1. An image processing apparatus, comprising:
a table generation unit that generates a table in which a coefficient set including predetermined weighting coefficients and pixels contained in a resolution converted image are related to each other on the basis of a size of an input image and a size of a resolution converted image;
a coefficient selecting unit that selects a particular coefficient set to be applied for a calculation of a pixel value in the resolution converted image out of a plurality of coefficient sets on the basis of a table generated by the table generation unit; and
a pixel value calculating unit that calculates pixel values to be used in the resolution converted image resulting from the resolution conversion of the input image on the basis of the particular coefficient set selected by the coefficient selecting unit and a plurality of pixel values contained in the input image, wherein
the table relates pixels contained in the resolution converted image to one coefficient set included in a coefficient set group,
the coefficient set group is composed of plural coefficient sets relating to various basic resolution conversions,
the table is composed of orthogonal tables in two directions, and a size of the table corresponds to a size of the resolution converted image, and
the orthogonal tables in two directions relate pixels identified by coordinate in the resolution converted image to the particular coefficient set to be used for calculating a pixel value of the pixel.
2. The image processing apparatus according to claim 1, wherein a total sum of weighting coefficients contained in each of the coefficient sets is equal to 1, and a denominator of the weighting coefficients is a power of 2.
3. The image processing apparatus according to claim 1, wherein the plurality of coefficient sets differing from one another have at least one weighting coefficient of the same value.
4. The image processing apparatus according to claim 1, wherein a shift value for the input image is related to each of the coefficient sets; and
the pixel value calculating unit determines, on the basis of the shift value relating to a coefficient set selected by the coefficient selecting unit, a pixel position of the input image to be used for calculating pixel values of a resolution converted image.
5. The image processing apparatus according to claim 1, further having:
a range setting unit that determines a range of selectable coefficient sets,
wherein the coefficient selecting unit selects an applicable coefficient set out of multiple coefficient sets contained in the range set by the range setting unit.
6. The image processing apparatus according to claim 1, further having:
a filtering processing unit that applies filtering that depends on the input image’s condition or a user’s instruction to the pixel value of the resolution converted image calculated by the pixel value calculating unit.
7. The image processing apparatus according to claim 1, further having:
a gray scale converting unit that, where the input image is a binary image, convert the input image to a gray scale image,
wherein the pixel value calculating unit calculates the pixel value of the resolution converted image on the basis of the pixel value of the image converted into a gray scale image by the gray scale converting unit,
the apparatus further having:
a binary converting unit that applies binary conversion by a binarization method depending on the input image’s condition to the pixel value of the resolution converted image calculated by the pixel value calculating unit.
8. The image processing apparatus according to claim 1, further having:
a binary converting unit that applies binary conversion, where an output image is a binary image, by varying a binarization threshold value in proportion to a ratio of the area between the input image and the output image.
9. A non-transitory computer readable medium storing a program for causing a computer to execute a process comprising:
generating a table in which a coefficient set including predetermined weighting coefficients and pixels contained in a resolution converted image are related to each other on the basis of a size of an input image and a size of a resolution converted image;
selecting a particular coefficient set to be applied for a calculation of a pixel value in the resolution converted image out of a plurality of coefficient sets on the basis of the generated table; and
calculating pixel values to be used in the resolution converted image resulting from the resolution conversion of the input image on the basis of the selected particular coefficient set and a plurality of pixel values contained in the input image, wherein
the table relates pixels contained in the resolution converted image to one coefficient set included in a coefficient set group,
the coefficient set group is composed of plural coefficient sets relating to various basic resolution conversions,
the table is composed of orthogonal tables in two directions, and a size of the table corresponds to a size of the resolution converted image, and
the orthogonal tables in two directions relate pixels identified by coordinate in the resolution converted image to the particular coefficient set to be used for calculating a pixel value of the pixel.
10. An image processing method, comprising:
generating a table in which a coefficient set including predetermined weighting coefficients and pixels contained in a resolution converted image are related to each other on the basis of a size of an input image and a size of a resolution converted image;
selecting a particular coefficient set to be applied for a calculation of a pixel value in the resolution converted image out of a plurality of coefficient sets on the basis of the generated table; and
calculating pixel values to be used in the resolution converted image resulting from the resolution conversion of the input image on the basis of the selected particular coefficient set and a plurality of pixel values contained in the input image, wherein
the table relates pixels contained in the resolution converted image to one coefficient set included in a coefficient set group,
the coefficient set group is composed of plural coefficient sets relating to various basic resolution conversions,
the table is composed of orthogonal tables in two directions, and a size of the table corresponds to a size of the resolution converted image, and
the orthogonal tables in two directions relate pixels identified by coordinate in the resolution converted image to the particular coefficient set to be used for calculating a pixel value of the pixel.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of forming a light emitting device comprising:
testing LED dies that emit light with a peak wavelength less than approximately 480 nm and determining light emission characteristics of the LED dies;
binning the LED dies in accordance with their light emission characteristics;
forming a variety of plates of a phosphor that emit at least orange-red or red light with a peak wavelength larger than 590 nm when energized by light from the LED dies, the plates being formed separate from the LED dies, the plates having different characteristics associated with different bins of LED dies;
matching a plate having a particular characteristic to a binned LED die to generate a white light having a target white point;
affixing a matched plate over an LED die to form a white light LED emitting orange-red or red, green or yellow-green, and blue light components, wherein a combination of the orange-red or red, green or yellow-green, and blue light components produces white light having the target white point; and
mounting at least one said white light LED in an illumination module for a pixelated light modulator, the modulator controlling at least red, green, and blue color subpixels, wherein the plates are matched to the binned LED dies to generate orange-red or red and blue light components whose peak wavelengths are within approximately 10% of the wavelengths corresponding to maximum light output requirements of the red and blue subpixels within a certain range of wavelengths.
