Abstract: A white balance adjusting device mounted in an electro-developing type camera in which an electro-developing recording medium, which electronically develops an image formed thereon, is used. A mask member, in which first and second color filters are provided, is disposed in front of an electro-developing recording medium. The electro-developing recording medium has a recording area, in which a color image is recorded, and a data area, in which optical information used for a white balance adjustment is recorded. The first color filter faces the recording area, and the second color filter faces the data area. In the camera body, a diffuser and a light leading member are provided at a position corresponding to the second color filter.

Abstract: A camera is provided in which light entering from an object field through a shooting lens is reflected by reflective mirror, and an image is formed on a focusing screen. The light that forms the image is reflected in a pentaprism, and forms an image on an eyepiece lens. Photometry is performed on each light component of the light that left from the pentaprism through the photometry lens by a photometry element and color information from the photometry value is computed in a CPU. Looking through a finder the color information is displayed, having been computed by the CPU at a color information display apparatus. A user can see the display in the finder through the eyepiece lens. Also, a camera wherein when a photographer either presses a release button half way down or all the way down, the CPU performs an exposure calculation and calculates the aperture value and the shutter speed for appropriate exposure.

Abstract: A colorimetric device, particularly suitable for a camera, that provides reliable color data so that a subject field is photographed with appropriate color balance. A CPU reads out sensor data D.sub.B, D.sub.R corresponding to red (R) and blue (B) light components of an incident light from the subject field a light sensor or photometric element disposed in the camera. Next, the CPU compares the sensor data D.sub.B of the B color component, and the sensor data D.sub.R of the R color component, with a predetermined standard value K1, and when it is determined that either of the sensor data D.sub.B of the B color component, or the sensor data D.sub.R of the R color component, is below the standard value K1, a "measurement impossible" display is performed for a color temperature T and a balance value LB. On the other hand, if both sensor data D.sub.B, D.sub.R are greater than the standard value K1, the color temperature T and the light balance value LB are calculated by a calculation circuit.

Abstract: A photometry device of a camera has a photometry circuit which measures the luminance value of the object field, a colorimetry circuit which measures the color balance of the object field, and a scene discrimination unit which discriminates the scene on the basis of the output from the colorimetry circuit. The device calculates the proper exposure value of the object field on the basis of the outputs from the photometry circuit and scene discrimination unit. Scene discrimination is preferably made using photographing mode information, photographing distance information, or current time information to improve discrimination accuracy.

Abstract: A photometric device is provided with a light receiving section including a diffusing member which has a spherical diffusing surface to diffuse incident light to provide a predetermined oblique incidence angle characteristics, and a plurality of light receiving units which each receive light diffused by the diffusing member, each of the light receiving units including a light receiving surface that is a symmetrical form with respect to an optical axis of the light receiving section. The oblique incidence angle characteristics in the latitudinal direction can be made regardless of or independently of an oblique incidence angle characteristics in the longitudinal direction.

Abstract: An electro-developing recording medium has a plurality of recording areas for recording R, G and B color images. The exposure operation is performed so that the aperture value and the basic exposure time are determined. The R/G signal and the B/G signal outputted from the white balance sensor are read. The basic exposure time is adjusted in accordance with the R/G signal and B/G signal, so that the actual exposure times regarding the R and B images are calculated. When the shortest exposure time of the actual exposure times corresponding to R, G, and B images is shorter than a limit value, a warning sound may be outputted by a buzzer. Further, the aperture value may be increased by an amount corresponding to, for example, 0.5 Ev. In accordance with the increased aperture value, the exposure time is recalculated.

Abstract: A strobe dimmer of which the luminous intensity and color temperature are respectively controllable comprises: a fourfold-voltage rectifier circuit(1) having two twofold-voltage rectifier circuits(11,12) for rectifying an input voltage to twofold or fourfold DC voltage depending on the magnitude of input voltage and applying the rectified input voltage to respective strobe discharge tubes(ST1,ST2,ST3); a high voltage generating circuit(5) for supplying high voltage to respective trigger terminals(Tr) of the strobe discharge tubes(ST1,ST2,ST3) through corresponding trigger coils(LT); a first luminous intensity control circuit(13) connected between a ground terminal(GND) and an output terminal(X) of the fourfold rectifier circuit(1), and connected to respective anode terminals(Ad) of the strobe discharge tubes(ST1,ST3); a second luminous intensity control circuit(13a) connected between the ground terminal(GND) and the output terminal(X) of the fourfold rectifier circuit(1), and connected to respective anode ter

Abstract: Scene intensity measuring and illumination source detection apparatus for determining scene illuminant and appropriate exposure settings for an image capture device is disclosed. The apparatus includes a diffractive optical element including an off-axis segment for dispersing incident scene illumination into its spectral components and for focusing the incident scene illumination, a structure responsive to the spectral intensities of the spectral components of the incident scene illumination for producing detection signals corresponding to such spectral components, a structure coupled to the sensing means for producing digitized detection signals, and a structure responsive to the digitized detection signals for determining the scene illuminant and the appropriate exposure settings for the image capture device.

