Abstract: A system and process for determining the vignetting function of an image and using the function to correct for the vignetting is presented. The image can be any arbitrary image and no other images are required. The system and process is designed to handle both textured and untextured segments in order to maximize the use of available information. To extract vignetting information from an image, segmentation techniques are employed that locate image segments with reliable data for vignetting estimation. Within each image segment, the system and process capitalizes on frequency characteristics and physical properties of vignetting to distinguish it from other sources of intensity variation. The vignetting data acquired from segments are weighted according to a presented reliability measure to promote robustness in estimation.

Abstract: A method of controlling an image forming system and an image forming system. The method includes: receiving a printing data according a command for interpolation printing for printing by interpolating an image; analyzing the received printing data and deciding an interpolation type; and interpolating the image according to the decided interpolation type and printing the image. Accordingly, it is possible to improve quality of the interpolated image and save resources and time necessary for interpolating the image.

Abstract: An image sensing apparatus includes an image sensing device having a plurality of pixels, a smoothing unit that smoothes a first dark image signal acquired with the image sensing device shielded from light; a subtraction unit that subtracts a second dark image signal from the first dark image signal; an extraction unit that extracts, as a defective pixel of the image sensing device, a pixel of which an obtained difference is outside a preset range; and a correction unit that corrects, out of subject image signals output from the image sensing device, an image signal of the defective pixel extracted by the extracting unit, using an image signal of a pixel peripheral to the defective pixel.

Abstract: The invention relates to a color display device for display a color image and a method of operating such display. The color display device is provided with a plurality of picture elements, two selectable light sources having different predetermined radiance spectra, color selection means which in combination with the selectable light sources is able to produce respective first and second primary colors on the display panel and control means arranged to select alternately one of the selectable light sources and to provide a portion of the picture elements with image information corresponding to the respective primary colors obtainable with the selected light source. The primary colors of the display device can be selected in a time sequential and space sequential way which enable a reduction of a color break-up.

Abstract: An image processing module substantially matches the representation of a display with the expectation of image data. The image processing module comprises a storage unit, a control unit, and an image processing unit. The storage unit stores calibration information with calibration values each corresponding to a physical area on the display. The control unit receives timing data and mode data to accordingly direct the storage unit to output corresponding calibration value. An image processing unit is controlled by the control unit to calibrate the image data according to the corresponding calibration value and output calibrated image data.

Abstract: A signal processing apparatus corrects color mixture between pixel cells in a solid-state imaging device in which the pixel cells including photoelectric transducers are two-dimensionally arranged in an array and in which color filters having primary color components for generating luminance components and other color components are arranged over the pixel cells. The signal processing apparatus includes correction processing means for performing the correction to the signal from a target pixel by using the signals from multiple neighboring pixels adjacent to the target pixel in the solid-state imaging device and correction parameters independently set for the signals.

Abstract: An imaging apparatus includes: a first pixel which receives both visible light and infrared light, and a second pixel which receives infrared light, both pixels being formed on an imaging device; an infrared light component estimation unit which estimates, based on spectral characteristics of light received by the first pixel and spectral characteristics of light received by the second pixel, a magnitude of an infrared light component contained in a signal outputted from the first pixel from a signal outputted from the second pixel; and a subtraction unit which subtracts the estimated infrared light component from the signal outputted from the first pixel.

Abstract: A solid state imaging device has a semiconductor substrate with photodiodes formed thereon. Stacked on the semiconductor substrate are a light shielding layer having openings for the photodiodes, a concave microlens-forming layer having concave lens surfaces on its upper surface, a planarizing layer for covering the concave microlens-forming layer, a color filter, and a convex microlens-forming layer having convex lens surfaces on its upper surface. Each concave lens surface is composed of an arc-shaped incident surface lying at the lowermost part and a reflecting surface extending upwards from a rim of the incident surface. The light rays out of the concave lens surface enter either the incident surface or the reflecting surface of the concave lens surface. The light rays on the reflecting surface reflect off totally and proceed to the incident surface. The light rays on the incident surface are focused toward the photodiode.

Abstract: Disclosed is a method of acquiring physical information that acquires physical information by using a semiconductor device. The semiconductor device includes unit elements, each of which has a detecting unit and a unit signal generating unit. The method includes the steps of: providing an operation current supply unit supplying an operation current such that the unit signal generating unit outputs a unit signal, and a signal processing unit receiving the unit signal output from each of the unit elements forming the semiconductor device and outputting an output unit signal; and when a selective read mode is designated for reading the unit signal from a portion of the respective unit elements, an operation current of the output signal line of the unit signal generating unit not to be read is reduced so as to be smaller than an operation current of the output signal line of the unit signal generating unit to be read.

