Abstract: Fiber optic devices, methods for producing same, and uses of such optical devices are provided. The method includes combining light conducting rods to form bundles in accordance with predefined rules with respect to a cross-sectional area and number thereof in relation to a surrounding sheath, and are subjected to a drawing process. The strong fiber rod produced by the drawing process has an approximately hexagonal outer shape, and due to the drawing process the light conducting rods also have an approximately hexagonal outer contour. Thereby, a high packing density of about 99% is achieved in the fiber rod. Through a further process sequence of bundling and drawing these fiber rods, high-resolution multi-fiber rods are produced that include several thousand light conducting rods, the diameter of an individual light conducting rod included therein being less than 100 ?m.

Abstract: The present invention relates to a GI-type multi-mode optical fiber in which the outer diameter of the core is 47.5 to 52.5 ?m or 60 to 65 ?m, or to a bend resistant multi-mode optical fiber provided with resistance against property fluctuation caused by the bending of the multi-mode optical fiber by providing a trench portion having a low refractive index at the outer periphery of the core. In the multi-mode optical fiber, both the maximum tensile stress and the maximum compressive stress in the optical axis direction remaining in the core are 50 MPa or less.

Abstract: A low-loss optical fiber over wide wavelength range includes a transmission loss of less than or equal to 40 dB/km in a whole wavelength range of 400-1400 nm, and being manufactured by drawing an optical fiber preform including a core composed of a silica glass having a hydroxyl-group concentration of less than or equal to 1 ppm and a cladding composed of a silica glass having a fluorine concentration of more than or equal to 3.2 wt %.

Abstract: A multi-core optical fiber has: a plurality of core portions; a cladding portion that is positioned around each of the plurality of core portions and has a refractive index lower than that of each of the plurality of core portions; and a separation distance between adjacent ones of the plurality of core portions being set so that crosstalk of light between the adjacent core portions over an entire length thereof becomes ?15 dB or greater at a wavelength of 1550 nm and a cable cut-off wavelength becomes 1530 nm or less.

Abstract: A radiation curable composition is disclosed that includes a curable cross-linker essentially free of urethane and urea functional groups, a curable diluent, and a non-radiation curable component comprising (thio)urethane and/or urea groups. Coated optical fibers having a primary coating formed from this radiation curable composition, as well as optical fiber ribbons that contain the coated optical fibers are disclosed. Methods of making the optical fibers and ribbons are also disclosed.

Abstract: The present disclosure provides a one-piece optical fiber adapter that includes a main body and a hook member. At least one first stop block is positioned on the first wall and at least one second stop block is positioned on the third wall. Two first hooks extend respectively from the second and fourth walls toward a direction of the second opening of the accommodation room. The hook member is positioned within the accommodation room of the main body and includes two second hooks, at least one third hook and at least one fourth hook. The third and fourth hooks extend respectively from the fifth and seventh walls toward a direction of the fourth opening of the accommodation room of the hook member to hook on to the first and second stop blocks, respectively.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for recording and publishing content on social networking websites and other websites include providing an imbedded link on a social networking webpage to media recorder software stored on an external server system, invoking the media recorder software within a displayed instance of the social networking webpage through an application programming interface for the social networking webpage, receiving a video stream defining video captured using the media recorder software at the external video management server system, generating and storing a video file using the received video stream at the external server system, selecting the stored video file for distribution via one or more communication networks, and providing the stored video file for display within displayed instances of webpages hosted on external web server systems.

Abstract: Processes (and related devices) for capturing and/or reproducing multimedia contents include, in the capturing stage, the steps of: acquiring a multimedia content in the form of a generally time-variable multimedia stream through video acquisition means and possibly also audio acquisition means; acquiring data related to the capturing conditions of the multimedia content (capture parameters) through dynamic monitoring means for monitoring the conditions; storing values dependent on the generally time-variable capture parameters into predetermined areas of the multimedia file associated with the captured multimedia content in the form of dynamic metadata for acquiring the multimedia content; and/or including, in the reproduction stage, the steps of: reading from a memory at least the multimedia file including at least one multimedia content; reading data related to the capturing conditions of the multimedia content (capture parameters) in the form of at least one dynamic metadatum associated with the multimedi

Abstract: A method for recording moving images via a camera system includes detecting a rotation state of a device and setting an image rotation angle in image record mode, rotating images acquired via a camera module by the set image rotation angle, and encoding and storing the rotated images.

