Image display correcting system, image display correcting apparatus and method, and image display apparatus and method

An image display apparatus comprising:

• a cathode ray tube for displaying an image on the basis of inputted video signals for display;
• a correction data memory for storing correction data for correcting a display state of an image on a cathode ray tube, obtained based on an image displayed on a screen;
• calculating means for executing an operation of correcting image data by temporally and spatially changing the image data by pixel in one frame on the basis of the correction data stored in the correction data memory so that an image is properly displayed according to characteristics of the cathode ray tube and outputting the corrected image data for display on the cathode ray tube;
• and
• image display means for displaying an image on the basis of the image data for display outputted from the calculating means.

An image display apparatus comprising:

• an A/D converter for converting inputted analog component video signals of a plurality of colors into digital signals color by color and outputting the digital signals;
• a frame memory for storing the digital signals outputted from the A/D converter color by color on a frame unit basis;
• a correction write address generating unit for controlling an address position on the frame memory when the image data outputted from the A/D converter is stored into the frame memory;
• a timing generator for controlling the timing of the writing control executed by the correction write address generating unit;
• a read address generator for generating an address signal to read the data stored in the frame memory;
• a D/A converter for converting the digital signal for each color read from the frame memory into an analog signal and outputting the analog signal to a CRT;
• and
• a correction data memory for storing image distortion correcting data,
• wherein the correction write address generating unit controls an address position on the frame memory on the basis of the image distortion correcting data stored in the correction data memory so that image data supplied to the CRT is rearranged in each color and written, and the image data stored in the frame memory is sequentially read in accordance with an address signal generated by the read address generator, thereby an image which is not distorted is displayed.

An image display method comprising:

• a step of storing correction data for correcting a display state of an image on a cathode ray tube, obtained based on an image displayed on a screen of the cathode ray tube;
• a step of executing an operation of correcting image data by temporally and spatially changing the image data by pixel in one frame on the basis of the correction data stored in the storing step so that an image is properly displayed according to characteristics of the cathode ray tube and outputting the corrected image data as image data for display on the cathode ray tube;
• and
• a step of displaying an image on the cathode ray tube on the basis of the image data for display outputted in the calculating step.

An image display correcting system comprising:

• a cathode ray tube for displaying an image on the basis of inputted video signals for display and a correction data forming apparatus for forming correction data for correcting an image displayed on the cathode ray tube, wherein
• the correction data forming apparatus includes:
• an image pickup device for obtaining an image displayed on a screen of the cathode ray tube;
• and a correction data calculating unit for forming correction data to correct a display state of an image on the basis of the image obtained by the image pickup apparatus, and
• the cathode ray tube, includes:
• a correction data memory for storing correction data formed by the correction data forming apparatus;
• calculating means for executing an operation of correcting inputted image data by temporally and spatially changing the image data by pixel in one frame on the basis of the correction data stored in the correction data memory so that an image is properly displayed according to characteristics of the cathode ray tube and outputting the corrected image data as image data for display.

An image display correcting apparatus comprising:

• a correction data memory for storing correction data for correcting a display state of an image, obtained on the basis of an image displayed on a screen;
• and
• calculating means for performing an operation of correcting inputted image data on the basis of the correction data stored in the correction data memory so that an image is properly displayed and outputting the corrected image data as image data for display, wherein
• the correction data is data related to a movement amount from a proper display position of each pixel in two-dimensional digitized image data showing an image displayed on the screen,
• a value of each pixel in the corrected image data is calculated by using a value of a pixel in a position deviated only by the movement amount in the image data which has not been corrected, and
• the value of the pixel in a position deviated only by the movement amount is obtained by estimation of linear interpolation from four pixels existing near the position deviated only by the movement amount.

