth function that is a relationship of the ratio of the accumulated charge amount Gb to the accumulated charge amount Bb with respect to the accumulated charge amount Bb shown in FIG. (SA10).

  When the fraud sensitivity information acquisition means 35 converts and generates the first function, the second function, the third function, the fourth function, the fifth function, and the sixth function, the fraud sensitivity correction The function generation means 36 generates the fraud sensitivity correction function shown in the above [Equation 4] based on these functions and the above [Equation 1], [Equation 2], and [Equation 3] (SA11), Reference measurement ends.

  When a film reading command is input from the system controller C after a film is set on the film scanner 1 and the reference measurement is completed, the image data reading control means 30 starts the image data reading operation.

  That is, the light source control means 31 lights the LED groups simultaneously based on a predetermined output signal set in advance so that the irradiation light amount of each LED group becomes a stable irradiation light amount (SB1). The transport controller 33 starts control of the film transport mechanism 20 so that the film F sequentially passes on the optical path from the LED group to the irradiation light reaching the CCD line sensor (SB2). ) And the opening / closing control of the shutter 15 is also started (SB3).

  The pixel signal correcting means 37 uses the pixel signal as the accumulated charge amount Rccd photoelectrically converted by the red photosensitive portion and the accumulated charge amount Gccd photoelectrically converted by the green photosensitive portion each time the shutter 15 is opened and closed. And the pixel signal as the accumulated charge amount Bccd photoelectrically converted by the blue photosensitive portion (SB4), and correcting these based on the fraud sensitivity correction function, thereby obtaining the normal sensitivity information. The accumulated charge amount Rr, the accumulated charge amount Gg, and the accumulated charge amount Bb are calculated, and the calculated normal sensitivity information is used as image data (SB5).

  The calculated image data is transmitted to the system controller C.

Explanatory drawing of image data reading control means External view of a photo processing apparatus including a film scanner Block diagram of a photo processing apparatus including a film scanner It is explanatory drawing of the function which is the relationship of the ratio of the inaccuracy sensitivity information with respect to normal sensitivity information, and normal sensitivity information, (a) is the accumulation charge amount Gr (i) with respect to accumulation charge amount Rr (i), and accumulation charge amount Rr (i. ) Of the first function, (b) is the second function of the ratio of the accumulated charge amount Br (i) and the accumulated charge amount Rr (i) to the accumulated charge amount Rr (i), (c ) Is the third function which is the relationship between the accumulated charge amount Rg (i) and the accumulated charge amount Gg with respect to the accumulated charge amount Gg (i), and (d) is the accumulated charge amount Bg (i) with respect to the accumulated charge amount Gg (i). ) And the fourth function which is the relationship between the accumulated charge amount Gg (i) and (e) is the relationship between the accumulated charge amount Rb (i) and the accumulated charge amount Bb (i) with respect to the accumulated charge amount Bb (i). (F) is the accumulated charge amount Gb (i) and the accumulated charge amount B with respect to the accumulated charge amount Bb (i). The ratio of the relationship between (i) Flow chart for explaining the operation of the image data reading control means 30 at the time of reference measurement Flowchart for explaining the operation of the image data reading control means 30 during the image data reading operation Illustration of shading performance of color filter Illustration of normal sensitivity information and fraud sensitivity information

Explanation of symbols

1: Film scanner 11b: Blue LED group 11g: Green LED group 11r: Red LED group 30: Image data reading control means 31: Light source control means 32: Image data generation means 33: Conveyance control means 34: CCD line sensor 35: Incorrect Sensitivity information acquisition means 36: unauthorized sensitivity correction function generation means 37: pixel signal correction means

Claims (3)

A scanner device comprising a plurality of light sources that irradiate light of different color components, and image data reading control means that reads image data for each color component based on irradiation light from each of the light sources,
The image data reading control means adjusts the amount of light emitted from each light source, and switches between a simultaneous lighting state in which the light sources are simultaneously turned on and an individual lighting state in which each color component is individually turned on, and the color component Incorrect sensitivity information of each solid-state image sensor based on a pixel signal from each solid-state image sensor when the solid-state image sensor corresponding to each and each light source is individually lit with a different irradiation light amount in the individual lighting state. Incorrect sensitivity information acquisition means for acquiring, incorrect sensitivity correction function generation means for generating an incorrect sensitivity correction function based on the acquired incorrect sensitivity information, and pixel signals from the respective solid-state imaging devices in the simultaneous lighting state A scanner device comprising pixel signal correction means for correcting based on an unauthorized sensitivity correction function.   The fraud sensitivity correction function is photoelectrically converted according to irradiation light of a color component other than the corresponding color component from the pixel signal of each solid-state imaging device when the light sources are simultaneously turned on by the light source control means. The scanner device according to claim 1, wherein the scanner device is a function for removing the processed pixel signal component. An image reading method for reading image data for each color component based on irradiation light from a plurality of light sources that emit light of different color components,
A light source control step of adjusting the amount of light emitted from each light source and simultaneously switching between a simultaneous lighting state in which the light sources are simultaneously turned on and an individual lighting state in which each color component is individually turned on, and the light sources sequentially differ in the individual lighting state. An unauthorized sensitivity information acquisition step of acquiring unauthorized sensitivity information of each solid-state image sensor based on pixel signals from each solid-state image sensor corresponding to each color component when individually lit with an irradiation light amount; From an unauthorized sensitivity correction function generating step for generating an unauthorized sensitivity correction function based on sensitivity information, and an output signal correcting step for correcting the pixel signal from each of the solid-state imaging devices in the simultaneous lighting state based on the unauthorized sensitivity correction function An image reading method.

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