The invention relates to image focus. In particular, it relates to a focus assist system that conveys focus level data to a user. There are a wide variety of different display methods, including, but not limited to, graphs, highlights, symbols, and varied levels of brightness or color.
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What is claimed is: 1. A method of providing an indication of a degree of focus, comprising: detecting an image using a two-dimensional array of optical sensors; converting the detected image signals into a data structure that represents the detected image as a two-dimensional array of pixel values
What is claimed is: 1. A method of providing an indication of a degree of focus, comprising: detecting an image using a two-dimensional array of optical sensors; converting the detected image signals into a data structure that represents the detected image as a two-dimensional array of pixel values, where the pixel values are representative of an amount of light detected by the optical sensors; generating a blurred image by combining a selected pixel value with a plurality of pixel values from the vicinity of the selected pixel value; comparing the selected pixel value with a corresponding blurred image pixel value to determine a degree of focus; and providing a visual indication of the degree of focus. 2. The method of claim 1, wherein the visual indication of the degree of focus is overlaid on a representation of the detected image. 3. The method of claim 1, wherein the visual indication of the degree of focus is adjacent to a representation of the detected image. 4. The method of claim 1, wherein providing the visual indication of the degree of focus comprises displaying a waveform corresponding to the degree of focus. 5. The method of claim 4, wherein a point on the waveform corresponds to an average degree of focus for a plurality of vertically aligned pixels. 6. The method of claim 4, wherein a point on the waveform corresponds to an average degree of focus for a plurality of horizontally aligned pixels. 7. The method of claim 4, wherein a point on the waveform corresponds to an average degree of focus for a plurality of pixels in a block. 8. The method of claim 4, wherein a point on the waveform corresponds to an average degree of focus for a plurality of non-adjacent pixels. 9. The method of claim 1, further comprising determining a degree of focus for a plurality of selected pixels. 10. The method of claim 9, wherein said plurality of selected pixels define a scan line and wherein providing the visual indication of the degree of focus comprises displaying a waveform corresponding to the degree of focus. 11. The method of claim 10, wherein a position of said scan line is selected by a user. 12. The method of claim 10, wherein said scan line comprises a horizontal line. 13. The method of claim 10, wherein said scan line comprises a vertical line. 14. The method of claim 10, wherein said scan line comprises a line running at a slope. 15. The method of claim 10, wherein said scan line comprises a plurality of scan lines. 16. The method of claim 15, wherein said plurality of scan lines comprises at least one vertical line and at least one horizontal line. 17. The method of claim 15, wherein said waveform comprises information relating to an average of data from said plurality of scan lines. 18. The method of claim 15, wherein said waveform comprises a plurality of waveforms, each of said plurality of waveforms corresponding to at least one of said plurality of scan lines. 19. The method of claim 10, wherein said scan line is greater than a pixel in width. 20. The method of claim 10, wherein a width of the scan line is selected by a user. 21. The method of claim 10, wherein said waveform is updated in real-time. 22. The method of claim 1, wherein providing a visual indication of the degree of focus comprises eliminating noise from said visual indication. 23. An apparatus that assists in adjusting a focus of an image, comprising: a lens having variable focal length, said lens producing a visual data image from light that enters the lens; a two-dimensional array of optical sensors that converts the visual data image from the lens into a two-dimensional, digital array of pixel values, where the pixel values are representative of an amount of light detected by the optical sensors; a processor configured to generate a blurred image by combining a selected pixel value with a plurality of pixel values from the vicinity of the selected pixel value and further configured to compare the selected pixel value with a corresponding blurred image pixel value to determine a degree of focus; and a display, wherein the display shows the visual data image from the lens and a visual indication of the degree of focus, superimposed on the visual data image and updated contemporaneously with the visual data image. 24. The apparatus of claim 23, wherein the apparatus is incorporated into a motion picture camera. 25. The apparatus of claim 23, wherein the visual indication comprises a waveform. 26. The apparatus of claim 23, wherein the waveform has variable color, with the color variations being indicative of focus level data. 27. The apparatus of claim 23, wherein the waveform has variable intensity, with the intensity variations being indicative of focus level data. 28. The apparatus of claim 23, wherein the waveform has variable density, with the density variations being indicative of focus level data. 29. The apparatus of claim 23, wherein the waveform has variable amplitude, with variations in amplitude being indicative of focus level data.
Krueger Roland (Wolfenbuettel DEX) Proske Joachim (Brunswick DEX) Rsner Ortwin (Munich DEX) Swarofsky Walter (Brunswick DEX), Camera having depth of focus indicating means.
Moberg Gregory O. (Rochester NY) Rhodes Wilfred D. (W. Webster NY) Surdyke Keith R. (Bergen all of NY), Columnar focusing indicator for a manually focused video camera.
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