Abstract: A method of controlling a mobile terminal, and which includes outputting, via a display of the mobile terminal, a first video; detecting, via a controller of the mobile terminal, an occurrence of an event on the mobile terminal; and automatically displaying or not displaying a first language caption corresponding to the first video in response to the detected event.

Abstract: An information processing apparatus includes an operation information holding unit, an attribution obtaining unit, and an operation information presentation unit. The operation information holding unit is configured to hold operation information for each attribution of content. The attribution obtaining unit is configured to obtain an attribution of reproduction content that is content being reproduced. The operation information presentation unit is configured to present operation information corresponding to the reproduction content based on the attribution.

Abstract: In a method for adjusting a timestamp of a video recorder, a system time of the video recorder and a timestamp of a previous frame recorded by the video recorder are loaded when the video recorder records a new frame. The method determines whether the system time is after the timestamp, and adjusts the system time for a timestamp of the new frame when the system time is after the timestamp of the previous frame. The method further adjusts a time which is the timestamp of the previous frame with an addition of a preset time shift for the timestamp of the new frame when the system time is not after the timestamp of the previous frame, and saves the timestamp of the new frame into a storage device.

Abstract: A main stream contains successive content elements of video and/or audio information that encode video and/or audio information at a first data rate. A computation circuit (144) computes main fingerprints from the successive content elements. A reference stream is received having a second data rate lower than the first data rate. The reference stream defines a sequence of the reference fingerprints. A comparator unit (144) compares the main fingerprints with the reference fingerprints. The main stream is monitored for the presence of inserted content elements between original content elements, where the original content elements have main fingerprints that match successive reference fingerprints and the inserted content elements have main fingerprints that do not match reference fingerprints. Rendering of inserted content elements to be skipped. In an embodiment when more than one content element matches only one is rendered.

Abstract: A method and apparatus for storing and displaying information about the capture and/or transfer of digital media is provided, wherein data is stored such that a visual representation indicating characteristics of video data, such as whether portions of the video data have been transferred to another device or captured to a storage device, may be generated and displayed.

Abstract: An image processor for processing image data includes: a reproducing operation limit signal generator configured to generate a reproducing operation limit signal for denoting a reproducing operation limit of the image data based on data added to the image data; and a 2D to 3D converter configured to convert the image data to a pseudo-3D image. The 2D to 3D converter is configured to control valid and invalid of an operation of converting the image data from the 2D image to the pseudo-3D image based on the reproducing operation limit signal.

Abstract: The present technology relates to a display control method, a recording medium, and a display control device with which a subtitle forced display function can be implemented on the basis of TTML (Timed Text Markup Language). TTML data in which predetermined attribute information pertaining to subtitle forced display is described in a tag defining an element of text is used. At a content playback side, control is performed on the basis of the predetermined attribute information in the TTML data, in such a way that characters based on text data designated by the tag in which the attribute information is written are displayed on a display unit regardless of whether a subtitle display setting is ON or OFF. Owing to this kind of configuration, text data serving as a predetermined text element from among text elements (text data serving as subtitles) within the TTML data can be displayed regardless of whether a subtitle display setting is ON or OFF.

Abstract: A method for acquiring and storing data relating to video streams selectable on a video processing apparatus adapted to select a video stream reproducible on an associated reproduction device includes: identifying the source of the video stream by identification data, the video stream having a coding and transport configuration adapted to produce a three-dimensional display; verifying if, for the identified video stream, any data relating to the coding and transport configuration of the video stream are stored by the video processing apparatus in storage of the video processing apparatus including associations between video stream identification data and video stream coding and transport configurations; when affirmative, acquiring from the storage the coding and transport configuration associated with the video stream identified by the identification data, and using the data for a following selection of the video stream in order to reproduce the selected video stream on an associated video reproduction device

Abstract: Embodiments of the disclosed invention include a system and method for recording media content. For example, in one embodiment, a method for recording media content is disclosed that includes communicating with a home gateway to determine whether a device connected to the home gateway has enough free storage space to store a media content in response to a determination that an internal data storage unit of a set top box does not have sufficient free storage space to store the media content. In one embodiment, the method routes the storage of the media content to the device via the home gateway in response to a determination that the device connected to the home gateway has sufficient free storage space to store the media content.

