JP2005064772A - Film image input apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a film image input apparatus capable of securing a gradation number in a state that the intention of a photographing person is employed and obtaining image data with high gradation number, while eliminating the influence of color component of a base material of a film without causing an increase in the number of parts, irrespective of the difference of film manufacturers. <P>SOLUTION: The apparatus is provided with an image input section 10 provided with a solid-state image pickup element 5, an amplifying means 6 for amplifying the output signal of the solid-state image pickup element, and a quantizing means 8 for quantizing an output signal of the amplifying means; and a reading control means for reading a film image under a reading condition previously set by the section 10, adjusting the reading condition so that the output level of the amplifying means corresponds to the range of the input level of the quantizing means on the basis of the obtained image data, and reading the film image again. The reading control means adjusts the reading condition on the basis of the maximum density difference between the density of the photographed portion of the image data read under the predetermined condition and the density of an unphotographed portion thereof. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention provides a solid-state imaging device, an amplifying unit for amplifying the output signal of the solid-state imaging device, a quantizing unit for quantizing the output signal of the amplifying unit, and the image input unit The film image is read under a reading condition set in advance by the above, and the reading condition is adjusted based on the obtained image data so that the output level of the amplification means corresponds to the input level range of the quantization means, The present invention relates to a film image input apparatus provided with a reading control means for rereading a film image.

  In recent years, digital image data corresponding to a film image obtained photoelectrically using a solid-state image sensor is subjected to various image processing to generate output image data, and recording modulated based on the image data 2. Description of the Related Art Digital photographic printers that develop after light is scanned and exposed on a photosensitive material have been put into practical use.

  In this type of digital photographic printer, in order to generate digital image data, reading light emitted from a light source is incident on a film, and projection light of the film image is generated by an imaging lens such as a CCD sensor that is a solid-state image sensor. A film image input device is provided which forms an image on an image sensor, performs photoelectric conversion, amplifies the photoelectrically converted analog signal by an amplification unit, and converts it into digital data by an A / D converter as a quantization unit.

  In order to reproduce a high-quality image with the digital photographic printer described above, it is necessary to read with a high density resolution when reading a film image with a film image input device. Even with film that can shoot density images, the density range of images that are actually shot is much narrower than that, and very low-density images and vice versa due to underexposure and overexposure. Therefore, it is difficult to read with uniform high resolution.

Therefore, prior to the main scanning operation, which is a reading operation for obtaining image data for output, prescanning is performed at a low resolution under a predetermined reading condition, that is, a film image in the entire density range can be read. The reading condition during the main scanning operation is set so that the number of gradations is increased based on the image data obtained by the pre-scanning operation so that the output level of the amplifying unit matches the input level range of the quantizing unit. In addition, a technique for setting the charge accumulation time of the CCD sensor has been proposed.
JP-A-8-279900

  However, according to the technique described in Patent Document 1 described above, the output of the amplifying unit is based on image data corresponding to a film image obtained by pre-scanning, for example, pixel data constituting an image represented in a histogram. Since the reading condition is set so that the level matches the input level range of the quantizing means, there is a problem that although the number of gradations is ensured, the photographing state of the original image cannot be read faithfully. For example, when the photographer deliberately overexposes, the image data recognized as black becomes gray and a sense of incongruity occurs.

  Furthermore, when reading color film images, in order to remove the influence of the base material of the film, a color conversion filter is provided, or the red, green, and blue components of the base material of the film are measured in advance. It is necessary to set the charge accumulation time of the corresponding three-color photosensor, the gain of the amplification means, etc. In the former case, not only the number of parts increases, but also the light quantity of the light source decreases due to the filter, resulting in energy loss. In the latter case, there is a problem that complicated control such as pre-scanning after measuring the red component, green component, and blue component of the film base material in advance is required. Each color component of the base material varies depending on the film manufacturer and film sensitivity. There is a problem that can not respond.

  In view of the above-mentioned conventional drawbacks, the present invention can secure the number of gradations in a state where the photographer's intention is utilized, and the base material of the film without increasing the number of parts regardless of differences in film makers and the like. The present invention provides a film image input device that can obtain image data with a high number of gradations while allowing the influence of the color components to be eliminated.

