Signal processor, photoelectric conversion apparatus, and equipment

A signal processor that corrects image data based on signals from a plurality of light receiving pixels by using light shielded data based on signals from a plurality of light shielded pixels, comprising a line memory, a detection unit, a correction value generation unit, and a data correction unit,

• wherein
• the line memory holds image data on a selected row,
• the detection unit generates a selection signal that selects a correction factor based on the image data on at least the selected row,
• the correction value generation unit includes a correction value holding unit configured to hold a correction value and generates and holds the correction value based on the correction factor selected by the selection signal and light shielded data on the selected row, and
• the data correction unit corrects image data on the selected row held in the line memory based on the correction value.