An image processing system comprising at least one processor or circuit configured to function as: an image acquisition unit configured to acquire image data generated by an imaging device that captures an optical image formed by an optical system, the optical image including a low-distortion region and a high-distortion region, wherein when a focal distance of the optical system is defined as f, a half angle of view is defined as θ, an image height on an image plane is defined as y, and a projection property representing a relationship between the image height y and the half angle of view θ is defined as y(θ), y(θ) in the low-distortion region is greater than f × θ and is different from the projection property in the high-distortion region; a first image recognition unit (31b-34b) configured to perform image recognition on image data of at least a partial region in the image data acquired by the image acquisition unit to output a first image recognition result, wherein the partial region is a region corresponding to the low-distortion region; a second image recognition unit configured to perform image recognition on image data of a region wider than the partial region in the image data acquired by the image acquisition unit to output a second image recognition result; and an integration processing unit configured to output an image recognition result integrated on the basis of the first image recognition result and the second image recognition result, wherein the integration processing unit is configured to output the integrated image recognition result on the basis of reliability of the first image recognition result and reliability of the second image recognition result, and in case the first image recognition result is different from the second image recognition result, a recognition result with higher reliability out of the first image recognition result and the second image recognition result is adopted as the integrated image recognition result. an image acquisition unit configured to acquire image data generated by an imaging device that captures an optical image formed by an optical system, the optical image including a low-distortion region and a high-distortion region, wherein when a focal distance of the optical system is defined as f, a half angle of view is defined as θ, an image height on an image plane is defined as y, and a projection property representing a relationship between the image height y and the half angle of view θ is defined as y(θ), y(θ) in the low-distortion region is greater than f × θ and is different from the projection property in the high-distortion region; a first image recognition unit (31b-34b) configured to perform image recognition on image data of at least a partial region in the image data acquired by the image acquisition unit to output a first image recognition result, wherein the partial region is a region corresponding to the low-distortion region; a second image recognition unit configured to perform image recognition on image data of a region wider than the partial region in the image data acquired by the image acquisition unit to output a second image recognition result; and an integration processing unit configured to output an image recognition result integrated on the basis of the first image recognition result and the second image recognition result, wherein the integration processing unit is configured to output the integrated image recognition result on the basis of reliability of the first image recognition result and reliability of the second image recognition result, and in case the first image recognition result is different from the second image recognition result, a recognition result with higher reliability out of the first image recognition result and the second image recognition result is adopted as the integrated image recognition result.