Back to results
US 5,856,849 AGranted
Digital processing of video signals for performing aspect ratio conversion
AssigneeSony Corporation
InventorKenichi Aihara
Life of this patent
Estimating the term…
Abstract
Aspect ratio converting circuits store a digital signal at a first clock rate into a memory, wherein the digital signal represents a picture having a first aspect ratio. In the first mode, the digital signal is retrieved from the memory during one horizontal period on the basis of the first clock rate. In the second mode, in one horizontal period, a portion of the digital signal is retrieved on the basis of a second clock rate related to a conversion ratio between the first aspect ratio and a second aspect ratio of the picture.
Claims16
A digital signal processing device for processing a video picture, comprising:
- memory means having a storage capacity of at least one horizontal line of said video picture for storing a digital signal representing said video picture having a first aspect ratio;
- clock generating means for generating a write clock signal and a first read clock signal each having a first data rate, and for generating a second read clock signal having a second data rate related to said first data rate by a preselected conversion ratio between said first aspect ratio and a second aspect ratio;
- and
- control means being operative in a first mode to store, at said first data rate, said digital signal in said memory means during a horizontal line period of said write clock signal, and to retrieve, at said first data rate, and following the storage thereof, said digital signal during said horizontal line period such that said digital signal is output at said first data rate from said memory means as said digital signal representing said video picture having said first aspect ratio and being delayed by said horizontal line period;
- said control means being further operative in a second mode to store, at said first data rate, said digital signal in said memory means during said horizontal line period, and to retrieve, at said second data rate, a portion of said digital signal during said horizontal line period such that said digital signal is output at said second data rate from said memory means as said digital signal representing said video picture having said second aspect ratio and being delayed by said horizontal line period.
2 more elements
Imaging apparatus, comprising:
- imaging means for generating, at a first rate, a digital signal representing a video picture having a first aspect ratio based on an object image;
- memory means having a storage capacity of at least one horizontal line of said video picture for storing said digital signal;
- clock generating means for generating a write clock signal and a first read clock signal each having a first data rate, and for generating a second read clock signal having a second data rate related to said first data rate by a preselected conversion ratio between said first aspect ratio and a second aspect ratio;
- and
- control means being operative in a first mode to store, at said first data rate, said digital signal in said memory means during a horizontal line period of said write clock signal, and to retrieve, at said first data rate, and following the storage thereof, said digital signal during said horizontal line period such that said digital signal is output at said first data rate from said memory means as said digital signal representing said video picture having said first aspect ratio and being delayed by said horizontal line period;
- said control means being further operative in a second mode to store, at said first data rate, said digital signal in said memory means during said horizontal line period, and to retrieve, at said second data rate, a portion of said digital signal during said horizontal line period such that said digital signal is output at said second data rate from said memory means as said digital signal representing said video picture having said second aspect ratio and being delayed by said horizontal line period.
3 more elements
Imaging apparatus, comprising:
- imaging means for generating a digital signal representing a video picture having a first aspect ratio based on an object image;
- first converting means for providing a predetermined group delay to the generated digital signal and for extracting at least a first portion of samples in a horizontal direction of said video picture defined by said digital signal;
- second converting means for providing said predetermined group delay to the generated digital signal and for extracting at least a second portion of samples in said horizontal direction independently of said first converting means;
- display means connected to said second converting means for displaying said video picture based on said digital signal outputted from said second converting means;
- operation means for setting at least a first and a second operation mode for said first and second converting means;
- and
- control means for controlling said first and second converting means such that said first converting means extracts less samples from said digital signal than said second converting means when said first operation mode is set by said operation means.
4 more elements
Imaging apparatus, comprising:
- imaging means for generating a digital signal representing a video picture having a first aspect ratio based on an object image;
- first converting means for providing a predetermined group delay to the generated digital signal and for extracting at least a first portion of samples in a horizontal direction of said video picture defined by said digital signal;
- second converting means for providing said predetermined group delay to the generated digital signal and for extracting at least a second portion of samples in said horizontal direction independently of said first converting means;
- display means connected to said second converting means for displaying said video picture based on said digital signal outputted from said second converting means;
- operation means for setting at least two operation modes for said first and second converting means;
- and
- control means for controlling said first and second converting means such that said first converting means extracts more samples from said digital signal than said second converting means when one of said operation modes is set by said operation means.
4 more elements
Imaging apparatus, comprising:
- imaging means for generating a digital signal representing a video picture having a first aspect ratio based on an object image;
- first converting means for providing a predetermined group delay to the generated digital signal and for extracting at least a first portion of samples in a horizontal direction of said video picture defined by said digital signal;
- second converting means for providing said predetermined group delay to the generated digital signal and for extracting at least a second portion of samples in said horizontal direction independently of said first converting means;
- display means connected to said second converting means for displaying said video picture based on said digital signal outputted from said second converting means;
- operation means for setting at least a first and a second operation mode for said first and second converting means;
- and
- control means for controlling said first and second converting means based on said first and second operation modes such that said first converting means extracts less samples from said digital signal than said second converting means in said first operation mode, and said first converting means extracts more samples from said digital signal than said second converting means in said second operation mode.
4 more elements
Dependencies are inferred from the claim text.