Method and system for effecting a transformation of a video image

Claim 1

A method for effecting a transformation of a video image on a video screen, characterized in the steps of: a) storing an input video image (OIG, IM) in a memory device; b) defining a two-dimensional address plane in a memory area of said memory device; c) providing a first line (L1) on said address plane to divide said address plane into first and second regions; d) providing second and third lines (L21, L22) on said first and second regions of said address plane in parallel to said first line (L1); e) calculating address data of said address plane for providing transferred address data so that said address data of said first region are symmetrically transformed with respect to said first line, and said address data between said first and second lines and between said first and third linesare non-linear compression transformed along an axis perpendicular to said first line; f) calculating transformed address data between said first and second lines and between said first and third lines when address data between said first and second lines and between said first and third lines are non-linear compression transformed along an axis perpendicular to said first line; and g) reading out said input video image from said memory device and generating an output video image according to said transformed address data, whereby said output image can be viewed such as to be turned over along said first line.

Claim 2

A method for effecting a transformation of a video image on a video screen, characterized in the steps of: a) storing an input video image (OIG, IM) in a memory device; b) defining a two-dimensional address plane in a memory area of said memory device; c) providing a first line (L1) on said address plane to divide said address plane into first and second regions; d) providing second and third lines (L21, L22) on said first and second regions of said address plane in parallel to said first line (L1); e) calculating address data of said address plane for providing transferred address data so that said address data of said first region are symmetrically transformed with respect to said first line, and said address data between said first and second lines and between said first and third linesare non-linear compression transformed along an axis perpendicular to said first line; f) calculating transformed address data between said first and second lines and between said first and third lines when address data between said first and second lines and between said first and third lines are non-linear compression transformed along an axis perpendicular to said first line; and g) reading out said input video image from said memory device and generating an output video image according to said transformed address data, whereby said output image can be viewed such as to be turned over along said first line.

Claim 4

A system for effecting a transformation of a video image on a video screen, characterized in; a) first means (2) for storing input image data (IM); b) second means (5) for sequentially generating a positional output image address signal; c) third means (6) for presetting parameters representing a locus on which an output of the video image is turned over as if a sheet of paper were folded up; d) fourth means (7) for sequentially generating position designation signals indicative of a displacement of the input image on a two-dimensional plane; e) fifth means (8) for calculating values including a positional reference point signal of the input image (IM) on the two-dimensional plane on the basis of which the input image is displaced, rotation transform matrix data based on a given angle (6) through which the two-dimensional plane is rotated, and a radius data (r) on a virtual cylindrical image (CYL) on which part of the input image is wound, said positional reference point signal, rotation transform matrix data, and radius data being based on preset parameters derived from said third means (6) and position designation signals derived from said fourth means (7); f) sixth means (3) for executing transform arithmetic operations for transformable parts of an output video image, said transformable parts being defined by a first part representing a rear part of the output video image which is wound on an upper surface of said cylindrical image (CYL) as viewed through the video screen, a second part representing a front part of the output video image which is outside of a projection portion of the cylindrical image (CYL), a third part representing the front part of the output video image which is wound on a lower surface of said cylindrical image (CYL) as viewed through the video screen, and a fourth part representing the rear part of the output image which is outside of said wound first part so as to overlap on said second part, on the basis of the reference point signal, rotation transform matrix data, and radius data of said cylindrical image (CYL) calculated by said fifth means (8) and reading out the input image data the contents of which are to be the output image and specified by the positional output image address signal generated by said second means;and g) seventh means for displaying the input video image whose data are stored in said first means (2) and read out from said first means (2) by said sixth means (5) according to the positional output image address signal on the video screen so that the whole video screen can be viewed as if a sheet of paper were being folded up.

