Image resolution conversion apparatus
View Patent ↗In an image resolution conversion apparatus, a region-determining section establishes an initial value used for determining a region where a new pixel is to be generated based on the number of pixels in a non-line direction included in a pixel group used for converting the resolution attribute of fields, and a resolution conversion magnification ratio. The region-determining section accumulates an integration parameter corresponding to the resolution conversion magnification ratio onto the obtained initial values under the predetermined condition. The region-determining section outputs: a region-control signal; and the newly-established-pixel-position signal, successively based on the accumulation result.
1. An image resolution conversion apparatus for converting an original image into an image having a resolution corresponding to a preset resolution conversion magnification ratio by generating a new pixel by interpolating pixel values relating to a plurality of pixels included in a pixel group forming a predetermined size of pixel region, the apparatus comprising:
a pixel-values storage section for storing the pixel values of each interlaced input original image as a unit of an interlaced field;
a region-determining section for setting initial values used for determining a new-pixel-generating region; accumulating onto the initial values integration parameters corresponding to the resolution conversion magnification ratio successively under a predetermined condition; and outputting a first determination signal and a second determination signal successively based on the accumulation results, the initial values being set based on the number of pixels in the pixel group in a non-line direction orthogonal to a line direction of interlacing, the attribute of fields, and the resolution conversion magnification ratio, the first determination signal relating to the position of the new-pixel-generating region for generating the new pixel, and the second determination signal relating to the position of the new pixel in the new-pixel-generating region;
a pixel-values-reading control section for generating an output-control signal based on the first determination signal, the output-control signal allowing the pixel values of the pixel group corresponding to the new-pixel-generating region output from the pixel-values storage section;
an arithmetic interpolating section for calculating an interpolated pixel value of the new pixel corresponding to the resolution conversion magnification ratio based on the pixel values of the pixel group and the second determination signal, the pixel values being output from the pixel-values storage section in accordance with the output-control signal;
wherein the number of pixels in the pixel group in the non-line direction is obtained from a sum of 1 and a quotient obtained by dividing the number of pixels in line directions by 2, and
the pixel-values storage section collectively outputs pixel values of the pixel group corresponding to the number of a product of the number of pixels in a line direction and the number of pixels in the non-line direction.
2. The image resolution conversion apparatus according to claim 1 , wherein the region-determining section establishes an intermediate position parameter indicating an intermediate position between pixels adjacent in the non-line direction to each other in the field and generates the initial values and the second determination signal based on the intermediate position parameter.