Color Models and Illumination Changes

Color model representation allows characterizing in a quantitative manner, any defined color spectrum of visible light, i.e. with a wavelength between 400nm and 700nm. To accomplish that, each model, or color space, is associated with a function that allows mapping the spectral power distribution of the visible electromagnetic radiation, in a space defined by a set of discrete values that quantify the color components composing the model. Some color spaces are sensitive to changes in lighting conditions. Others assure the preservation of certain chromatic features, remaining immune to these changes. Therefore, it becomes necessary to identify the strengths and weaknesses of each model in order to justify the adoption of color spaces in image processing and analysis techniques. This chapter will address the topic of digital imaging, main standards and formats. Next we will set the mathematical model of the image acquisition sensor response, which enables assessment of the various color spaces, with the aim of determining their invariance to illumination changes.

A practical framework for the generation and selection of strategic plans of action, The relevance of timeframe considerations and a systems thinking approach

The paper proposes a methodology especially focused on the generation of strategic plans of action, emphasizing the relevance of having a structured timeframe classification for the actions. The methodology explicitly recognizes the relevance of long-term goals as strategic drivers, which must insure that the complex system is capable to effectively respond to changes in the environment. In addition, the methodology employs engineering systems techniques in order to understand the inner working of the system and to build up alternative plans of action. Due to these different aspects, the proposed approach features higher flexibility compared to traditional methods. The validity and effectiveness of the methodology has been demonstrated by analyzing an airline company composed by 5 subsystems with the aim of defining a plan of action for the next 5 years, which can either: improve efficiency, redefine mission or increase revenues.

Organizational and accounting change within the context of the environmental agenda: evidence from Portugal

Purpose – The purpose of this paper is to explore the process of organizational change undergone by a large Portuguese business group within the context of the environmental agenda and the role of accounting as a mechanism for change. Design/methodology/approach – The paper reports the results of a case study conducted between 2006 and 2009. Information was obtained from semi-structured interviews and secondary sources. Organizational changes were analyzed using Laughlin’s model in order to identify which category reflected most of the changes introduced to address environmental matters. Findings – This paper offers evidence that change is not a homogeneous phenomenon. Additionally, it confirms previous studies’ findings which found that accounting did not play a significant role in the process of organizational change within the context of the environmental agenda. Originality/value – This paper seeks to complement the research in this area by integrating observations from a case study into an existing model of levels of organizational change according to how a Portuguese business group incorporated environmental issues into its processes, policies and corporate culture.

Balanced scorecard no setor público: contributo do consultor de gestão

This article intends to understand the motivations, benefits and difficulties inherent to Balanced Scorecard (BSC) adoption in the public sector from the perspective of the professionals who implement it - the management consultants. We chose a qualitative research based on semi-structured interviews with management consultants belonging to consulting companies operating in Portugal, with experience in the implementation of the BSC in the public and private sector. The results allowed concluding that the use of management consultants is advantageous on the BSC adoption. To overcome the difficulties in construction and continuity of the BSC in the public sector, the consultants presented some facilitating conditions that can contribute to the increased efficacy in the adoption and continuation of BSC.

Balanced Scorecard no setor público: perspetiva do consultor de gestão

This article intends to understand the motivations, benefits and difficulties inherent to Balanced Scorecard (BSC) adoption in the public sector from the perspective of the professionals who implement it - the management consultants. We chose a qualitative research based on semi-structured interviews with management consultants belonging to consulting companies operating in Portugal, with experience in the implementation of the BSC in the public and private sector. The results allowed concluding that the use of management consultants is advantageous on the BSC adoption. To overcome the difficulties in construction and continuity of the BSC in the public sector, the consultants presented some facilitating conditions that can contribute to the increased efficacy in the adoption and continuation of BSC.