Iris control of a CCD camera using selective well dumping

An apparatus for applying a selective shutter to an imaging device, comprising:

• a CCD unit for receiving an image;
• means for determining a portion of said received image that presents a light overflow condition;
• and
• means for selectively reducing an amount of time that light from said portion of said image presenting said overflow condition is received so as to eliminate said overflow condition;
• wherein said CCD unit comprises a plurality of individual imaging elements, each of said individual imaging elements receiving light from said image for a time period corresponding to a predetermined duty cycle;
• wherein individual imaging elements corresponding to said portion of said received image that presents said overflow condition are connected to a current drain for a predetermined amount of time during said duty recycle to reduce the amount of time said determined portion of said imaging elements receives light from said image;
• and
• wherein said predetermined amount of time is determined in accordance with an iterative process, said predetermined amount of time being increased during consecutive images until said determined portion of said image no longer presents an overflow condition.

An apparatus for applying a selective shutter to an imaging device, comprising:

• a CCD unit for receiving an image;
• means for determining a portion of said received image that presents a light overflow condition;
• and
• means for selectively reducing an amount of time that light from said portion of said image presenting said overflow condition is received so as to eliminate said overflow condition;
• wherein said CCD unit comprises plurality of individual imaging elements, each of said individual imaging elements receiving light from said image for a time period corresponding to a predetermined duty cycle;
• wherein individual imaging elements corresponding to said portion of said received image that presents said overflow condition are connected to a current drain for a predetermined amount of time during said duty cycle to reduce the amount of time said determined portion of said imaging elements receives light from said image;
• and
• wherein said predetermined amount of time is determined by testing a single image to determine a percentage overflow, and setting said predetermined amount of time as a function of said percentage overflow.

An apparatus for applying a selective shutter to an imaging device, comprising:

• a CCD unit for receiving an image;
• means for determining a portion of said received image that presents a light overflow condition;
• and
• means for selectively reducing an amount of time that light from said portion of said image presenting said overflow condition is received so as to eliminate said overflow condition;
• wherein said CCD unit comprises a plurality of individual imaging elements, each of said individual imaging elements receiving light from said image for a time period corresponding to a predetermined duty cycle;
• and
• wherein individual imaging elements corresponding to said portion of said received image that presents said overflow condition are connected to a current drain for a predetermined amount of time during said duty cycle to reduce the amount of time said determined portion of said imaging elements receives light from said image;
• the apparatus further comprising on overflow control gate coupled between each individual imaging element and said current drain, wherein a voltage applied to said overflow control gate is reduced for said predetermined amount of time to allow charge to flow from each of said individual imaging elements corresponding to said determined portion of said image to said current drain;
• and
• wherein said predetermined amount of time is determined in accordance with an iterative process, said predetermined amount of time being increased during consecutive images until said determined portion of said image no longer presents an overflow condition.

An apparatus for applying a selective shutter to an imaging device, comprising:

• a CCD unit for receiving an image;
• means for determining a portion of said received image that presents a light overflow condition;
• and
• mean for electively reducing an amount of time that light from said portion of said image presenting said overflow condition is received so as to eliminate said overflow condition;
• wherein said CCD unit comprises a plurality of individual imaging elements, each of said individual imaging elements receiving light from said image for a time period corresponding to a predetermined duty cycle;
• and
• wherein individual imaging elements corresponding to said portion of said received image that presents said overflow condition are connected to a current drain for a predetermined amount of time during said duty cycle to reduce the amount of time said determined portion of said imaging elements receives light from said image;
• the apparatus further comprising an overflow control gate coupled between each individual imaging element and said current drain, wherein a voltage applied to said overflow control gate is reduced for said predetermined amount of time to allow charge to flow from each of said individual imaging elements corresponding to said determined portion of said image to said current drain;
• and
• wherein said predetermined amount of time is determined by testing a single image to determine a percentage overflow, and setting said predetermined amount of time as a function of said percentage overflow.

An apparatus for applying a selective shutter to an imaging device, comprising:

• a CCD unit for receiving an image;
• means for determining a portion of said received image that presents a light overflow condition;
• means for selectively reducing an amount of time that light from said portion of said image presenting said overflow condition is received so as to eliminate said overflow condition;
• and
• an edge detector for determining a precise edge of said portion of said received image that presents said overflow condition.

An apparatus for adjusting an amount of light received from a portion of an image, comprising:

• a CCD unit for receiving an image, said CCD unit comprising a plurality of individual imaging elements;
• a plurality of overflow control gates, each selectively coupling one of said plurality of individual imaging elements to an overflow current drain;
• means for determining a portion of said image that causes a respective plurality of said individual imaging elements to overflow;
• means for determining an average amount of overflow for all of said plurality of individual imaging elements in said determined portion of said image;
• and
• means for determining an appropriate amount of time for coupling each of said individual imaging elements in said determined portion of said image to said overflow current drain via said associated overflow control gate so that said individual imaging elements do not overflow.

