Abstract: A decoding apparatus of decoding encoded data per unit from among units included in a picture is provided. The decoding apparatus includes at least one processor. A buffer is coupled to the processor and stores the encoded data. The processor decodes, from a bitstream including the encoded data, a first flag which indicates whether a removal time of the encoded data from the buffer is set per unit. A second flag indicates whether an interval between removal times of the units is constant when the removal time is set per unit. Control information of the bitstream includes common-interval information when the second flag indicates that the interval is constant. The common-interval information is distinct from the second flag and indicates a constant time interval between removal times of any two consecutive units.

Abstract: An image coding method includes: selecting a first picture from plural pictures; setting a first temporal motion vector prediction flag which is associated with the first picture and is a temporal motion vector prediction flag indicating whether or not temporal motion vector prediction is to be used, to indicate that the temporal motion vector prediction is not to be used, and coding the first temporal motion vector prediction flag; coding the first picture without using the temporal motion vector prediction; and coding a second picture which follows the first picture in coding order, with referring to a motion vector of a picture preceding the first picture in coding order being prohibited.

Abstract: A coding method comprises: transforming an input signal; quantizing a transformed output signal; and entropy coding quantized coefficients, wherein the transforming includes: generating a first transformed output signal by performing a first transform on the input signal using a first transform coefficient; and generating a second transformed output signal by performing, using a second transform coefficient, a second transform on a first partial signal which is a part of the first transformed output signal, and outputting the transformed output signal including the generated second transformed output signal and a second partial signal which is the remaining part of the first transformed output signal other than the first partial signal, and wherein, in the generating and outputting, at least one of (i) the first partial signal that is a target signal range for the second transform and (ii) the second transform coefficient is adaptively determined temporally or spatially.