Abstract:
A restoration filter generation device that generates a restoration filter for a restoration process on the basis of a point spread in an optical system, the restoration process being performed on luminance system image data as image data concerning a luminance which is generated on the basis of image data for each color of plural colors acquired by an image pickup device having the optical system, the restoration filter generation device includes a first transfer function acquisition device, a correction information acquisition device, a second transfer function acquisition device, a third transfer function calculation device, and a restoration filter generation device that generates the restoration filter for the restoration process on the basis of the third transfer function calculated by the third transfer function calculation device.
Abstract:
A restoration process using a restoration filter that is based on a point spread function for an optical system is performed for original image data acquired from an image-capturing element by an image taking of an object image using the optical system, so that recovery image data are acquired. The above restoration process is performed, in a point-image restoration processing section, for color data of the original image data in which a gradation correction has been performed by a logarithmic process. The restoration filter may be configured by a filter coefficient corresponding to the image data before the logarithmic process, or may be configured by a filter coefficient corresponding to the image data after the logarithmic process. Thus, by performing the restoration process capable of flexibly responding to various properties of the original image, it is possible to reduce the image degradation such as the ringing in the recovery image.
Abstract:
An image processing device includes a demosaicing process device, a luminance system image data acquisition device that acquires luminance system image data as image data regarding the luminance, a point image restoration process execution device, an information acquisition device that acquires control information concerning execution of the point image restoration process on the basis of imaging information concerning an imaging condition of a subject, and a point image restoration process control device.
Abstract:
An imaging device 10 according to one aspect of the present invention includes: a subject distance acquisition section 115; a movement amount acquisition section 120 that acquires an amount of movement of the subject on the basis of the subject distance; a restoration processing determination section 125 that determines, on the basis of the amount of movement acquired by the movement amount acquisition section 120, whether the restoration processing should be performed on the images through a restoration filter, a restoration strength of the restoration processing should be adjusted and the restoration processing should be performed on the images, or the restoration processing should not be performed on the images; and a restoration processing execution section 105 that performs the restoration processing on the images through the restoration filter or with the adjusted restoration strength, on the basis of the determination of the restoration processing determination section 125.
Abstract:
In a case where IR data of a near-infrared light image is data in which a visible light component and a near-infrared light component coexist, a point image restoration process is performed on the IR data using a first point image restoration filter based on a first point spread function for visible light of the optical system and a second point image restoration filter based on a second point spread function for near-infrared light of the optical system. An appropriate point image restoration process is performed on the IR data that is captured in a time zone of twilight or dawn by performing weighted averaging on a point image restoration process using the first point image restoration filter and a point image restoration process using the second point image restoration filter using a first gain α and a second gain β according to a light amount ratio between visible light and near-infrared light at the time of capturing the IR data.
Abstract:
An optical system has the entire angle of view at a wide-angle end of not smaller than 90 degrees. A spatial frequency at which an MTF of the optical system acquired using an evaluation wavelength in a region of an image formation plane in which the distance from the center of the image formation plane is not less than 80% and less than 95% of half of the length of a diagonal line of an imaging surface of an imaging element image is not more than 30% is higher at the wide-angle end than at a telephoto end. When F≥√(Fw×Ft) is satisfied (where F indicates the focal length of the optical system when the target image is captured, Fw indicates the focal length at the wide-angle end, and Ft indicates the focal length at the telephoto end), a sharpening processing unit performs a restoration process based on an optical transfer function of the optical system as a sharpening process.
Abstract:
An image capturing apparatus according to an aspect of the present invention includes an image capturing unit, a display unit that displays an imaged picture imaged by the image capturing unit and a guide linearly shaped along a sagittal direction or a tangential direction in the imaged picture, the guide assisting imaging of a calibration image used for calibration in a point image restoration process, and a parameter calculation unit that calculates a parameter for the point image restoration process on the basis of the calibration image imaged by the image capturing unit with assistance from the guide.
Abstract:
A restoration filter generation device which generates a restoration filter for performing a restoration process on luminance system image data, the restoration process being based on a point-image distribution in an optical system, the luminance system image data being image data relevant to luminance and being generated based on image data for each color of multiple colors, the restoration filter generation device including an MTF acquisition device which acquires a modulation transfer function MTF for the optical system; and a restoration filter generation device which generates the restoration filter based on the modulation transfer function MTF, the restoration filter suppressing an MTF value of image data for each color of the multiple colors to 1.0 or less at least in a region of a particular spatial frequency or less, the image data for each color of the multiple colors corresponding to the luminance system image data after the restoration process.
Abstract:
Disclosed is a technique capable of efficiently storing and retaining characteristic data (a restoration filter or the like) of an optical system used for a restoration process in a storage unit with limited storage capacity in consideration of the degree of image restoration. An image processing device includes a characteristic data storage unit 42 which is capable of storing characteristic data of a plurality of types of optical systems, and a restoration processing unit which subjects source image data to a restoration process using a restoration filter based on a point spread function of an optical system to acquire recovered image data. In case where storing new characteristic data in the characteristic data storage unit, characteristic data which is stored in the characteristic data storage unit 42 is controlled based on a restoration evaluation value which is allocated to characteristic data according to the type of optical system.
Abstract:
Disclosed are an image processing device, an imaging device, an image processing method, and an image processing program capable of, when recovering a deteriorated image due to a point spread function of an optical system, suppressing the occurrence of artifact and color gradation and achieving reduction in computational costs. The image processing device includes a frequency recovery processing unit which subjects image data acquired from an imaging element by capturing an object image using an optical system to frequency recovery processing using a frequency recovery filter based on a point spread function of the optical system, a gradation correction processing unit which subjects image data subjected to the frequency recovery processing to nonlinear gradation correction, and a phase recovery processing unit which subjects image data subjected to the gradation correction to phase recovery processing using a phase recovery filter based on the point spread function of the optical system.