Abstract: A chromatic balancer determines an optimal chromatic balance between strobe illumination and light illumination during balance synchro photography. A photometric detector measures the amount of light from one or more regions in the scene to be photographed. A chromatic balance calculator determines the chromatic balance of the photograph scene. A background exposure correction value calculator determines a background light exposure correction value. A flash level correction value calculator determines a flash level correction value.

Abstract: An exposure calculation device for use in a camera is, provided with a light metering device for effecting light metering in each of plural areas divided in the object field and generating a light metering signal, containing information relating to the color of the object in each area. A first judgment device judges, whether the object in each area is colored or uncolored based on the light metering signal, and determines colored areas in which the object is colored and uncolored areas in which the object is uncolored. A second judgment device judges whether a predetermined uncolored area contains a white or black object, based on the light metering signals from the colored areas and those from the uncolored areas. An exposure value determining device determines the exposure value according to the light metering signals, based on the results of judgment by the first and second judgment devices.

Abstract: A camera is equipped with an integral color temperature measurement mechanism. The color temperature measurement mechanism measures the color temperature of the light source illuminating the subject field and a display mechanism displays the color temperature information based on output from the color temperature measurement mechanism. The camera also includes a system that determines what kind of filter is recommended based on the output of the color temperature measurement mechanism and a display mechanism that displays the output of the filter determination.

Abstract: An exposure calculation device for use in a camera, is provided with a light metering device for effecting light metering in each of plural areas divided in the object field and generating a light metering signal, containing information relating to the color of the object in each area. A first judgment device judges, whether the object in each area is colored or uncolored, based on the light metering signal and determining colored areas in which the object is colored and uncolored areas in which the object is uncolored; A second judgment device judges whether a predetermined uncolored area contains a white or black object, based on the light metering signals from the colored areas and those from the uncolored areas; An exposure value determining device determines the exposure value according to the light metering signals, based on the results of judgment by the first and second judgment devices.

Abstract: There are provided a method and apparatus capable of estimating a color temperature of a photographic light source. A theoretical reference value is obtained which is represented by summation or integration of the product of a spectral energy distribution of an object having a known color temperature, a spectral sensitivity distribution of a photometric system, and a spectral reflectance distribution defined by a certain expression. An actual value is acquired by measuring at least a portion of light reflected from a body which is exposed to light emitted from a light source whose color temperature is to be estimated. Spectral reflectance distributions are calculated for a plurality of color temperatures such that the difference between the theoretical reference value and the actual value becomes minimum. A calculation is performed to obtain the sum of abnormal components of the obtained spectral reflectance distribution whose maximum values exceed 1.

Abstract: The present invention relates to a camera having a light-source determining function for determining the kind of light source. According to the present invention, the light-source determining function of the camera is realized by using the output of a light receiving part of a remote control processing part of the camera.

Abstract: A still-video camera has a white balance adjustment device. The white balance adjustment device includes a filter film which has a translucent opal filter portion and a transparent filter portion. The filter film is moved by a motor. During a white balance adjustment, the translucent opal filter portion is positioned in front of a first CCD, and in an image recording operation, the transparent filter portion is positioned in front of the first CCD. When the white balance adjustment is to be carried out, an output signal from a second CCD is transmitted to an AF control circuit, and thus an AF adjustment is also performed. The AF adjustment is carried out in such a manner that a spatial frequency of the output signal of the second CCD has a highest value.

Abstract: A camera having a structure in which a colorimetric value is not influenced by the color tone of a main object to be photographed. The camera, in which a film having a data recording section can be loaded, comprises three light receiving portions differing in spectral sensitivity. Based on the output from the three light receiving portions, a colorimetric section measures a color tone of light surrounding the object to be photographed. The light receiving portions are arranged on a front portion of the camera and are arranged so as to receive light at a range larger than an angle of a photographed view. Based on the output of the colorimetric portion, a color correction amount determining portion determines a color correction amount during a printing operation. The data as to the color correction amount is recorded on the data recording section of the film by a recording unit.

Abstract: An auto-exposure device of a camera which can generate a photograph which fits to an image of a photographing time band in the photographing of an evening scene, a morning scene and so on. The auto-exposure device comprises a split photo-metering device for photo-metering a plurality of split areas of an object field, a color temperature measurement device for measuring a color temperature of a light source for illuminating the object field, and an exposure calculation device for calculating an exposure value based on the output of the split photo-metering device and the output of the color temperature measurement device.

Abstract: A photometric device for use in a camera includes, but is not limited to, a segmented brightness measuring unit which segments a photographic scene of a camera into multiple areas and which outputs corresponding multiple photometric values. A spectral analysis unit performs spectral analysis of the spatial frequency of a photographic subject using the corresponding multiple photometric values output by the segmented brightness measuring unit. Also, a photometric computation unit computes photometric values based on the spectral pattern of the photographic subject output by the spectral analysis unit. The spectral analysis unit may be disposed within the photometric device, or may be located elsewhere in a camera's body.