Electronic zooming device
View Patent ↗A vertical zooming unit vertically resizes image data by a tap number m. A horizontal zooming unit horizontally resizes the vertically-resized image data outputted from the vertical zooming unit by a tap number n. A tap coefficient setting unit arbitrarily sets respective tap coefficients when the vertical zooming unit or the horizontal zooming unit is operated. A memory stores the image data therein. A memory controller controls input and output of the image data among the memory, the vertical zooming unit and the horizontal zooming unit.
1. An electronic zooming device comprising:
a vertical zooming unit for vertically resizing image data by a tap number m;
a horizontal zooming unit for horizontally resizing the vertically-resized image data outputted from the vertical zooming unit by a tap number n;
a tap coefficient setting unit for arbitrarily setting respective tap coefficients when the vertical zooming unit or the horizontal zooming unit is operated;
a memory in which the image data is stored; and
a memory controller for controlling input and output of the image data among the memory, the vertical zooming unit and the horizontal zooming unit, wherein:
the image data is RGB Bayer-array data, and
the vertical zooming unit and the horizontal zooming unit scale-down resize the image data in a state where:
a filter tap number is (4n+1);
a size of scale-down resizing is 1/(2n+1);
only an odd-numbered coefficient of the respective tap coefficients from an end thereof is set to a real number; and
an even-numbered coefficient of the respective tap coefficients from the end thereof is set to zero, so that the reduced image data is generated while RGB Bayer array of the image data is maintained.
2. The electronic zooming device as claimed in claim 1 ,
wherein the tap coefficient setting unit arbitrarily sets the respective tap coefficients in accordance with a size to be resized when the vertical zooming unit or the horizontal zooming unit is operated.
3. The electronic zooming device as claimed in claim 1 ,
wherein
the tap coefficient setting unit sets such a tap coefficient that an arbitrary two-dimensional filtering process is executed to the image data without resizing the image data as the tap coefficient.
4. The electronic zooming device as claimed in claim 1 ,
wherein
the tap coefficient setting unit sets such a tap coefficient that information of the image data in one screen area is detected without resizing the image data and thereby an arbitrary two-dimensional filtering process is independently executed for each of pixels as the tap coefficient.
5. An imaging device comprising:
an imaging unit for generating image data through an imaging processing; and
the electronic zooming device as claimed in claim 1 supplied with the image data generated by the imaging unit.