Appeal No. 1999-2691
Application No. 08/590,348
a sample-and-hold circuit for sampling and holding said image
data signal for a predetermined output period;
an A/D converter for converting an analog signal outputted by
said sample-and-hold circuit corresponding to a held image data
signal into a digital signal;
a reference signal generator for generating a reference
signal;
a timing generator for generating a read timing signal which
is used to read out image data from the image sensor for a
predetermined reading period and a hold timing signal which
controls hold timing of the sample-and-hold circuit according to
said reference signal; and
an A/D conversion timing generator for generating a conversion
timing signal according to said reference signal for controlling
operation of said A/D converter;
wherein said timing generator changes either said read timing
signal or said hold timing signal so that the same data from the
starting point of the output of the image data is held, when
changing the output period of the image data for image enlargement
or reduction processing.
7. An image signal processing apparatus, comprising:
an image sensor for reading an image and outputting image data
representing the read image as an image data signal;
a sample-and-hold circuit for sampling and holding said image
data signal;
an A/D converter for converting an analog signal outputted by
said sample-and-hold circuit corresponding to a held image data
signal into a digital signal; and
means for preventing said A/D converter from inputting said
analog signal at the same time that said analog signal changes its
value.
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