A Novel Artificial Mosaic Generation Technique Driven by Local Gradient Analysis

Abstract

Abstract. Art often provides valuable hints for technological innovations especially in the field of Image Processing and Computer Graphics. In this paper we present a novel method to generate an artificial mosaic starting from a raster input image. This approach, based on Gradient Vector Flow computation and some smart heuristics, permit us to follow the most important edges maintaining at the same time high frequency details. Several examples and comparisons with other recent mosaic generation approaches show the effectiveness of our technique.

A new method for creation of secret-fragment-visible-mosaic image for secure communication

“…Battiato et a1. [6], [7] uses gradient vector flow to follow the important edges to create ancient mosaic image and to maximize the covered mosaic area.…”

3D ancient mosaics

“…The overall system is realized in JAVA3D and allows to the user to properly set the values of the overall involved parameters of the respective algorithms ( [1,3,4,7]) including tile size and related shape. To achieve more realistic effects to the rendered mosaics, different random changes on tile color, position and tilt angle, have been considered to bring an impressive aesthetic impact.…”

“…In [3,4] the authors propose a novel approach based on Gradient Vector Flow (GVF) [10] computation together with some smart heuristics used to derive tiles positioning. Almost all previous approaches filter out high frequency details, in order to simplify some aspects of the mosaic generation.…”

“…In particular we have chosen to realize this experiment, starting from the two recent solutions presented in [1,3,4,7] that reproduces with different heuristics the well known techniques "Opus Musivum" and "Opus Vermiculatum". The 3D rendering, as better specified below allows to reach impressive results as demonstrated by the attached video.…”

An aesthetic mosaic image construction in a controllable manner

“…In the field of block-based mosaics, some classic mosaics are emulated. Their methods are attractive in that besides the color of blocks, edges of a target image are traced or enhanced in different way [10][11][12]17] and experimental results showed the soundness of their algorithm. These edge enhancing methods are instructive for our research.…”