Camera blemish defects detection
AssigneeApple Inc.
InventorsHongqin Zhang, Shizhe Shen, Iain A. McAllister
Life of this patent
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Abstract
A digital image captured by a digital camera module is scaled to a smaller size, and separately horizontal direction filtered and vertical direction filtered using one-dimensional spatial filters. The horizontal direction filtered image and the vertical direction filtered image are combined, wherein edge regions and corner regions of the combined filtered image are created differently than its middle region. The combined filtered image is then thresholded selected pixels of the thresholded image are marked as a blemish region. Other embodiments are also described and claimed.
Claims13
A method for testing a digital camera module, comprising:
- scaling a digital image captured by the digital camera module to a smaller size;
- horizontal direction filtering the scaled image by applying, row by row, a horizontally oriented one-dimensional spatial filter to each pixel of the scaled image;
- vertical direction filtering the scaled image by applying, column by column, a vertically oriented one-dimensional spatial filter to each pixel of the scaled image;
- combining the horizontal direction filtered image and the vertical direction filtered image, wherein edge regions and corner regions of the combined filtered image are created differently than its middle region;
- thresholding the combined filtered image;
- and
- marking a selected plurality of pixels of the thresholded image as a blemish region.
A system for testing a camera module, comprising:
- a scaler unit to receive a digital image captured by a camera module and spatially scale the digital image to a lower resolution;
- a horizontal direction filter through which one instance of the scaled digital image is to pass;
- a vertical direction filter through which the scaled digital image is to pass;
- a combiner to combine an output image of the horizontal direction filter with an output image of the vertical direction filter, into a combined image having about the same resolution as each of the output images;
- and
- a discriminator unit to classify selected ones of the pixels in the combined image as a blemish region.
A method for testing a digital camera device under test (camera DUT), comprising:
- scaling the digital image to a smaller size;
- spatially filtering the scaled image by applying a one-dimensional horizontal filter each pixel of the scaled image row by row;
- spatially filtering the scaled image by applying a one-dimensional vertical filter to each pixel of the scaled image column by column;
- combining the horizontal spatially filtered image and the vertical spatially filtered images, wherein edge regions and corner regions of the combined filtered image are created differently than its middle region;
- and
- thresholding the combined filtered image to reveal a plurality of pixels of the thresholded image as a blemish region.
Dependencies are inferred from the claim text.