  In order to achieve the above-described object, the first characteristic configuration of the film image input device according to the present invention is as described in claim 1 of the claims, and includes a solid-state image sensor and an output signal of the solid-state image sensor. An image input unit comprising an amplifying unit for amplifying the image and a quantizing unit for quantizing an output signal of the amplifying unit; and a film image read by the image input unit under a reading condition set in advance. A film image input device comprising: a reading control unit that adjusts the reading condition so that an output level of the amplification unit corresponds to an input level range of the quantization unit based on image data, and reads the film image again. The reading control means adjusts the reading condition based on the maximum density difference between the density of the imaging region and the density of the non-imaging region of the image data read under a preset condition. To the point that there is.

  According to the configuration described above, the reading condition is adjusted so that the output level of the amplifying unit corresponds to the input level range of the quantizing unit based on the maximum density difference between the density of the imaging region and the density of the non-imaging region. Therefore, even if an expensive A / D converter with a large number of bits is not used as a quantization means, for example, in the case of a negative film, an unphotographed portion, that is, a film base member (cover region) and a photographing portion (image portion) ) Image with the maximum number of gradations can be input, and with reversal film, an image with the maximum number of gradations can be input between the unexposed part of the film and the minimum density of the imaged part. Become. In addition, since the image data based on the non-photographed portion can be obtained, a sufficient number of gradations can be secured in a state where the photographer's intention to shoot is utilized. Here, the reading conditions include various conditions such as the light amount of the light source, the charge accumulation time of the solid-state imaging device, and the gain and offset adjustment by the amplifying means.

  In the second feature configuration, as described in claim 2 of the same column, in addition to the first feature configuration described above, the reading control unit is configured to process a plurality of frame images read under a preset condition. Then, the adjustment data of the reading condition is generated for each frame image and stored in the adjustment data storage unit, and the corresponding frame image is adjusted after the reading condition is adjusted based on the adjustment data stored in the adjustment data storage unit. Is configured to read again.

  With this configuration, for example, even when pre-scanning for one film is performed, image data having the maximum number of gradations can be efficiently read in frame image units.

  In the third feature configuration, as described in claim 3 of the same column, in addition to the first feature configuration described above, the reading control unit is configured to process a plurality of frame images read under a preset condition. After adjusting the reading conditions based on the adjustment data stored in the adjustment data storage unit, the adjustment data for the reading conditions is generated in units of designated frame image groups and stored in the adjustment data storage unit. The corresponding frame image is configured to be read again.

  For example, for film images shot under the same conditions, such as continuous scene shooting and panoramic shooting, the reading conditions are adjusted on a frame image basis by adjusting the reading conditions on a frame image group basis. Thus, it is possible to eliminate the uncomfortable feeling between individual prints that occurs in the print based on the image data obtained in this way.

  In the fourth feature configuration, as described in claim 4 of the same column, in addition to any of the first to third feature configurations described above, the reading condition is an offset and a gain of the amplification means, The offset and gain are adjusted so that the maximum density difference between the density of the imaging region and the density of the non-imaging region of the image data corresponds to the input level range of the quantization means.

  When adjusting the charge accumulation time, it is necessary to adopt a complicated structure corresponding to the film feed speed, for example, but in this case, a switching circuit for adjusting the offset and gain is simply provided in the amplification means. All that is required is extremely economical and easy to implement.

  In the fifth feature configuration, as described in claim 5 of the same column, in addition to any of the first to third feature configurations described above, the reading condition is an offset and a gain of the amplification means, The offset and gain are adjusted so that the maximum density difference between the RGB density of the imaged region of the image data and the RGB density of the unimaged region corresponds to the input level range of the quantization means. .

  In the case of a color film, the gain and offset of the amplifying means corresponding to each of RGB are set such that the maximum density difference between the density of any RGB of the imaged part of the image data and the density of any of the RGB of the unphotographed part is the quantization means. By uniformly setting so as to correspond to the input level range, it is possible to obtain image data with the maximum number of gradations without causing fluctuations in color balance, and from the obtained image data By subtracting the RGB data of the unphotographed part, the influence of the color of the base member of the film can be easily eliminated.

  In the sixth feature configuration, as described in claim 6 of the same column, in addition to any of the first to third feature configurations described above, the reading condition is an offset and a gain of the amplification means, The offset and gain are adjusted so that the maximum density difference between the RGB density of the imaged region of the image data and the density of the unimaged region corresponding to the color corresponds to the input level range of the quantization means. is there.

  Also in this case, as described above, it is possible to obtain image data having the maximum possible number of gradations without causing color balance fluctuations.

