An image quality enhancement circuit and a method using inter-frame
correlativity includes a first transfer function generator calculating
histogram data corresponding to a gray level distribution with respect to
an inputted luminance signal by frame unit to generate a first transfer
function by using the histogram data, an inter-frame correlativity
calculator calculating inter-frame correlation coefficients from the
histogram data for at least one previous frame and a current frame to
output inter-frame correlation information corresponding to the
correlation coefficients, a transfer function adjustor selectively
outputting the first transfer function based on the inter-frame
correlation information outputted from the inter-frame correlativity
calculator, and a mapper correcting and outputting the inputted luminance
signal based on the transfer function outputted from the transfer
function adjustor. The image quality enhancement circuit and method using
inter-frame correlativity selectively apply a histogram equalization
process based on the correlativity between consecutive frames, thereby
enhancing an image quality.