framebuffer compression for video processing devices
U.S. Patent No. 8.559,499B2
S. Mallat + C. Bernard
October 2013

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framebuffer compression for video processing devices
U.S. Patent No. 8.559,499B2
S. Mallat + C. Bernard
October 2013
Photoreceptors are not distributed evenly on the retina. Our visual acuity is greatest at the centre of the retina: the fovea. The fovea is responsible for high acuity tasks such as reading or recognition. A retina with a uniform resolution equal to the highest fovea resolution would require 10,000 times more photoreceptors. That would require a much larger optic nerve and much larger visual cortex. Saccades move successively the fovea over regions of a scene with high information content. These saccades are partly guided by the lower resolution information gathered at the periphery of the retina. Our multiresolution sensor, the eye, provides high resolution information at selected locations, and a large field of view, with relatively little data.
Stéphane Mallat, Wavelet Tour of Signal Processing
Android - Multiscreen và ý nghĩa của dp
Giả sử: Có 1 imageview (scaleType là center) trong đó đặt 1 ảnh cố định, giở muốn 1 view khác to = 1/2 view này thì làm thế nào?
Vì ảnh cố định nên biết trước được px tương ứng với từng folder hdpi, xhdpi,... Nếu ảnh trong folder này được designer cắt "chuẩn" thì sẽ có số dp là bằng nhau cho dù số px khác nhau.
Vậy, chỉ cần convert ảnh từ px sang dp rồi cho view kia có width height = 1/2 là đc.
Tool để convert từ px sang dp:
http://pixplicity.com/dp-px-converter