| 摘要 |
A wide dimming dynamic range and high dimming resolution are obtained without causing a variation in the amount of received light due to pulse illumination light in each line of an imaging element. An imaging device includes a light source emitting light by pulse driving, a light source control unit controlling the amount of emitted light by performing pulse modulation driving of the light source, and an imaging unit including an imaging element, in which a plurality of pixels are arrayed in a horizontal and vertical direction, and performs imaging by driving the imaging element using a rolling shutter method. The light source control unit performs pulse driving of the light source at a timing synchronized with a timing pulse signal having, as a period, 1/p (p is an integer of 1 or more) of the exposure start timing interval when driving the imaging element using the rolling shutter method. |
| 主权项 |
1. An imaging device, comprising:
a light source that emits light by pulse driving; a light source control unit that controls an amount of light emitted from the light source by performing pulse modulation driving of the light source; and an imaging unit that includes an imaging element, in which a plurality of pixels are arrayed in a horizontal direction and a vertical direction, and performs imaging by driving the imaging element using a rolling shutter method, wherein the light source control unit performs pulse driving of the light source at a timing synchronized with a timing pulse signal having, as a period, when p is an integer of 1 or more, 1/p of an exposure start timing interval when driving the imaging element using the rolling shutter method, wherein the imaging unit performs scan driving of a horizontal pixel line, in which the pixels are aligned in the horizontal direction, sequentially from one end side of the horizontal pixel line in the vertical direction to the other end side, and performs driving by shifting an exposure start timing of each horizontal pixel line by a horizontal scanning period that is a period in which one horizontal pixel line is scanned, a received light amount control unit is further provided which has a received light amount control table in which a combination of the amount of light emitted from the light source and an exposure time of the imaging element is matched with an assumed amount of received light that the imaging element receives in that case, determines a target value of the amount of light emitted from the light source and a target value of the exposure time of the imaging element with reference to the received light amount control table, and controls the light source control unit and the imaging unit based on the determined target value of the amount of emitted light and the determined target value of the exposure time, and the light source control unit performs pulse driving of the light source using a pulse driving signal of the same pattern having, as one period, a block period that is an exposure start timing interval of a block in which line blocks, each of which includes n lines obtained by dividing the total number L of horizontal pixel lines of the imaging element by m, when both n and m are integer of 2 or more, are arrayed in the vertical direction. |
