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app.py — Interface Streamlit do sistema forense de deteção de deepfakes.
Responsabilidades deste ficheiro:
- Carregar modelos (SwinV2, CLIP DF-40) via cache
- Gerir a UI (upload, sliders, botões, visualizações)
- Orquestrar o pipeline de inferência chamando funções dos módulos especializados
NÃO duplica lógica de:
explainability.py → generate_heatmap, get_region_masks, score_regions_manipulation,
get_landmarker (singleton FaceLandmarker), build_face_mask
artifact_zones.py → extract_artifact_zones, segment_zones_with_probability
interacao_LVM.py → ForensicVLMOrchestrator
models/models.py → SwinV2Classifier, DF40CLIPModel, transforms
config.py → FUSION_WEIGHTS, ROOT_DIR, DEVICE
"""
import base64
import concurrent.futures
import json
import warnings
import gc
from io import BytesIO
import cv2
import mediapipe as mp # apenas para mp.Image / mp.ImageFormat
import numpy as np
import streamlit as st
import streamlit.components.v1 as components
import torch
import transformers
from huggingface_hub import hf_hub_download
from PIL import Image
# ── Módulos do projecto ────────────────────────────────────────────────
from artifact_zones import extract_artifact_zones, segment_zones_with_probability
from config import DEVICE, FUSION_WEIGHTS, ROOT_DIR
from explainability import (
generate_heatmap,
get_landmarker, # singleton reutilizado aqui e no explainability.py
get_region_masks,
score_regions_manipulation,
)
from models.models import DF40CLIPModel, SwinV2Classifier, get_clip_transform, get_swinv2_transform
from scripts.interacao_LVM import ForensicVLMOrchestrator
warnings.filterwarnings("ignore", category=UserWarning, message=".*sm_120.*")
transformers.logging.set_verbosity_error()
PADDING_FACE = 0.45
st.set_page_config(
page_title="Segurança Visual", layout="wide", initial_sidebar_state="expanded"
)
# ══════════════════════════════════════════════════════════════════════
# CACHE DE RECURSOS — carregados uma única vez por sessão
# ══════════════════════════════════════════════════════════════════════
@st.cache_resource
def get_all_models():
"""Carrega SwinV2 e CLIP DF-40 a partir do HuggingFace Hub (cache local)."""
# SwinV2
swin_path = hf_hub_download(repo_id="liamu/Deepfake-Pesos", filename="model.safetensors")
swin = SwinV2Classifier(ckpt_path=swin_path).to("cpu").eval()
# CLIP DF-40 — higienização do state_dict para remover prefixos de DataParallel
clip_path = hf_hub_download(repo_id="liamu/Deepfake-Pesos", filename="clip_large.pth")
state = torch.load(clip_path, map_location="cpu")
cleaned = {}
for k, v in state.items():
nk = k.replace("module.", "") if k.startswith("module.") else k
if nk.startswith("backbone.") and not nk.startswith("backbone.vision_model."):
nk = nk.replace("backbone.", "backbone.vision_model.", 1)
cleaned[nk] = v
clip = DF40CLIPModel(num_labels=2).to("cpu")
clip.load_state_dict(cleaned)
clip.eval()
return swin, clip
@st.cache_resource
def load_fusion_weights():
"""Lê o JSON de pesos da Regressão Logística uma única vez."""
try:
with open(FUSION_WEIGHTS) as f:
cfg = json.load(f)
return (
float(cfg.get("weight_swin", 1.0)),
float(cfg.get("weight_df40", 1.0)),
float(cfg.get("weight_z", 1.0)),
float(cfg.get("bias", 0.0)),
float(cfg.get("threshold_optimal", 0.6877)),
)
except Exception:
return 1.0, 1.0, 1.0, 0.0, 0.6877
@st.cache_resource
def get_transforms():
"""Cria os transforms de pré-processamento uma única vez."""
return get_swinv2_transform(), get_clip_transform()
# ══════════════════════════════════════════════════════════════════════
# DETEÇÃO FACIAL — reutiliza o singleton get_landmarker() do explainability.py
# ══════════════════════════════════════════════════════════════════════
def extract_main_face(img_bgr, padding_ratio=PADDING_FACE):
"""
Recorta a face dominante com padding adaptativo.
