US 7,126,642 B2Granted

Image display apparatus

AssigneeSony Corporation

InventorsAya Takechi, Hiroyuki Kojima, Nobuo Ueki

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Abstract

There is provided an image display apparatus which automatically detects a picture defect and shifts an image region to eliminate the picture defect. The image display apparatus includes a memory unit for temporarily storing an input image signal, a memory control unit for controlling a readout start address for the memory unit, a display unit to which the image signal read out of the memory unit is supplied, a detection unit of an aspect ratio of the input image signal, and an address control signal generation unit to which an aspect ratio detection output is supplied from the detection unit and which generates a readout start address control signal for the memory unit from the input image signal. When the input image signal having an aspect ratio different from an aspect ratio of image screen display of the display unit is supplied, a readout start address is controlled on the basis of the address control signal generated by the address control signal generation unit. By this, an image region is automatically shifted and a picture defect is prevented without changing the aspect ratio of the input image signal when an object is a human figure.

Claims4

Dependent claims

An image display apparatus, comprising:

memory means for temporarily storing an input image signal;
memory control means for controlling a readout start address for the memory means;
display means having an image display screen to which an image signal read out of the memory means is input, the image display screen configured to display the input image signal by increasing an amount of overscan when an aspect ratio of the input image signal is different from an aspect ratio of said image display screen, so as not to change the aspect ratio of the input image signal;
detection means for detecting the aspect ratio of the input image signal;
and
address control signal generation means to which an aspect ratio detection output is supplied from the detection means, for generating a readout start address control signal for the memory means from the input image signal,
the address control signal generation means including
a feature detection means for detecting a feature from said input image signal,
a picture defect judgment means for judging a picture defect of the feature based on an output of the feature detection means and for shifting an image display position on the image display screen, the picture defect caused by the increasing of the amount of the overscan, and
a screen shift amount determination means for determining, on the basis of the aspect ratio of the input image signal, a shift amount when the image display position is shifted by the picture defect judgment means
wherein the readout start address for the memory means is controlled on the basis of the address control signal generated by the readout start address control signal generation means.

8 more elements

An image display apparatus, comprising:

memory means for temporarily storing an input image signal;
memory control means for controlling a readout start address for the memory means;
display means having an image display screen, which has an aspect ratio of 4:3, to which the image signal read out of the memory means is input, the image display screen configured to display the input image signal by increasing an amount of overscan when an aspect ratio of the input image signal is different from the aspect ratio of the image display screen, so as to not change the aspect ratio of the input image signal;
telop signal detection means for detecting a telop signal superimposed on the input image signal;
and
address control signal generation means for generating an address control signal to control a readout start address for the memory means when the telop signal is detected;
the address control signal generation means including
a feature detection means for detecting a feature from said input image signal,
a picture defect judgment means for judging a picture defect of the feature based on an output of the feature detection means and for shifting an image display position on the image display screen, said picture defect caused by said increasing of the amount of said overscan, and
a screen shift amount determination means for determining, on the basis of the aspect ratio of the input image signal, a shift amount when the image display position is shifted by the picture defect judgment means
wherein the readout start address for the memory means is controlled on the basis of the address control signal generated by the address control signal generation means.

8 more elements

Dependencies are inferred from the claim text.