Gradation correction method and apparatus

H - Electricity – 04 – N

Patent

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H04N 9/69 (2006.01) H04N 1/00 (2006.01) H04N 1/60 (2006.01) H04N 5/202 (2006.01) H04N 9/77 (2006.01)

Patent

CA 2078200

- 1 - In video signal processing a gradation correction apparatus for processing R, G, and B input signals includes a luminance signal conversion device for obtaining the original luminance signal, which is before gamma conversion, from the input signals, and a luminance gamma conversion device for gamma converting the original luminance signal to desired gradation characteristics to obtain a gamma converted luminance signal. The ratio of the gamma converted luminance signal to the original luminance signal is obtained, and this ratio is multiplied by each of the R, G, and B input signals for obtaining primary gradation-corrected R, G, and B signals. The difference between each of the R, G, and B input signals and the original luminance signal is obtained and the gamma converted luminance signal is added to each of these differences for obtaining secondary gradation-corrected R, G, and B signals. Final gradation-corrected R, G, B signals are obtained based on the primary and secondary gradation-corrected R, G, and B signals. The result is a system in which effective brightness adjustment is possible within the dynamic range of the image, without changing its hue or saturation characteristics.

Dans un système de traitement de signaux vidéo, un dispositif de correction de gradation utilisé pour le traitement des signaux R, V et B d'entrée comporte un dispositif de conversion de signaux de luminance permettant d'obtenir le signal de luminance originel, c'est-à-dire le signal de luminance existant avant la conversion gamma, à partir des signaux d'entrée, et un dispositif de conversion gamma du signal de luminance originel, dispositifs qu'il utilise pour obtenir les caractéristiques de gradation désirées. Le rapport entre le signal de luminance à conversion gamma et le signal de luminance originel est calculé, puis est multiplié par chacun des signaux R, V et B d'entrée pour donner les signaux R, V et B à correction de gradation primaires. La différence entre chacun des signaux d'entrée R, V et B et le signal de luminance originel est calculée et le signal de luminance à conversion gamma est ajouté à chacune de ces différences pour donner les signaux R, V et B à correction de gradation secondaires. Les signaux R, V et B à correction de gradations finals sont obtenus à partir des signaux R, V et B à correction de gradation primaires et secondaires. Le résultat est un système dans lequel un réglage efficace de la luminosité est possible dans la dynamique de l'image sans altération de ses caractéristiques de teinte ou de saturation.

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