JP2009016917A5 - - Google Patents

Claims (9)

An image processing apparatus that removes periodic beat noise components included in pixel data from pixel data obtained from an image sensor having a plurality of optical black regions,
In accordance with the driving state of the image sensor, designation means for designating at least one of the plurality of optical black areas,
A distribution unit that distributes a plurality of pixel data obtained from the optical black area designated by the designation unit to a plurality of integration units in a cycle of the beat noise component;
Noise detection means for obtaining a plurality of noise data indicating periodic beat noise components included in pixel data obtained from the image sensor from the integration results in the plurality of integration means;
The effective pixel of the image sensor so that the phase of the beat noise component included in the plurality of pixel data obtained from the effective pixel region of the image sensor matches the phase of the beat noise component indicated by the plurality of noise data An image processing apparatus comprising: correction means for correcting by subtracting the value of the noise data from the value of each pixel data obtained from the region. The plurality of optical black areas, with respect to the effective pixel area, with respect to the effective pixel area, a horizontal optical black area positioned in a direction horizontal to a line for reading out pixel data of the image sensor, and the effective pixel area. The image processing apparatus according to claim 1, wherein the image processing apparatus is a vertical optical black region located in a direction perpendicular to a line for reading out pixel data of the image sensor . The designation means designates the horizontal optical black region and the vertical optical black region when a still image is generated by the image sensor, and the horizontal optical when the moving image is generated by the image sensor. The image processing apparatus according to claim 2, wherein a target black area is designated. The designation means designates the vertical optical black region if the thinning intervals of pixel data in the effective pixel region of the image sensor and the vertical optical black region are equal, and specifies the effective pixel region of the image sensor and the horizontal optical 3. The image processing apparatus according to claim 2, wherein the horizontal optical black area is designated if the pixel data thinning intervals in the black area are equal. The correction means determines the value of the noise data detected from the second image data obtained before the first image data from the value of each pixel data obtained from the effective pixel area in the first image data. The image processing apparatus according to claim 3, wherein the subtraction is performed. The correction means uses noise data used for correcting the first image data based on an initial phase of noise data in the second image data, a period of the noise data, and one vertical period for driving the imaging device. The image processing apparatus according to claim 5, wherein an initial phase is calculated. The correction means applies a gain to noise data detected by the noise detection means in accordance with a gain applied to the first image data and a change in gain applied to the second image data. Item 7. The image processing apparatus according to Item 5 or 6. It has a designation unit, a sorting unit, a noise detection unit, and a correction unit, and removes a periodic beat noise component included in the pixel data from pixel data obtained from an image sensor having a plurality of optical black areas. A noise removal method for an image processing apparatus,
The designation unit designates at least one of the optical black areas from the plurality of optical black areas in accordance with a driving state of the image sensor; and
The distribution means distributes a plurality of pixel data obtained from the optical black region designated in the designation step to a plurality of integration means in a cycle of the beat noise component;
A noise detecting step in which the noise detecting means obtains a plurality of noise data indicating periodic beat noise components included in pixel data obtained from the image sensor from the integration results in the plurality of integrating means;
The correction means is configured so that the phase of the beat noise component included in the plurality of pixel data obtained from the effective pixel region of the image sensor matches the phase of the beat noise component indicated by the plurality of noise data. A noise removing method for an image processing apparatus, comprising: a correction step of correcting by subtracting the value of the noise data from a value of each pixel data obtained from an effective pixel region of the image sensor. It has a designation unit, a sorting unit, a noise detection unit, and a correction unit, and removes a periodic beat noise component included in the pixel data from pixel data obtained from an image sensor having a plurality of optical black areas. A program for realizing a noise removal method of an image processing apparatus by a computer,
The designation unit designates at least one of the optical black areas from the plurality of optical black areas in accordance with a driving state of the image sensor; and
A distribution step of distributing the plurality of pixel data obtained from the optical black region designated in the designation step to a plurality of integration units in the period of the beat noise component;
A noise detecting step in which the noise detecting means obtains a plurality of noise data indicating periodic beat noise components included in pixel data obtained from the image sensor from the integration results in the plurality of integrating means;
The correction means is configured so that the phase of the beat noise component included in the plurality of pixel data obtained from the effective pixel region of the image sensor matches the phase of the beat noise component indicated by the plurality of noise data. And a correction step of correcting by subtracting the value of the noise data from the value of each pixel data obtained from the effective pixel area of the image sensor.