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Visual Signal Processing: 2



  “Intuition tells us that the brain is complicated. We do
  complicated things, in immense variety. We breathe, cough,
  sneeze, vomit, mate, swallow, and urinate; we add and
  subtract, speak, and even argue, write, sing, and compose
  quartets, poems, novels, and plays; we play baseball and
  musical instruments. We perceive and think. How could the
  organ responsible for doing all that not be complex?”
                   Eye Brain and Vision : David Hubel
Visual Information Processing:
Touch : Mono frequency system




1. Modality
2. Location
3. Timing
4. Intensity
Hearing: Multi-frequency system
Bheraghat Jabalpur MP
Visual Signal Processing




         1. Modality - EM
         2. Location Form, shape, depth
         3. Timing - Motion
         4. Intensity -
Retina
Rods and Cones

                              Cones           Rods
                 Light        Low             High

                 Pigment      Less            More

                 Response     Fast            Slow

                 Use          Day

                 Loss         Blindness       Night Blindness

                 Acuity       High            Low

                 Saturation   Intense light   Day light

                 Color        Yes             No

                 Fovea        All             Absent

                 Population   Low             High
Phototransduction
                      Dark
              Light
Receptive Field
Receptive field
Receptive field: Lateral Inhibition
Receptive Field: Ganglion Cells




                      Stimulus    M Cells   P Cells
                      Color       No        Yes
                      Contrast    High      Low
                      Spatial     Low       High
                      Temporal    High      Low
Ganglion Cell : Contrast discrimination
04b visiual signal processing form shape
Lateral Geniculate Nucleus
Lateral Geniculate Ganglia
04b visiual signal processing form shape
Organization of Visual Cortex
04b visiual signal processing form shape
Visual Cortex Architecture
Visual Cortex Architecture
Recording from Visual Cortex
04b visiual signal processing form shape
Simple Cell
Complex Cells
Complex Cell
Complex Cells
Hypercomplex Cells
Significance of Movement Cells
Orientation Column
04b visiual signal processing form shape
Orientation column of visual cortex
Illusion of Edges: V2 in Monkey
Inferior Temporal neuron response to Form
04b visiual signal processing form shape
Face and Complex Form Recognition ITC
04b visiual signal processing form shape
Blobs




 40μm thick layer of upper cortex that has been processed
 histochemically to reveal the density of cytochrome oxidase, a
 mitochondrial enzyme involved in energy production
Ocular dominance column
04b visiual signal processing form shape
Visual Cortex Architecture
Motion in the visual field
04b visiual signal processing form shape
PET scan of MT area for Motion Processing
Depth of vision
Neuronal basis of stereoscopic vision
AIT = anterior inferior temporal area; CIT = central inferior temporal area; LIP = lateral
intraparietal area; Magno = magnocellular layers of the lateral geniculate nucleus; MST =
medial superior temporal area; MT = middle temporal area; Parvo = parvocellular layers of the
lateral geniculate nucleus; PIT = posterior inferior temporal area; VIP = ventral intraparietal
area.) (Based on Merigan and Maunsell 1993.)
04b visiual signal processing form shape

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04b visiual signal processing form shape