An image display correcting apparatus comprising:

• a correction data memory for storing correction data for correcting a display state of an image, obtained on the basis of an image displayed on a screen;
• and
• calculating means for performing an operation of correcting inputted image data on the basis of the correction data stored in the correction data memory so that an image is properly displayed and outputting the corrected image data as image data for display, wherein
• the correction data is data related to a movement amount from a proper display position of each pixel in two-dimensional digitized image data showing an image displayed on the screen,
• a value of each pixel in the corrected image data is calculated by using a value of a pixel in a position deviated only by the movement amount in the image data which has not been corrected,
• the movement amount is comprised of an integer part and a decimal fraction part,
• a plurality of pixels in uncorrected image data are selected on the basis of the integer part of the movement amount in order to calculate one pixel value in the corrected image data, and
• a calculation value to calculate the one pixel value for the selected pixels is determined on the basis of the decimal fraction part of the movement amount.

An image display correcting apparatus comprising:

• a correction data memory for storing correction data for correcting a display state of an image, obtained on the basis of an image displayed on a screen;
• and
• calculating means for performing an operation of correcting inputted image data on the basis of the correction data stored in the correction data memory so that an image is properly displayed and outputting the corrected image data as image data for display, wherein
• the correction data is data related to a movement amount from a proper display position in each of a plurality of representative pixels in digitized two-dimensional image data showing an image displayed on the screen,
• a pixel value of each of the representative pixels in the corrected image data is calculated by using a value of a pixel in a position deviated only by the movement amount from the representative pixel in the uncorrected image data,
• a pixel value of each of the other pixels than the representative pixels in the corrected image data is calculated by using a value of a pixel in a position deviated only by the movement amount from a proper display position obtained by estimation based on the movement amount of the representative pixel in the uncorrected image data,
• the movement amount of the representative pixel includes an integer part and a decimal fraction part,
• a plurality of pixels in uncorrected image data are selected on the basis of the integer part of the movement amount in order to calculate one of the representative pixels in the corrected image data, and
• a calculation value to calculate the one pixel value for the selected pixels is determined on the basis of the decimal fraction part of the movement amount.

An image display correcting apparatus comprising:

• a correction data memory for storing correction data for correcting a display state of an image, obtained on the basis of an image displayed on a screen;
• and
• calculating means for performing an operation of correcting inputted image data on the basis of the correction data stored in the correction data memory so that an image is properly displayed and outputting the corrected image data as image data for display, wherein
• the correction data is data related to a movement amount from a proper display position in each of a plurality of representative pixels in digitized two-dimensional image data showing an image displayed on the screen,
• a pixel value of each of the representative pixels in the corrected image data is calculated by using a value of a pixel in a position deviated only by the movement amount from the representative pixel in the uncorrected image data, and
• a pixel value of each of the other pixels than the representative pixels in the corrected image data is calculated by using a value of a pixel in a position deviated only by the movement amount from a proper display position obtained by estimation based on the movement amount of the representative pixel in the uncorrected image data,
• with respect to the movement amounts of the other pixels than the representative pixels, the movement amount of each of the pixels in a peripheral region of a screen is obtained by estimation of extrapolating the movement amounts of the representative pixels and the movement amount of each of the pixels in the region of the screen is obtained by estimation by interpolating the movement amounts of the representative pixels.

An image display apparatus comprising:

• an A/D converter for converting inputted analog component video signals of a plurality of colors into digital signals color by color and outputting the digital signals;
• a frame memory for storing the digital signals outputted from the A/D converter color by color on a frame unit basis;
• a correction write address generating unit for controlling an address position on the frame memory when the image data outputted from the A/D converter is stored into the frame memory;
• a timing generator for controlling the timing of the writing control executed by the correction write address generating unit;
• a read address generator for generating an address signal to read the data stored in the frame memory;
• a D/A converter for converting the digital signal for each color read from the frame memory into an analog signal and outputting the analog signal to a CRT;
• and
• a correction data memory for storing image distortion correcting data, wherein
• the correction write address generating unit controls an address position on the frame memory on the basis of the image distortion correcting data stored in the correction data memory so that image data supplied to the CRT is rearranged in each color and written, and the image data stored in the frame memory is sequentially read in accordance with an address signal generated by the read address generator, thereby an image which is not distorted is displayed.