2. A method of forming a light emitting device comprising:
testing LED dies that emit light with a peak wavelength less than approximately 480 nm and determining light emission characteristics of the LED dies;
binning the LED dies in accordance with their light emission characteristics;
forming a variety of plates of a phosphor that emit at least orange-red or red light with a peak wavelength larger than 590 nm when energized by light from the LED dies, the plates being formed separate from the LED dies, the plates having different characteristics associated with different bins of LED dies;
matching a plate having a particular characteristic to a binned LED die to generate a white light having a target white point; and
affixing a matched plate over an LED die to form a white light LED emitting orange-red or red, green or yellow-green, and blue light components, wherein a combination of the orange-red or red, green or yellow-green, and blue light components produces white light having the target white point,
wherein forming a variety of plates of a phosphor that emit at least orange-red or red light with a peak wavelength larger than 590 nm when energized by light from the LED dies comprises forming a variety of plates of a phosphor that emit at least orange-red or red light and green or yellow-green light when energized by light from the LED dies.
3. The method of claim 2 wherein the LED dies emit blue light.
4. The method of claim 2 wherein the LED dies emit UV light.
5. The method of claim 2 wherein binning the LED dies comprises separating the LED dies based on a peak wavelength output.
6. The method of claim 2 wherein forming a variety of plates of a phosphor that emit at least orange-red or red light when energized by light from the LED dies comprises forming a variety of plates of a phosphor that emit orange-red or red light, green or yellow-green light, and blue light when energized by light from the LED dies.
7. The method of claim 2 wherein forming the variety of plates of a phosphor comprises:
forming a substantially flat first phosphor plate emitting red light; and
forming a substantially flat second phosphor plate emitting green light.
8. The method of claim 7 wherein affixing a matched plate over an LED die comprises affixing the second phosphor plate over the first phosphor plate.
9. The method of claim 2 wherein forming the variety of plates of a phosphor that emit at least orange-red or red light comprises mixing green and red emission phosphors together to form a single plate of phosphor.
10. The method of claim 2 wherein the plates have a substantially rectangular prism shape.
11. The method of claim 2 wherein the matched plate has a bottom surface that extends over outer edges of the LED die.
12. The method of claim 2 wherein the matched plate has a bottom surface that does not extend over outer edges of the LED die.
13. The method of claim 2 wherein the matched plate is affixed over the LED die by a mechanical device.
14. The method of claim 2 wherein the target white point is a target white point associated with a bin of LEDs from which the white LED was made.
15. The method of claim 2 wherein the target white point is selected such that a liquid crystal display backlit using the white LED will output a desired color temperature.
16. A method of forming a light emitting device comprising:
testing LED dies that emit light with a peak wavelength less than approximately 480 nm and determining light emission characteristics of the LED dies;
binning the LED dies in accordance with their light emission characteristics;
forming a variety of plates of a phosphor that emit at least orange-red or red light with a peak wavelength larger than 590 nm when energized by light from the LED dies, the plates being formed separate from the LED dies, the plates having different characteristics associated with different bins of LED dies;
matching a plate having a particular characteristic to a binned LED die to generate a white light having a target white point; and
affixing a matched plate over an LED die to form a white light LED emitting orange-red or red, green or yellow-green, and blue light components, wherein a combination of the orange-red or red, green or yellow-green, and blue light components produces white light having the target white point,
wherein the matched plate is affixed to the LED die by an adhesive, and wherein the adhesive includes one of silicone and glass.
17. A method of forming a light emitting device comprising:
testing LED dies that emit light with a peak wavelength less than approximately 480 nm and determining light emission characteristics of the LED dies;
binning the LED dies in accordance with their light emission characteristics;
forming a variety of plates of a phosphor that emit at least orange-red or red light with a peak wavelength larger than 590 nm when energized by light from the LED dies, the plates being formed separate from the LED dies, the plates having different characteristics associated with different bins of LED dies;
matching a plate having a particular characteristic to a binned LED die to generate a white light having a target white point; and
affixing a matched plate over an LED die to form a white light LED emitting orange-red or red, green or yellow-green, and blue light components, wherein a combination of the orange-red or red, green or yellow-green, and blue light components produces white light having the target white point,
wherein forming the variety of plates of a phosphor that emit at least orange-red or red light comprises sintering phosphor grains under heat and pressure.
18. A method of forming a light emitting device comprising:
testing LED dies that emit light with a peak wavelength less than approximately 480 nm and determining light emission characteristics of the LED dies;
binning the LED dies in accordance with their light emission characteristics;
forming a variety of plates of a phosphor that emit at least orange-red or red light with a peak wavelength larger than 590 nm when energized by light from the LED dies, the plates being formed separate from the LED dies, the plates having different characteristics associated with different bins of LED dies;
matching a plate having a particular characteristic to a binned LED die to generate a white light having a target white point;
affixing a matched plate over an LED die to form a white light LED emitting orange-red or red, green or yellow-green, and blue light components, wherein a combination of the orange-red or red, green or yellow-green, and blue light components produces white light having the target white point;
providing the white light LED, along with a plurality of other white light LEDs substantially identical to the white light LED, in a backlight for a liquid crystal display (LCD),
operating the LCD to create images from red, green, and blue pixels; and
modulating a brightness of white light LEDs in the backlight such that a light output of some white light LEDs in the backlight box is different from a light output of other white light LEDs in the backlight.