Imaging apparatus and control method of imaging apparatus
AssigneeCanon Kabushiki Kaisha
InventorMineo Uchida
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Abstract
An imaging apparatus includes a clamp level is multiplied by a first feedback gain, and correct a signal of a part of photoelectric conversion portions of a unit pixel in an opening region based on a result of multiplication in which an error amount between a signal of a part of a photoelectric conversion portions of the unit pixel in a light-shielded region and a clamp level is multiplied by a second feedback gain, and thus the signal of the unit pixel can be corrected precisely.
Claims6
An imaging apparatus comprising:
- a pixel region in which a plurality of unit pixels each having a macro lens, a first photoelectric conversion portion and a second photoelectric conversion portion is arranged in a matrix form, wherein the pixel region includes an opening pixel region and a light-shielded pixel region;
- a driver that drives the pixel region so that a signal of at least one of the first photoelectric conversion portion and the second photoelectric conversion portion of each unit pixel is read out independently in a first pixel row of the pixel region, and a signal of at least one of the first photoelectric conversion portion and the second photoelectric conversion portion of each unit pixel is not read out independently in a second pixel row of the pixel region different from the first pixel row;
- a clamp processor that clamps signals of the opening pixel region of the pixel region to a reference level based on signal of the light-shield pixel region of the pixel region;
- and
- a controller that controls the clamp processor to clamp output signals of the second pixel row in the opening pixel region based on a result of multiplication in which a difference between the output signal of the second row in the light-shielded region and the reference level is multiplied by a first feedback gain, and to clamp output signals of the first pixel row in the opening pixel region based on a result of multiplication in which a difference between the output signal of the first pixel row in the light-shielded region and the reference level is multiplied by a second feedback gain,
- wherein the second feedback gain is greater than the first feedback gain.
A control method of an imaging apparatus including a pixel region in which a plurality of unit pixels each having a micro lens, a first photoelectric conversion portion and a second photoelectric conversion portion is arranged in a matrix form, wherein the pixel region includes an opening pixel region and a light-shielded pixel region, the control method comprising:
- driving the pixel region by a driver so that a signal of at least one of the first photoelectric conversion portion and the second photoelectric conversion portion of each unit pixel is read out independently in a first pixel row of the pixel region, and a signal of at least one of the first photoelectric conversion portion and the second photoelectric conversion portion of each unit pixel is not read out independently in a second pixel row of the pixel region different from the first pixel row;
- clamping signals of the opening pixel region of the pixel region to a reference level based on signals of the light-shield pixel region of the pixel region by a clamp processor;
- and
- controlling, by a controller, the clamp processor to clamp output signals of the second pixel row in the opening pixel region based on a result of multiplication in which a difference between the output signal of the second row in the light-shielded region and the reference level is multiplied by a first feedback gain, and to clamp output signals of the first pixel row in the opening pixel region based on a result of multiplication in which a difference between the output signal of the first pixel row in the light-shielded region and the reference level is multiplied by a second feedback gain,
- wherein the second feedback gain is greater than the first feedback gain.
Dependencies are inferred from the claim text.