Abstract: Pixel signals are sequentially output from an image sensor in a reverse order to an order in which light sensing cells are arranged with respect to one of a horizontal direction and a vertical direction. In an image processor, first, a data reading part transfers the pixel signals in the same order as corresponding light sensing cells are arranged with respect to both of a horizontal direction and a vertical direction, and a signal sequence of the pixel signals is changed. Then, the pixel signals which are output group by group are sequentially selected by a selector in accordance with a sequence of groups. As a result, the pixel signals can be supplied from the selector in an order conforming a two-dimensional array of the light sensing cells, to thereby facilitate color interpolation which is to be later performed by a color interpolator.

Abstract: An object of the present invention is to provide a solid-state imaging device and driving method thereof capable of suppressing image quality defect caused by a coupling which occurs when a readout transistor that controls signal charge readout from a photodiode. The solid-state imaging device is an amplifying solid-state imaging device which includes: a unit cell having a readout transistor which reads signal charge from the photodiode, which outputs an amplifier signal corresponding to the signal charge; a first vertical signal line and a second vertical signal line connected to the unit cell; a sampling capacity which accumulates amplifier signals transmitted via the first vertical signal line and the second vertical signal line; a bias current supply, a coupling control transistor, and a coupling control circuit, which prevent transmission of the amplifier signal from the unit cell to the sampling capacity either at the start or the end of the signal charge readout by the readout transistor.

Abstract: A CMOS image sensor includes a unit pixel including controlled by a high voltage; a reference high voltage generator for generating a reference high voltage; and a high voltage output unit for generating the high voltage by using the reference high voltage as an operating voltage to thereby output the high voltage to the unit pixel, wherein a level of the high voltage is stably maintained regardless of a variations of the reference high voltage level.

Abstract: An array substrate comprises a first pixel part including a plurality of first effective pixels and a plurality of first dummy pixels, wherein the first effective pixels are disposed in a display area, and the first dummy pixels are disposed in a peripheral area, the peripheral area being formed around the display area, and a second pixel part including a plurality of second effective pixels and a plurality of second dummy pixels, the second pixel part being adjacent to the first pixel part, wherein the second effective pixels are disposed in the display area, and the second dummy pixels are disposed in the peripheral area.

Abstract: Plural pixel cells generate electric charge signals through photoelectric conversion and then accumulate the electric charge signals therein. An adjustment pixel signal generating part generates differences between the first output voltages of the pixel cells where a prescribed voltage is applied and accumulated and the second output voltages of the pixel cells where the electric charge signals are accumulated, as the adjustment pixel signals. The amplitude detection part detects amplitudes of the adjustment pixel signals. The initialization level adjusting part adjusts an initialization level of the prescribed voltage in accordance with the result of amplitude detection performed by the amplitude detection part.

Abstract: In a solid state image pickup apparatus with a photodetecting device and one or more thin film transistors connected to the photodetecting device formed in one pixel, a part of the photodetecting device is formed over at least a part of the thin film transistor, and the thin film transistor is constructed by a source electrode, a drain electrode, a first gate electrode, and a second gate electrode arranged on the side opposite to the first gate electrode with respect to the source electrode and the drain electrode, and the first gate electrode is connected to the second gate electrode every pixel, thereby, suppressing an adverse effect of the photodetecting device on the TFT, a leakage at turn-off TFT, variation in a threshold voltage of the TFT due to an external electric field, and accurately transferring photo carrier to a signal processing circuit.

Abstract: A CCD Device of the type for providing charge gain by impact ionisation has a multiplication register. Gain provided by a subset of the elements of the multiplication register are independently controllable from other elements in the register. This enables the register to be used in one setting with the same gain applied to all elements and a different setting with a subset of elements arranged to provide a different gain. By comparing the two signals, the gain provided by each element and the register as a whole may be derived.

