An image sensing apparatus comprising: an image sensor having a light-shielded pixel area (61, 62) and non-light-shielded pixel area; and an image processing device comprising: means for receiving an image obtained from the image sensor; a frequency component resolution section adapted to resolve the image by wavelet transform into two or more frequency components, including a low frequency component, a vertical direction high frequency component, a horizontal direction high frequency component, and a diagonal direction high frequency component; a noise amount calculation section (1231a, 1232a) adapted to calculate a noise amount for the vertical direction high frequency component based on the vertical direction high frequency component in the light-shielded pixel area and a noise amount for the horizontal direction high frequency component based on the horizontal direction high frequency component in the light-shielded pixel area; a noise suppression section (1233, 1234) adapted to suppress a noise component for the vertical direction high frequency component in the non-light-shielded pixel area based on the noise amount for the vertical direction high frequency component and to suppress a noise component for the horizontal direction high frequency component in the non-light-shielded pixel area based on the noise amount for the horizontal direction high frequency component; and a frequency component synthesis section adapted to synthesize by inverse wavelet transform the noise-suppressed vertical direction high frequency component in the non-light-shielded pixel area, the noise-suppressed horizontal direction high frequency component in the non-light-shielded pixel area and the low frequency component, and the diagonal direction high frequency component to thereby form an output image. an image sensor having a light-shielded pixel area (61, 62) and non-light-shielded pixel area; and an image processing device comprising: means for receiving an image obtained from the image sensor; a frequency component resolution section adapted to resolve the image by wavelet transform into two or more frequency components, including a low frequency component, a vertical direction high frequency component, a horizontal direction high frequency component, and a diagonal direction high frequency component; a noise amount calculation section (1231a, 1232a) adapted to calculate a noise amount for the vertical direction high frequency component based on the vertical direction high frequency component in the light-shielded pixel area and a noise amount for the horizontal direction high frequency component based on the horizontal direction high frequency component in the light-shielded pixel area; a noise suppression section (1233, 1234) adapted to suppress a noise component for the vertical direction high frequency component in the non-light-shielded pixel area based on the noise amount for the vertical direction high frequency component and to suppress a noise component for the horizontal direction high frequency component in the non-light-shielded pixel area based on the noise amount for the horizontal direction high frequency component; and a frequency component synthesis section adapted to synthesize by inverse wavelet transform the noise-suppressed vertical direction high frequency component in the non-light-shielded pixel area, the noise-suppressed horizontal direction high frequency component in the non-light-shielded pixel area and the low frequency component, and the diagonal direction high frequency component to thereby form an output image. means for receiving an image obtained from the image sensor; a frequency component resolution section adapted to resolve the image by wavelet transform into two or more frequency components, including a low frequency component, a vertical direction high frequency component, a horizontal direction high frequency component, and a diagonal direction high frequency component; a noise amount calculation section (1231a, 1232a) adapted to calculate a noise amount for the vertical direction high frequency component based on the vertical direction high frequency component in the light-shielded pixel area and a noise amount for the horizontal direction high frequency component based on the horizontal direction high frequency component in the light-shielded pixel area; a noise suppression section (1233, 1234) adapted to suppress a noise component for the vertical direction high frequency component in the non-light-shielded pixel area based on the noise amount for the vertical direction high frequency component and to suppress a noise component for the horizontal direction high frequency component in the non-light-shielded pixel area based on the noise amount for the horizontal direction high frequency component; and a frequency component synthesis section adapted to synthesize by inverse wavelet transform the noise-suppressed vertical direction high frequency component in the non-light-shielded pixel area, the noise-suppressed horizontal direction high frequency component in the non-light-shielded pixel area and the low frequency component, and the diagonal direction high frequency component to thereby form an output image.