Usa o FaceLandmarker (MediaPipe Tasks) já instanciado em explainability.py.
"""
img_rgb = cv2.cvtColor(img_bgr, cv2.COLOR_BGR2RGB)
h, w = img_bgr.shape[:2]
try:
mp_image = mp.Image(image_format=mp.ImageFormat.SRGB, data=img_rgb)
result = get_landmarker().detect(mp_image)
except Exception as e:
return None, f"Erro na deteção facial: {e}"
if not result.face_landmarks:
return None, "Nenhuma face detetada. Submeta um retrato mais claro."
lm = result.face_landmarks[0]
xs = [int(p.x * w) for p in lm]
ys = [int(p.y * h) for p in lm]
x_min, x_max = min(xs), max(xs)
y_min, y_max = min(ys), max(ys)
pad_h = int((y_max - y_min) * padding_ratio)
pad_w = int((x_max - x_min) * padding_ratio)
y1 = max(0, y_min - pad_h); y2 = min(h, y_max + pad_h)
x1 = max(0, x_min - pad_w); x2 = min(w, x_max + pad_w)
return img_bgr[y1:y2, x1:x2], "OK"
# ══════════════════════════════════════════════════════════════════════
# FUNÇÕES DE RENDERIZAÇÃO UI (específicas do Streamlit — não duplicar noutros módulos)
# ══════════════════════════════════════════════════════════════════════
def inject_custom_css():
st.markdown("""
<style>
div.stButton > button:first-child {
background-color: #2563eb; color: white; border-radius: 6px;
font-weight: bold; border: none; padding: 0.5rem 1rem; transition: all 0.3s ease;
}
div.stButton > button:first-child:hover {
background-color: #1d4ed8; box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
div[data-testid="stExpander"] { border: 1px solid #334155; border-radius: 8px; background-color: #0f172a; }
.block-container { padding-top: 2rem; padding-bottom: 2rem; }
</style>
""", unsafe_allow_html=True)
def render_confidence_bar(prob_fake, threshold):
is_fake = prob_fake > threshold
confianca = prob_fake if is_fake else (1.0 - prob_fake)
color = "#ef4444" if is_fake else "#22c55e"
label = "FALSA" if is_fake else "REAL"
st.markdown(f"""
<div style="margin-bottom:1rem;">
<div style="display:flex;justify-content:space-between;margin-bottom:.25rem;">
<span style="font-weight:bold;font-size:1.1rem;color:{color};">🎯 {label}</span>
<span style="font-weight:bold;">{confianca*100:.1f}%</span>
</div>
<div style="width:100%;background-color:#334155;border-radius:4px;height:12px;overflow:hidden;">
<div style="width:{confianca*100}%;background-color:{color};height:100%;transition:width 0.5s ease;"></div>
</div>
</div>""", unsafe_allow_html=True)
def visualize_heatmap(heatmap_array, colormap=cv2.COLORMAP_JET):
hm = cv2.applyColorMap((heatmap_array * 255).astype(np.uint8), colormap)
return Image.fromarray(cv2.cvtColor(hm, cv2.COLOR_BGR2RGB))
def render_heat_card(img_pil, title, subtitle, color):
buff = BytesIO()
img_pil.save(buff, format="PNG")
b64 = base64.b64encode(buff.getvalue()).decode("utf-8")
return f"""
<div style="display:flex;flex-direction:column;align-items:center;width:100%;">
<img src="data:image/png;base64,{b64}" style="width:100%;border-radius:6px;box-shadow:0 4px 6px rgba(0,0,0,.3);">
<p style="text-align:center;color:{color};font-size:14px;margin-top:12px;line-height:1.4;">
{title}<br><b>{subtitle}</b>
</p>
</div>"""
def render_interactive_polygons(img_pil, zones, prob_masks):
buff = BytesIO()
img_pil.save(buff, format="JPEG")
img_b64 = base64.b64encode(buff.getvalue()).decode("utf-8")
width, height = img_pil.size
def san(name):
return name.lower().replace(" ", "-").replace("/", "-")
svg_polygons = ""
menu_items = ""
valid_zones = []
for zone in zones:
z_name = zone.name.lower()
mask = prob_masks.get(z_name)
if mask is None or not mask.any():
