An imaging apparatus and an image method thereof are provided. The imaging apparatus includes an image pickup including a pixel, the pixel being configured to accumulate a charge. The imaging apparatus further includes an image processor configured to perform image processing based on the accumulated charge to generate an image, a signal generator, and a controller configured to determine an exposure pattern of the pixel, and control the signal generator to generate a reset signal based on the determined exposure pattern. The pixel is configured to accumulate the charge based on the reset signal.