Image processing apparatus
An image processing apparatus is provided which minimizes reduction in S/N ratio and deterioration in resolution feeling at the lens periphery when the peripheral light amount drop correction of the lens is performed. An image processing LSI to perform the peripheral light amount drop correction of the imaging lens includes a space-direction noise removal correction part and a time-direction noise removal correction part. As the distance from the lens center position increases, the space-direction noise removal correction part reduces the noise reduction correction intensity to the image region to which the light amount drop correction gain is added in each image. As the distance from the lens center increases, the time-direction noise removal correction part increases the noise removal correction intensity to the image region to which the light amount drop correction gain is added in each image.
1. An image processing apparatus comprising:
a peripheral light amount drop correction part that receives input of an image signal, and adds a peripheral light amount drop correction gain of a peripheral part of an imaging lens to each image constituting the inputted image signal according to a peripheral light amount drop characteristic of the imaging lens;
a first noise removal part using a spatial filter to perform a first noise removal correction to change a first noise removal correction intensity of each image constituting the image signal according to a distance of each pixel from the lens center position of the imaging lens;
an image memory to store each image constituting the image signal; and
a second noise removal part using a time filter to perform a second noise removal correction to change a second noise removal correction intensity of a present image constituting the inputted image signal according to the distance of each pixel from the lens center position and by referring to an image previous to the present image and stored in the image memory, wherein
as the distance of each pixel from the lens center position increases, the first noise removal part using the spatial filter reduces the first noise removal correction intensity using the spatial filter to an image region to which the peripheral light amount drop correction gain is added in each image, and
as the distance of each pixel from the lens center position increases, the second noise removal part using the time filter increases the second noise removal correction intensity using the time filter to the image region to which the peripheral light amount drop correction gain is added in each image.
2. The image processing apparatus according to claim 1 , wherein
the first noise removal part using the spatial filter does not perform the first noise removal correction using the spatial filter to an image region to which the peripheral light amount drop correction gain is not added in each image, and
the second noise removal part using the time filter does not perform the second noise removal correction using the time filter to the image region to which the peripheral light amount drop correction gain is not added in each image.