Methods and systems for adaptive cropping

An encoder comprising circuitry to encode a bitstream for decoding by a compliant decoder:

• the bitstream including a first coded picture having a first resolution and a second coded picture having a second resolution, a sequence parameter set associated with both the first and second coded pictures, a first picture parameter set associated with the first picture, and a second picture parameter set associated with the second picture, the sequence parameter set including a first set of parameters defining a first cropping window, the first set of parameters including, a top offset, a bottom offset, a left offset and a right offset;
• the decoder being configured to:
• receive the bitstream,
• decode the first coded picture and store the first picture as a reference picture;
• determine a vertical scaling factor as a function of the top offset and bottom offset parameters in the sequence parameter set
• determine a horizontal scaling factor as a function of the left offset and right offset parameters in the sequence parameter set;
• determine a predictor for the second picture from the reference picture and the vertical scaling factor and horizontal scaling factor;
• decode the second coded picture using the predictor, and
• output for display the first picture as cropped in accordance with the first set of parameters defining the first cropping window in the sequence parameter set.