Color video camera using common white balance control circuitry in negative and postive image photoimaging modes
AssigneeCanon Kabushiki Kaisha
InventorKan Takaiwa
Life of this patent
Estimating the term…
Abstract
A color video camera having an automatic white balance adjusting function and operating with selection of modes including a negative-to-positive reversal mode of shooting the color negative film to obtain the positive picture, wherein in the negative-to-positive reversal mode, the color signals output from the image sensor are amplified by the amplifiers whose gains have been changed from the values for an ordinary object shooting mode to values suited for shooting the negative film.
Claims31
An image sensing apparatus which has a positive mode and a negative mode, comprising:
- a. image sensing means for sensing an image of an object to form an image signal which includes a plurality of color signal components;
- b. signal processing means for processing the image signal to produce a video signal, said processing means changing a polarity of the video signal between the positive mode and the negative mode;
- c. level adjusting means for adjusting levels of the plurality of color signal components;
- d. signal forming means for forming a control signal to control said level adjusting means in accordance with a color temperature condition of the object;
- and
- e. changing means arranged between said level adjusting means and said control signal forming means for changing a gain of the control signal between the positive mode and the negative mode.
An image sensing apparatus which has a positive mode and a negative mode comprising:
- a. image sensing means for sensing an image of an object to form an image signal which includes a plurality of color signal components;
- b. level shifting means for operating on and shifting DC levels of color signals output from said image sensing means in the negative mode to remove from the image signal the influence of colors of orange component with which a base of color negative film is colored;
- c. signal processing means for processing the image signal to produce a video signal, said processing means inverting the video signal between the positive mode and the negative mode;
- d. level adjusting means for adjusting levels of the plurality of color signal components;
- and
- e. control signal forming means for forming a control signal to control said level adjusting means by using color signals according to the color signal components which are processed through said level shifting means and said level adjusting means.
An image sensing apparatus which has a positive mode and a negative mode, comprising:
- a. image sensing means for sensing an image of an object to form color image signals;
- b. level shifting means for operating one and shifting DC levels of color signals output from said image sensing means in the negative mode to remove from the image signal the influence of colors of orange component with which a base of color negative film is colored;
- and
- c. white balance control means for forming a white balance control signal to control white balance of the color image signal by using color signals according to the color signal components which are processed through said level shifting means and said white balance control means.
An image pickup apparatus which has a positive mode and a negative mode, comprising:
- (a) image sensing means for sensing an image of an object to form color image signals;
- (b) level shifting means for operating on and shifting DC levels of the color signals to cancel a color component corresponding to a color of a film base in the negative mode;
- and
- (c) white balance control means for controlling white balance of said color signals based on the color signal levels adjusted by a level adjusting means.
An image sensing apparatus which has a positive mode and a negative mode, comprising:
- a. image sensing means for sensing an image of an object to form an image signal which includes a plurality of color signal components;
- b. signal processing means for processing the image signal to produce a video signal, said processing means changing a polarity of the video signal between the positive mode and the negative mode;
- c. level adjusting means for operating on and adjusting levels of the plurality of color signal components;
- d. signal forming means for forming a control signal to control said level adjusting means in accordance with a color temperature condition of the object;
- and
- e. changing means changing level adjusting condition of said level adjusting means between the positive mode and the negative mode.
Dependencies are inferred from the claim text.