Abstract: A paper type determination device of the invention drives plural light emitting points different from one another and having sequentially increasing distances from a reference point to emit light in such a manner that each is identified for irradiating one surface of a sheet of paper subjected to determination. A photodetection device set at a specific detection field of view having the center at the reference point is disposed on the other surface side of the sheet of paper, and it receives light having passed through the sheet of paper from the respective light emitting points at positions on inside and outside of the detection field of view to detect intensity of light for each light emitting point. A diffusing characteristic of the sheet of paper is obtained on the basis of the intensity of light from each light emitting point detected by the photodetection device, and a paper type is determined on the basis of the diffusing characteristic.

Abstract: Provided is an image forming apparatus in which the image forming apparatus has a marginless mode in which the toner image is formed on said image bearing member in an area that covers the recording material and an area outside the recording material, and the toner image is transferred to extend beyond an edge of the recording material carried by said recording material carrying member, the image forming apparatus further including: a detecting device which detects the toner image that extends beyond the edge of the recording material and is transferred to said recording material carrying member in the marginless mode; and a control device which uses a detection result provided by said detecting device to control where said exposure device forms a latent image on said image bearing member.

Abstract: A toner image transfer assembly has a tacking assembly, an image transfer assembly, and a media transport assembly. The tacking assembly senses critical properties of media while electrostatically tacking media to a transport device. The tacking assembly forwards data corresponding to the sensed electrical properties to the image transfer assembly so that the image transfer assembly anticipates the electrical properties of an approaching media type.

Abstract: An image-forming device includes: an image-forming unit; a sheet discharge unit; a sheet support unit; and a reading unit. The image-forming unit forms images on a recording sheet. The sheet discharge unit discharges, in a sheet discharging direction, a recording sheet formed with an image by the image-forming unit. The sheet support unit is disposed above the image-forming unit, and supports sheet discharged from the sheet discharge unit. The reading unit is disposed above the sheet support unit, with an underside surface of the reading unit opposing a top surface of the sheet support unit. The sheet discharge unit is configured to discharge the sheet diagonally upwardly so that sheet discharged by the sheet discharge unit contacts the underside surface of the reading unit.

Abstract: An image forming apparatus, comprises an image forming section, a transfer section to transfer the toner image onto a recording material; and a fixing device to fix the toner image onto the recording material; wherein the image forming section includes a plurality of color image forming sections and a transparent image forming section, and the plurality of color image forming sections and the transparent image forming section are arranged such that the transparent image is transferred so as to form a transparent image layer on an outer surface of the color image on the recording material at a fixing time by the fixing device, and wherein an amount of wax contained in the transparent toner is larger than an amount of wax contained in each color toner of the plurality of color toners and smaller than an amount of base resin contained in the transparent toner.

Abstract: In a xerographic printer, a transfer station is controlled to apply a constant current to the photoreceptor. A print sheet having a high moisture content will cause the control system to make a high voltage drain to maintain the constant current. A signal related to the voltage drain is used to control a decurler. The system enables the decurler to be controlled on a sheet-by-sheet basis.

Abstract: In a fixing apparatus having a first roller which includes a first heater and a second heater arranged in difference ranges from each other in the direction of rotation axis and an auxiliary heater arranged in a range including the ranges where the first and second heaters are arranged in the direction of rotation axis, and a second roller which is heated by a third heater and nips and carries a sheet in cooperation with the first roller, predetermined timing accompanied by start of fixing processing in the fixing apparatus is determined, and when it is determined that the predetermined timing has been reached, the quantity of power supply to the third heater is reduced and power supply to the auxiliary heater is started.

Abstract: An image forming apparatus includes a plurality of toner-image forming units that receive image data and form electrostatic latent images on image bearing members in accordance with the image data, and form toner images of respective colors by developing the electrostatic latent images, an intermediate transfer member onto which the toner images are transferred, a transfer unit that transfers the toner images of the respective colors onto the intermediate transfer member, a controller that performs transfer control for changing a transfer pressure applied when the transfer unit transfers the toner images onto the intermediate transfer member, and a misregistration detector that detects a difference of a transfer position of each of the toner images of the respective colors on the intermediate transfer member when the transfer control is performed by the controller.

