Image sensing apparatus and image sensing system

An image sensing apparatus comprising:

• an image sensing unit configured to have a plurality of pixels, each including a photoelectric conversion unit, that are arrayed, an effective pixel area in which light is incident on the photoelectric conversion units of the arrayed pixels, and a shaded pixel area in which the photoelectric conversion units of the arrayed pixels are shielded from light;
• a plurality of analog-to-digital conversion units configured to be connected one-to-one to a plurality of columns of the arrayed pixels, each of the plurality of columns includes at least one pixel arrayed in the effective pixel area and at least one pixel arrayed in the shaded pixel area;
• a feedback control unit configured to output, as a common offset compensation signal for the plurality of columns, an offset compensation signal for compensating for an amount of error between a reference value and an output signal of the shaded pixel area output from at least two of the plurality of analog-to-digital conversion units;
• and
• a plurality of offset compensation units configured to be arranged one-to-one on the input side of each of the plurality of analog-to-digital conversion units, and to compensate offsets by subtracting the common offset compensation signal from an output signal of the effective pixel area.