Abstract: To enable a utilization frequency of each segment in a source video to be readily assessed between videos in a corresponding relationship during a creation process. Relationship information that is information indicating a segment in a corresponding relationship between a source video and a plurality of derived videos created using at least a part of segments of the source video is stored in a relationship information storing unit, and a corresponding relationship of the segment between the source video and the plurality of derived videos and a utilization frequency of each segment of the source video by the plurality of derived videos are displayed based on the relationship information stored in the relationship information storing unit.

Abstract: A method is provided in one example and includes receiving an indication of a start of a point of interest associated with a portion of a video presentation, and determining a start time relative to a start time of the video presentation. The method further includes receiving an indication of an end time of the point of interest, and determining an end time of the point of interest relative to the start time of the video presentation. The method still further includes generating point of interest data that includes the start time and end time of the point of interest, and sending the point of interest data to a processing device. The processing device generates a composite point of interest video including the portion of the video presentation associated with the point of interest.

Abstract: A hot air generator comprising a handle (12), an elongated nozzle (14), flame generating means (6), a venturi (4), a gas conduit (162) intended to bring a combustible gas into the elongated nozzle (14) and at the flame generating means (6), an air conduit (164) intended for bringing compressed air into the elongated nozzle (14) and downstream from the venturi; characterized in that the generator further comprises a servocontrolled pressure regulator (2) controlling a 15 gas pressure (Pd.g) in the gas conduit (162) depending on an air pressure (Pd.a) in the air conduit (164).

Abstract: A heating device for an electric water heater, especially a heating device that can effectively recover waste heat, the device includes a secondary water box provided on one of the top and the bottom sides of a flat type main water box, the secondary water box is communicated with the main water box to guide water of the secondary water box into the main water box; the main and the secondary water boxes are provided therebetween with a laminate electric heating board of which the top and the bottom sides are clung respectively to the secondary water box and the main water box, an effect of preheating the water in the secondary water box is obtained to thereby effectively use the waste heat for saving energy source, and heating efficiency can be increased.

Abstract: Provided is a fluid heating device that is small in size and capable of heating a large flow of gas or liquid at a low cost. A flow path in which no backwater is produced is provided by providing grooved flow paths of a fluid are provided over an outer side surface of a metallic circular cylinder such that a fluid passing through a narrowed one of the flow paths impinges perpendicularly against a wall of the next flow path. This allows instantaneous heat exchange within a small space, and makes manufacturing of such a structure simple.

Abstract: A moving body photographing system, apparatus, method and program wherein an individual can easily take a photograph while operating the moving body. A portable terminal moves together with a moving body and includes a moving body photographing module for inputting a condition when the moving body is to be photographed to reserve photographing. A wireless communication section and a moving body communication section transmit information representing the inputted condition and representing a position of the portable terminal to a management apparatus and a photographing apparatus. The management apparatus and the photographing apparatus include a wireless position measurement section for measuring a position of the moving body moving together with the portable terminal. A camera apparatus is provided for photographing the moving body in accordance with a condition inputted to the portable terminal based on the position information of the moving body measured by the moving body position measurement means.

Abstract: A device for rotatably mounting a camera on a person carrying a bag comprises a body with lateral flaps on opposite sides thereof. The lateral flaps are foldable along lines of weakness to allow the device to hug a strap of the bag. A female connector is disposed on the body and has a U-shaped slot defined by a curved pocket and a pair of opposed channels which extend from the pocket. The male connector has a plate and threaded member extending from the plate. The threaded member is for engaging a threaded female tripod receiver of the camera extending from the plate. The plate is slidably received by the U-shaped slot of the female connector and the plate is freely rotatable within the U-shaped slot of the female connector.

Abstract: A railway for an overhead camera surveillance system comprises a track comprising a plurality of flexible track segments joined end-to-end, the track being configured to define at least one rail along which at least one motorized camera carriage suspended therefrom is moveable.

Abstract: A camera accessory is detachably mounted at a camera body that includes a first body contact point, a second body contact point, a third body contact point, a fourth body contact point and a fifth body contact point and detects disengagement of the camera accessory when the fifth body contact point sustains a signal level corresponding to a first truth value continuously over a length of time equal to or greater than a predetermined time length. In the camera accessory, the accessory-side communication control device executes control so as to ensure that the signal assuming a level corresponding to the first truth value is not continuously output from the fifth accessory contact point any longer than the predetermined time length while the operating voltage supply from the camera body is provided via the first accessory contact point.

