NOISE LEVEL CONTROL DEVICE FOR A WIDE DYNAMIC RANGE IMAGE AND AN IMAGE PROCESSING SYSTEM INCLUDING THE SAME

摘要

An image processing device includes a first wide dynamic range (WDR) image generation block, a control signal generator, and a second WDR image generation block. The first WDR image generation block processes a long-exposure image signal to generate a first image signal, processes a short-exposure image signal using a second weight value to generates a second image signal, and to synthesize the first image signal and the second image signal to generate a first WDR image signal. The control signal generator calculates a difference between the second weight value and a reference weight value and generates control signals according to a result of the calculation. The second WDR image generation block adjusts a noise level of the first WDR image signal using the control signals and generates a second WDR image signal according to a result of the adjustment.

主权项

1. An image processing device comprising:
a first wide dynamic range (WDR) image generation block configured to process a long-exposure image signal using a first weight value, to generate a first image signal according to a result of the processing on the long-exposure image signal, to process a short-exposure image signal using a second weight value, to generate a second image signal according to a result of the processing on the short-exposure image signal, and to synthesize the first image signal and the second image signal to generate a first WDR image signal; a control signal generator configured to calculate a difference between the second weight value and a reference weight value, and to generate control signals according to a result of the calculation; and a second WDR image generation block configured to adjust a noise level of the first WDR image signal using the control signals, and to generate a second WDR image signal according to a result of the adjustment, wherein the long-exposure image signal is generated using a first exposure time, and wherein the short-exposure image signal is generated using a second exposure time shorter than the first exposure time.