continue
valid_zones.append(z_name)
zc = san(z_name)
# ── Redimensionar máscara de 512×512 para o espaço da imagem exibida ──
mask_u8 = cv2.resize(
mask.astype(np.uint8) * 255,
(width, height), # dimensões reais da imagem no SVG
interpolation=cv2.INTER_NEAREST
)
cnts, _ = cv2.findContours(mask_u8, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
for cnt in cnts:
approx = cv2.approxPolyDP(cnt, 0.002 * cv2.arcLength(cnt, True), True)
pts = " ".join(f"{pt[0][0]},{pt[0][1]}" for pt in approx)
svg_polygons += f'<polygon class="poly-{zc}" points="{pts}" style="fill:rgba(239,68,68,.15);stroke:rgba(255,255,255,.2);stroke-width:1;transition:all .3s ease;pointer-events:none;"></polygon>'
for name in sorted(set(valid_zones)):
zc = san(name)
hi = f"document.querySelectorAll('.poly-{zc}').forEach(p=>{{p.style.fill='rgba(239,68,68,.7)';p.style.stroke='rgba(255,255,255,1)';p.style.strokeWidth='3';}});this.style.backgroundColor='#3b82f6';this.style.color='white';"
ho = f"document.querySelectorAll('.poly-{zc}').forEach(p=>{{p.style.fill='rgba(239,68,68,.15)';p.style.stroke='rgba(255,255,255,.2)';p.style.strokeWidth='1';}});this.style.backgroundColor='#1e293b';this.style.color='#cbd5e1';"
menu_items += f'<div onmouseover="{hi}" onmouseout="{ho}" style="padding:10px 15px;background-color:#1e293b;color:#cbd5e1;border-radius:6px;cursor:pointer;font-size:13px;font-weight:bold;transition:all .2s ease;border:1px solid #334155;text-transform:uppercase;">{name}</div>'
components.html(f"""<!DOCTYPE html><html><head><style>body{{margin:0;padding:0;background:transparent;font-family:sans-serif;}}</style></head><body>
<div style="display:flex;gap:20px;width:100%;align-items:start;">
<div style="flex:0 0 180px;display:flex;flex-direction:column;gap:8px;">
<p style="margin:0 0 5px 0;color:#94a3b8;font-size:12px;font-weight:bold;text-transform:uppercase;">Anatomia Afetada</p>
{menu_items}
</div>
<div style="flex:1;position:relative;display:flex;justify-content:center;">
<svg viewBox="0 0 {width} {height}" style="width:100%;max-width:512px;height:auto;max-height:550px;border-radius:8px;box-shadow:0 4px 6px rgba(0,0,0,.3);display:block;" xmlns="http://www.w3.org/2000/svg">
<image href="data:image/jpeg;base64,{img_b64}" width="{width}" height="{height}"/>
{svg_polygons}
</svg>
</div>
</div></body></html>""", height=500)
# ══════════════════════════════════════════════════════════════════════
# MAIN
# ══════════════════════════════════════════════════════════════════════
def main():
inject_custom_css()
# Carregar todos os recursos em cache
swin, clip_df40 = get_all_models()
w_swin, w_df40, w_z, bias, threshold_default = load_fusion_weights()
swin_tf, clip_tf = get_transforms()
st.markdown(
'<p style="font-size: 60px; font-weight: bold; color: #bdbbbb; text-align: center; margin-bottom: 10px;"> 🔍 Deepfake Face Detector </p>',
unsafe_allow_html=True)
st.markdown("<p style='text-align:center;color:#94a3b8;font-size:16px;margin-bottom:2rem;'>Deteção de criação sintética e manipulação em rostos humanos.</p>", unsafe_allow_html=True)
with st.expander("Como funciona a plataforma", expanded=False):
st.markdown("""
O sistema analisa a imagem em três fases para determinar se foi gerada ou manipulada por Inteligência Artificial:
1. **Análise de Superfície:** Procura artefactos microscópicos e falhas de textura invisíveis ao olho humano.
2. **Coerência Biométrica:** Verifica se os traços faciais e a iluminação são consistentes, detetando trocas de rosto, edições.
