Image forming apparatus

An image forming apparatus comprising:

• a conveyance unit configured to convey a recording material on a conveyance path in the image forming apparatus;
• an irradiation unit configured to radiate light on segments of the recording material being conveyed by the conveyance unit, the light radiated on a segment of the recording material as the segment is being conveyed through an irradiation section of the conveyance path;
• an image capturing unit configured to capture surface images of a plurality of segments of the recording material by capturing, for a plurality of times during an image capturing period, as a surface image, the light radiated by the irradiation unit and reflected on the recording material, wherein the plurality of times corresponds to the plurality of segments;
• an image formation unit configured to form an image on a recording material;
• and
• a control unit configured to control an image forming condition of the image formation unit,
• wherein the conveyance unit accelerates or decelerates a conveyance speed of the recording material in at least a part of the image capturing period during which the image capturing unit captures the surface images the plurality of times,
• wherein the image forming apparatus obtains feature quantity data on the basis of data obtained from the captured surface images, wherein the feature quantity data reflects a feature of the recording material, and
• wherein the control unit corrects the obtained feature quantity data based on an average conveyance speed of the recording material during the image capturing period, and controls the image forming condition based on the corrected feature quantity data.