Electronic zooming apparatus and digital camera
View Patent ↗A digital camera includes a memory, and pixel data cut out from the memory is subjected to ½ horizontal thinning processing by a ½ horizontal thinning circuit when a zooming magnification is equal to or larger than “2”, and the thinned pixel data is written to an image buffer. A zooming circuit performs zooming processing on the thinned pixel data stored in the image buffer. Here, when the zooming magnification is smaller than “2”, the zooming circuit performs the zooming processing on original pixel data being read from the memory and then stored in the image buffer.
1. An electronic zooming apparatus, comprising:
a first reader for reading a predetermined amount of original pixel data which is horizontally continuous from a designated pixel decided on the basis of a zooming magnification out of image data stored in a first memory;
a horizontal thinner for outputting thinned pixel data by performing 1/n times (n is natural number) thinning processing in a horizontal direction on said original pixel data read by said first reader when a zooming magnification is equal to or larger than n, and outputting said original pixel data as it is when said zooming magnification is smaller than n;
a second memory being written with said thinned pixel data or said original pixel data;
a second reader for reading said original pixel data from said second memory when said zooming magnification is smaller than n, and reading said thinned pixel data from said second memory when said zooming magnification is equal to or larger than n; and
a zooming processor for producing a zoomed image by performing zooming processing on said thinned pixel data or said original pixel data read by said second reader.
2. An electronic zooming apparatus according to claim 1 , wherein said n is a power of two.
3. A non-transitory recording medium which is readable by a computer of a digital camera, and which executes said digital camera to execute the following steps of:
a first reading step for reading a predetermined amount of original pixel data which is horizontally continuous from a designated pixel decided on the basis of a zooming magnification out of image data stored in a first memory;
a horizontal thinning step for outputting thinned pixel data by performing 1/n times (n is natural number) thinning processing in a horizontal direction on said original pixel data read by said first reading step when a zooming magnification is equal to or larger than n, and outputting said original pixel data as it is when said zooming magnification is smaller than n, said thinned pixel data being written to a second memory, said second memory further being written with said original pixel data;
a second reading step for reading said original pixel data from said second memory when said zooming magnification is smaller than n, and reading said thinned pixel data from said second memory when said zooming magnification is equal to or larger than n; and
a zooming processing step for producing a zoomed image by performing zooming processing on said thinned pixel data or said original pixel data read by said second reading step.
4. An electronic zooming method including following steps of:
a first reading step for reading a predetermined amount of original pixel data which is horizontally continuous from a designated pixel decided on the basis of a zooming magnification out of image data stored in a first memory;
a horizontal thinning step for outputting thinned pixel data by performing 1/n times (n is natural number) thinning processing in a horizontal direction on said original pixel data read by said first reading step when a zooming magnification is equal to or larger than n, and outputting said original pixel data as it is when said zooming magnification is smaller than n, said thinned pixel data being written to a second memory, said second memory further being written with said original pixel data;
a second reading step for reading said original pixel data from said second memory when said zooming magnification is smaller than n, and reading said thinned pixel data from said second memory when said zooming magnification is equal to or larger than n; and
a zooming processing step for producing a zoomed image by performing zooming processing on said thinned pixel data or said original pixel data read by said second reading step.