3. **Localização de Anomalias:** Isola e mapeia graficamente as áreas específicas onde a manipulação ocorreu.
<div style='margin-top:20px;'>
<p style='font-size:12px;font-family:monospace;background-color:#0f172a;padding:10px;border-radius:4px;color:#cbd5e1;'>
<strong>INPUT:</strong> Imagem RGB da cara (A cores) <br>
<strong>OUTPUT:</strong> Classificação → Explicação Visual (Explicador e Segmentador) → Relatório do Gemini
</p>
</div>
""", unsafe_allow_html=True)
# ── Sidebar ──────────────────────────────────────────────────────
st.sidebar.markdown("### ⚙️ Configuração da Análise")
opcoes_input = ["Sua Imagem", "Exemplo Falso", "Exemplo Real"]
escolha_input = st.sidebar.selectbox("Fonte da imagem:", opcoes_input)
threshold = st.sidebar.slider("Rigor da Deteção", 0.10, 0.95, float(threshold_default), 0.01)
st.sidebar.markdown("---")
st.sidebar.markdown("""
<div style='background-color:#0f172a;padding:15px;border-radius:8px;border-left:4px solid #3b82f6;font-size:14px;line-height:1.4;'>
<p style='margin-top:0; margin-bottom:12px; font-weight:bold; color:#e2e8f0; font-size:15px;'>
Em que consiste a APP
</p>
<p style='margin-bottom:4px; color:#94a3b8; font-size:12px; text-transform:uppercase; font-weight:bold;'>
1. Deteção
</p>
<p style='margin-bottom:12px; font-weight:bold; color:#f8fafc; font-size:13px;'>
SwinV2 & CLIP DF-40<br>
<span style='font-weight:normal; color:#cbd5e1; font-size:12px;'>
Analisam texturas microscópicas e traços faciais para calcular a probabilidade de a imagem ser falsa.
</span>
</p>
<p style='margin-bottom:4px; color:#94a3b8; font-size:12px; text-transform:uppercase; font-weight:bold;'>
2. Mapeamento
</p>
<p style='margin-bottom:12px; font-weight:bold; color:#f8fafc; font-size:13px;'>
CLIP Surgery & BiSeNet<br>
<span style='font-weight:normal; color:#cbd5e1; font-size:12px;'>
Funcionam como um raio-X, isolando e destacando as zonas exatas do rosto que sofreram manipulação.
</span>
</p>
<p style='margin-bottom:4px; color:#94a3b8; font-size:12px; text-transform:uppercase; font-weight:bold;'>
3. Relatório
</p>
<p style='margin-bottom:0; font-weight:bold; color:#f8fafc; font-size:13px;'>
Gemini (Google)<br>
<span style='font-weight:normal; color:#cbd5e1; font-size:12px;'>
Lê as anomalias detetadas nos passos anteriores e gera uma explicação consoante seja falsa ou real.
