Process and apparatus for the insertion of insets into the image supplied by a digital scan converter

A digital image converter for insertion of an inset image portion into a basic image defined by video image data supplied to said digital image converter including a television type image display, an image memory storing, in digital form, a basic image to displayed on the television type display, processing means including storage means for storing video information as the video information is supplied to the digital image converter, coordinate conversion means for generating Cartesian coordinates for the video information which is supplied to the digital image converter in accordance with polar coordinates,

• said processing means including means for sampling received video information, said means for sampling, sampling video image data for a basic image at a first frequency and sampling video image data for an inset image portion at a second, higher frequency, and
• means responsive to said sampling means for storing video information associated with an inset image portion in said storage means with a magnification factor k relative to said basic image, where k>1,
• said coordinate conversion means including means for generating coordinates for an inset image portion employing parameters which are functions of a desired position for the inset image portion in the basic image and the magnification factor k for the inset image portion, and
• said digital image converter further including means for writing said video information associated with an inset image portion to said image memory at addresses in said image memory defined by coordinates produced in said means for generating.

A process for insertion of an inset image portion into an image generated by a digital image converter including a television type image display, an image memory storing, in digital form, a basic image to displayed on the television type display, processing means including storage means for sampling and storing video information as the video information is supplied to the digital image converter, coordinate conversion means for generating Cartesian coordinates for the video information which is supplied to the digital image converter in accordance with polar coordinates, said process including the steps of:

• (a) sampling video information received by the digital image converter,
• (b) storing video information associated with an inset image portion in said storage means with a magnification factor k relative to said basic image, where k>1,
• (c) generating coordinates for the basic image,
• (d) generating coordinates for an inset image portion employing parameters which ae functions of a desired position for the inset image portion in the basic image and the magnification factor k for the inset image portion,
• (e) writing, at a first rate, said video information associated with an inset image portion from said storage means to said image memory at addresses in said image memory defined by coordinates produced in said step (d), and
• writing, at a second rate, lower than said first rate, said video information associated with a basic image from said storage means to said image memory at addresses in said image memory defined by coordinates produced in said step (c).

A digital image converter for insertion of an inset image portion into a basic image defined by video image data supplied to said digital image converter including a television type image display, an image memory storing, in digital form, a basic image to displayed on the television type display, processing means including storage means for storing video information as the video information is supplied to the digital image converter, coordinate conversion means for generating Cartesian coordinates for the video information which is supplied to the digital image converter in accordance with polar coordinates,

• wherein said processing means includes means for sampling received video information, and
• means responsive to said sampling means for storing video information associated with an inset image portion in said storage means with a magnification factor k relative to said basic image, where k>1,
• wherein said coordinate conversion means includes means for generating coordinates for a basic image and for an inset image portion, said means for generating coordinates for said inset image portion employing parameters which are functions of a desired position for the inset image portion in the basic image and the magnification factor k for the inset image portion, and said digital image converter further including:
• means for writing said video information associated with an inset image portion to said image memory at a first rate at addresses in said image memory defined by coordinates produced in said means for generating and for writing said video information associated with a basic image to said image memory at a second rate, lower than said first rate, at addresses in said image memory defined by coordinates produced in said means for generating.