Abstract: An apparatus searches for one or more first routes coupling starting and ending point nodes in a communication network including an asymmetry node, based on topology information indicating a connection relationship between nodes on the communication network. The apparatus determines, for each of the one or more first routes, whether or not signals are transmittable between the starting and ending point nodes under path restriction imposed on the asymmetry node, based on asymmetry-node information indicating the path restriction imposed on the asymmetry node. The apparatus determines a second route that has a minimum sum of link costs among one or more third routes for which it is determined that signals are transmittable between the starting and ending point nodes under the path restriction imposed on the asymmetry node, based on cost information storing a link cost of a link connecting each pair of adjacent nodes on the communication network.

Abstract: The present application is directed to the measurement of the intensity and phase of high speed optical signals. The present application uses a tunable optical local oscillator, an optical coupler, a photodiode and RF electronics. The tunable laser enables successive measurements to be taken across the optical spectrum allowing the system to measure extremely high bandwidth signals. The signal generated by the local oscillator comprises a component at a frequency between two adjacent modes of the periodic optical signal to be measured. The local oscillator and said periodic signal are optically mixed and sent to a photodiode, the measurement of the phase being based on isolating the resulting beat frequencies. This approach offers a significant improvement over existing time resolved approaches which are limited to the bandwidth of the photodiode (˜50 GHz).

Abstract: The present invention includes novel techniques, apparatus, and systems for optical WDM communications. Tunable lasers are employed to generate subcarrier frequencies representing subchannels of an ITU channel to which client signals can be mapped. Client circuits can be divided and combined before being mapped, independent of one another, to individual subchannels within and across ITU channels. Subchannels may be independently routed to a single subchannel receiver filter, such that each subchannel detected at the receiver may come from a different source location. Network architectures and subchannel transponders, muxponders and crossponders are disclosed, and techniques are employed (at the subchannel level/layer), to facilitate the desired optical routing, switching, concatenation and protection of client circuits mapped to these subchannels across the nodes of a WDM network. Subchannel hopping may also be used to increase the optical network security.

Abstract: A wavelength tuning time measurement apparatus and method for a multi-wavelength passive optical network (MW PON) are provided. The wavelength tuning time measurement apparatus for measuring a wavelength tuning time of a wavelength-variable light source included in the MW PON system includes an optical filter configured to pass only light of a certain wavelength bandwidth and a photo detector configured to sense light passing through the optical filter. The wavelength tuning time is a time taken from a time when a wavelength change signal is transferred to the wavelength-variable light source, to a time when light starts to be successively sensed by the photo detector.

Abstract: System for connecting a plurality of digital subscribers to a data network, comprising a local part connected, by an optical fiber link, to a remote part. Said local part comprises a plurality of DSLAM line cards with xDSL over fiber transceiver that, in turn, comprise a plurality of xDSL lines comprising a modified analog front end which comprises an digital-analogue converter to transform a transmitted digital downstream signal into an analogue downstream signal; an oscillator which fixes an oscillation frequency for the xDSL line; a mixer, directly connected to the output to convert the analog downstream signal into the oscillation frequency; and a band pass filter centered at the oscillation frequency which filters the converted analog downstream signal.

Abstract: An optical transmitter includes: an optical modulator configured to generate an optical signal from a plurality of transmission signals; a crosstalk monitor configured to monitor crosstalk between the plurality of transmission signals by using the optical signal; and a crosstalk canceller configured to correct the plurality of transmission signals based on a result of monitoring by the crosstalk monitor.

Abstract: An optical multiplexer/demultiplexer includes a first fiber unit having an MCF and a GRIN lens, a second fiber unit having an MCF and a GRIN lens, and an optical filter. The optical filter is disposed between the GRIN lens of the first fiber unit and the GRIN lens of the second fiber unit and makes transmitted light and reflected light emitted from a core of the MCFs incident on a core of the MCFs. A leading end of the MCF and one end of the GRIN lens are held in contact with each other in the first fiber unit, while a leading end of the MCF and one end of the GRIN lens are held in contact with each other in the second fiber unit.

