Image pickup device and chromatic aberration correction method

• US 7,397,499 B2
• Filed: 03/05/2003
• Issued: 07/08/2008
• Est. Priority Date: 03/05/2002
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Okada, Miyuki, Nakajima, Ken
• Primary Examiner(s): Vu; Ngoc-Yen
• Assistant Examiner(s): HOLT, DAVID L
• Application Number:
  US10/506,848
• Publication Number:
  US 20050168614A1
• Time in Patent Office: 1,952 Days
• Field of Search: 34820899-20816, 348/222.1
• US Class Current: 348/208.13
• CPC Class Codes: H04N 23/60 Control of cameras or camera modules
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• CPC Class Codes: H04N 23/6811 based on the image signal
• CPC Class Codes: H04N 23/6812 based on additional sensors, e.g. acceleration sensors
• CPC Class Codes: H04N 23/683 performed by a processor, e.g. controlling the readout of an image memory
• CPC Class Codes: H04N 23/687 by shifting the lens or sensor position
• CPC Class Codes: H04N 25/611 Correction of chromatic aberration
• CPC Class Codes: H04N 5/772 the recording apparatus and the television camera being placed in the same enclosure
• CPC Class Codes: H04N 5/775 between a recording apparatus and a television receiver
• CPC Class Codes: H04N 5/781 on disks or drums
• CPC Class Codes: H04N 5/907 using static stores, e.g. storage tubes or semiconductor memories H04N5/91 takes precedence
• CPC Class Codes: H04N 9/8205 involving the multiplexing of an additional signal and the colour video signal

Abstract

An image pick-up device and a chromatic aberration correcting method are provided in which a satisfactory correction processing can be performed even when the image pickup device, such as a camera, simultaneously performs shake correction. An output signal from a camera-signal processing circuit is selected by a selector switch and is supplied to a chromatic aberration correcting unit. An angular velocity due to the camera shake is detected using sensors and the detected signal is supplied to a camera shake correcting vector calculating unit. A driving state of a camera lens is supplied to a conversion-ratio calculating unit. An optical axis centered shift vector of camera lens is obtained from the camera shake correcting vector and is supplied to the correcting unit. Accordingly the picture-quality deterioration caused in the miniaturized camera lens can be compensated by processing the captured image signal, and also a satisfactory correction processing can be performed even when the camera shake correction is performed simultaneously.

Claims

1. An image pick-up apparatus comprising:

a camera lens;

image pickup means for converting image light passing through said camera lens into an electric image signal;

camera-signal processing means for processing said image signal;

chromatic signal converting means for converting an output signal from said camera-signal processing means into at least three primary color signals;

resolution changing means for enlarging or reducing a picture of each color of said primary color signals;

detection means for detecting a driving state of said camera lens and an amount of camera shake correction;

control means for controlling a changing coefficient of enlargement or reduction and an optical axis centered coordinate used in said resolution changing means depending on a detected output from said detection means;

signal conversion means for converting an output signal from said resolution changing means into an image signal for recording; and

recording and reproducing means for recording and reproducing said image signal to be recorded in a recording medium together with information on the driving state of said camera lens and an amount of camera shake correction that are detected by said detection means when taking a picture,

wherein the control means defines a changing coefficient of enlargement or reduction based on a driving state of the camera lens and a position of an optical axis based on an optical axis centered shift vector of the camera lens obtained from camera shake correcting vector and the control means controls said changing coefficient of enlargement or reduction and the optical axis centered coordinate around the position of the optical axis according to the changing coefficient, and

wherein the image pick-up apparatus has a first mode of correcting chromatic aberration when taking a picture and a second mode of correcting chromatic aberration based on reproduced information on the driving state of the camera lens and reproduced amount of camera shake correction.

2. The image pickup apparatus as claimed in claim 1,

wherein the recording and reproducing means records identifying information for discriminating the image pick-up apparatus and the image signal.

3. The image pick-up apparatus as claimed in claim 1, further comprising:

selecting means for selecting between a picture before the chromic aberration correction and a picture after the chromatic aberration correction.

4. The image pick-up apparatus as claimed in claim 1,

wherein the second mode of chromatic aberration correction is performed when the reproduced identifying information discriminates that the recording and reproduction are performed by the same image pick-up apparatus.

5. A chromatic aberration correcting method in a picture taking apparatus comprising:

converting image light passing through a camera lens into an electric image signal;

processing said image signal;

converting an output signal of the image signal into at least three primary color signals;

enlarging or reducing a picture of each color of said primary color signals

detecting a driving state of said camera lens and an amount of camera shake correction to control a conversion coefficient of said enlargement or reduction and an optical axis centered coordinate depending on the detected output;

converting the output signal into an image signal for recording;

recording and reproducing said image signal to be recorded in a recording medium together with information on the driving state of said camera lens and an amount of camera shake correction that are detected when taking a picture;

defining a changing coefficient of enlargement or reduction based on a driving state of the camera lens and a position of an optical axis based on a optical axis centered shift vector of the camera lens obtained from camera shake correcting vector and controlling said changing coefficient of enlargement or reduction and the optical axis centered coordinate around the position of the optical axis according to the changing coefficient; and

wherein the picture taking apparatus has a first mode of correcting chromatic aberration when taking a picture and a second mode of correcting chromatic aberration based on reproduced information on the driving state of the camera lens and reproduced amount of camera shake correction.

6. The method as claimed in claim 5,

wherein the recording and reproducing step records identifying information for discriminating the image pick-up apparatus and the image signal.

7. The method as claimed in claim 5, further comprising:

selecting between a picture before the chromic aberration correction and a picture after the chromatic aberration correction.

8. The method as claimed in claim 5,

wherein the second mode of chromatic aberration correction is performed when the reproduced identifying information discriminates that the recording and reproduction are performed by the same image pick-up apparatus.