Abstract: S/N ratio deterioration resulting from dark current generated in each light-receiving pixel is suppressed in a frame transfer CCD image sensor. A predetermined off-voltage VL2 is applied to a transfer electrode before an on-voltage VH is applied to the transfer electrode to form a potential well and to start the accumulation of information charges into the potential well during an exposure period. The off-voltage VL2 is set to be lower than the off-voltage VL1 of the transfer clock signal during a frame transfer (period: t18 to t19). The off-voltage VL2 is set at the pinning voltage, for example. As the result of applying the off-voltage VL2, holes are captured at the interface state in the surface region of the semiconductor substrate, thereby making it difficult for the thermally excited electrons to jump from the valence band to the conduction band.

Abstract: There is provided a signal generator which includes a main memory which stores at least time data indicating timing when a state change of a timing pulse occurs and space data indicating a state of the timing pulse corresponding to the time data; a counter which counts a clock to be a reference; a first memory which stores predetermined time data in time data stored in the main memory; a comparator which compares an output of the counter with the predetermined time data stored in the first memory and to output a result; a second memory which stores predetermined space data in space data stored in the main memory; and output signal control means which controls the timing pulse to a state of the timing pulse indicated by the space data stored in the second memory on the basis of an output of the comparator.

Abstract: There is provided a signal reading apparatus that reads an output signal from a solid-state image sensing device. The apparatus includes a plurality of measuring means that respectively measures pixel data included in the output signal from the solid-state image sensing device and a timing generator that generates a clock signal showing a timing at which each of the plurality of measuring means measures the pixel data from the solid-state image sensing device and respectively supplies the clock signal to the plurality of measuring means in order to make the plurality of measuring means sequentially measure the pixel data from the solid-state image sensing device by means of an interleaving operation.

Abstract: A mobile communication device with camera comprises a mobile communication module, a camera module, a storage unit, a display unit, and a switching module. The mobile communication module has a first transmission interface, the camera module has a second transmission interface; image data processed that are outputted by means of the camera module via the second transmission interface, and next the image data outputted that are received by the mobile communication module via the first transmission interface, and next the image data received that are transmitted to the storage unit to be stored and to the display unit to be displayed. The switching module is installed in the mobile communication module for switching to the camera module operation or the mobile communication module operation.

Abstract: Provided is an image display apparatus whose display images can be viewed regardless of an orientation or an aspect ratio of a display image. When a user sets the orientation and the aspect ratio of a live view display, a background frame corresponding to the orientation and the aspect ratio set by the user is selected. Then, a spare region is determined, and icons are placed in the determined spare region. When the orientation or aspect ratio of the display image is changed, the position of the icons is also changed so that the appearance of the display images is not overlapped with icons or information.

Abstract: An electronic device for allowing a viewer to view still pictures according to the intention of a photographer or drafter of the still pictures when the still pictures are successively displayed, a display method thereof, and a storage medium storing a program for executing the method. The electronic device includes an estimation unit that estimates a level of adaptation of a viewer caused by a first picture displayed and a picture adjustment unit adjusting a second picture based on the estimated level of adaptation when the second picture is displayed subsequently to the first picture.

Abstract: A display screen of a liquid crystal display is divided into a main area and three sub-areas arranged vertically on the right thereof. A through image is displayed on the main area. On the respective sub-areas, composition images are displayed indicating different compositions and object regions different from each other. When any of the images is selected, the selection triggers the generation and recording of an image having composition similar to the selected composition image. When any of the composition images is selected, the selected composition image is enlarged and displayed on the main area.

Abstract: An image sensing apparatus has a plurality of pixels arranged in a matrix-like layout and containing photoelectric conversion devices reads signals in units of one line or a plurality of lines and is provide with an image sensing device 14 adapted to read a signal from a given block area. The apparatus has a flash read mode that, during flash operation, adjusts parameters relating to the readout of the image sensing device 14 so as to produce the same exposure period for all the plurality of lines that comprise a predetermined block area of the image sensing device 14, thus enabling accurate quantity of light detection even when performing strobe photography at high shutter speeds.

Abstract: A photographing apparatus comprises a plurality of optical image pickup units which converges object light and forming an optical image on a focus plane of an image pickup device and an image forming unit which forms a plurality of photographed images from optical images formed by the optical image pickup units. The optical axes of the optical image pickup units cross at one point near lenses, the optical image pickup units are disposed at an equal distance from the cross point, and the optical axes are set at a predetermined angle in such a manner that photographing fields of adjacent optical image pickup units are made contiguous with each other.

