Abstract: A method and apparatus for coding an image includes calculation of motion vectors of vertices of a patch in an image being encoded and transmitting information of horizontal and vertical components of the motion vectors of the vertices and information specifying that values of the horizontal and vertical components of a motion vector for each pixel in the patch are integral multiples of 1/d of a distance between adjacent pixels, where d is an integer not less than 2.

Abstract: A method and apparatus for coding an image includes calculation of motion vectors of vertices of a patch in an image being encoded and transmitting information of horizontal and vertical components of the motion vectors of the vertices and information specifying that values of the horizontal and vertical components of a motion vector for each pixel in the patch are integral multiples of 1/d of a distance between adjacent pixels, where d is an integer not less than 2.

Abstract: Image decoder including: a memory to store a reference image which is a previously decoded image; and a synthesizer to receive an encoded bitstream including information of I and P frames, and execute motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and the reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method, and is performed using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame. Such specifies one of two values specifying a positive or a negative rounding method. The rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoder including: a memory to store a reference image which is a previously decoded image; and a synthesizer to receive an encoded bitstream including information of I and P frames, and execute motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and the reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method, and is performed using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame; wherein the rounding method information specifies one of a plurality of values; and wherein the rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoder including: a memory to store a reference image which is a previously decoded image; and a synthesizer to receive an encoded bitstream including information of I and P frames, and execute motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and the reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method, and is performed using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame. Such specifies one of two values specifying a positive or a negative rounding method. The rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: An image decoding method comprising the steps of: receiving an encoded bitstream including information of I and P frames; and executing motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and a reference image which is a previously decoded image; wherein said motion compensation includes calculating intensity values at points where no pixels actually exist in the reference image by bilinear interpolation, the bilinear interpolation being performable using a positive rounding method and a negative rounding method, wherein the bilinear interpolation is performed using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame, and wherein the rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoding method including: receiving an encoded bitstream including information of I and P frames; and executing motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and a previously-decoded reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method; wherein the bilinear interpolation is performed using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame; wherein the rounding method information is included in a header section of the coded information of the current frame and specifies one of a plurality of values. The rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoder including: a memory to store a previously-decoded reference image; and a synthesizer to receive an encoded bitstream including information of I and P frames, and execute motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and the reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method. The bilinear interpolation is performed using rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame; wherein the rounding method information is one bit and specifies one of two values specifying a positive or negative rounding method. The rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoding method including: receiving an encoded bitstream including information of I and P frames; and executing motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and a previously-decoded reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive rounding method and a negative rounding method; wherein the bilinear interpolation is performed using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame; wherein the rounding method information is included in a header section of the coded information of the current frame; and wherein the rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoding method including: receiving an encoded bitstream including information of I and P frames; and executing motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and a previously decoded reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method, the bilinear interpolation using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame, wherein the rounding method information specifies one of two values specifying a positive or a negative rounding method; wherein the rounding method information consists of one bit; and wherein the rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoding method including: receiving an encoded bitstream including information of I and P frames; and executing motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and a reference image which is a previously decoded image; wherein the motion compensation includes calculating intensity values at points where no pixels actually exist in the reference image by bilinear interpolation, such being performable using a positive and negative rounding method; wherein the bilinear interpolation is performed using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame; wherein the rounding method information specifies one of a plurality of values; where such rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoder including: a memory to store a reference image which is a previously decoded image; and a synthesizer to receive an encoded bitstream including information of I and P frames, and execute motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and the reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation, the bilinear interpolation being performable using a positive rounding method and a negative rounding method; wherein the bilinear interpolation is performed using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame; and wherein the rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoder including: a memory to store a previously-decoded reference image; and a synthesizer to receive an encoded bitstream including information of I and P frames, and execute motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and the reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method. The bilinear interpolation is performed using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame, where such is included in a header section of the coded information of the current frame; and wherein the rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoding method including: receiving an encoded bitstream including information of I and P frames, and executing motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and a reference image which is a previously decoded image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation being performable using a positive and negative rounding method; wherein the bilinear interpolation is performed using the rounding method specified by rounding method information included in the encoded bitstream of a P current frame; wherein the rounding method information specifies one of two values specifying a positive rounding method or a negative rounding method; and wherein the rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoding method including: receiving an encoded bitstream including information of I and P frames; and executing motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and a previously-decoded reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method. The bilinear interpolation is performed using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame. The rounding method information is included in a header section, consists of one bit, and specifies a positive or negative rounding method; and wherein the rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoder including: a memory to store a previously-decoded reference image; and a synthesizer to receive an encoded bitstream including information of I and P frames, and execute motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method. The bilinear interpolation is performed using rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame, where such is included in a header section of the coded information of the current frame and specifies one of a plurality of values. The rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoder including: a memory to store a previously-decoded reference image; and a synthesizer to receive an encoded bitstream including information of I and P frames, and execute motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method, specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame. The rounding method information is included in a header section, consists of one bit, and specifies one of a positive rounding method and a negative rounding method. The rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoder including: a memory to store a reference image which is a previously decoded image; and a synthesizer to receive an encoded bitstream including information of I and P frames, and execute motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and the reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method, and is performed using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame; wherein the rounding method information specifies one of a plurality of values; and wherein the rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoder including: a memory to store a previously-decoded reference image; and a synthesizer to receive an encoded bitstream including information of I and P frames, and execute motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method, specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame. The rounding method information is included in a header section, consists of one bit, and specifies one of a positive rounding method and a negative rounding method. The rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.

Abstract: Image decoding method including: receiving an encoded bitstream including information of I and P frames; and executing motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and a previously-decoded reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method. The bilinear interpolation is performed using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame. The rounding method information is included in a header section, consists of one bit, and specifies a positive or negative rounding method; and wherein the rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.