Abstract: An image forming apparatus includes an image bearing member and a toner image forming device forming a toner image on the image bearing member, using light toners, and dark toners which have a same hue as that of the light toners and are darker than the light toners. The apparatus forms images using first and second settable resolution grades.

Abstract: The present invention provides an apparatus for discriminating the type of recording material. The apparatus comprises a component irradiating a piece of recording material with light, a sensor picking up an image of the recording material surface by receiving light reflecting off the recording material, a component converting the picked-up image into image data having a plurality of pixels arranged in a predetermined direction and a calculation component integrating the respective density difference values between a first pixel and a second pixel of the plurality of pixels. The apparatus discriminates the type of recording material based on the integrated value of the density values calculated by the calculation component. Furthermore, the present invention provides an apparatus for setting image formation requirements of an image formation component based on the integrated value of the respective density difference values between a first pixel and a second pixel of pixels.

Abstract: An image forming apparatus includes an image carrier that carries an image and rotates, a transfer member that rotates in contact with the image carrier and transfers an image formed on the image carrier to a recording medium, a conveying unit that conveys the recording medium to a contact position where the image carrier and the transfer member come into contact with each other, and a gap forming unit that forms a gap between the image carrier and the transfer member at the contact position. The gap forming unit forms the gap immediately before the recording medium enters the contact position.

Abstract: In a second mode to form an image based on a pre-designated type of recording medium, a detection is performed to a recording medium which is fed, and in a first mode to form an image based on the detected type, image forming conditions are set based on a result of the sheet type detection in the second mode without executing the sheet type detection.

Abstract: An image forming apparatus for forming a visual image on a recording medium includes a toner replacing device that replaces toner stored in a developing device with fresh toner, and a determiner that determines if a recording medium selected by a user necessitates replacement of the toner. The toner replacing device replaces the toner with fresh toner when the determiner determines that the recording medium necessitates replacement of the toner before the latent image is formed on a photoconductive member.

Abstract: An image forming apparatus according to an aspect of the present invention includes a fixing/pressurizing roller pair that nips a transfer sheet and transports to fix toner on the transfer sheet; a pressure control unit that controls a pressure demonstrated by the fixing/pressurizing roller pair in consideration of the type of the transfer sheet; a transfer sheet compatibility determining unit that determines whether or not the pressure set by the pressure control unit is compatible with the transfer sheet to be inserted between the fixing/pressurizing roller pair; and a control unit that performs a process to cause to notify a user of incompatibility and/or a process to forbid printing if the transfer sheet compatibility determining unit determines that the pressure set by the pressure control unit is not compatible with the transfer sheet.

Abstract: A ROM (18) stores image forming driver information associated with a plurality of size groups into which a plurality of sets of sheet sizes close to each other are respectively sorted. When a sheet size of an image transfer sheet designated by an operator through an operating section (19) and a sheet size of an image transfer sheet detected by an image transfer sheet sensor (21) are different from one another, but both of the image transfer sheet sizes fall in the same size group, a CPU (15) allows an image forming section (16) to execute an image forming processing in accordance with image forming driver information corresponding to the image transfer sheet size designated by the operating section (19).

Abstract: In an image forming apparatus, an electrostatic latent image formed on a surface of a photoreceptor is developed into a toner image. A printing paper transported on a transport belt is brought into contact with the surface of the photoreceptor and an electric field is applied to the printing paper from a rear surface of the transport belt by a transfer roller to transfer the toner image onto the printing paper. The transfer roller applies different levels of electric field to the printing paper, so that a predetermined transfer electric field is applied to a region other than a leading edge of the printing paper being transported. An electric field weaker than the predetermined transfer electric field is applied to the leading edge. Even in the presence of a projection generated when the printing paper is cut, the printing paper naturally strips off from the surface of the photoreceptor.

Abstract: According to a method and apparatus for controlling a voltage of an image forming apparatus, a transferring roll resistance, which indicates the resistance between a transferring roller and a photoconductor drum, is detected by applying a first voltage to the transferring roller. A transferring voltage, which corresponds to the detected transferring roll resistance, is applied to the transferring roller with reference to a transferring table which corresponds to the paper resistance, and a transferring is performed on a printing paper by using a transferring roller to which a transferring voltage is applied.