Abstract: The present invention provides an optical device and the like which can collect incident light at a high incident angle than an existing microlens, in order to realize a solid-state imaging apparatus and the like corresponding to an optical system (an optical system with a high incident angle ?) with a short focal length for a thin camera. Each unit pixel (2.8 ?m square in size) is made up of a distributed index lens 1, a color filter 2 for green G, Al wirings 3, a signal transmitting unit 4, planarizing films 5, a light-receiving device (Si photodiodes) 6, and a Si substrate 7. The distributed index lens 1 is made of high refractive index materials 33 [TiO2 (n=2.53)] and low refractive index materials 34 [air (n=1.0)] having concentric zones. Further, in a distributed refractive index lens, a width 35 of adjacent divided areas is 200 nm. Also, a film thickness t is 0.5 ?m.

Abstract: In a package including a base fixed with a solid image pickup element, a side wall rising up along the periphery of the base, and internal terminals arranged on a step of the side wall, a plurality of recesses are formed at certain intervals in a lower part of the step to prevent bleeding of an adhesive fixing the solid image pickup element from creeping up over the internal terminals. When the adhesive and bleeding thereof spread around the solid image pickup element during die bonding, they flow into the recesses, making even fast-flowing bleeding hardly creep up an inner surface of the side wall including the step, and enabling prevention of the adhesive from adhering to the internal terminal. Strength, questioned by the presence of the recesses upon wire bonding, can be secured by residual parts between the recesses, and defective wire bonding is less likely to occur.

Abstract: Provided is a complementary metal oxide semiconductor (CMOS) image sensor and method of manufacturing the same. The image sensor can include a plurality of photodiodes, an interlayer insulating layer, a color filter layer formed of a plurality of color filters, and a plurality of microlenses. The plurality of photodiodes can be formed in a semiconductor substrate, and the interlayer insulating layer can be formed on the semiconductor substrate including the photodiodes. The plurality of color filters can be formed on the interlayer insulating layer such that each color filter corresponds to at least two of the plurality of photodiodes. The plurality of microlenses can be formed on the color filter layer.

Abstract: The invention relates to a camera module package including a lens barrel having at least one lens therein and an IR filter installed at a lower end thereof. The package also includes a housing having the lens barrel disposed movable in an optical axis direction in an inner hole thereof. The package additionally includes a ceramic substrate attached to a lower end of the housing, the ceramic substrate having an opening formed on an upper surface thereof corresponding to the position of the lens. The package further includes an image sensor electrically connected to a lower part of the ceramic substrate, the image sensor having an image sensing region thereof exposed through the opening of the ceramic substrate. This prevents damaging the components by the adhesive leaking during the assembly, defective products due to infiltration of extraneous material, improves product reliability and reduces manufacturing costs.

Abstract: A fundus camera having a photographing optical system for photographing a fundus of an eye to be examined, the camera providing, a first illumination optical system for illuminating the fundus of the eye with using infrared light, a second illumination optical system for illuminating the fundus of the eye with using visible light for photography by sharing a part of optical path with the first illumination optical system, a target projecting optical system for projecting a target for focusing on the fundus of the eye, an observation optical system provided with a focusing lens and photographic element having sensitivity in an infrared area, for observing the fundus of the eye which is illuminated by the infrared light of the first illumination optical system and a target image of a target plate projected on the fundus of the eye, displaying device for displaying an image obtained by the observation optical system, moving device for moving by interlocking the focusing lens of the observation optical system and

Abstract: The invention relates to a device for detecting, at a given moment, a light difference between two light detection elements. The invention has application in the technical field of imaging, and more particularly in cameras comprising the invention device. The invention describes a device for detecting a light variation between two locations (20, 21, 22) placed on one surface of a camera body (23) and calculating a corresponding difference. The camera comprises light measuring cells (1C, 2C, 3C) arranged regularly around the viewer (20), the flash (21), and the lens (22). A light differential existing between two locations, for example between the viewer (20) and the lens (22), automatically generates a calculation of this light difference, to compare it with a set or reference value (Vr). A warning device linked to the invention device is activated if the light difference exceeds the set value (Vr).

Abstract: When a difference between a diaphragm target position and a detected state of a diaphragm is less than a neutral zone width, a driving control operation of the diaphragm is prohibited. The neutral zone width can be changed depending on the state of the diaphragm.

