Imaging device and control method of imaging element

Abstract

Power consumption of an imaging element which outputs only a region of interest (ROI) at high resolution is reduced. In a two-dimensional pixel array in which pixel rows arranged in a predetermined direction are arranged in a direction perpendicular to the predetermined direction, the imaging element performs imaging at high resolution for a first pixel row including a predetermined region and performs imaging at low resolution for a second pixel row other than this. The first image processing unit generates an image of a predetermined region on the basis of an imaging signal of the first pixel row. A pixel adding unit performs an adding process between pixels on the imaging signal of the first pixel row to make resolution the same as resolution of the imaging signal of the second pixel row. The second image processing unit generates an image of an entire region on the basis of the imaging signal of the second pixel row and the imaging signal of the first pixel row subjected to the adding process.

1 . An imaging device comprising:
 an imaging element that performs imaging at predetermined resolution for a first pixel row including a predetermined region and performs imaging at resolution lower than the predetermined resolution for a second pixel row other than the first pixel row in a two-dimensional pixel array in which pixel rows arranged in a predetermined direction are arranged in a direction perpendicular to the predetermined direction;   a first image processing unit that generates an image of the predetermined region on a basis of an imaging signal of the first pixel row;   a pixel adding unit that performs an adding process between pixels on the imaging signal of the first pixel row to make resolution the same as resolution of an imaging signal of the second pixel row; and   a second image processing unit that generates an image of an entire region on a basis of the imaging signal of the second pixel row and the imaging signal of the first pixel row subjected to the adding process.   
     
     
         2 . The imaging device according to  claim 1 , further comprising:
 a motion detection processing unit that detects motion according to a change in time series of the image of the entire region; and   a control unit that controls the imaging element to image the first pixel row while making a region in which the motion is detected the predetermined region.   
     
     
         3 . The imaging device according to  claim 2 ,
 wherein the control unit controls the imaging element to increase a frame rate when a transition is made from a state in which the motion is not detected to a state in which the motion is detected.   
     
     
         4 . The imaging device according to  claim 2 ,
 wherein the control unit controls the imaging element to change a frame rate according to a moving speed of the region in which the motion is detected.   
     
     
         5 . The imaging device according to  claim 2 ,
 wherein, in a case where a plurality of moving bodies of different moving speeds is detected in the image of the entire region, the control unit controls the imaging element to image the first pixel row while making a region including the moving bodies the predetermined region.   
     
     
         6 . The imaging device according to  claim 2 , further comprising:
 an exposure evaluation value generating unit that generates an exposure evaluation value on a basis of the region in which the motion is detected in the image of the entire region,   wherein the control unit controls the imaging element to perform exposure on a basis of the exposure evaluation value.   
     
     
         7 . The imaging device according to  claim 2 ,
 wherein, in a state in which the motion is detected, the imaging element alternately repeats a first frame period in which the imaging at the predetermined resolution is performed for the first pixel row and the imaging is not performed for the second pixel row, and a second frame period in which the imaging is performed at resolution lower than the predetermined resolution for all the pixel rows.   
     
     
         8 . The imaging device according to  claim 2 ,
 wherein the imaging element performs the imaging at the predetermined resolution for the first pixel row only in a state in which the motion is detected.   
     
     
         9 . The imaging device according to  claim 1 , further comprising:
 an output processing unit that outputs the image of the predetermined region generated by the first image processing unit.   
     
     
         10 . A control method of an imaging element that performs imaging at predetermined resolution for a first pixel row including a predetermined region and performs imaging at resolution lower than the predetermined resolution for a second pixel row other than the first pixel row in a two-dimensional pixel array in which pixel rows arranged in a predetermined direction are arranged in a direction perpendicular to the predetermined direction, the control method comprising:
 a first image processing procedure that generates an image of the predetermined region on a basis of an imaging signal of the first pixel row;   a pixel adding procedure that performs an adding process between pixels on the imaging signal of the first pixel row to make resolution the same as resolution of an imaging signal of the second pixel row; and   a second image processing procedure that generates an image of an entire region on a basis of the imaging signal of the second pixel row and the imaging signal of the first pixel row subjected to the adding process.