  In the seventh feature configuration, as described in claim 7 of the same column, in addition to any of the first to sixth feature configurations described above, the density of the imaging region is in an area of a predetermined pixel size or more. It is a point that is required for this.

  In order to specify the density of the photographing unit, the maximum or minimum data of the film image data read under a preset reading condition is obtained. In this case, for the area having a predetermined pixel size or more. As a result, the influence of minute scratches and dirt on the film surface is eliminated, and accurate input becomes possible. Here, for example, in the case of a negative film, if there is a scratch on the film surface, the amount of transmitted light at that portion decreases and the image becomes darker than the actual image.

  As described above, according to the present invention, the number of gradations can be secured in a state where the photographer's intention is utilized, and the base material of the film can be obtained without increasing the number of parts regardless of differences in film makers. It is now possible to provide a film image input device that can obtain image data with a high number of gradations while allowing the influence of the color components to be eliminated.

  Embodiments of a film image input device according to the present invention will be described below. As shown in FIG. 1, the film image input device is a device that photoelectrically reads an image photographed on a film F one frame at a time by a linear CCD sensor 5 as a solid-state image sensor, and includes an image input unit 10 and an image input unit. 10 includes an image input control unit 20 that controls an image input operation by the image input unit 10, and an image processing unit 30 that performs a required process on the input image by the image input unit 10.

  The image input unit 10 includes a halogen lamp 1 as a light source, a mirror tunnel 2 that diffuses a light flux from the halogen lamp 1, and a slit 3 that narrows the diffused light flux into slit light in the short width direction of the film F. The light beam passing through the film F from the slit 3 is focused on the light receiving portion of the linear CCD sensor 5 having three light receiving portions for reading R (red), G (green), and B (blue) image components. An imaging lens unit 4 to be operated, an amplification circuit 6 having an operational amplifier as an amplification means for amplifying the output signal of the linear CCD sensor 5, a sample hold circuit 7 for sample-holding the output signal of the amplification circuit 6, and a sample hold circuit A 12-bit A / D converter 8 as a quantization means for quantizing the output of 7 is provided, and a long negative film of APS, 135 size, Depending on the form such as a film, such as Lips or slide, and includes a film carrier 9 for automatically transporting the film. Here, the amplifying circuit 6, the sample hold circuit 7, and the A / D converter 8 are provided separately for R, G, and B, respectively, which are realized by being assembled discretely, or a linear CCD. What is constituted as an integrated circuit including a sensor etc. can be constituted suitably.

  The film carrier 9 has a negative mask 91 for positioning the film F, a pair of upper and lower transport rollers 92 and 93 for transporting the negative film F in the direction of the arrow, And a pulse motor 94 for driving the rollers 92 and 93.

  The image input control unit 20 executes lighting on / off of the light source 1, lighting light amount control, driving control of the solid-state imaging device 5, gain and offset adjustment control of the amplifying unit 6, film transport control by the film carrier 9, and the like. A control CPU, a ROM storing an execution program thereof, a RAM storing various control data, and the like, and a plurality of light receiving portions are arranged in a row along the width direction of the negative film F, respectively. In the constituent elements of the image input unit 10, reading is performed in the main scanning direction by the arranged linear CCD sensors 5, and the film F is conveyed in the direction orthogonal to the arrangement direction and reading is performed in the sub-scanning direction. Controls a certain film carrier 9, light source 1 and the like, and all film images including images taken on film F are subjected to preset reading conditions. Pre-scanning operation that reads at low resolution and two image scanning operations of the main scanning operation that reads the image area captured on the film at high resolution under the scanning conditions set based on the scanned image data by the pre-scanning operation Execute.

  As shown in FIG. 2, the image processing unit 30 includes an input image processing unit 31 that performs shading correction and the like on each of the R, G, and B image data converted into digital data by the A / D converter 8; A pre-scan image memory 32 for storing pre-scan image data processed by the input image processing unit 31; a main-scan image memory 37 for storing image data for main scan processed by the input image processing unit 31; A reading condition setting unit 40 that sets reading conditions by the image input unit 10 during pre-scanning and main scanning, a display unit 34 that displays an image based on image data stored in the pre-scanning image memory 32, and a display unit For images to be output such as color balance adjustment, saturation adjustment, gradation adjustment, density adjustment, magnification conversion processing, etc. A keyboard 35 and mouse 36 for setting and inputting image processing conditions to be set, an image processing condition setting unit 41 for setting and storing the input image processing conditions for each frame image, and conditions set by the image processing condition setting unit 41 Based on this, image conversion processing units 33 and 38 for converting the pre-scan image and the main scan image, and the main scan image converted by the image conversion processing unit 38 are converted into data suitable for the output device 50 and output. An output image processing unit 39 is provided.