Abstract: A short-time exposure image data and a long-time exposure image data of the same object to be photographed are stored to SE memory and LE memory and then transferred to CPU, motion thereof being detected at a motion detecting section on the basis of the two image data; if no motion is detected, a wide dynamic range, synthesized image as synthesized at a synthesizing circuit on the basis of image data read out from the two memories and compressed is outputted through a selector controlled by CPU. If a motion is detected, the long-time exposure image data read out from the LE memory and processed at a signal processing circuit is outputted through the selector.

Abstract: A spatial information detecting device for accurately detecting information of a target space is provided. This device has photoelectric converters for receiving a reflection light from the space, in which a flashing light is being irradiated, a charge storage portion formed in each of the photoelectric converters by applying a control voltage to electrodes on each of the photoelectric converters, a controller for controlling the number of electrodes, to which the control voltage is applied, such that an area of the charge storage portion changes based on a flash cycle of the flashing light, and an amplitude-image generator for generating an amplitude image having pixel values, each of which is provided by a difference between electric charges collected in a lighting period of the flashing light by a charge storage portion and the electric charges collected in a non-lighting period of the flashing light by another charge storage portion.

Abstract: An image pickup apparatus includes an image pickup unit for picking up an image, a lens barrier for covering the front of a lens of the image pickup unit, a display for displaying image data recorded on a recording unit, and a controller for controlling mode switching of the image pickup apparatus in response to a mode switching command from a mode switching unit. The controller switches among three modes including an image pickup mode, a play mode, and a review mode. During the image pickup mode, power is supplied to the image pickup unit for image pickup. During the play mode, data is played on the display with power supplied to the image pickup unit for image pickup. After an elapse of a predetermined threshold time, power supplying to the image pickup unit is stopped. During the review mode, data is played on the display.

Abstract: According to one embodiment, there is provided a video image processing apparatus, including frame generator section which continuously generates at a predetermined frequency (cf. 60 Hz) a plurality of frame images (BF1, BF2, . . . ) on which one screen is represented by a plurality of horizontal lines based on a given video image signal, an interpolation frame generator section which carries out an interpolation process with respect to a part of the plurality of horizontal lines of the adjacent two frame images from among the plurality of frame images generated by the frame generator section, thereby generating partial interpolation frame images (CF1—1, CF2—1, . . . ) which interpolate the adjacent two frame images, and a control section which controls such partial interpolation frame images to be inserted respectively sequentially in time series into the adjacent frame images and to be outputted.

Abstract: To receive new services including audio or video content for presentation by a cable-compatible digital television or other digital audio/video receiver, a module may be connected to the HOST-POD interface of the digital television. The module has a receiver for receiving audio or video content in a first compression format, a transcoder for converting said audio or video content from the first compression format into a second, different compression format, and a controller for transmitting the audio or visual content in the second compression format to the digital television over a HOST-POD interface. By using such a module, front-end components of the digital television may be bypassed while back-end components may be utilized to decompress and present the content. The module may be a PC card or smart card for example.

Abstract: Enlarging a capture volume, comprising: positioning a first motion capture volume offset from a second motion capture volume in a direction that requires minimal motion capture camera reconfigurations, wherein a first plurality of motion capture cameras is configured around the first motion capture volume and a second plurality of motion capture cameras is substantially similarly configured around the second motion capture volume; connecting the first motion capture volume with the second motion capture volume using an extension corridor; minimally reconfiguring the first plurality and the second plurality of motion capture cameras; and adding an appropriate number of additional motion capture cameras.

Abstract: An AV apparatus for showing a volume adjustment and a method therefor are provided. When the AV apparatus enters a screen-off mode, the AV apparatus determines whether a volume is adjustable in response to a volume adjustment signal. If yes, the volume is controlled for adjustment and a first indicatory signal is generated for visually displaying the adjustment. If not, a second indicatory signal is generated for visually displaying the inability of adjustment.

Abstract: An image display apparatus including: an image quality adjustment section to adjust an image quality of the image displayed on the screen according to an alternation of an image quality adjustment parameter value, and to display on the screen at least one reference image having the image quality adjustment parameter value which differs from the image quality adjustment parameter of an original image before the alteration of the image quality adjustment parameter at the alteration of the image quality adjustment parameter value.

Abstract: A display control selection section receives a plurality of display control requirements for screen display and selects and outputs to an input timing control section a display control requirement capable of being processed within a single screen non-display interval out of the received display control requirements. The input timing control section outputs the display control requirement selected by the display control selection section to a display processor when the screen non-display interval comes.