</span>
</p>
</div>
""", unsafe_allow_html=True)
col_input, col_result = st.columns([1, 1.2], gap="large")
img_bgr = None
raw_img_bgr = None
# ── Coluna de Input ───────────────────────────────────────────────
with col_input:
st.markdown("#### Origem da Imagem")
if escolha_input == "Sua Imagem":
up = st.file_uploader("Arraste o ficheiro", type=["jpg", "png", "jpeg"],
label_visibility="collapsed")
if up:
raw_img_bgr = cv2.imdecode(np.frombuffer(up.read(), np.uint8), cv2.IMREAD_COLOR)
else:
nome_base = "false" if "Falso" in escolha_input else "real"
for ext in [".png", ".jpg", ".jpeg"]:
p = ROOT_DIR / "exemplos" / f"{nome_base}{ext}"
if p.exists():
raw_img_bgr = cv2.imread(str(p))
break
analisar = False
if raw_img_bgr is not None:
with st.spinner("A detetar rosto na imagem..."):
cropped, status = extract_main_face(raw_img_bgr)
if cropped is None:
st.error(status)
else:
img_bgr = cropped
st.image(cv2.cvtColor(img_bgr, cv2.COLOR_BGR2RGB),
caption="Área de análise isolada", width=350)
label_btn = "Verificar Autenticidade" if escolha_input == "Sua Imagem" \
else f"Analisar Exemplo ({nome_base.upper()})"
analisar = st.button(label_btn, use_container_width=True)
# ── Coluna de Resultados ─────────────────────────────────────────
with col_result:
st.markdown("#### 📝 Resultados da Análise")
if analisar and img_bgr is not None:
# Limpar estado de análise anterior
for key in ["contrastive_hm", "per_text_hm", "prompt_list", "reg_scores"]:
st.session_state.pop(key, None)
img_rgb = cv2.cvtColor(img_bgr, cv2.COLOR_BGR2RGB)
img_hires = cv2.resize(img_rgb, (512, 512))
img_pil = Image.fromarray(img_rgb)
raw_rgb = cv2.cvtColor(raw_img_bgr, cv2.COLOR_BGR2RGB)
raw_pil = Image.fromarray(raw_rgb)
# Preparar tensores
t_swin = swin_tf(raw_pil).unsqueeze(0).to("cpu")
t_clip = (clip_tf(img_pil).unsqueeze(0).to("cpu")
.type(next(clip_df40.parameters()).dtype))
# Inferência paralela dos três especialistas
with st.spinner("A verificar autenticidade..."):
with concurrent.futures.ThreadPoolExecutor(max_workers=3) as ex:
f_swin = ex.submit(lambda t: float(torch.softmax(swin(t), dim=1)[0, 1].item()), t_swin)
f_clip = ex.submit(lambda t: float(torch.softmax(clip_df40(t), dim=1)[0, 1].item()), t_clip)
f_surgery = ex.submit(generate_heatmap, img_hires)
prob_swin = f_swin.result()
prob_clip_df40 = f_clip.result()
contrastive_hm, per_text_hm, scores, prompts, _ = f_surgery.result()
# Z-score espacial
masks = get_region_masks(img_hires) # # 512×512 — mesma resolução do heatmap
contrast_map = np.clip(
per_text_hm.get("AI face manipulation", np.zeros((512, 512))) -
per_text_hm.get("real human face", np.zeros((512, 512))),
0, 1
)
reg_scores = score_regions_manipulation(img_hires, contrast_map, masks, scores)
contrasts = [d["contrast"] for d in reg_scores.values()]
z_anomaly = ((max(contrasts) - np.mean(contrasts)) / (np.std(contrasts) + 1e-6)
if len(contrasts) > 1 else 0.0)
# Fusão LR + High-Confidence Override
logit = prob_swin * w_swin + prob_clip_df40 * w_df40 + z_anomaly * w_z + bias
prob_final = float(1.0 / (1.0 + np.exp(-logit)))
if max(prob_swin, prob_clip_df40) > 0.85:
prob_final = max(prob_final, max(prob_swin, prob_clip_df40))
is_fake = prob_final > threshold
# Guardar no session_state para o painel técnico
st.session_state.update({
"contrastive_hm": contrastive_hm,
"per_text_hm": per_text_hm,
"prompt_list": prompts,
"reg_scores": reg_scores,
})
render_confidence_bar(prob_final, threshold)
if is_fake:
zones = extract_artifact_zones(img_hires, contrastive_hm, masks, reg_scores)
if zones:
prob_masks = segment_zones_with_probability(contrastive_hm, zones, prob_threshold=0.40)
render_interactive_polygons(Image.fromarray(img_rgb), zones, prob_masks)
else:
st.image(img_rgb, width=250, caption="Nenhuma anomalia detetada.")