Claim 5

A system for effecting a transformation of a video image on a video screen, characterized in; a) first means (2) for storing input image data (IM); b) second means (5) for sequentially generating a positional output image address signal; c) third means (6) for presetting parameters representing a locus on which an output of the video image is turned over as if a sheet of paper were folded up; d) fourth means (7) for sequentially generating position designation signals indicative of a displacement of the input image on a two-dimensional plane; e) fifth means (8) for calculating values including a positional reference point signal of the input image (IM) on the two-dimensional plane on the basis of which the input image is displaced, rotation transform matrix data based on a given angle (6) through which the two-dimensional plane is rotated, and a radius data (r) on a virtual cylindrical image (CYL) on which part of the input image is wound, said positional reference point signal, rotation transform matrix data, and radius data being based on preset parameters derived from said third means (6) and position designation signals derived from said fourth means (7); f) sixth means (3) for executing transform arithmetic operations for transformable parts of an output video image, said transformable parts being defined by a first part representing a rear part of the output video image which is wound on an upper surface of said cylindrical image (CYL) as viewed through the video screen, a second part representing a front part of the output video image which is outside of a projection portion of the cylindrical image (CYL), a third part representing the front part of the output video image which is wound on a lower surface of said cylindrical image (CYL) as viewed through the video screen, and a fourth part representing the rear part of the output image which is outside of said wound first part so as to overlap on said second part, on the basis of the reference point signal, rotation transform matrix data, and radius data of said cylindrical image (CYL) calculated by said fifth means (8) and reading out the input image data the contents of which are to be the output image and specified by the positional output image address signal generated by said second means;and g) seventh means for displaying the input video image whose data are stored in said first means (2) and read out from said first means (2) by said sixth means (5) according to the positional output image address signal on the video screen so that the whole video screen can be viewed as if a sheet of paper were being folded up.

Claim 9

The system according to anyone of claims 3 to 6, characterized in that said positional output image address signal generated by said fourth means (7) and positional reference point signal calculated by said fifth means (6) are signals representing addresses of respective picture elements on a raster screen.

Claim 11

The system according to anyone of claims 4 to 8, characterized in that said second rotation transform circuit (23) processes the rotation transform together with a fold back transform processing for the positional address data outputted from said non-linear compression - inverse transform circuit (20) corresponding to said first and fourth parts of the output video image.

Claim 12

The system according to anyone of claims 4 to 9, characterized in that said second predetermined angle is a minus value of said first predetermined angle.

Claim 13

The system according to anyone of claims 4 to 10, characterized in that a coordinate system of the two-dimensional plane is changed whenever the transform processing is carried out.

Claim 14

A method for effecting a transformation of a video image on a video screen, characterized in the steps of: a) defining a two-dimensional address plane within a memory area; b) storing input video image within said memory area so that each data on picture element thereof is placed on the corresponding address; c) virtually placing a cylinder shaped image (CYL) whose radius lr) of a section thereof is varied on the address plane defined in said step a) and winding a part of said address plane on said cylinder shaped image (CYL); d) displacing said cylinder shaped image (CYL) along a predetermined direction on said address plane with its radius (r) varied with time so that the address plane is turned over along the predetermined direction; e) transforming parallel translation and rotation for the whole address plane, a non-linear compression with respect to the predetermined direction for front and rear parts of the address plane which are wound on a surface of said cylinder shaped image ( C YL) as viewed vertically through the video screen, and a fold back of the rear part of the address plane; f) inverse transforming the transformed address data obtained in said step e) so as to unfold the output video image and reading out inverse transformed image address data with a priority taken for the turned over part of output image as input image address data; and g) displaying the input image on the video screen on the basis of the input image address, whereby the video image on the video screen can be viewed as if a page were turned over.

Claim 15

A method for effecting a transformation of a video image on a video screen, characterized in the steps of: a) defining a two-dimensional address plane within a memory area; b) storing input video image within said memory area so that each data on picture element thereof is placed on the corresponding address; c) virtually placing a cylinder shaped image (CYL) whose radius lr) of a section thereof is varied on the address plane defined in said step a) and winding a part of said address plane on said cylinder shaped image (CYL); d) displacing said cylinder shaped image (CYL) along a predetermined direction on said address plane with its radius (r) varied with time so that the address plane is turned over along the predetermined direction; e) transforming parallel translation and rotation for the whole address plane, a non-linear compression with respect to the predetermined direction for front and rear parts of the address plane which are wound on a surface of said cylinder shaped image ( C YL) as viewed vertically through the video screen, and a fold back of the rear part of the address plane; f) inverse transforming the transformed address data obtained in said step e) so as to unfold the output video image and reading out inverse transformed image address data with a priority taken for the turned over part of output image as input image address data; and g) displaying the input image on the video screen on the basis of the input image address, whereby the video image on the video screen can be viewed as if a page were turned over.