Abstract: A resolution is determined for a picture (10) by repeating determination of a first and second signal power of a first and a second residual signal and a power ratio of the first and second signal powers until the power ratio (?) exceeds a threshold value (T). An input signal is initially set as pixel values of the picture (10). The first residual signal is representative of a difference between the input signal and a half-band filtered version thereof and the second residual signal is representative of a difference between a resampled signal and a half-band filtered version thereof. The resampled signal is a downsampled and half-band filtered version of the input signal. The input signal is set as the resampled signal if ??T. The resolution is then determined based on a resolution of the set input signal when ?>T.

Abstract: A video fidelity measure is determined for a video sequence (1) by determining distorted and original difference pictures (30, 40) as pixel-wise differences between pixels (14, 24) in a distorted picture (10) and corresponding pixels (24) in an original picture (20) and between pixels in a preceding distorted picture (11) and corresponding pixels in a preceding original picture (21). First and second maps representing distortions in pixel values between the distorted and original pictures (10, 20) and between distorted and original difference pictures (30, 40) are determined. Third and sixth maps are determined as respective aggregations of local variabilities in pixels values in the distorted and original pictures (10, 20) and local variabilities in pixels values in the distorted and original difference pictures (30, 40), respectively. The video fidelity measure is then determined based on the first to third and sixth maps.

Abstract: A video fidelity measure is determined for a video sequence (1) by determining distorted and original difference pictures (30, 40) as pixel-wise differences between pixels (14, 24) in a distorted picture (10) and corresponding pixels (24) in an original picture (20) and between pixels in a preceding distorted picture (11) and corresponding pixels in a preceding original picture (21). First and second maps representing distortions in pixel values between the distorted and original pictures (10, 20) turd between distorted and original difference pictures (30, 40) are determined. Third and sixth maps are determined as respective aggregations of local variabilities in pixels values in the distorted and original pictures (10, 20) and local variabilities in pixels values in the distorted and original difference pictures (30, 40), respectively. The video fidelity measure is then determined based on the first to third and sixth maps.

Abstract: A resolution is determined for a picture (10) by repeating determination of a first and second signal power of a first and a second residual signal and a power ratio of the first and second signal powers until the power ratio (?) exceeds a threshold value (T). An input signal is initially set as pixel values of the picture (10). The first residual signal is representative of a difference between the input signal and a half-band filtered version thereof and the second residual signal is representative of a difference between a resampled signal and a half-band filtered version thereof. The resampled signal is a downsampled and half-band filtered version of the input signal. The input signal is set as the resampled signal if ??T. The resolution is then determined based on a resolution of the set input signal when ?>T.