# ── Relatório ────────────────────────
if analisar and img_bgr is not None and "is_fake" in dir() and not is_fake:
st.markdown("<hr style='border:1px solid #334155;margin:2rem 0;'>",
unsafe_allow_html=True)
st.markdown("### 📋 Relatório")
with st.spinner("A gerar relatório ..."):
orchestrator = ForensicVLMOrchestrator(mode="api")
stream = orchestrator.generate_real_justification(img_rgb, prob_final)
ESTILO_REAL = ("background-color:#0f172a;padding:25px;border-radius:8px;"
"border-left:4px solid #22c55e;font-size:15px;color:#f8fafc;"
"line-height:1.7;box-shadow:0 4px 6px rgba(0,0,0,.2);margin-bottom:2rem;")
box_real = st.empty()
if isinstance(stream, str):
box_real.markdown(f"<div style='{ESTILO_REAL}'>{stream}</div>", unsafe_allow_html=True)
else:
acumulado = ""
for chunk in stream:
if chunk:
acumulado += chunk
box_real.markdown(f"<div style='{ESTILO_REAL}'>{acumulado} ▌</div>",
unsafe_allow_html=True)
box_real.markdown(f"<div style='{ESTILO_REAL}'>{acumulado}</div>", unsafe_allow_html=True)
# ── Relatório ) ──────────
if analisar and img_bgr is not None and "is_fake" in dir() and is_fake and "zones" in dir() and zones:
st.markdown("<hr style='border:1px solid #334155;margin:2rem 0;'>", unsafe_allow_html=True)
st.markdown("### 📋 Relatório ")
with st.spinner("A gerar relatório ..."):
orchestrator = ForensicVLMOrchestrator(mode="api")
global_bbox = (
min(z.bbox[0] for z in zones), min(z.bbox[1] for z in zones),
max(z.bbox[2] for z in zones), max(z.bbox[3] for z in zones),
)
stream = orchestrator.generate_justification(
img_rgb=img_hires,
prob_final=prob_final,
prob_swin=prob_swin,
prob_clip=prob_clip_df40,
zone_name=", ".join(z.name for z in zones),
bbox=global_bbox,
)
ESTILO = ("background-color:#0f172a;padding:25px;border-radius:8px;"
"border-left:4px solid #FF0000;font-size:15px;color:#f8fafc;"
"line-height:1.7;box-shadow:0 4px 6px rgba(0,0,0,.2);margin-bottom:2rem;")
box = st.empty()
if isinstance(stream, str):
box.markdown(f"<div style='{ESTILO}'>{stream}</div>", unsafe_allow_html=True)
else:
acumulado = ""
for chunk in stream:
if chunk:
acumulado += chunk
box.markdown(f"<div style='{ESTILO}'>{acumulado} ▌</div>", unsafe_allow_html=True)
box.markdown(f"<div style='{ESTILO}'>{acumulado}</div>", unsafe_allow_html=True)
# ── Painel Técnico: Matemática Contrastiva ────────────────────────
if analisar and is_fake and st.session_state.get("contrastive_hm") is not None:
with st.expander("Visão Detalhada: Como a Anomalia é Isolada", expanded=False):
st.markdown("### Processo de Subtração Visual")
st.markdown("O sistema analisa a imagem através de duas 'lentes' diferentes: uma programada para detetar sinais de manipulação gerada por IA e outra para reconhecer padrões orgânicos de um rosto humano natural. Ao subtrair a componente natural, o ruído visual desaparece, destacando apenas as áreas manipuladas.")
st.markdown("<br>", unsafe_allow_html=True)
top_prompt = "AI face manipulation"
real_prompt = "real human face"
c1, cm, c2, ce, c3 = st.columns([1.5, .3, 1.5, .3, 1.5], vertical_alignment="center")
with c1:
st.markdown(render_heat_card(
visualize_heatmap(st.session_state["per_text_hm"][top_prompt]),
"Padrão Sintético", "Lente de Manipulação", "#ef4444"), unsafe_allow_html=True)
with cm:
st.markdown("<h1 style='text-align:center;color:#cbd5e1;'>-</h1>", unsafe_allow_html=True)
with c2:
if real_prompt in st.session_state["per_text_hm"]:
st.markdown(render_heat_card(
visualize_heatmap(st.session_state["per_text_hm"][real_prompt]),
"Padrão Orgânico", "Lente Natural", "#22c55e"), unsafe_allow_html=True)
with ce:
st.markdown("<h1 style='text-align:center;color:#cbd5e1;'>=</h1>", unsafe_allow_html=True)
with c3:
st.markdown(render_heat_card(
visualize_heatmap(st.session_state["contrastive_hm"]),
"Resultado Final", "Anomalia Destacada", "#3b82f6"), unsafe_allow_html=True)
if __name__ == "__main__":
main() |