Electronic camera with over-sampling filter and method for over-sampling and interpolating electronic camera image data
First Claim
1. An electronic camera generating output image data representing an image of an object, the output image data being for display by a display device including an array of display pixels each having a square aspect ratio, the electronic camera comprising:
- solid-state imaging means for generating analog image data in response to light received from the object and in response to a sampling clock having a sampling clock rate, the solid-state imaging means, including an array of imaging pixels each having a rectangular aspect ratio;
analog-to-digital converting means for converting the analog image data into digital image data at a clock rate corresponding to the sampling clock rate;
digital video processing means, connected to the analog-to-digital converting means, for processing the digital image data to generate video image data;
over-sampling means for over-sampling the digital image data N times to generate over-sampled image data;
interpolating means for interpolating the over-sampled image data from the over-sampling means to provide the output image data at a display clock rate, the display clock rate being different from the sampling clock rate and being chosen, in relation to the sampling clock rate, such that, when the output image data are displayed by the display device including the array of display pixels each having a square aspect ratio, the image is geometrically undistorted.
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Abstract
A method and apparatus for processing image data produced by an electronic camera (such as image data read from a CCD device of an electronic camera) by over-sampling and then interpolating the data to convert the format and/or resolution of the data. The format of the image data may be converted to a format suitable for display on a computer monitor or the like. The invention enables the aspect ratio of a frame of image data output from a CCD device to be converted to 1:1. Preferably, the image data are filtered by a filter having a characteristic opposite to the frequency characteristic of the interpolation function, and then interpolated so that the interpolation can be carried out at a portion where the change of the frequency characteristic is small, thereby improving the image quality of the fully processed output image. The invention can be implemented in an electronic camera including an over-sampling filter (4) for over-sampling input data N times and an interpolation circuit (5) for interpolating the output from the over-sampling filter.
156 Citations
11 Claims
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1. An electronic camera generating output image data representing an image of an object, the output image data being for display by a display device including an array of display pixels each having a square aspect ratio, the electronic camera comprising:
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solid-state imaging means for generating analog image data in response to light received from the object and in response to a sampling clock having a sampling clock rate, the solid-state imaging means, including an array of imaging pixels each having a rectangular aspect ratio; analog-to-digital converting means for converting the analog image data into digital image data at a clock rate corresponding to the sampling clock rate; digital video processing means, connected to the analog-to-digital converting means, for processing the digital image data to generate video image data; over-sampling means for over-sampling the digital image data N times to generate over-sampled image data; interpolating means for interpolating the over-sampled image data from the over-sampling means to provide the output image data at a display clock rate, the display clock rate being different from the sampling clock rate and being chosen, in relation to the sampling clock rate, such that, when the output image data are displayed by the display device including the array of display pixels each having a square aspect ratio, the image is geometrically undistorted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification