Image signal processing apparatus
First Claim
1. An image signal processing apparatus inputted with original image data in which plural color components periodically appear in each column of sampling points arranged in a matrix at a repetition period of a specified number of lines, and for generating target image data different from the original image data in vertical sampling period, comprising:
- a data holding part for holding plural lines of the inputted original image data, which are in a line range of a specified width and have a specified positional relation to each other;
a target image data generation part for generating the target image data at a target line of a position corresponding to the line range of the original image by weighting the original image data of the plural lines held in the data holding part for each line and adding them to each other; and
a factor setting part for setting, according to the target line, weighting factors for the respective lines used in the weighting and addition performed in the target image data generation part, wherein the factor setting part determines the weighting factors on the basis of a trap characteristic of attenuating, in the target image data, a frequency component corresponding to a vertical sampling frequency of the original image and the repetition period of the color components, and a mutual positional relation between a vertical sampling point corresponding to each line of the original image data held in the data holding part and a vertical sampling point corresponding to the target line.
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Accused Products
Abstract
In an image signal processing apparatus, line memories conventionally provided at a latter stage of the apparatus in order to convert a VGA image signal into a CIF image signal are eliminated. Image data of the VGA held in a unit of one line in plural line memories 60 provided in a digital signal processing circuit are weighted and added in a VLPF 62. A factor setting part 76 of the VLPF 62 changes weighting factors according to a positional relation between a position of a generation object line of the CIF and a line of the VGA. The weighting factors are determined so that a characteristic of trapping ½ of a vertical sampling frequency fv is also obtained. The VLPF 62 uses the weighting factors to trap fv/2, and changes the position of the vertical sampling point to a position of each line of the CIF image.
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Citations
8 Claims
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1. An image signal processing apparatus inputted with original image data in which plural color components periodically appear in each column of sampling points arranged in a matrix at a repetition period of a specified number of lines, and for generating target image data different from the original image data in vertical sampling period, comprising:
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a data holding part for holding plural lines of the inputted original image data, which are in a line range of a specified width and have a specified positional relation to each other;
a target image data generation part for generating the target image data at a target line of a position corresponding to the line range of the original image by weighting the original image data of the plural lines held in the data holding part for each line and adding them to each other; and
a factor setting part for setting, according to the target line, weighting factors for the respective lines used in the weighting and addition performed in the target image data generation part, wherein the factor setting part determines the weighting factors on the basis of a trap characteristic of attenuating, in the target image data, a frequency component corresponding to a vertical sampling frequency of the original image and the repetition period of the color components, and a mutual positional relation between a vertical sampling point corresponding to each line of the original image data held in the data holding part and a vertical sampling point corresponding to the target line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification