Video image transforming method and apparatus

Claim 2

Method for transforming a video image characterized by the steps of: obtaining respective positions with respect to a first coordinate of four vertexes (corners) (P1, P2, P3, P4) of respective first small quadrangular regions (SA) to be divided from an input video image; obtaining respective positions with respect to a second coordinate of four vertexes (corners) (Q1, Q2, Q3, Q4) of respective second small quadrangular regions (SB) to be transformed correspondingly to the first small quadrangular regions by calculating with one or respective transforming functions; calculating respective parameters corresponding to the relation between the respective first small regions (SA) and the respective second small regions (SB) according to respective pairs of two vectors being congruent with respective pairs of adjacent two sides of the second small quadrangular regions, the respective pairs of adjacent two sides constituting a pair of triangles together with a diagonal of the quadrangular: transforming video information at each point within the respective first small regions (SA) into each corresponding point within the respective second small regions (SB) according to said respective parameters so as to constitute the output video image.

Claim 3

Method according to claim 1, characterized in that the respective pair of two vectors is congruent with respective pair of adjacent two sides included in a triangular region divided from the second small quadrangular regions so as to contain longer diagonal thereof.

Claim 4

Apparatus for transforming a video image characterized by: first memory means (4) into which input image data is written according to a first write address signal so as to store the input image data and from which the input image data is read out according to a first read address signal: means (58) for generating the first write address signal; means (11-14) for obtaining respective positions with respect to a first coordinate of four vertexes (corners) of respective first small quadrangular regions to be divided from an input video image; means (3) for obtaining respective positions with respect to a second coordinate of four vertexes (corners) of respective second small quadrangular regions to be transformed correspondingly to the first small quadrangular regions by calculating with one of respective transforming functions; means (2, 3) for calculating respective parameters corresponding to the relation between the respective first small regions (SA) and the respective second small regions (SB) according to respective pairs of two vectors being congruent with respective pairs of adjacent two sides of the second small quadrangular regions, the respective pairs of adjacent two sides being constituting a pair of triangles together with a diagonal of the quadrangular; second memory means (5) into which output image data is written according to a second write address signal so as to store the output image data and from which the output image data is read out so as to produce output video image according to a second read address signal; means (26, 29, 34, 35) for generating the second write address signal for respective samples within the respective second small regions (SB) and for generating the first read address signal for respective samples within the respective first small regions according to the respective parameters and the second write address signal; means for generating the second read address signal.

Claim 5

Apparatus for transforming a video image characterized by: first memory means (4) into which input image data is written according to a first write address signal so as to store the input image data and from which the input image data is read out according to a first read address signal: means (58) for generating the first write address signal; means (11-14) for obtaining respective positions with respect to a first coordinate of four vertexes (corners) of respective first small quadrangular regions to be divided from an input video image; means (3) for obtaining respective positions with respect to a second coordinate of four vertexes (corners) of respective second small quadrangular regions to be transformed correspondingly to the first small quadrangular regions by calculating with one of respective transforming functions; means (2, 3) for calculating respective parameters corresponding to the relation between the respective first small regions (SA) and the respective second small regions (SB) according to respective pairs of two vectors being congruent with respective pairs of adjacent two sides of the second small quadrangular regions, the respective pairs of adjacent two sides being constituting a pair of triangles together with a diagonal of the quadrangular; second memory means (5) into which output image data is written according to a second write address signal so as to store the output image data and from which the output image data is read out so as to produce output video image according to a second read address signal; means (26, 29, 34, 35) for generating the second write address signal for respective samples within the respective second small regions (SB) and for generating the first read address signal for respective samples within the respective first small regions according to the respective parameters and the second write address signal; means for generating the second read address signal.

Claim 6

Apparatus according to claim 3, characterized in that the respective pair of two vectors is congruent with a respective pair of adjacent two sides included in a triangular region divided from the second small quadrangular regions (SB) so as to contain the longer diagonal thereof.

Claim 7

Apparatus for producing interpolation data at respective interpolation points to be interpolated between respective sampling points according to the sampling data at the respective sampling points characterized by: means (4) provided with respective distance data corresponding to respective distances from respective sampling points to respective interpolation points and for producing compensating distance data according to respective distances from respective sampling points to respective interpolation points: calculating means (2) provided with the respective sampling data and the compensating distance data and for producing the respective interpolation data according to the respective sampling data and the compensating distance data; filter means (102) provided with the respective interpolation data and for extracting respective output data having a predetermined frequency component from the respective interpolation data; first adding means (111) provided with the respective output data of said filter means (102) and respective weighting data corresponding to the respective distances from the respective sampling points to the respective interpolation points and for adding the respective weights to the respective output data of said filter means (102) so as to produce respective output data; second adding means (113) provided with the respective interpolation data and the output of said first adding means- and for adding the respective output data of said first adding means (111) and the respective interpolation data.

Claim 8

Apparatus for producing interpolation data at respective interpolation points to be interpolated between respective sampling points according to the sampling data at the respective sampling points characterized by: means (4) provided with respective distance data corresponding to respective distances from respective sampling points to respective interpolation points and for producing compensating distance data according to respective distances from respective sampling points to respective interpolation points: calculating means (2) provided with the respective sampling data and the compensating distance data and for producing the respective interpolation data according to the respective sampling data and the compensating distance data; filter means (102) provided with the respective interpolation data and for extracting respective output data having a predetermined frequency component from the respective interpolation data; first adding means (111) provided with the respective output data of said filter means (102) and respective weighting data corresponding to the respective distances from the respective sampling points to the respective interpolation points and for adding the respective weights to the respective output data of said filter means (102) so as to produce respective output data; second adding means (113) provided with the respective interpolation data and the output of said first adding means- and for adding the respective output data of said first adding means (111) and the respective interpolation data.

Claim 9

Apparatus for producing an interpolation data at respective interpolation points to be interpolated between respective sampling points according to sampling data at respective sampling points characterized by: first filtering means having first filter characteristics and provided with the respective sampling data and for filtering the respective sampling data and for producing first output data; second filtering means having second filter characteristics and provided with the respective sampling data and for filtering the respective sampling data and for producing second output data; first interpolation means (104) provided with the first output data of said first filtering means and for producing first interpolation data by a linear interpolation method according to the first output data of said first filtering means: second interpolation means (105) provided with second output data of said second filtering means and for producing second interpolation data by a sinusoidal interpolation method according to the second output data of said second filtering means; adding means (150) for adding the first interpolation data from said first interpolation means (104) and the second interpolation data from said second interpolation means (105).

Claim 10

Apparatus for producing an interpolation data at respective interpolation points to be interpolated between respective sampling points according to sampling data at respective sampling points characterized by: first filtering means having first filter characteristics and provided with the respective sampling data and for filtering the respective sampling data and for producing first output data; second filtering means having second filter characteristics and provided with the respective sampling data and for filtering the respective sampling data and for producing second output data; first interpolation means (104) provided with the first output data of said first filtering means and for producing first interpolation data by a linear interpolation method according to the first output data of said first filtering means: second interpolation means (105) provided with second output data of said second filtering means and for producing second interpolation data by a sinusoidal interpolation method according to the second output data of said second filtering means; adding means (150) for adding the first interpolation data from said first interpolation means (104) and the second interpolation data from said second interpolation means (105).

Claim 11

Apparatus for filtering an input video image, whereby the input video image is transformed into an output video image, characterized by: a first filtering system (111, 112, 113) having first filtering means for filtering input data thereof in vertical direction and second filtering means for filtering input data thereof in horizontal direction; said first filtering system provided with the input video image data and for producing first output data being filtered in the vertical and horizontal directions; a second filtering system (115, 116, 117) having third filtering means for filtering the input data thereof in a first slant direction of left hand side down and right hand side up and fourth filtering means for filtering the input data thereof in a second slant direction of left hand side up and right hand side down; said second filtering system provided with the input video image data and for producing second data being filtered in the first and second slant directions; whereby said first to fourth filtering means are controlled in the filter characteristics thereof according to magnitude of transformation; first weighting means (110) for weighting the first output data of said first filtering system and for producing first weighted output signal; second weighting means (119) for weighting the second output data of said second filtering system and for producing second weighted output signal; whereby said first and second weighting means (110, 119) are controlled in the weighting thereof according to the directions of the transformation; and adding means (120) for adding the first weighted output data and the second weighted output data and for producing output video image data.

Claim 12

Apparatus for filtering an input video image, whereby the input video image is transformed into an output video image, characterized by: a first filtering system (111, 112, 113) having first filtering means for filtering input data thereof in vertical direction and second filtering means for filtering input data thereof in horizontal direction; said first filtering system provided with the input video image data and for producing first output data being filtered in the vertical and horizontal directions; a second filtering system (115, 116, 117) having third filtering means for filtering the input data thereof in a first slant direction of left hand side down and right hand side up and fourth filtering means for filtering the input data thereof in a second slant direction of left hand side up and right hand side down; said second filtering system provided with the input video image data and for producing second data being filtered in the first and second slant directions; whereby said first to fourth filtering means are controlled in the filter characteristics thereof according to magnitude of transformation; first weighting means (110) for weighting the first output data of said first filtering system and for producing first weighted output signal; second weighting means (119) for weighting the second output data of said second filtering system and for producing second weighted output signal; whereby said first and second weighting means (110, 119) are controlled in the weighting thereof according to the directions of the transformation; and adding means (120) for adding the first weighted output data and the second weighted output data and for producing output video image data.