Importance

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Abstract

A ranging device according to an embodiment enables efficient use of the memory resources depending on the situation. The ranging device includes a control register (21) that holds the pixel mode; an array unit (143) that includes an arrangement of a plurality of light receiving units each detecting the incidence of photons; a reading circuit (22) that reads detection signals from each light receiving element with a predetermined sampling period; a pixel value generating unit (15, 161, 162) that tallies, in the units of pixels, the number of detection signals read from each light receiving element, and generates, for each sampling period, the pixel value of each pixel; and a memory (17) that is used to store, for each pixel, a histogram of the pixel values in each sampling period. When a first pixel mode is held in the control register, an area having a first size in the memory is allotted to each pixel. When a second pixel mode is held in the control register, an area having a second size in the memory, which is different than the first size, is allotted to each pixel.

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First Claim