Final answer:
Observing the image longer will not significantly improve image recognition by the eye due to its short integration time, while brightening up the image and increasing technical factors can enhance visual perception.
Step-by-step explanation:
The question asks about factors that will not improve image recognition by the eye. Given the provided information, we can infer that one factor, which is 'observing the image longer', will not significantly improve image recognition by the eye. This is due to the eye's short integration time, which means it takes only a brief moment to add light energy together before sending the image to the brain. Unlike modern detectors that can take long exposures to detect faint objects in the cosmos, the human eye cannot integrate light over extended periods in the same way.
Increasing the brightness of an image and increasing technical factors can improve image recognition. Brightening up an image makes it easier for the eye to detect contrasts and details, while technical factors could refer to improving lens quality or using techniques to enhance contrast with interference effects, as highlighted in the context of microscopes.