1. An image pickup apparatus comprising: an image-pickup unit configured to capture an image; a display unit configured to display an image at a resolution lower than a resolution at which the image-pickup unit can capture the image; and an image processing unit configured to perform image processing for displaying the image captured by the image-pickup unit on the display unit, wherein the image processing unit includes an extraction section that extracts an edge component from the image, an edge processing section that performs processing for enhancing the edge component by performing low-pass filter processing on the edge component after performing full-wave rectification processing on the edge component, a combining section that combines the enhanced edge component with the image to generate a composite image, and a resolution conversion section that performs resolution conversion of the composite image so as to match a resolution of the composite image with the resolution of the display unit.