Image reversing unit

H - Electricity – 04 – N

Patent

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Details

H04N 9/74 (2006.01) H04M 11/00 (2006.01)

Patent

CA 2063793

Each line of a television signal has a sequence of interleaved luminance and chrominance samples according to a given format (Y0U0Y1V0 etc.) which are written into a one line store (1) using a first address sequence and then read out using a second address sequence such that the luminance samples are in reverse order, (and likewise the chrominance); however their interleaving conforms to the given format. The second address sequence is used also for writing in the next incoming line, which is then read out using the first sequence, the two sequences alternating throughout a field period. Useful in videotelephony and videoconferencing.

Chaque ligne d'un signal de télévision comporte une séquence d'échantillons entrelacés de luminance et de chrominance dans un format donné (Y0U0Y1V0, etc.), qui sont écrits dans un registre d'une ligne (1) selon une première séquence d'adresse, puis lus selon une seconde séquence d'adresse, de sorte que les échantillons de luminance se situent dans l'ordre inverse (comme dans le cas de la chrominance); leur entrelacement est toutefois conforme au format donné. La seconde séquence d'adresse est également utilisée pour l'écriture sur la ligne d'entrée suivante, qui est ensuite lue à l'aide de la première séquence, les deux séquences alternant tout au long d'une période de champ. Utile en vidéotéléphonie et en vidéoconférence.

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