Abstract: An image processing method mixing a first image and a second image, each formed of a plurality of pixels. The image processing method includes determining whether pixels forming the first image are transparent or not; selecting a pixels of the second image corresponding to a transparent pixels of the first image; color mixing pixels of the first image which are determined not to be transparent and the corresponding pixels of the second image; and creating a final image formed of the selected pixels of the second image and the color mixed pixels. An image processing apparatus and an image processing method thus perform a fast mixing process for a plurality of layers.

Abstract: In a tone conversion apparatus, a decision-processing section sequentially detects a signal level difference between pixels of an image in a predetermined direction thereof by using the image signal having a first number of bits, determines whether the signal level difference remains within a preset signal level difference, and determines a pixel which has the same signal level as that of an immediately preceding pixel that encounters the signal level difference and is consecutive with the immediately preceding pixel. A bit-allocation-processing section adds a bit to the least significant bit of the image signal having the first number of bits to convert it into the image signal having second number of bits, divides the signal level difference when the signal level difference remains within the preset signal level difference, and uses the division to set the signal level difference between the consecutive pixels to the consecutive pixels.

Abstract: The present invention provides an apparatus and method for automatically generating moving picture highlights for video stored in a digital video recorder that detects scene change of stored video, extracts information amount with respect to the relevant video interval on the basis of the scene change detection information, automatically generates moving picture highlights according to moving picture highlight length information set by a user or default value in the system, on the basis of results of the scene change detection and the interval information amount.

Abstract: Provided is a receiving circuit which determines whether a PLL circuit is at a locked state or a unlocked state, and thereby realizing an AFT system that operates correctly. The receiving circuit is a video/audio signal processing circuit which demodulates the first signal and the second signal included in a signal received from a tuner circuit.

Abstract: A multimedia receiver includes two tuners capable of independently tuning digital channels to be listened to, or viewed. A channel to be tuned by a multi-media receiver is predicted, based on a subset of digits input by a user. While a current channel is tuned by one tuner, the predicted channel is tuned by the other tuner. If the prediction is correct, the channel to be turned is available for presentation immediately after a time out period. In this way, delay between tuning channels is reduced.

Abstract: A method of automatically changing a channel to enhance user convenience in an image processing device. If a channel changing event in which the broadcast signal is not normally received from the service channel occurs, an image processing device sets an automatic changing channel to automatically change a service channel into a certain channel. Accordingly, whenever the channel changing event occurs, as a user does not need to search for channels and change a service channel, the television can enhance user convenience.

Abstract: A receiving circuit according to the present invention includes a phase-locked loop circuit which outputs an oscillation signal synchronized with a phase of a modulation signal modulated by a video signal, a video signal detector which synchronously detects the modulation signal using the oscillation signal, so as to output the video signal, and a frequency detection circuit which determines whether the frequency of the oscillation signal falls within a predetermined range, so as to output a frequency detection signal indicating whether the phase-locked loop circuit is in a locked state.

Abstract: A method and system are provided for allowing channel surfing during the presentation of a commercial broadcast by returning the viewer to the desired program channel after the commercial broadcast has concluded. When a commercial broadcast is received that interrupts the presentation of a viewer's desired programming, channel surfing is facilitated based on increased audio volume levels broadcast with the commercial broadcast. During channel surfing, the present audio level of the primary channel presenting the undesired commercial broadcast is monitored. If the audio volume level drops below the level of the commercial broadcast or returns to the level set by the viewer for the desired program prior to receipt of the commercial broadcast, the desired program channel may be reselected to return the viewer to her desired program channel. The viewer may be notified that the commercial broadcast has ended prior to reselection of the desired program channel.

Abstract: A tuner unit includes a scan-candidate registration unit that registers candidate frequencies to be scanned, a scan-frequency selection unit that selects frequencies to be scanned, a first scan unit that performs scanning on the basis of the frequencies to be scanned, a reception determination unit that determines whether channel signals can be received, a scan-candidate-frequency update unit that registers, as detected frequencies, frequencies of ones of the channel signals that can be received and eliminates ones of the candidate frequencies to be scanned within a predetermined range with its center at each of the detected frequencies, and a second scan unit that performs scanning on the basis of the updated candidate frequencies to be scanned. Even when the second scan unit performs scanning, the scan-candidate-frequency update unit performs the same process as described above.