Abstract: An image forming apparatus includes a fixing unit having a rotary heating member and a rotary pressure member forming a nip therebetween, a guide wall positioned immediately downstream of the fixing unit and on the side of the rotary heating member with respect to a boundary defined by the transfer medium passing the nip, a guide member positioned on the side of the rotary pressure member with respect to the boundary and face to face with the guide wall, the guide member and the guide wall cooperatively guiding the transfer medium discharged from the fixing unit, and a guide member positioning mechanism for shifting the guide member between a first position where the guide member is moved away from the guide wall and a second position where the guide member is moved closer to the guide wall than at the first position.

Abstract: Apparatus and methods for adjusting a skew angle of an LED array in the second of dual/tandem print engine systems to compensate for shrinkage of the printable medium exiting the first print engine. Features and aspects hereof provide for manually and/or automatically measuring the shrinkage of the printable medium as it exits the first print engine and for automatically and/or manually adjusting the skew angle of the mounting of the LED array in the second print engine. The image data applied through the LED to the corresponding photoconductor of the second print engine is similarly skewed to match the skew angle of the LED array. Thus a substantially normal bitmap image is applied through the skewed LED to the photoconductor of the second print engine shrunk in the width dimension. Visual artifacts and anomalies from the mathematical approximations and rounding are visually imperceptible at sufficiently high resolutions.

Abstract: With respect to principal papers distributed in the market and used in an image forming apparatus, a boundary between grammage ranges is set at the center of a section where neighboring grammage values of paper has a large difference, and an image is formed under optimum image forming conditions in accordance with the determined grammage range.

Abstract: An apparatus operable to perform printing and connected to a control apparatus includes a storage unit configured to store paper information including paper identification information and paper attribute information, an identification unit configured to identify alternate paper information corresponding to paper information from the paper information stored in the storage unit based on paper attribute information included in the paper information corresponding to identification information transmitted from the control apparatus, and a transmission unit configured to transmit identification information included in the alternate paper information identified by the identification unit as alternate identification information to the control apparatus.

Abstract: An image forming apparatus including: an image bearing belt that bears an image; an image creation unit that transfers the image on the image bearing belt; a first driving source; a driving roller that is rotationally driven by the first driving source and causes the image bearing belt to move; a transfer roller that has a concaved portion in a circumferential surface, forms a transfer nip by the transfer roller making contact with the image bearing belt, and transfers the image on the image bearing belt to a recording material; a second driving source that rotationally drives the transfer roller; a material type determination unit that determines a type of the recording material; and a control unit that controls a number of rotation of the transfer roller when the recording material is nipped by the transfer nip based on information of the type determined by the material type determination unit.

Abstract: A length measurement apparatus including: a measurement portion that measures a sheet length based on a rotational amount of a length measurement roll for a first detection period in which first and third sensors detect the sheet, and a sheet length based on a rotational amount of the length measurement roll for a second detection period in which the second sensor and any one of the first and third sensors detect the sheet, the any one of the first and third sensors being disposed at a position opposite to the second sensor via the length measurement roll; and a whole length calculation portion that selects the sheet length nearer to integral multiples of the circumference length of the length measurement roll from the sheet lengths measured for the first and second detection periods, and calculates the whole length of the sheet by using the selected sheet length.

Abstract: The sheet thickness detector includes a fixed member, a displacement roller disposed opposite the fixed member and movable in such a linear direction as to be contacted with or separated from the fixed member when the sheet passes through a nip therebetween, bearings rotatably supporting a shaft of the displacement roller, a displacement member movable in the linear direction in conjunction with the displacement roller and integrated with at least one of the bearings, and a displacement sensor operatively connected to the displacement member and detecting displacement of the displacement member. The thickness of the sheet passing through the nip is determined based on the amount of displacement of the displacement member.

Abstract: An image forming apparatus includes an exposure mechanism to form a latent image by exposure, a latent-image carrier to hold the latent image, a charging mechanism to charge the latent-image carrier evenly, a development device to develop a latent image on the latent-image carrier into a toner image, a transfer mechanism to transfer the toner image formed on the latent-image carrier onto a transfer material, at least one asperity profile reading mechanism to read an asperity of an entire image area of the transfer material at least in a width direction thereof onto which a toner image is to be transferred, and a control mechanism to adjust a toner adhesion amount of the toner image transferred to the transfer material in accordance with a localized asperity of a surface of the transfer material read by the asperity profile reading mechanism.

