Image processing of video signal for display

• US 6,480,230 B1
• Filed: 03/05/1999
• Issued: 11/12/2002
• Est. Priority Date: 03/06/1998
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Honma, Yoshihiro
• Primary Examiner(s): Miller, John
• Assistant Examiner(s): DESIR, JEAN WICEL
• Application Number:
  US09/262,929
• Time in Patent Office: 1,348 Days
• Field of Search: H04/N.701, 348/443, 348/441, 348/445, 348/454, 348/446, 348/564, 348/448, 348/452, 348/552, 348/555, 348/222, 348/715, 345/603, 382/300
• US Class Current: 348/443
• CPC Class Codes: H04N 23/63 by using electronic viewfinders
• CPC Class Codes: H04N 5/46 for receiving on more than one standard at will deflecting circuits of multi-standard receivers H04N3/27
• CPC Class Codes: H04N 7/0135 involving interpolation processes interpolation-based image scaling G06T3/4007; interpolation for video coding H04N19/587, H04N19/59

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 deterioration of a picture quality.

Claims

1. A video signal processing apparatus comprising:

storage means for storing video data comprising photographed image data and video data for super-impose;

read-out means for individually reading out said stored photographed image data and video data for super-impose;

interpolating means for interpolating said photographed image data and the video data for super-impose which are individually read out;

display control means for displaying said interpolated photographed image data and video data for super-impose onto a same picture plane; and

interpolation control means for controlling said interpolating means to match the photographed image data and the video data for super-impose in portions which are interpolated by said interpolating means to data in a portion which is not displayed by said display control means, respectively.

2. An apparatus according to claim 1, wherein when the video data is read out from said storage means, said interpolating means interpolates the data.

3. An apparatus according to claim 1, 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.