Abstract: In an automatically switched optical network, the wavelengths are assigned to optical path based on their intrinsic physical performance and on the current network operating parameters. The wavelength performance information is organized in binning tables, based primarily on the wavelength reach capabilities. A network topology database provides the distance between the nodes of the network, which is used to determine the length of the optical path. Other network operating parameters needed for wavelength selection are also available in this database. Once a bin corresponding to the path length is identified in the binning table, the wavelength for that path is selected based on length only, or based on the length and one or more additional parameters. The optical path performance is estimated for the selected wavelength, and the search continues if the estimated path performance is not satisfactory.

Abstract: The invention is about a method and apparatus for grouping multiple satellite transponders with both (LP) polarization formats in different frequencies through Wave-Front (WF) Multiplexing (muxing) techniques for ground terminals with incompatible (CP) polarization formats. As a result of this invention, linear polarized (LP) transponders can be accessed and efficiently utilized by circularly polarized (CP) ground terminals and vice versa. This invention consists of conventional ground terminals, a unique organization of space assets, and a unique polarization alignment processor. The applications of wavefront multiplexing techniques to satellite communications offer many potential advantages, including improved flexibility and utility efficiency of existing space assets. Our proposed “Polarization Utility Waveforms” is an entirely new concept in VSAT and Earth Station Antenna diversity.

Abstract: An optical amplifying apparatus that amplifies a wavelength-division multiplexed (WDM) optical signal includes an input section, a laser light source, a double-clad optical fiber, a gain equalizer, and a residual pump light attenuating section that attenuates a residual pump light outputted from the double-clad optical fiber. The residual pump light attenuating section is disposed such that the residual pump light of the laser light is incident on the residual pump light attenuating section before being incident on an isolator.

Abstract: A circuit board assembly includes a first circuit board, and a second circuit board, a first optical transceiver, a number of first light wave guides, a second optical transceiver, and a number of second light wave guides. The first circuit board defines a number of first through holes. The second circuit board defines a number of second and third through holes. Each of the third through holes is aligned with a respective first though hole. The first optical transceiver is optically coupled with the second through holes. The first light wave guides are mounted on one surface of the first circuit board and optically coupled with the second through holes. The second optical transceiver is optically coupled with the third through holes. The second light wave guides are mounted on another surface of the first circuit board and are optically coupled with the first through holes.

Abstract: A system for transmitting an optical signal between a host and a device according to a SATA protocol. The system comprises a transmitting-side converter for generating a logic one voltage value responsive to a data one value from an information source, for generating a logic zero voltage value responsive to a data zero value from the information source, for generating an idle state logic voltage value, wherein the idle state logic voltage value is (logic one voltage value+logic zero voltage value)/2, the transmitting-side converter comprising only linear functions to preserve the idle state logic voltage value, and an electrical-to-optical converter for converting the logic one, logic zero and the idle state logic voltage values to an optical signal further comprising respective logic one, logic zero and idle state optical values and for supplying the optical signal to an optical communications medium.

Abstract: A dispersion correction circuit is provided for use with an input driving signal. The dispersion correction circuit includes an input portion, an output portion and a filter portion. The input portion is arranged to receive the input driving signal. The output portion can output an output signal based on the input driving signal. The filter portion is disposed between the input portion and the output portion. The filter portion includes a varactor, a DC bias portion, and a transformer. The DC bias portion provides a DC bias to the varactor.

Abstract: A dispersion correction circuit is provided for use with an input driving signal. The dispersion correction circuit includes an input portion an output portion and a filter portion. The input portion is arranged to receive the input driving signal. The output portion can output an output signal based on the input driving signal. The filter portion is disposed between the input portion and the output portion. The filter portion includes a first varactor, a DC bias portion, and a second varactor. The DC bias portion provides a DC bias to the first varactor. The first varactor is arranged in a first polarity direction, and the second varactor is arranged in a second polarity direction that is the same as the first direction.

Abstract: An optical transmission assembly includes a first optical-electrical conversion module, a second optical-electrical conversion module and a optical waveguide connecting the first and the second optical-electrical conversion modules for transmitting optical signals. The first optical-electrical conversion module and the second optical-electrical conversion module each includes a circuit board, an optical signal emitting member, an optical signal receiving member, and a cover. The optical signal emitting member and the optical signal receiving member are mounted on the circuit board. The circuit board defines a positioning groove. The cover includes a latching portion latching with the positioning groove. The cover defines a latching groove. The optical waveguide includes a inserting portion to latch with the latching groove. The present disclosure further provides an optical-electrical conversion module.

