Image Signal Processor And Image Signal Processing Method

Abstract

The disclosed is to provide an image signal processor and its method in which the enhancement of resolution and the effective reduction of noise are compatible. The image signal processor is provided with an edge character detector that detects a character of an edge of an object, an image signal frequency zone limiter that executes a noise removing process, an image signal frequency zone enhancer that executes a resolution enhancing process and a gain controller that changes each intensity of the image signal frequency zone limiter and the image signal frequency zone enhancer according to an output result of the edge character detector.

1 - 13 . (canceled) 
   
   
       14 . An image signal processor based upon a pixel interpolation system that inputs a digital image signal and generates an interpolated signal, comprising:
 a first interpolator that acquires an extrapolated point from original data for interpolation before generated interpolated data and acquires the interpolated data;   a second interpolator that acquires an extrapolated point from original data for interpolation after generated interpolated data and acquires the interpolated data;   a third interpolator that outputs the interpolated data using interpolated data before and after the generated interpolated data, wherein the third interpolator detects a slope of the original data for interpolation, determines whether a series of signals are convex upward or convex downward, selects smaller one of output of the first interpolator and output of the second interpolator when a series of the original data for interpolation is convex upward, and outputs larger one of the output of the first interpolator and the output of the second interpolator as an extrapolated interpolated signal when a series of the original data for interpolation is convex downward;   an edge character detector that detects a character of an edge of an object; and   a gain controller that changes a ratio in intensity of an output pixel signal from an extrapolated interpolated signal generator and an output pixel signal from the third interpolator according to an output result of the edge character detector and executes an adding process.   
   
   
       15 . An imaging device comprising:
 an image sensor that receives light from an object and converts it to an electric signal;   an A/D converter that converts a pixel signal output from the image sensor to digital data;   a digital signal processor for camera that generates a luminance signal and a color-difference signal based upon the digitalized pixel signal; and   a line memory that stores pixel signals on a plurality of lines as one line of which a horizontal scanning direction is set;   wherein a zoom process is executed according to the interpolated signal generation of  claim 14 .   
   
   
       16 . (canceled) 
   
   
       17 . (canceled) 
   
   
       18 . An image signal processor that inputs a digital image signal and generates a shape compensated signal, comprising:
 a line memory that stores pixel signals on a plurality of lines as one line of which a horizontal scanning direction is set;   a horizontal scanning secondary differentiator that generates a signal secondarily differentiated in a horizontal scanning direction based upon an image signal output from the line memory;   a vertical scanning secondary differentiator that generates a signal secondarily differentiated in a vertical scanning direction based upon the image signal output from the line memory;   an edge character detector that detects a character of an edge of an object; and   a gain controller that changes the ratio in intensity of a pixel signal output from the horizontal scanning secondary differentiator, the image signal output from the vertical scanning secondary differentiator and the input digital image signal according to an output result of the edge character detector and executes an adding process.