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From: | anonymous |
Subject: | [Octave-bug-tracker] [bug #56796] imtransform changes the contrast of image when using bilinear interpolation |
Date: | Thu, 22 Aug 2019 19:09:56 -0400 (EDT) |
User-agent: | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36 |
URL: <https://savannah.gnu.org/bugs/?56796> Summary: imtransform changes the contrast of image when using bilinear interpolation Project: GNU Octave Submitted by: None Submitted on: Thu 22 Aug 2019 11:09:55 PM UTC Category: Octave Function Severity: 3 - Normal Priority: 5 - Normal Item Group: Incorrect Result Status: None Assigned to: None Originator Name: Originator Email: Open/Closed: Open Discussion Lock: Any Release: 5.1.0 Operating System: Microsoft Windows _______________________________________________________ Details: When transforming images with "imtransform" I noticed that the result with bilinear interpolation did not give the expected result, but a brighter image. The attached image shows the transformed image with interpolation set to: a) nearest neighbor ('nearest') b) bilinear (default) c) my own implementation of bilinear d) bicubic The interpolation option was the only parameter varied, and Octave's bilinear result seems wrong. _______________________________________________________ File Attachments: ------------------------------------------------------- Date: Thu 22 Aug 2019 11:09:55 PM UTC Name: interpolation.jpg Size: 57KiB By: None <http://savannah.gnu.org/bugs/download.php?file_id=47384> _______________________________________________________ Reply to this item at: <https://savannah.gnu.org/bugs/?56796> _______________________________________________ Message sent via Savannah https://savannah.gnu.org/
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