Abstract: A digital signal conversion apparatus converts an input video signal having a first dynamic range into a converted video signal having a dynamic range which is smaller than the first dynamic range. In particular, the conversion apparatus includes a digital signal processor (DSP) and a knee point determiner. The DSP inputs the input video signal and converts such signal into the converted video signal based on a selected one of a plurality of input/output (I/O) characteristic functions stored in the DSP. Furthermore, the DSP generates brightness information based on the magnitude of the first dynamic range of input video signal. The knee point determiner inputs the brightness information and generates knee point information based on the brightness information. As a result, the DSP selects one of the I/O characteristic functions in accordance with the knee point information such that the DSP can appropriately convert the input video signal into the converted video signal.

Abstract: The present invention relates to a digital image signal processing method and apparatus, and more particularly, to an edge compensation method and apparatus of an image signal capable of improving the quality of an image in instruments performing a digital image signal process. An edge compensation method of a digital image signal processing system includes the steps of generating a luminance signal from a luminance matrix by receiving digital red, green and blue R, G and B image signals, generating a vertical edge signal in real-time by sequentially delaying the luminance signal in units of one horizontal line, generating a horizontal edge signal in real-time by sequentially delaying the luminance signal delayed in units of one horizontal line during a given time period, generating a composite image edge signal by adding the vertical edge signal to the horizontal edge signal, and outputting an edge-compensated luminance signal by adding the composite image edge signal to an uncompensated luminance signal.