Abstract: In a second mode to form an image based on a pre-designated type of recording medium, a detection is performed to a recording medium which is fed, and in a first mode to form an image based on the detected type, image forming conditions are set based on a result of the sheet type detection in the second mode without executing the sheet type detection.

Abstract: An image forming apparatus that enables a post-processing apparatus to perform optimum control in accordance with the type (thickness) of sheet. A user sets on an image forming apparatus main unit 10 a thickness of sheet to be conveyed. A CPU circuit section 150 obtains first thickness-determination information used for the sheet conveying speed control in a finisher 500 from the finisher 500. A plurality of candidate sheet thicknesses that can be set, are determined based on the first thickness-determination information obtained by the CPU circuit section 150 and second thickness-determination information used when image-forming process speed control is performed in the image forming apparatus main unit 10 according to sheet thickness.

Abstract: An image forming device that uses only one temperature sensor to detect temperatures of the recording sheet and a rotation member for fixing, and can perform the temperature adjustment control carefully in detail during the image forming operation. The CPU 61 performs the temperature adjustment control 1 by executing the temperature adjustment program 64b (step S109), then executes the paper passing judgment program 64a to judge whether or not paper is passing (step S110). As far as it judges that no paper is passing (NO in step S110), the CPU 61 continues to perform the temperature adjustment control 1 by executing the temperature adjustment program 64b. When it judges that paper is passing (YES in step S110), the CPU 61 performs the temperature adjustment control (step S112).

Abstract: Systems and methods apply active feedback via a repetitive controller to compensate for periodic disturbances applied by recording media to a movable image carrier having a controlled velocity. The compensation parameters of the repetitive controller, once the error signal of the feedback converges to zero, can be stored with one or more characteristics of the print job or the recording media used for the print job. When other print jobs are received having the same one or more characteristics, the stored, converged compensation parameters can be retrieved, reducing the time to convergence of the systems and methods.

Abstract: An image forming apparatus includes a belt member which bears a toner image, a transfer portion for forming a transfer nip portion, a changing unit for changing an advancing angle of the belt member advancing into the transfer nip portion, a guide member which is arranged at an upstream side of the transfer nip portion in a recording material conveying direction and face to a untransfered face of the recording material and guide a recording material to the transfer nip portion, and a controller for controlling the changing unit so that a belt face advancing into the transfer nip portion and conveying a recording material having a first thickness is at a position farther from the guide member than the belt face advancing into the transfer nip portion and conveying a recording material having a second thickness smaller than the first thickness.

Abstract: An ICC profile includes brief gloss information indicating glossy/matte attribute as attribute information, however, gloss matching cannot be performed with the 2 options. In a case where embedding of glossiness information into the ICC profile is designated, glossiness information is obtained from a color chart placed on an original plate of a color copier, and the obtained glossiness information is described in a private tag of the ICC profile.

Abstract: An image forming apparatus according to an embodiment of the present invention includes an apparatus main body, an image creating unit that is provided in the apparatus main body and creates an image to be printed on recording paper, a paper feeding mechanism on which plural pieces of the recording paper are stacked as a paper bundle, a paper-type distinguishing device that distinguishes a type of the recording paper from the paper bundle stacked on the paper feeding mechanism, and a printing unit that prints, according to the type of the recording paper distinguished by the paper-type distinguishing device, the image created by the image creating unit on the recording paper.

Abstract: A sheet length measurement apparatus including: a rotating member that comes in contact with a recording sheet conveyed on a conveying path, and rotates along with the conveyance of the recording sheet; a rotation amount detector that detects a rotational amount of the rotating member; a fixing support member that fixedly supports an rotating shaft of the rotating member at a fixed position; an opposed member that is disposed opposite to the rotating member so as to hold the recording sheet between the rotating member and the opposed member, the opposed member being disposed so that the rotating member rotates along with the conveyance of the recording sheet; and a support member that supports the opposed member in a movable state in a direction to separate from or come in contact with a surface of the recording sheet.

Abstract: In the image forming apparatus according to the invention, a fixer fixes toner on the sheet and presses the sheet, and a media sensor measures a thickness of the sheet before pressurization and a thickness of the sheet after pressurization. Then, by calculating an amount of heat used if the fixer fixes the toner on the sheet on the basis of the measurement result, a control unit is able to control the temperature of the fixer on the basis of the calculated amount of heat. In this manner, it is possible to appropriately calculate an amount of heat per unit area required to fix toner on the sheet.