A method for applying a selective shutter to an imaging device, comprising:

• receiving an image by a CCD unit;
• determining a portion of said received image that presents a light overflowcondition said portion comprising less than all of a plurality of pixels comprising said image;
• and
• selectively reducing an amount of time that light from said portion of said image presenting said overflow condition is received at said pixels of said CCD unit corresponding to said portion so as to eliminate said overflow condition.

A method for applying a selective shutter to an imaging device, comprising:

• receiving an image by a CCD unit;
• determining a portion of said received image that presents a light overflow condition;
• and
• selectively reducing an amount of time that light from said portion of said image presenting said overflow condition is received so as to eliminate said overflow condition;
• wherein said CCD unit comprises a plurality of individual imaging elements, each of said individual imaging elements receiving light from said image for a time period corresponding to a predetermined duty cycle;
• and
• connecting to a current drain for a predetermined amount of time during said duty cycle individual imaging elements corresponding to said portion of said received image that presents said overflow condition to reduce the amount of time said determined portion of said imaging elements receives light from said image;
• wherein said predetermined amount of time is determined in accordance with an iterative process, said predetermined amount of time being increased during consecutive images until said determined portion of said image no longer presents an overflow condition.

A method for applying a selective shutter to an imaging device, comprising:

• receiving an image by a CCD unit, said CCD unit comprising a plurality of individual imaging elements, each of said individual imaging elements receiving light from said image for a time period corresponding to a predetermined duty cycle;
• determining a portion of said received image that presents a light overflow condition;
• selectively reducing an amount of time that light from said portion of said image presenting said overflow condition is received so as to eliminate said overflow condition;
• and
• connecting to a current drain for a predetermined amount of time during said duty cycle individual imaging elements corresponding to said portion of said received image that presents said overflow condition to reduce the amount of time said determined portion of said imaging elements receives light from said image;
• wherein said predetermined amount of time is determined by testing a single image to determine a percentage overflow, and setting said predetermined amount of time as a function of said percentage overflow.

A method for applying a selective shutter to an imaging device, comprising:

• receiving an image by a CCD unit, said CCD unit comprising a plurality of individual imaging elements, each of said individual imaging elements receiving light from said image for a time period corresponding to a predetermined duty cycle;
• determining a portion of said received image that presents a light overflow condition;
• selectively reducing an amount of time that light from said portion of said image presenting said overflow condition is received so as to eliminate said overflow condition;
• connecting to a current drain for a predetermined amount of time during said duty cycle individual imaging elements corresponding to said portion of said received image that presents said overflow condition to reduce the amount of time said determined portion of said imaging elements receives light from said image;
• and
• coupling an overflow control gate between each individual imaging element and said current drain, and reducing a voltage applied to said overflow control gate for said predetermined amount of time to allow charge to flow from each of said individual imaging elements corresponding to said determined portion of said image to said current drain;
• wherein said predetermined amount of time is determined in accordance with an iterative process, said predetermined amount of time being increased during consecutive video images until said determined portion of said image no longer presents an overflow condition.

A method for applying a selective shutter to an imaging device, comprising:

• receiving an image by a CCD unit, said CCD unit comprising a plurality of individual imaging elements, each of said individual imaging elements receiving light from said image for a time period corresponding to a predetermined duty cycle;
• determining a portion of said received image that presents a light overflow condition;
• selectively reducing an amount of time that light from said portion of said image presenting said overflow condition is received so as to eliminate said overflow condition;
• connecting to a current drain for a predetermined amount of time during said duty cycle individual imaging elements corresponding to said portion of said received image that presents said overflow condition to reduce the amount of time said determined portion of said imaging elements receives light from said image;
• and
• coupling an overflow control gate between each individual imaging element and said current drain, and reducing a voltage applied to said overflow control gate for said predetermined amount of time to allow charge to flow from each of said individual imaging elements corresponding to said determined portion of said image to said current drain;
• wherein said predetermined amount of time is determined by testing a single image to determine a percentage overflow, and setting said predetermined amount of time as a function of said percentage overflow.

A method for applying a selective shutter to an imaging device, comprising:

• receiving an image by a CCD unit;
• determining a portion of said received image that presents a light overflow condition;
• selectively reducing an amount of time that light from said portion of said image presenting said overflow condition is received so as to eliminate said overflow condition;
• and
• determining a precise edge of said portion of said received image that presents said overflow condition.

A method for adjusting an amount of light received from a portion of an image, comprising:

• receiving an image by a CCD unit, said CCD unit comprising a plurality of individual imaging elements;
• selectively coupling each of a plurality of overflow control gates to each of said plurality of individual imaging elements and an overflow current drain for selective coupling;
• determining a portion of said image that causes a respective plurality of said individual imaging elements to overflow;
• determining an average amount of overflow for all of said plurality of individual imaging elements in said determined portion of said image;
• and
• determining an appropriate amount of time for coupling each of said individual imaging elements in said determined portion of said image to said overflow current drain via said associated overflow control gate so that said individual imaging elements do not overflow.