  The reading condition setting unit 40 supports a wide range of images with a film density D of about 0 to 4 so that the output can be reliably read without saturating any film image during the pre-scan operation. Then, the light amount of the light source 1, the charge accumulation time of the solid-state imaging device 5, and the gain and offset of the amplifier circuit 6 are set to predetermined appropriate values and output to the image input control unit 20 as reading condition data. The image input control unit 20 that has received the reading condition data sets the light amount of the light source 1, the charge accumulation time of the solid-state imaging device 5, and the gain and offset of the amplifier circuit 6 based on the reading condition data, and performs a pre-scan operation. Execute.

  Then, the reading condition setting unit 40 reads out the image data obtained by the pre-scan from the pre-scan image memory 32 after the pre-scan operation is finished, and sets the maximum density difference between the density of the imaging region and the density of the non-imaging region. Based on this, the scanning conditions for the main scan are generated so that the output level of the amplifier circuit 6 corresponds to the input level range of the A / D converter 8 and output to the image input control unit 20.

  The image input control unit 20 receives the reading condition data for the main scan, and sets the light amount of the light source 1, the charge accumulation time of the solid-state imaging device 5, and the gain and offset of the amplification means 6 based on the reading condition data. The main scan operation is executed. Data read in the main scan is stored in the main scan image memory 37 via the input image processing unit 31. That is, the image input control unit 20 and the reading condition setting unit 40 read a film image under the reading conditions preset by the image input unit 10, and the output level of the amplification means 6 is quantized based on the obtained image data. The reading condition is adjusted so as to correspond to the input level range of the means 8, and the reading control means reads the film image again.

  The principle of setting the reading conditions during the main scan by the reading condition setting unit 40 will be described in detail. The output data of any of R, G, and B at the time of pre-scanning of the solid-state imaging device 5 on the alternate long and short dash line L across the center of the frame images F1, F2,... Of the negative film F shown in FIG. When attention is paid, as shown in the left diagram of FIG. 3B, the flat portion Sb corresponding to the base member Fb of the film F and the image portion Si corresponding to the frame image are represented as an uneven output pattern. Such output data is converted into digital data by the A / D converter 8 through the amplifier circuit 6 and the sample hold circuit 7. Based on the image data obtained at this time, FIG. As shown in the right figure, the light amount of the light source 1, the charge accumulation time of the solid-state imaging device 5, the gain and offset of the amplifier circuit 6 are set so that the output level of the amplifier circuit 6 corresponds to the input level range of the A / D converter 8. The reading conditions of any of the above conditions, or the combined reading conditions are generated based on a predetermined relational expression or built-in table data.

  In the above description, paying attention to the output data of any one of R, G, and B at the time of pre-scanning of the solid-state imaging device 5 on the alternate long and short dash line L across the center of the frame images F1, F2,. As described above, actually, the reading conditions for the main scan are set based on the data over the entire film area obtained by the pre-scan. Further, the density of the base member and the density of the imaging region are obtained as effective image data for an area of a predetermined pixel size or more, thereby eliminating the influence of dirt and scratches on the film surface. Yes. For example, the spike-like signal N over several pixels shown in the left diagram of FIG. 3B is eliminated as noise due to the effect of scratches, and the reading condition is determined based on other signal levels excluding the spike-like signal N. Is set. Here, the value set as the predetermined pixel size determined as noise differs depending on the resolution of the film image input device and is not particularly limited. For example, for a scratch having a sufficient width of several millimeters It is appropriately set between several tens to several hundreds of pixels.

  Hereinafter, in the present embodiment, the light amount of the light source 1 and the charge accumulation time of the solid-state imaging device 5 are set to be constant between the pre-scan and the main scan, and the gain and offset by the amplifier circuit 6 are adjusted. explain.

