Canon Kabushiki Kaisha

Hewlett-Packard Company

Tong Zheng

Jun Zhao

Jonathan Hui

Andrew E Fitzhugh

Michael Strittmatter

In a method for determining a data value for a target pixel in a destination image based on data values for pixels in a source image, with the destination image being scaled relative to the source image, calculating a position in the source image based on position of a target pixel in the destination image, testing the presence of a diagonal gradient in the source image at the position determined in the calculating step, the testing step testing for the presence of a diagonal gradient by reference to values of pixels in the source image that surround the position calculated in the calculating step, responsive to the presence of a diagonal gradient in the testing step, calculating a data value for the target pixel based on interpolation of data values for diagonally-adjacent pixels in the source image, and responsive to the absence of a diagonal gradient in the testing step, calculating a data value for the target pixel based on interpolation of data values for at least all four surrounding pixels in the source image.

Gradient-based pixel interpolation

The present invention provides a method and apparatus for visually presenting the access frequency of a two dimensional image. The method includes the steps of: determining which defined regions of the image are accessed; determining the frequency that the plurality of defined regions is accessed; creating a graphical representation corresponding to the plurality of defined regions for the image, wherein the x axis of the graphical representation corresponds to the x axis of the image and the y axis of the graphical representation corresponds to the y axis of the image; and combining the graphical representation with an access frequency indicator to create an access frequency output that corresponds to the plurality of defined regions. From the access frequency output, the user can see the access patterns of the image and can easily visualize how frequently small portions of the image are accessed.

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Mountain View, CA, United States of America

Tong Zheng