Abstract: A paper type determination device of the invention drives plural light emitting points different from one another and having sequentially increasing distances from a reference point to emit light in such a manner that each is identified for irradiating one surface of a sheet of paper subjected to determination. A photodetection device set at a specific detection field of view having the center at the reference point is disposed on the other surface side of the sheet of paper, and it receives light having passed through the sheet of paper from the respective light emitting points at positions on inside and outside of the detection field of view to detect intensity of light for each light emitting point. A diffusing characteristic of the sheet of paper is obtained on the basis of the intensity of light from each light emitting point detected by the photodetection device, and a paper type is determined on the basis of the diffusing characteristic.

Abstract: An image forming apparatus of the invention conveys paper fed by a paper feeding mechanism piece by piece to a paper discharging unit through a paper conveying path. An image forming unit is arranged in a midway portion of this paper conveying path and executes an image forming process for printing an image based on image data on paper being conveyed. A sensor that detects a type of the paper conveyed is arranged on an upstream side with respect to the image forming unit on the paper conveying path. Image forming process conditions for the image forming unit are set in accordance with a detection result of the sensor. When the paper fed to the paper conveying path is paper not detected by the sensor, the image forming process is started awaiting a detection result by the sensor. On the other hand, when the paper is detected by the sensor, the image forming process is started without awaiting paper type detection.

Abstract: A fixing apparatus includes a control circuit which controls the electrifying to a first heater so that a temperature detected by a first temperature detection portion reaches a first target temperature and controls the electrifying to a second heater so that a temperature detected by a second temperature detection portion reaches a second target temperature, when warm-up is initiated, and, when the warm-up initiated, if an initial temperature of a rotary member is below a predetermined temperature, the control circuit sets the first target temperature to a temperature value greater than the first target temperature set when the initial temperature of the rotary member is greater than the predetermined temperature and sets the second target temperature to a temperature value greater than the second target temperature set when the initial temperature of the rotary member is greater than the predetermined temperature.

Abstract: Information (particularly, water content) of a sheet material which changes during progression of processing is estimated with higher accuracy and information output or (image formation) processing is performed. The water content estimation method of the present invention includes: detecting a first information regarding moisture contained in a sheet material; detecting a second information regarding a factor affecting information regarding the moisture contained in the sheet material; predicatively computing an estimation of a water content of the sheet material based on the first information and the second information; and adjusting processing conditions for image formation based on the estimation of the water content which is computed.

Abstract: With respect to principal papers distributed in the market and used in an image forming apparatus, a boundary between grammage ranges is set at the center of a section where neighboring grammage values of paper has a large difference, and an image is formed under optimum image forming conditions in accordance with the determined grammage range.

Abstract: An image forming apparatus includes a rotatable image bearing member for bearing a toner image; a transfer member constituting a transfer portion for transferring the toner image formed on said image bearing member onto a recording material; a voltage source for applying, to said transfer member, a voltage in the form of superimposed DC voltage and AC voltage; controller for controlling said voltage source such that a duty ratio, in the AC voltage, of a component increasing an absolute value of a transfer voltage is less than 50%; and an executing portion for executing an operation in an image forming mode in which the toner image is transferred from said image bearing member onto the recording material with the duty ratio controlled by said controller correspondingly to a kind of the recording material.

Abstract: A transfer device comprising: a transfer section which forms a nip portion between the transfer section and an image carrier and transfers a toner image on an image carrier onto a sheet passing through the nip portion; an application section which applies a voltage to the transfer section; a determining section which determines a timing of applying voltage from the application section to the transfer section, wherein the control section controls the application section to apply a voltage having an opposite polarity to a transfer polarity to the transfer section until the timing determined by the determination section in a period since a leading edge of the sheet in a conveyance direction advances into the nip portion until a predetermined non image area of the sheet has passed through the nip portion, and then, at a timing determined, switch to apply a voltage having the transfer polarity.

Abstract: A fuser and receiver release system and method are provided for improving the release of receivers in high speed of printing systems. This system controls the release of a receiver in conjunction with a fuser in a printing system, and specifically the efficiency and accuracy of the release system. One embodiment of this method includes a belt fuser that allows the separating of the heat transfer and release functions of the fuser such that fuser roller could be made of hard metal core that can be heated to high temperatures without the fear of delaminating elastomeric coatings which are common in roller fusing.