  As shown in FIG. 4, the image input control unit 20 controls the lighting by adjusting the light source 1 to a preset light amount, and fixes the charge accumulation time of the linear CCD sensor 5 to a preset value, as well as an amplifier. Are set as prescan image reading conditions instructed by the reading condition setting unit 40 (S1). Thereafter, the film scanner 9 is driven to transport the film, and the linear CCD sensor 5 is driven to perform a preliminary scan for reading the entire image of the unphotographed portion and the photographing portion with respect to the film F (S2). The obtained image data is stored in the prescan image memory 32 (S3).

  The reading condition setting unit 40 reads the data stored in the pre-scan image memory 32, and selects the smallest of the pixel groups having the same density with respect to each of R, G, and B of the imaging region and having a predetermined pixel size or more. A value to be a value is obtained (S4), and each density of R, G, and B (that is, the density of the base member (missing portion)) of the non-imaging region is obtained (S5), and the maximum of the imaging region and the non-imaging region is obtained. A density difference is calculated and derived (S6). Offset and gain adjustment data for each amplifier circuit 6 is generated so that the obtained maximum density difference corresponds to the input level range of the A / D converter 8, that is, the maximum input span that can be quantized linearly (S7). . For example, when the B component is the highest (brighter) with respect to the density of the non-imaging region and the R component is the lowest (darker) with respect to the density of the imaging region, the B component density and the R component of the imaging region are not. The offset difference and gain adjustment data of each amplifier circuit 6 are generated so that the maximum density difference corresponds to the maximum input span of the A / D converter 8. By making adjustments in this way, during the actual scan, each color data is recorded with the maximum number of gradations without losing color balance in the range from the film base member (cover) to the maximum density of the imaging region. Can be input.

  On the other hand, the image conversion processing unit 33 cuts out an image area from the pre-scan image memory 32 and performs a thinning process, and then displays a plurality of frame images with a predetermined size on the display unit 34 to set image processing conditions. The pre-judge process by the unit 41 is executed (S8). The pre-judge process is an operation input to the frame image displayed on the display unit 34 by the operator via the keyboard 35 and the mouse 36, and image processing conditions such as color balance adjustment and saturation for each frame image. In the process of adjusting and inputting image processing conditions such as adjustment, gradation adjustment, density adjustment, and magnification conversion processing, the image converted by the image conversion processing unit 33 based on the conditions set by the image processing condition setting unit 41 The quality of the image displayed on the display unit 34 and finally printed out by the operator is visually confirmed.

  When the pre-judgment is completed in this way, the image input control unit 20 sets the offset and gain of the amplifier circuit 6 to the reading conditions for the main scan set by the reading condition setting unit 40, and the film image is one frame. The main scan to be read in units is started (S10). Image data read by the main scan is stored in the main scan image memory 37 (S11). Thereafter, image conversion processing is performed on the basis of the conditions read by the image conversion processing unit 38 and set by the image processing condition setting unit 41 in pre-judge processing (S12), and suitable for the output device 50 by the output image processing unit 39. The data is converted and output (S13). When such reading of image data and output processing to the output device 50 are completed for all the frames, a series of processing ends (S14).

  Furthermore, in another aspect, the maximum density difference between the density of any of R, G, and B in the imaging region of the image data and the density of the non-imaging region corresponding to the color corresponds to the input level range of the A / D converter 8. In this way, the offset and gain of the amplifier circuit 6 can be adjusted. For example, the maximum density difference between the density of the non-imaging part of the B component and the density of the imaging part, the maximum density difference between the density of the non-imaging part of the G component and the density of the imaging part, the density of the non-imaging part of the R component and the imaging When the maximum density difference between the density of the non-imaging part of the G component and the density of the imaging part is the largest between the maximum density difference of the density of the parts, the density of the non-imaging part of the G component and the density of the imaging part The maximum density difference is defined as the maximum density difference, and offset and gain adjustment data of each amplifier circuit 6 is generated so that the maximum density difference corresponds to the maximum input span of the A / D converter 8.

  In any case described above, since the base densities of R, G, and B of the base member of the film are known from the pre-scan data, the R, G, and B obtained in the main scan based on the data are determined. By correcting the image data of each B, image data in which the influence of the density of the base member of the film is eliminated can be obtained.

  The reading conditions for the main scan described above are generated for each frame image by the reading condition setting unit 40 after the image for one film is read by pre-scanning, and provided in the reading condition setting unit 40 or the image input control unit 20. Configured to be read again after the reading conditions are adjusted based on the adjustment data stored in the adjustment data storage means. Therefore, image data having the maximum number of gradations can be efficiently read in frame image units.

