Image processing of video signal for display

Abstract

A video signal processing apparatus which can perform a liquid crystal display without a deterioration of a picture quality even when a CCD sensor of the NTSC system is used at the time of the PAL system is provided. The video signal processing apparatus has a 1H delay circuit and a selecting circuit. Upon PAL system, by switching the selecting circuit once every seven lines and performing a pre-interpolation, the lines are compensated from 485 lines (vertical) of the NTSC system to 575 lines (vertical) of the PAL system. In case of performing the liquid crystal display, the timing of an interpolation (LCOMP) signal is synchronized with the timing of the EN signal upon PAL system so as to coincide the portion of the lines to be compensated from 485 lines (vertical) of the NTSC system to 575 lines (vertical) of the PAL system with the portion to be thinned out at a rate of 1 line per 7 lines in the liquid crystal display. Thus, even if the CCD sensor of the NTSC system is used upon PAL system, the liquid crystal display panel can display an image without a deterioration of a picture quality.

What is claimed is:  
     
         1 . An image processing apparatus comprising: 
 interpolating means for interpolating a video signal that is supplied; and    output means for thinning out the video signal interpolated by said interpolating means and outputting the thinned video signal,    wherein a position on an image to be interpolated by said interpolating means and a position to be thinned out by said output means are concerned.    
     
     
         2 . An apparatus according to  claim 1 , wherein said video signal that is supplied is a signal according to the NTSC standard.  
     
     
         3 . An apparatus according to  claim 2 , wherein said interpolating means forms a video signal of the number of lines adapted to the PAL standard by an interpolation.  
     
     
         4 . An apparatus according to  claim 1 , wherein said output means thins out the image signal in accordance with the number of lines of a liquid crystal display.  
     
     
         5 . An apparatus according to  claim 4 , further comprising liquid crystal display means for displaying the video signal which is outputted by said output means.  
     
     
         6 . An apparatus according to  claim 1 , further comprising generating means for generating the video signal which is supplied to said interpolating means.  
     
     
         7 . An apparatus according to  claim 6 , wherein said generating means includes a photoelectric converting device.  
     
     
         8 . A video signal processing apparatus comprising: 
 storage means for storing video data;    read-out means for reading out said stored video data;    interpolating means for interpolating said read-out video data;    display control means for displaying said interpolated video data; and    interpolation control means for controlling said interpolating means so as to match a portion to be interpolated by said interpolating means to a portion which is not displayed by said display means when said video data is displayed.    
     
     
         9 . An apparatus according to  claim 8 , wherein: 
 said storage means stores the video data comprising photographed image data and video data for super-impose;    said read-out means individually reads out said stored photographed image data and video data for super-impose;    said interpolating means interpolates said photographed image data and the video data for superimpose which are individually read out;    said display means displays said interpolated photographed image data and video data for super-impose onto a same picture plane; and    said interpolation control means matches the photographed image data and the video data for superimpose in portions which are interpolated by said interpolating means to data in a portion which is not displayed by said display means, respectively.    
     
     
         10 . An apparatus according to  claim 8 , wherein when the video data is read out from said storage means, said interpolating means interpolates the data.  
     
     
         11 . An apparatus according to  claim 9 , wherein after a process to display said photographed image data and said video data for super-impose onto the same picture plane was performed, said interpolating means interpolates the data.  
     
     
         12 . An image signal processing method comprising the steps of: 
 storing video data;    reading out said stored video data;    interpolating said read-out video data; and    when said interpolated video data is displayed, matching said portion to be interpolated to a portion that is not displayed.    
     
     
         13 . A method according to  claim 12 , wherein said video data is data adapted to the NTSC standard.  
     
     
         14 . A method according to  claim 13 , wherein in said interpolating step, the data is interpolated so as to obtain data adapted to the PAL standard.  
     
     
         15 . An image processing apparatus comprising: 
 processing means for processing a supplied image signal in accordance with a set broadcasting standard;    display means for displaying the image signal processed by said processing means; and    control means for controlling said display means in accordance with the set broadcasting standard.    
     
     
         16 . An apparatus according to  claim 15 , wherein said broadcasting standard includes the PAL system and the NTSC system.  
     
     
         17 . An apparatus according to  claim 15 , further comprising setting means for setting said broadcasting standard.  
     
     
         18 . An apparatus according to  claim 17 , wherein said display means is liquid crystal display means.