Abstract: In order to improve degradation of receiving sensitivity caused by analog characteristics degradation in an optical receiver, the optical receiver includes: the first coefficient computing unit for computing the first equalization filter coefficient for compensating the first waveform distortion caused and formed by an optical transmission path; the second coefficient calculating unit for predetermining the second equalization filter coefficient for compensating the second waveform distortion caused and formed by an analog characteristics degradation of components; a coefficient operating unit for performing operation to the first equalization filter coefficient and the second equalization filter coefficient and outputting the third equalization filter coefficient; and a waveform equalization processing unit including a waveform equalization filter for performing an equalization process to an input signal including the first waveform distortion and the second waveform distortion based on the third equalizatio

Abstract: An optical receiver is provided with a photoelectric converter that outputs an electrical signal according to light that is received by a light-receiving region. The optical receiver is provided with a condensing lens and optical filter that are located in an optical path from where signal light enters towards the light-receiving region. The condensing lens condenses the signal light onto the light-receiving region. The optical filter reflects light having a first wavelength that is included in the signal light using a front surface thereof and reflects light having a second wavelength that is included in the signal light using a rear surface thereof that faces the front surface so that the light is emitted through the front surface.

Abstract: Image recording devices, such as electrophotographic devices, laser printers, copiers, and fax machines, often have a cartridge that utilizes an encoder wheel assembly in addition to or instead of a chip for determining toner load. It may be desirable to alter the encoder wheel or part of the cartridge, either by the printer or the cartridge, to permit a deliberate end of life function situation that requires the replacement of the cartridge, encoder wheel, or encoder wheel assembly components. This thereby controls the remanufacture or replacement of the toner cartridge in a way that is desirable to the manufacturer and prevents unauthorized refilling of the cartridge.

Abstract: An indicator disposed on an openably closable door disposed on a part of an exterior panel includes a light source disposed on a housing positioned in an interior of the door and a diffusion lens disposed on the door and opposed to the light source, wherein the light source is mounted on a support part disposed on the housing so that an optical axis of the light source is coincident with that of the diffusion lens. The door includes a recessed portion including a retainer, and the diffusion lens is supported in the recessed portion with the retainer pressing an external surface of the diffusion lens entirely so that the light from the light source is prevented from leaking from the surface of the door.

Abstract: An image forming apparatus that is capable of using a residual sheet effectively even in a double-sided printing mode. A control unit controls to perform a double-sided image formation process to recording sheets. A detection unit detects a jam of the recording sheet. A determination unit determines whether residual sheets, which are recording sheets on the conveyance path other than a jamming sheet that generates a jam, are available in the image forming process resumed after the jam is removed based on the number of copies of sheets on which the same image is formed, the recording sheets on which images have been formed on one sides, and the latest recording sheet that was normally ejected. The control unit stops the process and ejects the residual sheets that are determined unavailable from the conveyance path when a jam is detected during the process.

Abstract: An image heating apparatus includes: a rotatable cylindrical belt; a heater, provided inside the belt, for heating the belt; and an overheating preventing element, including a circuit which is opened when abnormal temperature rise occurs, for interrupting electric power supply to the heater. The overheating preventing element is provided at a position, inside the belt, where the overheating preventing element is free from direct heat radiation emitted from said heater.

Abstract: An image forming apparatus has a sheet size detecting unit with first and second arms each moved by contact with a moving sheet, the arms disposed at differing locations in a direction orthogonal to sheet movement. An actuator which acts on the sensor is not moved when only one arm is moved by sheet contact, but is moved when both arms are moved by sheet contact so that the sensor output level when only one arm is moved is the same as when neither arm is moved, and the output level of the sensor when both of arms have moved differs from when neither arm moves. The first and second arms have first and second regulating portions, respectively, for regulating actuator movement, and the actuator is moved only when both regulating portions are moved from contact of both arms with the moving sheet.

Abstract: An image forming apparatus includes: an image forming unit configured to form, on an image carrier, a first correction pattern including developer images of a plurality of colors, and a second correction pattern including developer images of the plurality of colors; a registration correction unit configured to perform registration correction control based on a detection result of the developer images of the first correction pattern; and a density correction unit configured to perform density correction control based on a detection result of the second correction pattern. The density correction unit is further configured to decide a detection result of the developer image of at least one color of the second correction pattern used for the density correction control based on a detection result of the developer image of the first correction pattern.