  As yet another aspect, the reading condition for the main scan is that after reading an image for one film at the time of pre-scanning, adjustment data of the reading condition is generated for each frame image group designated by the keyboard 35 and the mouse 36, It is stored in an adjustment data storage means (not shown) provided in the reading condition setting section 40 or the image input control section 20, and the reading conditions are adjusted based on the adjustment data stored in the adjustment data storage means. After that, the corresponding frame image may be read again. In this case, for film images shot under the same conditions, such as continuous scene shooting and panoramic shooting, the reading conditions are adjusted for each frame image group by adjusting the reading conditions for each frame image group. It is possible to eliminate a sense of incongruity between individual prints caused by printing based on image data obtained by adjustment.

  In the above-described embodiments, a film image input device that includes a color linear CCD sensor as a solid-state imaging device and reads a film image as color data has been described. However, the present invention is not limited to a color image, and is a monochrome image. The linear CCD sensor can be used to read monochrome film images, and the maximum density difference between the density of the imaged area and the density of the unimaged area of the image data obtained by prescanning is input to the quantization means. The reading conditions for the main scan need only be set so as to correspond to the level range. In this case as well, the reading conditions include various conditions such as the light amount of the light source, the charge accumulation time of the solid-state imaging device, and the gain and offset of the amplifier circuit Or any combination thereof.

  In the above-described embodiments, the linear CCD sensor is used as the solid-state imaging device and the image input unit configured to read the film image by slit light has been described. However, the configuration of the image input unit is not limited to this. Alternatively, an area CCD sensor may be used so that images can be collectively read in frame units.

Functional block diagram of film image input device Block diagram of the image processing unit Illustration of reading condition setting Flow chart showing operation of film image input device

Explanation of symbols

1: Light source (halogen lamp)
2: Mirror tunnel 3: Slit 4: Imaging lens unit 5: Linear CCD sensor 6: Amplifying means (amplifying circuit)
7: Sample hold circuit 8: Quantization means (A / D converter)
9: Film carrier 10: Image input unit 20: Image input control unit (reading control means)
30: Image processing unit 40: Reading condition setting unit (reading control means)

Claims (7)

An image input unit comprising: a solid-state imaging device; an amplifying unit that amplifies the output signal of the solid-state imaging device; and a quantizing unit that quantizes the output signal of the amplifying unit; and preset by the image input unit The film image is read under the read condition, the read condition is adjusted so that the output level of the amplification means corresponds to the input level range of the quantization means based on the obtained image data, and the film image is read again. A film image input device comprising a reading control means for reading,
The film image input device, wherein the reading control means adjusts the reading condition based on a maximum density difference between a density of an imaged part and an imaged part of image data read under a preset condition.   The reading control unit generates adjustment data of the reading condition in units of frame images for a plurality of frame images read under a preset condition, stores the adjustment data in the adjustment data storage unit, and stores the adjustment data 2. The film image input device according to claim 1, wherein the corresponding frame image is read again after adjusting the reading conditions based on the adjustment data stored in the means.   The reading control unit generates adjustment data of the reading condition for each frame image group specified for a plurality of frame images read under a preset condition, and stores the adjustment data in the adjustment data storage unit. 2. The film image input device according to claim 1, wherein the corresponding frame image is read again after adjusting the reading conditions based on the adjustment data stored in the adjustment data storage means.   The reading condition is the offset and gain of the amplifying unit, and the offset and gain so that the maximum density difference between the density of the imaging region and the density of the non-imaging region of the image data corresponds to the input level range of the quantization unit. The film image input device according to any one of claims 1 to 3, wherein the adjustment is made.   The reading condition is an offset and a gain of the amplifying unit, and a maximum density difference between any of the RGB densities of the imaged region of the image data and any of RGB of the unexposed region is an input level range of the quantizing unit. The film image input device according to claim 1, wherein the offset and the gain are adjusted so as to correspond to the above.   The reading condition is the offset and gain of the amplification means, and the maximum density difference between the RGB density of the imaging part of the image data and the density of the non-imaging part corresponding to the color is the input level of the quantization means The film image input device according to claim 1, wherein the offset and the gain are adjusted so as to correspond to the range.   The film image input apparatus according to claim 1, wherein the density of the imaging region is obtained for an area having a predetermined pixel size or more.

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