Abstract: A multi-functional sensor for deriving information on a recording sheet material comprising an impact-applying unit for applying an external mechanical force onto the recording sheet material, a signal-detecting unit for detecting a signal of response of the recording sheet material to the external mechanical force, a signal-processing unit for processing the signal, and a signal-judging unit for deriving a property of the recording sheet material by comparison of a signal from the signal-detecting unit or the signal processing unit with information memorized preliminarily, wherein the signal-processing unit comprises a separation section for separating the signal from the signal-detecting unit into output signals on the properties of the recording sheet material, and a processing section for deriving, by statistical treatment, a correlation equation showing a correlation between the separated output signal and the properties of the recording sheet material.

Abstract: An image forming apparatus includes a controller which sets fixing conditions in a fixing unit in accordance with the type of printing medium sensed by a sensor. An intermediate transfer member and sensor are configured as an intermediate transfer member unit. The intermediate transfer member unit is removably installed in the main body of the image forming apparatus. The intermediate transfer member unit has a storage unit which stores information used to determine the type printing medium by the sensor.

Abstract: An image forming apparatus includes a charging unit, an image carrier, an exposing unit, a developing unit, a transfer belt on which the transfer material is placed, a fixing unit that fixes the toner image transferred onto the transfer material, a cleaning unit that cleans up toner attached to the fixing unit, and a control unit that controls printing of the image on the transfer material. The control unit causes the exposing unit to expose a latent image of a first image having an image-area ratio equal to or larger than a predetermined ratio, causes the developing unit to form a toner image of the latent image and to transfer the toner image to the transfer material, and causes the fixing unit to fix the toner image transferred by the transfer belt to the transfer material.

Abstract: An image-forming device includes a media path extending through the image-forming device, and at least one image transfer nip positioned along the media path. An electrode is positioned subsequent to the nip with respect to the media path and is coupled to a voltage source. An electric field produced by the electrode and voltage source limits the degree of post-nip toner scattering by applying an electrostatic force to toner particles on media sheets passing along the media path. The image-forming device further includes a processor for monitoring a plurality of ambient conditions, for adjusting the voltage applied to the electrode, and optionally, for repositioning the electrode with respect to the media path.

Abstract: In a fixing unit, a fixing roller is rotated under driving force transmitted from a paper discharge unit-side gear of a driving section via a fixing roller driving gear, and holds and conveys a recording medium in cooperation with a pressure roller in a nip region. When a control section determines that acceleration conditions are fulfilled, the driving section increases the rotating speed of the paper discharge unit-side gear so that it is rotated at higher speed than before-acceleration speed over predetermined high-speed rotating period.

Abstract: When the image forming device receives a print job including a print condition in its header, an operation control section extracts the print condition from the header, and makes an inquiry to a server. The server extracts an order table, indicative of a priority based on the extracted print condition, from a setting table in which a priority of sheets has been set in advance in accordance with the extracted print condition, and sends the order table by return to the image forming device. In the image forming device, a tray selection section generates a tray selection signal in accordance with the received order table and a detection signal, outputted from a tray detection section, which functions as sheet storage information of a sheet feeding tray section, so as to send the tray selection signal by return to the sheet feeding tray section.

Abstract: An effective image area can be properly corrected in accordance with the quantity of light from an irradiation unit by selecting, as the effective image area, pixels having light quantities more than or equal to a threshold value that allows accurate acquisition of a surface image of a recording medium, on the basis of a light quantity distribution of the light from the irradiation unit. This reduces the influence of mounting accuracy of the irradiation unit, and allows the recording medium to be identified accurately.

Abstract: An image of stabilized tint is output even if a supplied transfer medium is changed to a transfer medium of a different surface gloss or type of paper. If the supplied transfer medium has changed, the tint of a corrective image formed on the transfer medium is sensed, a tint correction of an image forming portion is performed based upon result of sensing, and corrective data of the tint correction and information relating to the transfer medium is stored. If a change of the transfer medium is sensed subsequently, a determination is made as to whether the transfer medium is substantially the same transfer medium, based upon the stored information relating to the transfer medium. If the transfer medium is substantially the same, then image processing is executed based upon the stored corrective data.